Regulatory Guide 3.45: Difference between revisions

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{{Adams
{{Adams
| number = ML12184A017
| number = ML122430316
| issue date = 11/30/1980
| issue date = 04/30/1989
| title = Nuclear Criticality Safety for Pipe Intersections Containing Aqueous Solutions of Enriched Uranyl Nitrate.
| title = Nuclear Criticality Safety for Steel-Pipe Intersections Containing Aqueous Solutions of Fissile Materials
| author name =  
| author name =  
| author affiliation = NRC/RES, NRC/OSD
| author affiliation = NRC/RES
| addressee name =  
| addressee name =  
| addressee affiliation =  
| addressee affiliation =  
Line 10: Line 10:
| license number =  
| license number =  
| contact person =  
| contact person =  
| case reference number = Task FP 925-5
| case reference number = CE 802-5
| document report number = RG-3.045
| document report number = RG 3.45, Rev. 1
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 2
| page count = 4
}}
}}
{{#Wiki_filter:November.
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                                U.S. NUCLEAR REGULATORY COMMISSION                                                                Revision 1 April 1989 REGULATORY GUIDE
                                OFFICE OF NUCLEAR REGULATORY RESEARCH
                                                            REGULATORY GUIDE 3.45 (Task CE 802-5)
                  NUCLEAR CRITICALITY SAFETY FOR STEEL-PIPE INTERSECTIONS CONTAINING
                                          AQUEOUS SOLUTIONS OF FISSILE MATERIALS


.1 B8 U.S. NUCLEAR REGULATORY
==A. INTRODUCTION==
COMMISSION
by the American National Standards Institute (ANSI)
REGULATORY
      Section 70.22, "Contents of Applications," of                          on April 3, 1987.
GUIDE'" OFFICE OF STANDARDS
DEVELOPMENT
REGULATORY
GUIDE 3.45 (Task FP 925-5)NUCLEAR CRITICALITY
SAFETY FOR PIPE INTERSECTIONS
CONTAINING
AQUEOUS SOLUTIONS
OF ENRICHED URANYL NITRATE


==A. INTRODUCTION==
10 CFR Part 70, "Domestic Licensing of Special Nu- ANSI/ANS-8.9-1987 provides specifications for clear Material," requires that applications for a spe- pipe intersections containing homogeneous aqueous cific license to own, acquire, deliver, receive, possess, solutions of fissile materials. All dimensions are inter- use, or transfer special nuclear material contain pro- preted as nominal values of schedule 10 or heavier posed procedures to avoid accidental conditions of standard steel pipe. Only single columns with inter- criticality. This regulatory guide provides guidance for sections are considered in the standard. For multiple complying with this portion of the Commission's regu- columns or columns in the vicinity of other fissile ma- lations by describing procedures acceptable to the terials and the influence of environmental factors, the NRC staff for the prevention of criticality accidents in standard requires that experimental data or validated the storage and processing of aqueous solutions of fis- computational techniques be used to determine the sile materials in steel-pipe intersections.
Section 70.22, "Contents of Applications," of 10 CFR Part 70,"Domestic Licensing of Special Nuclear Material," requires that applications for a specific license to own, acquire, deliver, receive, possess, use, or transfer special nuclear material con-tain proposed procedures to avoid accidental conditions of criticality.


This regulatory guide provides guidance for com-plying with this portion of the Commission's regulations by describing procedures acceptable to the NRC staff for the prevention of criticality accidents in the storage and process-ing of aqueous solutions of enriched uranyl nitrate in pipe intersections.
safe configuration. Criteria and data provided are Any information collection activities mentioned                        based on criticality experiments and validated calcu- in this regulatory guide are contained as requirements                      lations that are generally applicable to homogeneous in 10 CFR Part 70, which provides the regulatory ba-                         aqueous solutions of fissile materials. Specific infor- sis for this guide. The information collection require-                      mation is included on fissile solutions containing ura- ments in 10 CFR Part 70 have been cleared under                              nium enriched in the 235U or 233 U isotope or pluto- OMB Clearance No. 3150-0009.                                                nium and on uranium solutions having a 23U content not exceeding 5 weight-percent of the total uranium.


==B. DISCUSSION==
==B. DISCUSSION==
ANSI/ANS 8.9-1978, "Nuclear Criticality Safety Guide for Pipe Intersections Containing Aqueous Solutions of Enriched Uranyl Nitrate,"I
ANSI/ANS-8.9-1987, "Nuclear Criticality Safety                                      
was prepared by Subcommittee  
 
8, Fission-able Materials Outside Reactors, of the Standards Committee of the American Nuclear Society. ANSI/ANS 8.9-1978 was approved by the American National Standards Committee N 16, Nuclear Criticality Safety, in 1977 and subsequently by the American National Standards Institute (ANSI) on February 15, 1978.ANSI/ANS 8.9-1978 is applicable only to the storage and processing of homogeneous aqueous solutions of uranyl nitrate containing no more than 93.5 wt-% U-235 in intersecting pipe geometries consisting of single central columns with smaller intersecting arms. The standard presents tabulated maximum safe values, derived from an empirical model based on validated calculations and experimental data, for both the central column diameter and the total area of intersection of the arms with the column for conditions of partial and total reflection.
==C. REGULATORY POSITION==
Criteria for Steel-Pipe Intersections Containing Aque- ous Solutions of Fissile Material,"' was prepared by                               The nuclear criticality safety practices and guid- Subcommittee 8, Fissionable Materials Outside Reac-                          ance for calculating safe steel-pipe intersections for tors, of the Standards Committee of the American                             aqueous solutions of fissile materials contained in Nuclear Society. ANSI/ANS 8.9-1987 was approved                             ANSI/ANS-8.9-1987 provide procedures generally acceptable to the NRC staff for the prevention of
  'Copies may be obtained from the American Nuclear Society,                criticality accidents in the storage and processing of
555 N. Kensington Avenue, La Grange Park, IL 60525.                          aqueous solutions of fissile materials.


The standard also presents a general procedure to ascertain the safety of specific pipe intersections as well as guidance on model parameters and ICopies may be obtained from the American Nuclear Society, 555 North Kensington Avenue, La Grange Park, Illinois 60525.limitations.
USNRC REGUIATORY GUIDES                              The guides are Issued in the following ten broad divisions:
Regulatory Guides are Issued to describe and make available to the pub- lic methods acceptable to the NRC staff of implementing specific parts of the Commission's regulations, to delineate techniques used by the        1. Power Reactors                    6. Products staff in evaluating specific problems or postulated accidents, or to pro-  2. Research and Test Reactors        7. Transportation vide guidance to applicants. Regulatory Guides are not substitutes for      3. Fuels and Materials Facilities    8. Occupational Health regulations, and compliance with them is not required. Methods and          4. Environmental and Siting          9. Antitrust and Financial Review solutions different from those set out in the guides will be acceptable if  5. Materials and Plant Protection    10. General they provide a basis for the findings requisite to the Issuance or continu- ance of a permit or license by the Commission.


In intersecting pipe geometries where the model does not apply, e.g., multiple columns or columns in the vicinity of other fissionable materials, the standard requires that experimental data or validated computational techniques be used to determine the safe configuration.
Copies of issued guides may be purchased from the Government Printing This guide was issued after consideration of comments received from        Office at the current GPO price. Information on current GPO prices may the public. Comments and suggestions for improvements in these              be obtained by contacting the Superintendent of Documents, U.S.


C. REGULATORY
guides are encouraged at all times, and guides will be revised, as ap-     Government Printing Office, Post Office Box 37082, Washington, DC
POSITION The nuclear criticality safety practices and guidance for calculating safe pipe intersections for enriched uranyl nitrate solutions contained in ANSI/ANS 8.9-1978 provide procedures generally acceptable to the NRC staff for the prevention of criticality accidents in the storage and processing of aqueous solutions of enriched uranyl nitrate in pipe intersections.
propriate, to accommodate comments and to reflect new information or        20013-70B2, telephone (202)275-2060 or (202)275-2171.


Section 6 of ANSI/ANS 8.9-1978 lists additional documents referred to in the standard.
experience.


The specific applicability or acept-ability of two of these listed documents has been addressed in the latest version of the regulatory guides identified below: Standard'ANSI N16.1-1975 ANSI N16.9-1975 Regulatory Guide 3.4 3.41
Written comments may be submitted to the Regulatory Publications            Issued guides may also be purchased from the National Technical Infor- Branch, DFIPS, ARM, U.S. Nuclear Regulatory Commission, Washing-           mation Service on a standing order basis. Details on this service may be ton, DC 20555.                                                             obtained by writing NTIS, 5285 Port Royal Road, Springfield, VA 22161.


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
The purpose of this section is to provide information to applicants regarding the NRC staff's plan for using this regulatory guide.The methods described in this guide were applied in a unnber of specific cases during reviews and selected licensing actions.These methods reflect the latest general NRC approach to criticality safety in the storage and processing of aqueous solu-tions of enriched uranyl nitrate in pipe intersections.
pipe intersections. Therefore, except in those cases in The purpose of this section is to provide informa-        which the applicant proposes an acceptable alterna- tion to applicants regarding the NRC staff's plan for         tive method for complying with the specified portions using this regulatory guide.                                  of the Commission's regulations, the method de- These methods reflect the latest general NRC ap-          scribed here will be used in the evaluation of submit- proach to criticality safety in the storage and process-      tals for license applications submitted pursuant to ing of aqueous solutions of fissile materials in steel-       10 CFR Part 70.
 
There-fore, except in those cases in which the applicant proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described herein will be used in the evaluation of submittals for license applications submitted pursuant to 10 CFR Part 7
 
===0. USNRC REGULATORY ===
GUIDES Comments should be sent to the Secretary of the Commission, U.S. Nuclear Regulatory Commission Washington, D.C. 20555, Regulatory Guides are Issued to describe and make available to the Attention:
Docketing and Service Branch.Public methods acceptable to the NRC staff of Implementing specific parts of the Commission's regulations, to delineate tech. The guides are Issued In the following ten broad divisions:
niques used by the staff In evaluating specific problems or postu-lated accidents, or to provide guidance to applicants.
 
Regulatory
1. Power Reactors 6. Products Guides are not substitutes for regulations, and compliance with 2. Research and Test Reactors 7. Transportation them Is not required.
 
Methods and solutions different from those set 3. Fuels and Materials Facilities
8. Occupational Health out In the guides will be acceptable If they Provide a basis for the 4. Environmental and Siting 9. Antitrust and Financial Review findings requisite to the issuance or continuance of a permit or 5. Materials and Plant Protection
10. General license by the Commission.
 
Copies of Issued guides may be Purchased at the current Government Comments and suggestions for Improvements in these guides are Printing Office price. A subscription service for future guldes In ap-encouraged at all times, and guides will be revised, as appropriate, cific divisions Is available through the Government Prnting Office.to accommodate comments and to reflect new information or Information on the subscription service and current GPO Prices may experience.


This guide was revised as a result of substantive com- be obtained by writing the U.S. Nuclear Regulatory Commission, ments received from the public and additional staff review. Washington, D.C. 20555, Attention:
3.45-2
Publications Sales Manager.


VALUE/IMPACT  
VALUE/IMPACT STATEMENT
STATEMENT*
    A draft value/impact statement was published        for the final guide has not been prepared. A copy of with the proposed Revision 1 to Regulatory Guide          the draft value/impact statement is available for in-
Regulatory Guide 3.45 (Task FP 925-5) endorses ANSI/ANS 8.9-1978, "Nuclear Criticality Safety Guide for Pipe Intersections Containing Aqueous Solutions of Enriched Uranyl Nitrate," which was approved by the American National Standards Institute on February 15, 1978. The A copy of the draft value/impact statement (published with Draft Guide FP 92$-5 in January 1980) is available for public inspection at 1717 H Street NW., Washington, D.C.nuclear criticality safety practices and guidance for calcula-ting safe pipe intersections contained in ANSI/ANS 8.9-1978 are acceptable to the NRC staff and to industry.
3.45 (Task CE 802-5) when the draft guide was pub-        spection and copying for a fee at the Commission's lished for public comment in May 1988. No changes        Public Document Room at 2120 L Street NW., Wash- were necessary, so a separate value/impact statement      ington, DC, under Task CE 802-5.


The guide provides a convenient reference for the licensee or license applicant in designing nuclear criticality safety programs to meet regulatory requirements and standards of good nuclear criticality safety practice.
3.45-3


The use of this guide should facilitate the licensing process with minimum impact on the NRC staff and industry.4 at Zt (U z 2 u~ 0 00 L)-00 44 -4 U 0 LU z LU..4 z rL)L a- z zL", Z L-40Z W 0 0-" >00 <~0 W l LL-C.,~z 00' C 0.- 0_tb- "0w 0 3.45-2}}
UNITED STATES              FIRST CLASS MAIL
NUCLEAR REGULATORY COMMISSION      POSTAGE b FEES PAID
                                          USNRC
    WASHINGTON, D.C. 20555 PERMIT No. G,67 OFFICIAL BUSINESS
    PENALTY FOR PRIVATE USE, $300}}


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Latest revision as of 00:13, 12 November 2019

Nuclear Criticality Safety for Steel-Pipe Intersections Containing Aqueous Solutions of Fissile Materials
ML122430316
Person / Time
Issue date: 04/30/1989
From:
Office of Nuclear Regulatory Research
To:
References
CE 802-5 RG 3.45, Rev. 1
Download: ML122430316 (4)


r"~

Z ~, .-  %- (

U.S. NUCLEAR REGULATORY COMMISSION Revision 1 April 1989 REGULATORY GUIDE

OFFICE OF NUCLEAR REGULATORY RESEARCH

REGULATORY GUIDE 3.45 (Task CE 802-5)

NUCLEAR CRITICALITY SAFETY FOR STEEL-PIPE INTERSECTIONS CONTAINING

AQUEOUS SOLUTIONS OF FISSILE MATERIALS

A. INTRODUCTION

by the American National Standards Institute (ANSI)

Section 70.22, "Contents of Applications," of on April 3, 1987.

10 CFR Part 70, "Domestic Licensing of Special Nu- ANSI/ANS-8.9-1987 provides specifications for clear Material," requires that applications for a spe- pipe intersections containing homogeneous aqueous cific license to own, acquire, deliver, receive, possess, solutions of fissile materials. All dimensions are inter- use, or transfer special nuclear material contain pro- preted as nominal values of schedule 10 or heavier posed procedures to avoid accidental conditions of standard steel pipe. Only single columns with inter- criticality. This regulatory guide provides guidance for sections are considered in the standard. For multiple complying with this portion of the Commission's regu- columns or columns in the vicinity of other fissile ma- lations by describing procedures acceptable to the terials and the influence of environmental factors, the NRC staff for the prevention of criticality accidents in standard requires that experimental data or validated the storage and processing of aqueous solutions of fis- computational techniques be used to determine the sile materials in steel-pipe intersections.

safe configuration. Criteria and data provided are Any information collection activities mentioned based on criticality experiments and validated calcu- in this regulatory guide are contained as requirements lations that are generally applicable to homogeneous in 10 CFR Part 70, which provides the regulatory ba- aqueous solutions of fissile materials. Specific infor- sis for this guide. The information collection require- mation is included on fissile solutions containing ura- ments in 10 CFR Part 70 have been cleared under nium enriched in the 235U or 233 U isotope or pluto- OMB Clearance No. 3150-0009. nium and on uranium solutions having a 23U content not exceeding 5 weight-percent of the total uranium.

B. DISCUSSION

ANSI/ANS-8.9-1987, "Nuclear Criticality Safety

C. REGULATORY POSITION

Criteria for Steel-Pipe Intersections Containing Aque- ous Solutions of Fissile Material,"' was prepared by The nuclear criticality safety practices and guid- Subcommittee 8, Fissionable Materials Outside Reac- ance for calculating safe steel-pipe intersections for tors, of the Standards Committee of the American aqueous solutions of fissile materials contained in Nuclear Society. ANSI/ANS 8.9-1987 was approved ANSI/ANS-8.9-1987 provide procedures generally acceptable to the NRC staff for the prevention of

'Copies may be obtained from the American Nuclear Society, criticality accidents in the storage and processing of

555 N. Kensington Avenue, La Grange Park, IL 60525. aqueous solutions of fissile materials.

USNRC REGUIATORY GUIDES The guides are Issued in the following ten broad divisions:

Regulatory Guides are Issued to describe and make available to the pub- lic methods acceptable to the NRC staff of implementing specific parts of the Commission's regulations, to delineate techniques used by the 1. Power Reactors 6. Products staff in evaluating specific problems or postulated accidents, or to pro- 2. Research and Test Reactors 7. Transportation vide guidance to applicants. Regulatory Guides are not substitutes for 3. Fuels and Materials Facilities 8. Occupational Health regulations, and compliance with them is not required. Methods and 4. Environmental and Siting 9. Antitrust and Financial Review solutions different from those set out in the guides will be acceptable if 5. Materials and Plant Protection 10. General they provide a basis for the findings requisite to the Issuance or continu- ance of a permit or license by the Commission.

Copies of issued guides may be purchased from the Government Printing This guide was issued after consideration of comments received from Office at the current GPO price. Information on current GPO prices may the public. Comments and suggestions for improvements in these be obtained by contacting the Superintendent of Documents, U.S.

guides are encouraged at all times, and guides will be revised, as ap- Government Printing Office, Post Office Box 37082, Washington, DC

propriate, to accommodate comments and to reflect new information or 20013-70B2, telephone (202)275-2060 or (202)275-2171.

experience.

Written comments may be submitted to the Regulatory Publications Issued guides may also be purchased from the National Technical Infor- Branch, DFIPS, ARM, U.S. Nuclear Regulatory Commission, Washing- mation Service on a standing order basis. Details on this service may be ton, DC 20555. obtained by writing NTIS, 5285 Port Royal Road, Springfield, VA 22161.

D. IMPLEMENTATION

pipe intersections. Therefore, except in those cases in The purpose of this section is to provide informa- which the applicant proposes an acceptable alterna- tion to applicants regarding the NRC staff's plan for tive method for complying with the specified portions using this regulatory guide. of the Commission's regulations, the method de- These methods reflect the latest general NRC ap- scribed here will be used in the evaluation of submit- proach to criticality safety in the storage and process- tals for license applications submitted pursuant to ing of aqueous solutions of fissile materials in steel- 10 CFR Part 70.

3.45-2

VALUE/IMPACT STATEMENT

A draft value/impact statement was published for the final guide has not been prepared. A copy of with the proposed Revision 1 to Regulatory Guide the draft value/impact statement is available for in-

3.45 (Task CE 802-5) when the draft guide was pub- spection and copying for a fee at the Commission's lished for public comment in May 1988. No changes Public Document Room at 2120 L Street NW., Wash- were necessary, so a separate value/impact statement ington, DC, under Task CE 802-5.

3.45-3

UNITED STATES FIRST CLASS MAIL

NUCLEAR REGULATORY COMMISSION POSTAGE b FEES PAID

USNRC

WASHINGTON, D.C. 20555 PERMIT No. G,67 OFFICIAL BUSINESS

PENALTY FOR PRIVATE USE, $300