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COMPONENTS
AIR-CLEANING
POWER PLANT

A N A S M E S TA N D A R D
UNITS AND
[Revision of ASME N509–1989 (R1997)]

NUCLEAR
ASME N509–2002
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NUCLEAR
AIR-CLEANING
POWER PLANT
UNITS AND
COMPONENTS
[Revision of ASME N509-2002 (R1997)]
ANSI / ASME N509-2002
S T A N D A R D
N A T I O N A L
A M E R I C A N
A N
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Date of Issuance: March 26, 2003

This Standard will be revised when the Society approves the issuance of a new edition. There will
be no addenda issued to this edition.

ASME issues written replies to inquiries concerning interpretations of technical aspects of this
Standard. Interpretations are published on the ASME Web site under the Committee Pages at http://
www.asme.org/codes/ as they are issued.

ASME is the registered trademark of The American Society of Mechanical Engineers.

This code or standard was developed under procedures accredited as meeting the criteria for American National
Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from
competent and concerned interests have had an opportunity to participate. The proposed code or standard was made
available for public review and comment that provides an opportunity for additional public input from industry, academia,
regulatory agencies, and the public-at-large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in connection with any
items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for
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ASME accepts responsibility for only those interpretations of this document issued in accordance with the established
ASME procedures and policies, which precludes the issuance of interpretations by individuals.

No part of this document may be reproduced in any form,

in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.

The American Society of Mechanical Engineers

Three Park Avenue, New York, NY 10016-5990

Copyright © 2003 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved
Printed in U.S.A.
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CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

4 Functional Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4.2 Design Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.3 Size (Installed Capacity) of Air-Cleaning Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.4 Environmental Design Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.5 Structural Load Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.6 Air-Cleaning Units and Components That Must Withstand Fan Peak
Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.7 Nuclear Air-Treatment System Configuration and Location . . . . . . . . . . . . . . 3
4.8 Maintainability Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.9 Monitoring of Operational Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.10 Adsorbent Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.11 Fire Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.12 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.13 Testability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.14 Pressure Boundary Leakage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

5 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1 HEPA Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2 Tray-Type Bed and Deep Bed Adsorber Cells . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.3 Prefilters and Postfilters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.4 Moisture Separators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.5 Air Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.6 Filter Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.7 Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.8 Fan Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.9 Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.10 Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 Packaging, Shipping, Receiving, Storage, and Handling of Components . . . . . . . . . . 6

7 Installation and Erection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

7.1 Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.2 Erection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.3 Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.4 Installation of HEPA Filters and Adsorbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

8 Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

9 Acceptance Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Mandatory Appendix
I Sampling of Installed Adsorbents for Surveillance Testing . . . . . . . . . . . . . . . . . . . . . . 9

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FOREWORD

This Standard covers requirements for the design, construction, and testing of units and
components which make up high efficiency air and gas cleaning systems used in nuclear power
plants. The standard was originally developed by the American National Standards Committee
N45 on Reactor Plants.
This Standard specifies acceptance testing, including minimum acceptance requirements, in
accordance with the standard prepared by the companion ad hoc working group, “Testing of
Nuclear Air Cleaning Systems.” It was originally approved on December 7, 1976 by the American
National Standards Institute and designated N509-1976.
In 1975, the N45.8 Subcommittee was reorganized into the ASME Committee on Nuclear Air
and Gas Treatment and began operating under the accredited ASME Procedures for Nuclear
Projects which received accreditation on January 15, 1976. The ASME Committee on Nuclear Air
and Gas Treatment was chartered to develop, review, maintain, and coordinate Codes and Stan-
dards for design, fabrication, installation, testing, and inspection of equipment for gas treatment
for nuclear power plants.
Suggestions for improvement gained in the use of this Standard will be welcomed. They should
be sent to the Secretary, Committee on Nuclear Air and Gas Treatment, The American Society
of Mechanical Engineers, Three Park Avenue, New York, NY 10016.
This Standard was approved by the ASME Committee on Nuclear Air and Gas Treatment and
approved as an American National Standard by the American National Standards Institute on
November 6, 2002.

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ASME COMMITTEE ON NUCLEAR AIR AND GAS TREATMENT
(The following is the roster of the Committee at the time of approval of this Standard.)

MAIN COMMITTEE
R. D. Porco, Chair
J. D. Paul, Vice Chair
C. A. Sanna, Secretary

COMMITTEE PERSONNEL
L. T. Ahlman, Raytheon M. L. Hyder, Consultant
R. R. Bellamy, U.S. Nuclear Regulatory Commission J. W. Jacox, JACOX Associates
J. R. Edwards, CSC/Flanders J. Kriskovich, Vista Engineering Technologies
M. W. First, Harvard School of Public Health M. E. Pest, PVNGS/APS
M. J. Fox, Engineered Environments, Inc. G. S. Petersen, Raytheon
C. Golden, Consultant R. D. Raheja, Sargnt & Lundy Engineering
C. E. Graves, NUCON International, Inc. C. A. Sanna, The American Society of Mechanical Engineers
M. R. Hargan, Hargan Engineering R. M. Van Becelaere, Ruskin Manufacturing Division
J. J. Hayes, Jr., U.S. Nuclear Regulatory Commission J. D. York, Jr., Consultant

CONAGT HONORARY
D. J. Gladden, Consultant
L. J. Klaes, Consultant
W. H. Miller, Sargent & Lundy, Inc.
S. C. Ornberg, Sargent & Lundy, Inc.

EXECUTIVE COMMITTEE
J. D. Paul, Chair J. L. Kovach, NUCON International
R. D. Porco, Vice Chair J. Kriskovich, Vista Engineering Technologies
C. A. Sanna, Secretary M. E. Pest, PVNGS/APS
C. Golden, Consultant T. J. Vogan, Sargent & Lundy Engineers
M. R. Hargan, Hargan Engineering

Special Working Group on Editorial Review

R. R. Bellamy, U.S. Nuclear Regulatory Commission W. J. McAndrews, RMRS
B. C. Elliot, Aerofin Corp. M. E. Saucier, SSM Industries, Inc.
M. W. First, Harvard School of Public Health A. Soma, Barnebey Sutcliffe
J. R. Hunt, NCS Corp. J. D. York, Jr., Ellis & Watts Co.
C. G. Kramer, Parsons Power Group

SUBCOMMITTEE ON VENTILATION AIR CLEANING EQUIPMENT

C. Golden, Chair S. Klocke, CSC/Flanders
J. R. Edwards, Vice Chair W. J. McAndrew, RMRS
D. G. Adams, ComEd H. A. Mearns, ECBC
R. R. Bellamy, U.S. Nuclear Regulatory Commission G. W. Moore, CSC/Flanders
M. C. Patel, TU-Comanche Peak
J. S. Boxall, Fairey Microfiltrex
C. I. Ricketts, New Mexico State University
M. A. Doersam, Ellis & Watts Co.
W. A. Rowan, U.S. Army, Edgewood
J. Fretthold, SSOC-Rocky Flats B. C. Seam, Bechtel National, Inc.
C. E. Graves, NUCON International, Inc. J. W. Slawski, U.S. Department of Energy
G. S. Grewal, Fluor Daniel, Inc. W. J. Ter Kuile, Vokes
J. J. Hayes, Jr., U.S. Nuclear Regulatory Commission L. D. Weber, Techmark Corp.
R. I. Heiden, U.S. Army Corps of Engineers M. B. Whitlock, Pall Corp.
M. L. Hyder, Consultant

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Subgroup on HEPA Filters
J. J. Hayes, Chair, U.S. Nuclear Regulatory Commission M. Pierce, Hollingsworth & Vose
W. H. Cambo, Lydall, Inc. G. G. Pyle, KAPL, Inc.
B. Franklin, AAF International C. I. Ricketts, New Mexico State University
J. Fretthold, SSOC-Rocky Flats R. C. Scripsick, University of California — LANL
G. S. Grewal, Fluor Daniel, Inc. B. C. Seam, Bechtel National Inc.
S. Klocke, CSC/Flanders J. W. Slawski, U.S. Department of Energy
W. J. McAndrews, RMRS W. J. Ter Kuile, Vokes
H. A. Mearns, ERDEC

Subgroup on Metal Filters

L. D. Weber, Chair, Techmark Corp. S. Klocke,, CSC/Flanders
J. S. Boxall, Fairey Microfiltrex W. J. McAndrew, RMRS
G. S. Grewal, Fluor Daniel, Inc. M. B. Whitlock, Pall Corp.

Subgroup on Special HEPA Filters (FK)

J. Fretthold, Chair, SSOC-Rocky Flats S. Klocke, CSC/Flanders
J. R. Blacklaw, Washington State Department of Health W. J. Ter Kuile, Vokes
B. Franklin, AAF International

Subgroup on Medium Efficiency Filters

M. C. Patel, Chair, Comanche Peak S. Klocke, CSC/Flanders
B. Franklin, AAF International W. J. McAndrew, RMRS
J. J. Hayes, Jr., U.S. Nuclear Regulatory Commission J. W. Slawski, U.S. Department of Energy

Subgroup on Low Efficiency Filters (FJ)

S. Klocke, Chair, CSC/Flanders B. Franklin, AAF International
D. Ghosh, Southern Co. Services, Inc. M. C. Patel, TU-Comanche Peak

Subgroup on Moisture Separators

J. Fretthold, Chair, SSOC/Rocky Flats
C. Golden, Consultant
W. J. McAndrews, RMRS
M. C. Patel, TU-Comanche Peak

Subgroup on Type III Adsorbers

C. E. Graves, Chair, NUCON International, Inc. W. J. McAndrews, RMRS
R. R. Bellamy, U.S. Nuclear Regulatory Commission M. C. Patel, TU-Comanche Peak
M. A. Doersam, Ellis & Watts Co. A. Soma, Barnebey Sutcliffe
C. Golden, Consultant

Subgroup on Adsorbent Media

R. R. Bellamy, Chair, U.S. Nuclear Regulatory Commission M. L. Hyder, Consultant
L. L. Dauber, U.S. Army, ERDEC H. A. Mearns, ERDEC
M. A. Doersam, Ellis & Watts, Co. R. W. Morrison, U.S. Army, ERDEC
J. R. Edwards, CSC/Flanders W. A. Rowan, U.S. Army, Edgewood
C. E. Graves, NUCON International, Inc. A. Soma, Barnebey Sutcliffe

Subgroup on Type II Adsorbers

C. E. Graves, Chair, NUCON International, Inc.
M. A. Doersam, Ellis & Watts Co.
M. C. Patel, TU-Comanche Peak

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Subgroup on Other Adsorbers
J. R. Edwards, Chair, CSC/Flanders M. L. Hyder, Consultant
J. R. Blacklaw, Washington State Department of Health S. Klocke, CSC/Flanders
M. A. Doersam, Ellis & Watts Co. A. Soma, Barnebey Sutcliffe

Subgroup on Mounting Frames

M. A. Doersam, Chair, Ellis & Watts Co.
C. Golden, Consultant
S. Klocke, CSC/Flanders

Subgroup on Gas Process Treatment Equipment

J. Kriskovich, Chair, Vista Engineering Technologies
M. J. Fox, Engineered Environments, Inc.

SUBCOMMITTEE ON COMMON EQUIPMENT

J. D. Paul, Chair, Westinghouse Savannah River Co. C. G. Kramer, Parsons Power Group, Inc.
S. M. Chan, Bechtel Power Corp. R. M. Van Becelaere, Ruskin Manufacturing Division

Subgroup on Dampers and Louvers

R. M. Van Becelaere, Chair, Ruskin Manufacturing Division R. A. Lichtenwald, Reed National Air Products Group
G. P. Brotherson, Consultant W. A. Pysh, Exitec Corp.

Subgroup on Ductwork
R. R. Campbell, Chair, Tennessee Valley Authority M. E. Saucier, SSM Industries, Inc.
L. Harrison, LM Idaho Technologies D. A. Studley, NUS Corp.
J. D. Paul, Westinghouse Savannah River Co.

Subgroup on Housing
M. A. Doersam, Ellis & Watts Co. J. D. Paul, Westinghouse Savannah River Co.
L. Harrison, LM Idaho Technologies D. R. Ramos, Parsons Power Group
S. Klocke, CSC/Flanders J. R. Roberts, Westinghouse Savannah River Co.
G. W. Moore, CSC/Flanders M. E. Saucier, SSM Industries, Inc.
P. S. Parthasarathy, Bechtel Power Corp. A. Soma, Barnebey Sutcliffe

Subgroup on Fans and Blowers

D. L. Davenport, EMC Engineers, Inc.
J. Vresk, Argonne National Laboratory

Subgroup on Instrumentation and Control

D. A. Brock, Southern Co. Services, Inc.
D. L. Davenport, EMC Engineers, Inc.
D. E. Grove, Bechtel Power Corp.

SUBCOMMITTEE ON VENTILATION AIR CONDITIONING EQUIPMENT

M. R. Hargan, Chair, Hargan Engineering B. C. Elliot, Aaerofin Corp.
G. S. Peterson, Vice Chair, Raytheon M. J. Fox, Engineered Environments, inc.
R. S. Brackett, ORNL S. A. George, Syska & Hennesy
L. W. Burgett, The Trane Co. D. Ghosh, Southern Co. Services, Inc.

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Subgroup on Refrigeration Equipment
P. H. Burwinkel, Chair, Southern Nuclear — Vogtle Plant M. J. Fox, Engineered Environments, Inc.
R. S. Brackett, ORNL D. Ghosh, Southern Co. Services, Inc.
L. W. Burgett, The Trane Co. G. S. Peterson, Raytheon
W. Clemenson, Consultant

Subgroup on Heating and Cooling Coils

M. R. Hargan, Chair, Hargan Engineering B. C. Elliot, Aerofin Corp.
P. H. Burwinkel, Southern Nuclear — Vogtle Plant M. J. Fox, Engineered Environments, Inc.

Subgroup on Electric Heaters

T. A. Meisner, Chair
R. N. Knoche, Consultant

SUBCOMMITTEE ON GENERAL SUPPORT SERVICES

T. J. Vogan, Chair, Sargent & Lundy Engineers J. B. Hayes, International Consulting
R. R. Raheja, Vice Chair, Sargent & Lundy Engineers W. F. Williams, Jr., TU Electric
J. D. York, Secretary, Ellis & Watts Co. J. Yang, Henan Nuclear Air Cleaning, Ltd.
B. Franklin, AAF International

Subgroup on General Requirements

J. D. York, Jr., Ellis & Watts Co.

Subgroup on Structural Design

R. D. Raheja, Chair, Sargent & Lundy Engineers
C. R. Hammond, LM Energy Systems
J. B. Hayes, International Consulting

SUBCOMMITTEE ON FIELD TESTING PROCEDURE

M. E. Pest, Chair, PVNGS/APS J. Fretthold, SSOC-Rocky Flats
J. R. Hunt, Vice Chair, NCS Corp. V. H. Kluge, APS Co. Palo Verde
E. M. Banks, NUCON International, Inc. L. Leonard, Leonard Designs
P. H. Burwinkel, Southern Nuclear — Vogtle Plant R. C. Scripsick, University of California — LANL
M. W. First, Harvard School of Public Health R. R. Sommer II, NUCON International, Inc.

SUBCOMMITTEE ON TECHNOLOGY
J. L. Kovach, Chair, NUCON International, Inc. J. W. Jacox, JACOX Associates
E. M. Banks, NUCON International, Inc. R. Zavadoski, DNFSB
M. W. First, Harvard School of Public Health

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ASME N509-2002

NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS

1 SCOPE ASME AG-1, Code on Nuclear Air and Gas Treatment1

This Standard covers requirements for the design, Publisher: The American Society of Mechanical Engi-
construction, and qualification and acceptance testing neers (ASME International), Three Park Avenue, New
of the air-cleaning units and components which make York, NY 10016; Order Department: 22 Law Drive,
up Engineered Safety Feature (ESF) and other high effi- Box 2300, Fairfield, NJ 07007-2300
ciency air and gas treatment systems used in nuclear
power plants.
3 TERMS AND DEFINITIONS
1.1 Limitations
Terms and Definitions are located in ASME AG-1,
The Standard does not cover sizing of a complete Article AA-1000 and various specific ASME AG-1 Code
nuclear air treatment system, redundancy, or single-fail- sections.
ure requirements. It applies only to systems which
employ particulate filtration, ambient-temperature
adsorption, or both, as the principal functional mecha- 4 FUNCTIONAL DESIGN
nism. It does not apply to condenser off-gas systems.
Also, it does not apply to other applications that employ 4.1 General
primarily gas storage or holdup, cryogenic adsorption Depending on the function of the system and the
or fractionation, or solvent absorption as the principal conditions under which it will operate, air-cleaning units
method of gas treatment. Nor does the Standard cover include some or all of the following internal components.
requirements for containment isolation valves, recom- (a) Prefilters are required in air-cleaning units when
biners, comfort heating, air-conditioning, or ventilation design inlet particulate concentrations and particle size
to achieve ordinary cooling or industrial hygiene objec- are such that the HEPA filter may be rendered ineffective
tives. Field acceptance testing of nuclear air-treatment prematurely. On other air-cleaning units prefilters are
systems is covered in ASME AG-1, Section TA (the pri- recommended only when it is desired to increase HEPA
mary reference was to ASME N510-1989). filter life.
1.2 Purpose (b) HEPA filters are required in all air-cleaning units
when filtration of inlet particulate matter requires a min-
The Standard identifies and establishes requirements
imum efficiency of 99.97% for particles equal to 0.3
for filters, adsorbers, moisture separators, air heaters,
micrometer in size.
filter housings, dampers, valves, fans, ducts, and other
components of nuclear air-treatment systems for a spe- (c) Adsorbers are required when air-cleaning units
cific application in a nuclear power plant. The Standard are designed for removal of adsorbable compounds.
also establishes requirements for operability, maintain- (d) Moisture separators (demisters) are required
ability, and testability of systems necessary for the main- when entrained water droplet concentration may be
tenance of system reliability for the design conditions. greater than 1 lb (0.45 kg) of water per 1,000 cfm (1,700
Qualification and acceptance testing provisions are spec- m3/hr) of airflow.
ified to verify the adequacy of the air-cleaning unit and (e) Heaters should be utilized for air-cleaning units
component design, to verify that components have been with adsorbers when the relative humidity of air to the
properly fabricated and installed, and that the system adsorber exceeds 70% based upon the 1% percentile
will perform in accordance with specification require- meteorological conditions (where applicable). For
ments. nuclear air-treatment systems which are unaffected by
outside air meteorological conditions, heaters should be
utilized when an accident would result in an airstream
2 APPLICABLE DOCUMENTS
exceeding 70% relative humidity for more than 1 hr.
The following documents supplement this Standard (f) Postfilters. When adsorbers are used in ESF air-
and are a part of it to the extent indicated in the text. cleaning units, provision shall be made for a postfilter
The issue of the referenced document noted below shall
be in effect. If no date is listed, then the issue of the
referenced document in effect at the time of the Purchase 1
ASME AG-1 contains Code requirements for nuclear air and
Order shall apply. gas treatment equipment. See Article AA-2000.

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ASME N509-2002 NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS

to retain carbon fines. Postfilters should also be consid- installed capacity of any bank or stage of components
ered in non-ESF air-cleaning units discharging into occu- should not exceed the number of components in the
pied spaces where carbon fine carryover is not bank times the rated capacity of the individual compo-
acceptable. nents. Test cannisters shall not be included in determin-
ing the installed capacity of any bank or stage of
4.2 Design Parameters adsorbers.
Values of the following design parameters shall be
specified when invoking this Standard and shall be used 4.4 Environmental Design Condition
wherever referenced: All parts and components of the air-cleaning unit shall
(a) volumetric air flow rate, acfm (m3/hr); be selected or designed to operate under the environ-
(1) minimum flow rate; mental conditions (temperature, relative humidity, pres-
(2) maximum flow rate; sure, radiation, etc.) specified in para. 4.2. Materials of
(3) design flow rate; construction and components shall be selected or treated
(b) design pressures, in. w.g. (Pa); to limit generation of combustibles and contaminants
(1) maximum operating pressure; and to resist corrosion and degradation that would result
(2) leak test pressure; in loss of function when exposed to the specified envi-
(3) maximum design pressure; ronmental conditions for the design life of the com-
(4) structural capability pressure (usually deter- ponent.
mined by component designer); Environmental qualification requirements are con-
(c) pressure-time transient (if applicable), in. w.g./sec tained in 10 CFR 50.49, IEEE 323 and ASME AG-1, Sec-
(Pa/sec); tion AA and various specific ASME AG-1 Code sections.
(d) maximum and minimum gas temperature, °F (°C)
and density, lb/ ft3 (kg/m3); 4.5 Structural Load Requirements
(e) maximum inlet relative humidity, %; ESF systems and all of their components shall be
(f) entrained liquid water, (mass flow rate), lb/min shown, either by testing or by a mathematical technique,
(kg/min); to remain functional under the structural loading speci-
(g) concentrations of specific contaminants in air- fied in ASME AG-1, Article AA-4000 and various specific
stream; ASME AG-I Code sections.
(h) required decontamination factors for each con-
taminant; 4.6 Air-Cleaning Units and Components That Must
(i) component radiation integrated life dose (rad) and Withstand Fan Peak Pressure
maximum dose rate (rad/hr); The maximum design pressure shall be documented
(j) maximum dirty filter pressure differential, in. by calculation, including the basis for the condition, and
w.g. (Pa); included in procurement specifications for manufactur-
(k) structural loadings; er’s design.
(l) duct and housing maximum permissible leak rate, (a) Positive Pressure. Air-cleaning units and compo-
scfin (m 3 /hr) and associated operating pressure, in. nents including ducts located on the discharge side of
w.g. (Pa); fan(s) which can be isolated by closure of a downstream
(m) environmental design conditions including tem- damper, or potentially plugged components, shall be
perature, pressure, and relative humidity; designed to withstand a positive internal pressure equal
(n) expected duration and environmental conditions to or greater than the peak pressure of the fan(s). If
of storage area; provision is made to deenergize fan(s) on high differen-
(o) particle size distribution and quantity of aerosols tial pressure or low flow, the components shall be
and contaminants under normal and accident conditions designed to withstand the trip point design pressure
(if known); plus a margin to include the rate of pressure rise between
(p) safety classification (ESF or non-ESF); reaching the pressure setpoint and the time for the
(q) number of adsorber test cannisters per adsorber instrumentation response, or 10%, whichever is greater.
bank; (b) Negative Pressure. Air-cleaning units and compo-
(r) heater capacity, watts, voltage, temperature differ- nents located on the inlet side of fan(s) which can be
ential, if applicable. isolated by closure of an upstream damper, or poten-
tially plugged components shall be designed to with-
4.3 Size (Installed Capacity) of Air-Cleaning Unit stand a negative internal pressure equal to or more
The installed capacity cfm (m3/hr) of the air cleaning negative than the peak pressure of the fan(s). If provision
unit shall be no greater than the limiting installed capac- is made to deenergize fan(s) on high differential pressure
ity of any bank of components contained in the air- or low flow, the components shall be designed to with-
cleaning unit through which the airflow must pass. The stand the trip point design pressure plus a margin to

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NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS ASME N509-2002

include the rate of pressure rise between reaching the (2) downstream of air-cleaning unit if air-cleaning
pressure setpoint and the time for the instrumentation unit is in a clean space.
response, or 10%, whichever is greater. (d) The length of positive pressure ducts outside of
the habitable boundary should be kept as short as practi-
4.7 Nuclear Air-Treatment System Configuration and cal to reduce effect of duct leakage on ability to pressur-
Location ize habitable boundary.
Physical location and arrangement of the components (e) Recirculating system housings should be kept at
of a nuclear air-treatment system influence the require- a positive pressure if located outside habitable boundary
ments for leak tightness for the various parts of the in a contaminated space or interspace.
pressure boundary. Air flow should be from potentially 4.7.3 Recirculating Nuclear Air-Treatment Systems
less contaminated areas to potentially more contami- (a) If an air-cleaning unit is located in a clean space
nated areas. Whenever possible, routing of contami- or interspace outside of the space served, the fan should
nated air through clean spaces or interspaces should be be located downstream of the air-cleaning unit.
avoided. If this can not be done, the general guidance
(b) Fans may be either upstream or downstream of air-
in this Section should be followed.
cleaning units if located totally within the space served.
Figures B-1410-1, B-1410-2, and B-1410-3 of ASME AG-
(c) The length of ductwork outside the space served
1, Section SA schematically depict examples of possible
should be kept as short as practical.
combinations and location of fan and air-cleaning unit
to minimize impact of system contaminated outleakage 4.8 Maintainability Criteria
on surrounding clean spaces and interspaces as well as
contaminated inleakage into a cleaner system com- 4.8.1 Access for Service, Testing, and Inspection. The
ponent. air-cleaning unit shall be designed to keep radiation
exposures during maintenance, testing, and inspection
4.7.1 Effluent Nuclear Air-Treatment System (Once- as low as reasonably achievable (ALARA). Some design
Through) features which contribute to keeping these exposures
(a) Maintain ducts conveying contaminated air ALARA are the following.
through clean spaces or clean interspaces at a negative (a) Man-entry air-cleaning units should be located at
pressure with respect to the surrounding areas. floor level or should be equipped with a permanent
(b) With air-cleaning unit located in a clean service gallery at least 4 ft (1.23 m) wide with permanent
interspace, locate exhaust fan downstream of air-clean- stairs or fixed ladders.
ing unit in order to keep air-cleaning unit under negative (b) Smaller air-cleaning units should be located at a
pressure. Any leakage through fan shaft will be from height above the floor or work gallery level convenient
clean interspace. for access, based on human factors and the design of
(c) When air-cleaning units are located in contami- the housing.
nated spaces or interspaces, the fan shall be located (c) The area in which the air-cleaning unit is located
upstream of the air-cleaning unit in order to keep air- shall be served by a clear aisle wide enough to accommo-
cleaning unit under positive pressure and to prevent date servicing of internal components and equipment.
infiltration of contaminated air through fan shaft, or (d) Sufficiently wide clear area adjacent to the housing
into the filter housing downstream of filters, thereby door or hatch shall be provided to allow servicing the
bypassing filters. air-cleaning unit; a space of at least 4 ft wide x 7 ft (1.23
(d) The length of positive pressure discharge ducts m wide x 2.15 m) high is recommended. The clear work
from the air-cleaning unit routed through clean spaces space may also serve as aisle space as long as it can be
or interspaces should be kept as short as practical to used while servicing the air-cleaning unit, or it may
minimize outleakage from ductwork from impacting in- serve as the clear space for an adjacent air-cleaning unit.
plant personnel exposure. (e) Clearance of 18 in. (0.46 m) is recommended above
4.7.2 Habitability Systems the housing for installation and inspection.
(a) Outside air ducts routed through clean spaces or (f) Elevated work galleries shall be designed in accor-
interspaces that may convey radioactive air following a dance with Occupational Safety and Health Act (OSHA)
release shall be under a negative pressure relative to the requirements.
spaces. (g) Ducts that are cleaned out periodically shall be
(b) Negative pressure recirculating air ducts that pass equipped with low leakage access hatches at strategic
outside the habitable space should be avoided or addi- points
tional filtration provided. 4.8.2 Internal Space for Maintainance. For ease of
(c) The makeup air fan shall be located: maintenance, air-cleaning unit design should provide
(1) upstream of air-cleaning unit if air-cleaning unit for a minimum of 3 ft (0.92 m) from mounting frame
is in a contaminated space; to mounting frame between banks of components. If

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ASME N509-2002 NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS

components are to be replaced between mounting be given to the type of carbon (or other media) utilized
frames, the bank-to-bank dimension should be the maxi- in adsorbers and the potential for fire.
mum deflated length of component plus a minimum of
4.11.5 Fire Protection Systems. Fire protection sys-
3 ft (0.92 m). The designer should consider susceptibility
tems, when provided, may use water deluge, inert gases
of permanently installed testing manifolds to damage
(e.g., halon, CO2) or other extinguishing agents as appro-
in determination of maintenance space. An extra 3 ft
priate for the hazard and designed in accordance with
(0.92 m) bank-to-bank spacing should be considered for
all applicable NFPA standards.
testing manifold clearance when manifolds are perma-
nently installed. 4.11.6 Water Deluge Systems. Deluge nozzles should
be permanently mounted within the housing and
4.9 Monitoring of Operational Variables located to ensure that both deep-seated or surface fires
Instruments and Controls shall meet the requirements can be extinguished. Nozzles shall be piped to an acces-
of ASME AG-1, Section IA. sible location outside the housing and provided with
redundant leak-tight isolation valves and a connection
4.10 Adsorbent Cooling suitable for manual attachment to the plant’s fire protec-
Where heat of radioactive decay or heat of oxidation tion system. Permanently connected fire protection sys-
or both may be significant, means shall be provided tems are not recommended, but may be used in lieu of
to remove this heat from the adsorbent beds to limit manual hose connections.
temperatures to values below 300°F (149°C) to prevent 4.11.7 Actuation of Fire Protection Systems. If the
significant iodine desorption. result of the fire hazard analysis requires that a fire
For this purpose, a minimum circulatory air flow shall protection system be provided for an air-cleaning unit,
be available for all operational modes of the air-cleaning the fire protection system should be manually actuated.
unit and shall be based on the maximum possible radio- Automatic actuating water deluge systems are not rec-
activity loading on the adsorbent beds. Water deluge ommended because spurious actuation of detection/
systems are not acceptable for this purpose. automatic protection systems will significantly degrade
4.11 Fire Protection adsorber capability and damage the adsorber.

4.11.1 General. Nuclear air-treatment systems shall 4.11.8 Permanently Connected Fire Protection Sys-
be designed, fabricated, and installed so as to minimize tem. If permanently connected fire protection systems
the use of combustibles. are installed, provision shall be made to activate an
Filter media, sealants, gaskets, and insulation shall alarm upon initiation of flow of extinguishing agent
meet the requirements in ASME AG-1. (e.g., water, halon, CO2).

4.11.2 Fire Detection. When adsorbers are provided, 4.11.9 Returning Air-Cleaning Unit to Service. If car-
a fire detection system shall be installed downstream of bon does become wet, the wet carbon shall be removed
each carbon adsorber bank to detect either abnormally from the adsorber as soon as practical to prevent struc-
elevated temperature or products of combustion. The tural damage to the adsorber due to chemical interaction.
fire detection system shall be designed to be responsive Before placing the air-cleaning unit back in service, the
to the unique features of the installation and application adsorber shall be thoroughly dried, visually inspected
(e.g., low air velocity, stratification). A two-stage alarm for corrosion damage, dried carbon shall be laboratory
shall be provided. The fire detection system shall operate tested per ASME AG-1, Section FF and adsorber leak
an alarm (first stage) upon detection of temperature testing shall be performed per ASME AG-1, Section TA.
above a prearranged setpoint and automatically trip 4.12 Insulation
fan(s) and isolate the air-cleaning unit. The second stage
shall operate an alarm when a fire is detected. Documen- Acoustic linings, thermal insulation, and similar
tation shall be provided to the owner which shows that materials shall not be applied to the inside of ducts and
the fire detection system is designed to be responsive housings. Materials applied to the outside of ducts and
to a fire within the carbon adsorber bed. housings shall not prevent access to any bolted construc-
tion joint, door, access hatch, or instrument in the hous-
4.11.3 Fire Hazard Procedures. Plant fire protection ing or ducting, or result in penetrations through the
procedures should include requirements that upon first- pressure boundary which would result in exceeding
stage, high-temperature alarm, the plant fire brigade is allowable leakage rates in accordance with para. 4.14.
dispatched to the area to take appropriate action.
4.13 Testability
4.11.4 Fire Hazard Analysis. A fire hazard analysis
shall be performed for all air-cleaning units and compo- (a) To ensure that the testing requirements of this
nents in accordance with 10 CFR 50 Appendix R and Standard can be met, sufficient permanently installed
NFPA 803, except that for adsorbers consideration shall halide and DOP injection and sampling ports shall be

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NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS ASME N509-2002

provided to permit accurate testing in accordance with (c) plant personnel exposure due to excessive system
ASME AG-1, Section TA. inleakage which prevents the nuclear air-treatment sys-
Where required for proper challenge agent mixing tem from performing its design function in contami-
and/or sampling, multiple inlet or outlet distribution nated spaces or contaminated interspaces during plant
manifolds shall be provided to allow injection and sam- normal, upset, or accident conditions;
pling per ASME AG-1, Section TA. (d) offsite exposure during plant normal, upset, or
(b) Sufficient test cannisters or other means of accident conditions.
obtaining samples (see Mandatory Appendix I) of used 4.14.2 Calculation of Allowable Leakage. The system
adsorbent shall be installed in the adsorber system to designer (Engineer) shall determine leakage criteria and
provide a representative determination of the response allowable leakage to meet governing Codes, Standards,
of the adsorbent to the service environment over the regulations, and plant-specific requirements for required
predicted life of the adsorbent. Test cannisters shall be portions of the nuclear air-treatment system pressure
installed in a location where they will be exposed to the boundary (ducts, housing, dampers, fans, etc.). The basis
same airflow conditions as the adsorbent in the system, for determining the leak rate, and coincident operating
shall have the same adsorbent bed-depth as the adsor- (static) pressure shall be documented and provided to
bent in the system, and shall be filled with representative the owner.
adsorbent from the same batch of adsorbent as that of Additional leakage criteria may be applied to the pres-
the system. sure boundary as determined by the owner to meet
The quantity of test cannisters to be provided shall plant-specific ALARA programs and/or regulatory
be based on the expected frequency of operation. For requirements.
continuously operating systems, where laboratory test- Additional leakage criteria can be found in nonman-
ing of carbon is required every 720 hr of operation, a datory Appendix SA-B of ASME AG-1, including exam-
minimum of 18 test cannisters is recommended. For ples of determining allowable leakage for typical
those systems where laboratory carbon testing is installations.
required once every 18 months, a minimum of 6 test
4.14.3 Leak Test Parameters. Components shall be
cannisters is recommended. If the adsorber operation
designed, fabricated, and installed to not exceed allow-
may vary from part time to continuous then classifying
able leakage at specified operating pressure. See non-
the adsorber as continuous is recommended.
mandatory Appendix SA-B of ASME AG-1.
The type of test cannister design (including connec-
tion to adsorber bank) shall be qualified by the manufac-
turer. Any change in the cannister design or mounting 5 COMPONENTS
to bank shall require a retest. The qualification test shall
measure air velocity at the test cannister. Measured 5.1 HEPA Filters
velocity shall be ±10% of adsorber bank design velocity. HEPA filters shall meet the requirements of ASME
Tests on each production air-cleaning unit are not AG-1, Section FC.
required.
(c) Access shall be provided between banks of compo- 5.2 Tray-Type Bed and Deep Bed Adsorber Cells
nents in the housing to permit physical inspection of Tray-type and deep bed adsorber cells shall meet the
both sides of each bank; components shall not be requirements for Type II or Type III cells, respectively,
installed back-to-back on the same or opposite sides of ASME AG-1, Sections FD, Type II Adsorbers, and FE,
of the same mounting frame, or on adjacent mounting Type III Adsorbers; and shall be filled with an adsorbent
frames which are so close as to not permit adequate which meets the requirements of ASME AG-1, Section
access space between banks. FF.

5.3 Prefilters and Postfilters

4.14 Pressure Boundary Leakage
Medium efficiency prefilters and postfilters shall meet
4.14.1 Maximum Allowable Leakage. Maximum the requirements of ASME AG-1, Section FB.
allowable leakage across the pressure boundary of any
portion of a nuclear air-treatment system shall be based 5.4 Moisture Separators
on health physics requirements. Leakage into or out of Moisture separators shall meet the requirements of
nuclear air treatment systems may affect: ASME AG-1, Section FA.
(a) control room habitability;
(b) plant personnel exposure during normal plant 5.5 Air Heaters
operation due to contaminated outleakage in clean Heaters shall meet the requirements of ASME AG-1,
spaces or clean interspaces; Section CA.

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ASME N509-2002 NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS

5.5.1 Heater Stage. The heater stage shall be sized differential pressure). The fan and system characteristic
on the basis of heat transfer calculations showing a capa- curves shall be included in the system documentation.
bility of reducing the maximum expected relative The fan shall be selected to operate on the stable portion
humidity of the entering airstream mixture to approxi- of its pressure curve under all operating conditions.
mately 70% in the housing space between the moisture Provision shall be made in the design to maintain stable
separator or housing inlet (whichever is applicable) and operation under the design flows and varying pressure
the refilter stage, at the system design flow rate. The range. Inlet vanes, inlet/outlet damper modulation,
sensible heat produced by the heater stage shall not variable speed fan control are acceptable alternatives.
result in increasing air temperatures to more than 225°F.
An overtemperature cutoff switch set at this value shall
5.8 Fan Drives
be provided. Manually reset overtemperature cutoff Fan drives shall meet the requirements of ASME AG-
switches are not recommended for ESF air-cleaning units 1, Section BA.
located in areas not accessible following a DBA. 5.8.1 Integral Horsepower Motors — General. Motors
5.5.2 Heaters for ESF Systems. Heaters in ESF air- shall comply with and be tested and rated in accordance
cleaning units shall be qualified to meet the requirements with applicable requirements of NEMA MG-1, and IEEE
of IEEE 323, IEEE 344, and ASME AG-1, Section CA. 112A. Performance shall be verified by either test or
certification as specified for each requirement. Rated
5.6 Filter Housing service factor shall be a minimum of 1.0 unless specified
otherwise.
Housing shall meet the requirements of ASME AG-
Motors shall be sized to supply maximum mechanical
1, Section HA.
load demand without exceeding the rated horsepower
5.7 Fans under all identified operating conditions and to produce
the required torque and acceleration as required by the
Fans shall meet the requirements of ASME AG-1, Sec- driven equipment under the most adverse voltage, fre-
tion BA. quency and conditions specified, and shall be designed
Fans shall be selected on the basis of detailed system for the starting sequence specified by the Engineer.
pressure loss calculations, and shall be capable of pro-
ducing the specified design flow rates. The system 5.8.2 Drives for ESF Systems. Drives in ESF systems
designer shall, in accordance with AMCA 201, prepare shall comply with IEEE 323. In addition, drives of ESF
a system characteristic curve for design and limiting systems located inside containment shall be qualified in
conditions under which the fans will be required to accordance with IEEE 334.
operate. ESF fan drives shall be qualified in accordance with
All resistances in the system, including clean and dirty IEEE 344. Motor supports and hangers shall be designed
component pressure drops (as well as test pressure dif- to withstand all seismic and operating loads with the
ferential), full-open and intermediate control damper motor in its normal operating orientation without
positions, duct inlet losses, and losses in ducts, housing impairment of operating characteristics.
inlets and outlets, and fan inlets and outlets shall be 5.9 Dampers
considered in the estimate of the system characteristics.
A set of constant speed fan performance curves, showing Dampers shall meet the requirements of ASME AG-
the static or total pressure, corresponding efficiency, 1, Section DA.
capacity, and brake horsepower shall be obtained from 5.10 Ducts
the fan manufacturer for each fan configuration. Fan
Ducts shall meet the requirement of ASME AG-1, Sec-
inlet and discharge configurations, or other system char-
tion SA.
acteristics, that would adversely alter the published fan
performance shall be avoided. Fan size shall be chosen
after performing an analysis of the system characteristic 6 PACKAGING, SHIPPING, RECEIVING, STORAGE,
and fan performance curves, considering all system fac- AND HANDLING OF COMPONENTS
tors including temperature, pressure, required airflow Packaging, shipping, receiving, storage, and handling
and, particularly for fans operating in post-accident pri- shall meet the requirements of ASME NQA-1; ASME
mary containment atmospheres, density and viscosity AG-1, Article AA-7000, and various specific ASME AG-
of the air or air-steam-entrained water mixture. 1 Code section.
Fan selection shall also allow for test conditions in
accordance with ASME AG-1, Section TA. The system
7 INSTALLATION AND ERECTION
designer shall identify the maximum allowable differen-
tial pressure for each filter bank plus a margin to accom- 7.1 Drawings
modate filter loading which may occur prior to the next Complete system layout drawings showing the loca-
surveillance (typically 25% of the coincident dirty filter tion of housings, ducts, fans, dampers, and the other

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NUCLEAR POWER PLANT AIR-CLEANING UNITS AND COMPONENTS ASME N509-2002

external components in each of three mutually perpen- installation. Clamping devices shall be in place and com-
dicular planes shall be prepared prior to the start of pletely tightened to produce the required gasket com-
erection. Drawings, shall show all connections, hangers, pression.
and anchors, the location and joint details for all welds, After filters and adsorbers are unpacked and opened
and the procedure specification for each weld. The lay- to the atmosphere, extreme care is required to ensure
out drawings shall reference dimension and shop draw- that degradation does not occur either from exposure
ings of components, as applicable. Layout shall be before loading or by system operation during testing,
checked for interferences with other items to be installed construction, repair, or plant modification. Prefilters and
in the area, and conflicts shall be resolved before instal- HEPAs are particularly vulnerable to degradation due
lation. to construction dust. If additional welding is required
on the filter housing after HEPA filters or adsorbent
7.2 Erection is installed, the HEPA filters and adsorbent must be
All ducts, housings, fans, dampers, hangers, anchors, removed before starting this work. HEPA filters are very
and services (electrical, steam, drains, etc.) shall be susceptible to pinholes from welding sparks. Carbon
installed in strict conformance with the layout drawings; adsorbent is aged or poisoned by trace concentrations
deviations of more than the design tolerance from the of vapors such as solvents, paint off-gassing, engine
location in any plane from the position shown in the exhaust and welding fumes, or by moisture conden-
drawings shall be approved by the system designer or sation.
other responsible Engineer, and shall be documented by
“as-built drawings.” Prefabricated duct subassemblies 8 QUALITY ASSURANCE
should be made as large as practicable to minimize field
joints and field welding. Housings shall not be used to The design organization, manufacturers of compo-
support other equipment of the facility for which it was nents, and constructors (including subcontractors) shall
not designed; field runs of pipe, duct, or conduit or other each establish and comply with a comprehensive quality
systems of the facility shall not be permitted to penetrate assurance program and plan which meets the require-
the housing. Internal components (filters, adsorbers, ments of ASME NQA-1.
etc.) shall not be installed until immediately before the
system is presented for testing, and shall not be removed 9 ACCEPTANCE TESTING
from their cartons or crates until they are ready to be
Acceptance testing shall be in accordance with ASME
installed. The recommendations for handling and instal-
AG-1, Section TA and operational testing shall be in
lation of HEPA filters given in ASME AG-1, Section FC
accordance with ASME N510. It is recommended that
shall be complied with.
prefilters be installed before fan is first turned on to
7.3 Welding protect filters and fans from construction debris, and
the system fan(s) should be operated for at least 25 hr
Welding procedures, welders, and welding operators before installation of HEPA filters and adsorbers to clean
shall be qualified in accordance with ASME AG-1. up the worst of construction dirt (artificial resistance
may have to be added during this operation to prevent
7.4 Installation of HEPA Filters and Adsorbers overloading of the fan motor). Prefilters may have to be
Installation personnel shall be instructed in the proper replaced after this evolution. For personnel protection,
handling of the HEPA filters and carbon cell adsorbers personnel should not enter housing until fan has oper-
prior to the installation and clamping of the filters. ated for a sufficient period of time to remove air entrain-
Components should not be removed from protective able debris. After installing the HEPA filters and
cartons, crates, pallets, or skids until immediately before adsorbers, the system heaters should be operated, where
they are to be installed. Each item should be checked provided, to reduce, if necessary, the relative humidity
for physical damage, or evidence of abuse. Replace or of the air prior to making tests on the adsorbers.
repair damaged items before use. The position and align- All dampers, valves, and controls shall be exercised
ment of foundations, anchors, hangers, ducts, housings, through their full operating range and shown to be in
dampers, fans, motors, and other components shall be good operating condition before the start of testing.
checked and their locations shall be within tolerance as After completion of acceptance testing, the system shall
shown on the drawings. Pleats of HEPA filters shall be be sealed and the fan controls locked out to protect
vertical, gaskets of HEPA filters and adsorbers shall be the components during the remainder of construction
securely affixed so that they are not displaced during operations at the site.

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ASME N509-2002

MANDATORY APPENDIX I
SAMPLING OF INSTALLED ADSORBENTS FOR
SURVEILLANCE TESTING

I1 SCOPE (c) adsorbent manufacturer and type

(d) installation date
Provision shall be made to periodically remove a rep-
resentative sample of adsorbent from an installed system (e) system where installed
for Surveillance Tests. The details of sampler design shall include a method
A representative sample is defined as one that has to ensure that no bypass will occur, that the sampler(s)
experienced flow within ±20% of the average flow of will be halide leak tested along with the main bank per
the system (as confirmed by testing per ASME AG-1, Section TA of ASME AG-1 as part of an integrated filter
Section TA). The detailed means to achieve this is left bank leak test, and that the flow path shall be sealed
to the designer of each system, but detailed supporting leaktight after the sampler is removed. Consideration
data (either theoretical or empirical) shall be presented should be given in the design to allow insertion of the
to substantiate that the flow is representative and the sampler into a laboratory test apparatus for determina-
sample is, therefore, representative of the entire tion of methyl iodide penetration without disturbing
adsorber bank. any of the adsorbent.

I3.2 Test Tray Assemblies

I2 DESIGN BASIS FOR SAMPLERS A test tray assembly is an adsorber cell modified to
For the sample to be representative, it shall have expe- provide for removal of a portion of the adsorbent (usu-
rienced the same exposure to all contaminants as the ally one-eighth) in a section without disturbing the
entire bed it represents. To accomplish this, it shall have remainder of the adsorbent. Its use is acceptable as an
experienced the same flow (±20%) during the same alternative to individual samplers described in Section
period. This criterion can be met only when the bed I3.1 of this Appendix for obtaining representative
depth and pressure drop through a sampler section are samples.
the same as through the main adsorber bank. All flow When a test tray assembly is removed, an entire sec-
restrictions must be taken into account when designing tion is emptied into a clean plastic container or bag,
a sampler. Pipe stubs, valves, unions, fittings, elbows, mixed to ensure uniformity, a sample taken, and the
nozzle effects, and similar items or effects add pressure section refilled with such makeup adsorbent as required.
drop to the flow path and tend to make a sampler non- This makeup carbon shall meet the same requirements
representative. This Standard does not restrict any spe- as the original adsorbent.
cific approach or hardware but stresses that the flow The section sampled shall be marked to indicate when
criterion for equal bed thickness must be met. a sample was taken and the section number and position
noted both in the field test report and permanent plant
records to ensure that this section is not used again.
I3 GENERAL TYPES OF SAMPLES (SAMPLERS) Each cover plate shall be permanently marked with
I3.1 Individual Samplers a unique identification symbol.
A special adsorbent sample holder should be Each test tray assembly shall have at least the follow-
designed to hold adsorbent for testing. It shall be the ing data attached:
same depth as the main bed, a minimum of 2 in. (5.08 (a) serial number
cm) in diameter and in the same orientation as the main (b) adsorbent lot and batch number
bed. If there is a guard bed it shall be duplicated for the (c) adsorbent manufacturer and type
sampler. (d) installation date
The sampler shall be filled with adsorbent from the (e) system
same lot and batch as the main bed.
Each sampler shall have at least the following data I3.3 Sampling by Adsorber Cell Removal
attached: As a further alternative, an entire adsorber cell or bed
(a) serial number may be removed to obtain a sample. It shall be emptied
(b) adsorbent lot and batch number into a clean plastic container or bag, the adsorbent mixed

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ASME N509-2002 MANDATORY APPENDIX I

to ensure uniformity, a sample taken, the cell refilled or will be taken from an area where flow is experienced
replaced. If the adsorber cell is refilled it shall be marked by the adsorbent. For systems where the adsorbent bed
as having been refilled and shall not be used for future thickness is greater than 2 in. (5.08 cm), the position
samples as they are not representative of the adsorbent where the slotted-tube sampler is inserted into the bed
in the rest of the bank. is important. When a single sample representative of
the entire bed is desired, the slotted-tube sampler should
I3.4 Slotted-Tube Sampling be inserted at an angle to pick up carbon from both the
For Type III adsorbers, where the adsorbent bed is inlet and outlet faces of the bed. No carbon should be
refilled in-place, a sample may be taken with a slotted- taken from areas of less than full flow. When separate
tube sampler if sufficient test cannisters are not available. samples form inlet and outlet faces are desired, sample
ASTM E 300 contains slotted-tube sampler details and positions should be noted and the separate samples
background. For systems where the adsorbent bed thick- should not be mixed. When separate samples are taken,
ness is 2 in. (5.08 cm) deep, insert the slotted-tube sam- it may be required to calculate a composite efficiency
pler into the bed far enough to ensure that the sample for the bed.

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