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{{Adams
{{Adams
| number = ML003739416
| number = ML13038A433
| issue date = 04/30/1979
| issue date = 04/30/1979
| title = Nuclear Criticality Safety in Storage of Fissile Materials (Withdrawn 8/1998)
| title = Nuclear Criticality Safety in the Storage of Fissile Materials
| author name =  
| author name =  
| author affiliation = NRC/RES
| author affiliation = NRC/OSD, NRC/RES
| addressee name =  
| addressee name =  
| addressee affiliation =  
| addressee affiliation =  
Line 10: Line 10:
| license number =  
| license number =  
| contact person =  
| contact person =  
| document report number = RG-3.43 Rev 1
| document report number = RG-3.043, Rev. 1
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 2
| page count = 2
}}
}}
{{#Wiki_filter:Reylalon 1 April 1979 U.S. NUCLEAR REGULATORY  
{{#Wiki_filter:Revision 1 U.S. NUCLEAR REGULATORY COMMISSION                                                                                 April    1979 REGULATORY GUIDE
COMMISSION
                              OFFICE OF STANDARDS DEVELOPMENT
REGULATORY  
                                                                REGULATORY GUIDE 3.43 NUCLEAR CRITICALITY SAFETY IN THE STORAGE
GUIDE OFFICE OF STANDARDS  
                                                            OF FISSILE MATERIALS
DEVELOPMENT  
REGULATORY  
GUIDE 3A3 NUCLEAR CRITICALITY  
SAFETY IN THE STORAGE OF FISSILE MATERIALS  


==A. INTRODUCTION==
==A. INTRODUCTION==
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 contain proposed procedures to avoid accidental conditions of criticality.
of each storage cell and of the storage array.


This regulatory guide provides guidance for complying with this portion of the Commission's regulations by describing procedures accept able to the NRC staff for the prevention of criticality accidents in the storage of fissile materials outside nuclear. reactors.
These tabulated values do not include the Section 70.22, "Contents of Applications," of                                effects of moderation by hydrogenous materials
10 CFR Part. 70, "Domestic Licensing of Special                                  contiguous to the fissile materials. Evaluation Nuclear Material," requires that applications                                    of these effects by use of a validated computa- for a specific license to own, acquire, deliver,                                  tional technique is recommended in the stand- receive, possess, use, or transfer special                                        ard. The standard also presents guidance on nuclear material contain proposed procedures                                      reduction factors to be applied to the tabulated to avoid accidental' conditions of criticality.                                  mass limits to account for the effects of posi- This regulatory guide provides guidance for                                       tion and double batching of fissile material in a complying with this portion of the Commission's                                   storage cell, the reflecting properties of con- regulations by describing procedures accept-                                      crete or other masonry construction materials able to the NRC staff for the prevention of                                       used in the storage facility, and the proximity criticality accidents in the storage of fissile                                   of individual storage arrays.


==B. DISCUSSION==
materials outside nuclear reactors.
ANSI N16.5-1975, "'Guide for Nuclear Criti cality Safety in the Storage of Fissile Mate rial,"' was prepared by Subcommittee
8, Fis sionable Materials Outside Reactors, of the Standards Committee of the American Nuclear Society. ANSI N16.5-1975 was approved by the American National Standards Committee N16, Nuclear Criticality Safety, in 1974 and sub sequently by the American National Standards Institute (ANSI) on April 12, 1975.  ANSI N16.5-1975 is applicable to the storage of fissile materials as metals and oxides. Its applicability is limited to 100 wt-% U-233, ura nium containing more than 30 wt-% U-235, and plutonium containing more than 80 wt-% Pu-239 (all percentages based on metal content only).  The standard presents tabulated mass limits of these fissile materials in storage cells of idealized water-reflected storage arrays.  Caution in the use of the tabulated values in the standard is advised to ensure subcriticality
*Lines indicate substantive changes from previous issue.  'Copies may be obtained from the American Nuclear Society, '555 North Kensington Avenue, La Grange Park, Illinois 605g.of each storage cell and of the storage array.  These tabulated values do. not include the effects of moderation by hydrogenous materials contiguous to the fissile materials.


Evaluation of these effects by use of a validated computa tional technique is recommended in the stand ard. The standard also presents guidance on reduction factors to be applied to the tabulated mass limits to account for the effects of posi tion and double batching of fissile material in a storage cell, the reflecting properties of con crete or other masonry construction materials used in the storage facility, and the proximity of individual storage arrays.  C. REGULATORY  
==C. REGULATORY POSITION==
POSITION The nuclear criticality safety practices, limits, and conditions for the storage of fissile material and the guidance for other storage configurations contained in ANSI N16.5-1975 provide procedures generally acceptable to the NRC staff for the prevention of criticality accidents in the storage of fissile materials out side nuclear reactors subject to the following:
1. Use of ANSI N16.5-1975 is not a sub stitute for detailed nuclear criticality safety analyses for specific storage arrangements for fissile materials.


2. The mass limits tabulated in the standard that are marked by a superscript "a" to show that they exceed 90 percent of the critical mass of a water-reflected sphere should not be used unless it can be demonstrated that their use could not result in criticality under conditions involving errors or accidents such as double batching or water immersion.
==B. DISCUSSION==
The nuclear criticality safety practices, ANSI N16.5-1975, "Guide for Nuclear Criti-                                  limits, and conditions for the storage of fissile cality Safety in the Storage of Fissile Mate-                                    material and the guidance for other storage rial, "' was prepared by Subcommittee 8, Fis-                                    configurations contained in ANSI N16.5-1975 sionable Materials Outside Reactors, of the                                      provide procedures generally acceptable to the Standards Committee of the American Nuclear                                      NRC staff for the prevention of criticality Society. ANSI N16.5-1975 was approved by the                                    accidents in the storage of fissile materials out- American National Standards Committee N16,                                      side nuclear reactors subject to the following:
Nuclear Criticality Safety, in 1974 and sub- sequently by the American National Standards                                        1. Use of ANSI N16.5-1975 is not a sub- Institute (ANSI) on April 12, 1975.                                              stitute for detailed nuclear criticality safety analyses for specific storage arrangements for ANSI N16.5-1975 is applicable to the storage                                fissile materials.


3. The tabulated masses in the standard are not acceptable without all of the appropriate adjustments called for by the standard.
of fissile materials as metals and oxides. Its applicability is limited to 100 wt-% U-233, ura-                                    2. The mass limits tabulated in the standard nium containing more than 30 wt-% U-235, and                                    that are marked by a superscript "a" to show plutonium containing more than 80 wt-% Pu-239                                    that they exceed 90 percent of the critical mass (all percentages based on metal content only).                                  of a water-reflected sphere should not be used The standard presents tabulated mass limits of                                  unless it can be demonstrated that their use these fissile materials in storage cells of                                     could not result in criticality under conditions idealized          water-reflected              storage          arrays.      involving errors or accidents such as double Caution in the use of the tabulated values in                                    batching or water immersion.


License applicants wanting to use the standard shoul
the standard is advised to ensure subcriticality                                    3. The tabulated masses in the standard are
    *Lines indicate substantive changes from previous issue.                    not acceptable without all of the appropriate
    'Copies may be obtained from the American Nuclear Society,                  adjustments called for by the standar


====d. USNRC REGULATORY ====
====d. License====
GUIDES Comments should be sent to the Secreay of the Commiusion, U.S. Nulea USNRCt REUATR G D dryCo Wson, Washington, D.C. 2050, Attention:  
"555 North Kensington Avenue, La Grange Park, Illinois 60525.                    applicants wanting to use the standard should, USNRC REGULATORY GUIDES                                     Corment ehouid be         .ntto the Secretary of the Cornmison, U.S. Nulear Regratory Commission, Waslhirton, D.C. 20, Attention: Docke                  an&W
Docketing and Regultotoy Guides er issued to descrbe end make avlisabie to the public Service Drench. nethods acceptable to the NRC staff of implementing specific parts of the Commission's reguations, to deineete techniques used by the staff in evslu- The guides re issued in the following ten broad divisions tgsp iproblems or postulated accidents, or to provide guidance to apicants.
Regulatory Guides ae ismued to decicdbe and mie avaisla          to the public  sevce Brench.


Regulatory Guides are not subetlutes for regul'ons and com- 1. Power Reactors 6. Products pliance with them is not required.
mnethods acceptable to the NAC staff of                        'pcfic
                                                            1:lse  pats of the Commissio's regulations, to delinetoe      n .M      d by the staff In owue-  The gurdes we issued in the followng tn broad divimione:
aling rod* pA    olsm o pIsswte    l    ad    I,    IpovMid to          guplden  to applicants Regulatory Guides we not .stitts        for regulaions and ccm-     1. Powe Reector                              6. Products pianc@ with them a not requied. Mehods and solutions dIffe t from thorn        2. Ieseh    end Tet Reactora                7. Tranaportation sat out in Oneguidee will be acceptable Nfthe provide a basis for the linmbg    3. Fusl and Matonals Facilities              8. Occupetional Health requioi to th osisance or continuance of a pani or                    e by tO  4. Enuonomeled        idtSin                9. Antitrust and Financial Review *
Cou on.                                                                        5. Materials and Plm Protection              10. General RequMs fto snle coapi of esued guides lwhtch rtsy be reproduced) or for conwtiento andl mjsetalaton tor iWromwernenl In fthse guides wreanorwaged at    pleosment on an autorneft distribution iet tor single. coie of future gide tirmes nd gAdes wl be rMd, l11                            I    napproprite, to accommodte conmmm        in FdM divisiorm ouid be mod. in wting to the U.S. Nuclear Roeglory end tloreflect no hnnetomon or We*n- This qgui              roed as a resu    Cosenuis*on,    Wseeingamn,    D.C.  20M,    Atterntion: Directm.  D    on  of of m*,eestiavs commem      receive from fth pubc end additional easff revLe.    Techncl Winf tion ad Document Contol.


Methods end solutions diffrent from those 2. Research and Test Reactors 7. Transportation set out In the guides will be acceptable if they provide s beasi for ft findings 3. Fuels and Materials Facilities
among other things, demonstrate that the re-            The methods described in this guide were quirements of paragraphs 5.3 through 5.6 of          applied in a number of specific cases during the standard have been met.                           reviews and selected licensing actions. These methods    reflect  the  latest  general NRC
8. occupational Health requisite to the Issuance or continuance of a permit or licen@e by the 4. Envivrnmental and Siting 9. Antitrust and Financial Review Commission.
  4.       Section 7 of ANSI N16.5-1975 lists addi- approach to criticality safety in the storage of tional documents referred to in the standard.        certain types of fissile material outside of The specific applicability or acceptability of       nuclear reactors. Therefore, except in those these          listed    documents  will be covered  cases in which the applicant proposes an separately in other regulatory guides, where          acceptable alternative method for complying appropriate.                                         with specified portions of the Commission's regulations, the method described herein is


& Materials and Plant Protection
==D. IMPLEMENTATION==
10. General Requests for single copies of issued guides lWhich may be reproduced)
being and will continue to be used in the evaluation of submittals for license applications The purpose of this section is to provide          submitted pursuant to 10 CFR Part 70 until information to applicants regarding the NRC          this guide is revised as a result of suggestions staff's plans for using this regulatory guide.       from the public or additional staff review.
or for Comments and suggestlons for inmproveifients in these guides are encouraged at placement on an automatic distribution list for Single copies of future guides all timeiw and guides will be revied, as approprlate, to accommodate comment in specific divisions should be made in writing to, the U.S. Nuclear RegulatorY
and to reflect w nw Information or experence.
 
This gulde w m id a a resuit Commission, Washington, D.C. 20655, Attention:
Director, Division of of substantive comments received from the public and additional staff review. Technical Information and Document Control.


among other things, demonstrate that the re quirements of paragraphs
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5.3 through 5.6 of the standard have been met.  4. Section 7 of ANSI N16.5-1975 lists addi tional documents referred to in the standard.
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The specific applicability or acceptability of these listed documents will be covered separately in other regulatory guides, where appropriate.
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==D. IMPLEMENTATION==
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Therefore, 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 is being and will continue to be used in the evaluation of submittals for license applications submitted pursuant to 10 CFR Part 70 until this guide is revised as a result of suggestions from the public or additional staff review.00.  -o o..  W Z Zat Zg I W0 z 0 Uw -,< I L 0~ (m 4 4n U; U U z 'O}}
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Latest revision as of 23:32, 4 November 2019

Nuclear Criticality Safety in the Storage of Fissile Materials
ML13038A433
Person / Time
Issue date: 04/30/1979
From:
NRC/OSD, Office of Nuclear Regulatory Research
To:
References
RG-3.043, Rev. 1
Download: ML13038A433 (2)
v • d • e


Revision 1 U.S. NUCLEAR REGULATORY COMMISSION April 1979 REGULATORY GUIDE

OFFICE OF STANDARDS DEVELOPMENT

REGULATORY GUIDE 3.43 NUCLEAR CRITICALITY SAFETY IN THE STORAGE

OF FISSILE MATERIALS

A. INTRODUCTION

of each storage cell and of the storage array.

These tabulated values do not include the Section 70.22, "Contents of Applications," of effects of moderation by hydrogenous materials

10 CFR Part. 70, "Domestic Licensing of Special contiguous to the fissile materials. Evaluation Nuclear Material," requires that applications of these effects by use of a validated computa- for a specific license to own, acquire, deliver, tional technique is recommended in the stand- receive, possess, use, or transfer special ard. The standard also presents guidance on nuclear material contain proposed procedures reduction factors to be applied to the tabulated to avoid accidental' conditions of criticality. mass limits to account for the effects of posi- This regulatory guide provides guidance for tion and double batching of fissile material in a complying with this portion of the Commission's storage cell, the reflecting properties of con- regulations by describing procedures accept- crete or other masonry construction materials able to the NRC staff for the prevention of used in the storage facility, and the proximity criticality accidents in the storage of fissile of individual storage arrays.

materials outside nuclear reactors.

C. REGULATORY POSITION

B. DISCUSSION

The nuclear criticality safety practices, ANSI N16.5-1975, "Guide for Nuclear Criti- limits, and conditions for the storage of fissile cality Safety in the Storage of Fissile Mate- material and the guidance for other storage rial, "' was prepared by Subcommittee 8, Fis- configurations contained in ANSI N16.5-1975 sionable Materials Outside Reactors, of the provide procedures generally acceptable to the Standards Committee of the American Nuclear NRC staff for the prevention of criticality Society. ANSI N16.5-1975 was approved by the accidents in the storage of fissile materials out- American National Standards Committee N16, side nuclear reactors subject to the following:

Nuclear Criticality Safety, in 1974 and sub- sequently by the American National Standards 1. Use of ANSI N16.5-1975 is not a sub- Institute (ANSI) on April 12, 1975. stitute for detailed nuclear criticality safety analyses for specific storage arrangements for ANSI N16.5-1975 is applicable to the storage fissile materials.

of fissile materials as metals and oxides. Its applicability is limited to 100 wt-% U-233, ura- 2. The mass limits tabulated in the standard nium containing more than 30 wt-% U-235, and that are marked by a superscript "a" to show plutonium containing more than 80 wt-% Pu-239 that they exceed 90 percent of the critical mass (all percentages based on metal content only). of a water-reflected sphere should not be used The standard presents tabulated mass limits of unless it can be demonstrated that their use these fissile materials in storage cells of could not result in criticality under conditions idealized water-reflected storage arrays. involving errors or accidents such as double Caution in the use of the tabulated values in batching or water immersion.

the standard is advised to ensure subcriticality 3. The tabulated masses in the standard are

  • Lines indicate substantive changes from previous issue. not acceptable without all of the appropriate

'Copies may be obtained from the American Nuclear Society, adjustments called for by the standar

d. License

"555 North Kensington Avenue, La Grange Park, Illinois 60525. applicants wanting to use the standard should, USNRC REGULATORY GUIDES Corment ehouid be .ntto the Secretary of the Cornmison, U.S. Nulear Regratory Commission, Waslhirton, D.C. 20, Attention: Docke an&W

Regulatory Guides ae ismued to decicdbe and mie avaisla to the public sevce Brench.

mnethods acceptable to the NAC staff of 'pcfic

1:lse pats of the Commissio's regulations, to delinetoe n .M d by the staff In owue- The gurdes we issued in the followng tn broad divimione:

aling rod* pA olsm o pIsswte l ad I, IpovMid to guplden to applicants Regulatory Guides we not .stitts for regulaions and ccm- 1. Powe Reector 6. Products pianc@ with them a not requied. Mehods and solutions dIffe t from thorn 2. Ieseh end Tet Reactora 7. Tranaportation sat out in Oneguidee will be acceptable Nfthe provide a basis for the linmbg 3. Fusl and Matonals Facilities 8. Occupetional Health requioi to th osisance or continuance of a pani or e by tO 4. Enuonomeled idtSin 9. Antitrust and Financial Review *

Cou on. 5. Materials and Plm Protection 10. General RequMs fto snle coapi of esued guides lwhtch rtsy be reproduced) or for conwtiento andl mjsetalaton tor iWromwernenl In fthse guides wreanorwaged at pleosment on an autorneft distribution iet tor single. coie of future gide tirmes nd gAdes wl be rMd, l11 I napproprite, to accommodte conmmm in FdM divisiorm ouid be mod. in wting to the U.S. Nuclear Roeglory end tloreflect no hnnetomon or We*n- This qgui roed as a resu Cosenuis*on, Wseeingamn, D.C. 20M, Atterntion: Directm. D on of of m*,eestiavs commem receive from fth pubc end additional easff revLe. Techncl Winf tion ad Document Contol.

among other things, demonstrate that the re- The methods described in this guide were quirements of paragraphs 5.3 through 5.6 of applied in a number of specific cases during the standard have been met. reviews and selected licensing actions. These methods reflect the latest general NRC

4. Section 7 of ANSI N16.5-1975 lists addi- approach to criticality safety in the storage of tional documents referred to in the standard. certain types of fissile material outside of The specific applicability or acceptability of nuclear reactors. Therefore, except in those these listed documents will be covered cases in which the applicant proposes an separately in other regulatory guides, where acceptable alternative method for complying appropriate. with specified portions of the Commission's regulations, the method described herein is

D. IMPLEMENTATION

being and will continue to be used in the evaluation of submittals for license applications The purpose of this section is to provide submitted pursuant to 10 CFR Part 70 until information to applicants regarding the NRC this guide is revised as a result of suggestions staff's plans for using this regulatory guide. from the public or additional staff review.

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