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{{#Wiki_filter:Revision 2September 1987U.S. NUCLEAR REGULATORY COMMISSIONREGULATORY GUIDEOFFICE OF NUCLEAR REGULATORY RESEARCHREGULATORY GUIDE 3.1(Task CE 602-4)USE OF BOROSILICATE-GLASS RASCHIG RINGS AS A NEUTRONABSORBER IN SOLUTIONS OF FISSILE MATERIALA. INTRODUCTIONSection 70.22, "Contents of Applications," of 10 CFRPart 70, "Domestic Licensing of Special Nuclear Material,"requires that applications for a specific license to own,acquire, deliver, receive, possess, use, or transfer specialnuclear material contain proposed procedures to avoidaccidental conditions of criticality. Procedures for thispurpose include incorporating neutron-absorbing materialsuch as boron in process equipment. This regulatory guideprovides guidance for complying with this portion of theCommission's regulations by describing procedures accept-able to the NRC staff for the prevention of criticalityaccidents by use of borosilicate-glass raschig rings as aneutron absorber in solutions of fissile material.Any information collection activities mentioned in thisregulatory guide are contained as requirements in 10 CFRPart 70, which provides the regulatory basis for this guide.The information collection requirements in 10 CFR Part 70have been cleared under OMB Clearance No. 3150-0009.B. DISCUSSIONANSI/ANS-8.5-1986, "Use of Borosilicate-Glass RaschigRings as a Neutron Absorber in Solutions of Fissile Mate-rial,"' is a revision of ANSI/ANS-8.5-1979 and was pre-pared by Subcommittee 8, Fissionable Materials OutsideReactors, of the Standards Committee of the AmericanNuclear Society. ANSI/ANS-8.5-1986 was approved by theAmerican National Standards Committee N16, NuclearCriticality Safety, in 1985 and by the American NationalStandards Institute (ANSI) on January 3, 1986.1Copies may be obtained from the American Nuclear Society,555 North Kensington Avenue, La Grange Park, Illinois 60525.ANSI/ANS-8.5-1986 provides guidance on the use ofborosilicate-glass raschig rings as a neutron absorber insolutions of fissile material. The standard applies to theuse of borosilicate-glass raschig rings for primary and forsecondary criticality control in solutions containing 235U,239Pu, and 233U. The chemical and physical environment,properties of the rings and packed vessels, maintenanceinspection procedures, and criticality operating limits arespecified in the standard.Maximum permissible concentrations of homogeneoussolutions of plutonium or of uranium in vessels of unlimitedsize packed with borosilicate-glass raschig rings are specifiedin the standard. The concentration of these solutions isexpressed as the mass of plutonium or of uranium perunit volume. The density of hydrogen in any solutioncannot be less than 75 g/liter nor greater than 115 g/liter.Limitations on the relative abundance of the variousisotopes of plutonium are imposed in the specificationsapplicable to plutonium solutions.. The concentrationsspecified for uranium enriched in 23sU apply regardless ofthe 235U enrichment content but with a limitation on the233U content. For solutions of uranium containing up to5.0 wt-% 235U and up to 0.01 wt-% 233U (see Table 12 onpage 8 of the standard), the maximum permissible solutionconcentration is unrestricted. The concentrations specifiedfor solutions of 233U also apply to mixtures of 233U andother uranium isotopes.C. REGULATORY POSITIONThe guidance contained in ANSI/ANS-8.5-1986 forthe use of borosilicate-glass raschig rings as a neutronabsorber in solutions of fissile material provides a procedure2412Note that in Tble 1 (314) on page 8 of the standard, 41Pu >Pu should read Pu > u4 PU.USNRC REGULATORY GUIDESRegulatory Guides are Issued to describe and make available to thepublic methods acceptable to the NRC staff of Implementingspecific parts of the Commission's regulations, to delineate tech-niques used by the staff In evaluating specific problems or postu-lated accidents or to provide guidance to applicants. RegulatoryGuides are not substitutes for regulations, and compliance withthem Is not required. Methods and solutions different from those setout In the guides will be acceptable If they provide a basis for thefindings requisite to the Issuance or continuance of a permit orlicense by the Commission. -This guide was Issued after consideration of comments received fromthe public. Comments and suggestions for Improvements In theseguides are encouraged at all times, and guides will be revised, asappropriate, to accommodate comments and to reflect new Informa-tion or experience.Written comments may be submitted to the Rules and ProceduresBranch, DRR ADM, U.S. Nuclear Regulatory Commission,Washington, D6 20555.The guides are Issued In the following ten broad divisions:1. Power Reactors 6. Products2. Research and Test Reactors 7. Transportation3. Fuels and Materials Facilities 8. Occupational Health4. Environmental and Siting 9. Antitrust and Financial Review5. Materials and Plant Protection 10. GeneralCopies of Issued guides may be purchased from the GovernmentPrinting Office at the current GPO price. Information on currentGPO prices may be obtained by contacting the Superintendent ofDocuments, U.S. Government Printing Office, Post Office Box37082, Washington, DC 20013-7082, telephone (202)275-2060 or(202)275-2171.Issued guides may also be purchased from the National TechnicalInformation Service on a standing order basis. Details on thisservice may be obtained by writing NTIS, 5285 Rort Royal Road,Springfield, VA 2216 generally acceptable to the NRC staff for the prevention ofaccidental conditions of criticality.Section 8.0 of ANSI/ANS-8.5-1986 lists additional docu-ments referred to in the standard. The specific applicabilityor acceptability of these listed documents will be coveredseparately in other regulatory guides, where appropriate.D. IMPLEMENTATIONThe purpose of this section is to provide information toapplicants regarding the NRC staff's plan for using thisregulatory guide.The methods described in this guide were applied in anumber of specific cases during reviews and selectedlicensing actions. These methods reflect the latest generalNRC approach to criticality safety in operations involvinguse of borosilicate-glass raschig rings as a neutron absorberin solutions of fissile material. Therefore, except in thosecases in which the applicant proposes an acceptable alter-native method for complying with specified portions ofthe Commission's regulations, the methods described inthis guide will be used in the evaluation of submittals inconnection with license applications submitted Uinder10 CFR Part 70.3.1-2 VALUE/IMPACT STATEMENTA draft value/impact statement was published with theoposed Revision 2 to Regulatory Guide 3.1 (Task CE602-4) when the draft guide was published for publiccomment in March 1987. No changes were necessary,so a separate value/impact statement for the finalguide has not been prepared. A copy of the draftvalue/impact statement is available for inspection andcopying for a fee at the Commission's Public DocumentRoom at 1717 H Street NW., Washington, DC, underTask CE 602-4.,.S. G.P.O. 1987-181-682:602123.1-3 UNITED STATESNUCLEAR REGULATORY COMMISSIONWASHINGTON, D.C. 20555FIRST CLASS MAILPOSTAGE It FEES PAIDUSNRCPERMIT No. G-67OFFICIAL BUSINESSPENALTY FOR PRIVATE USE, $300}}
{{#Wiki_filter:Revision 2 U.S. NUCLEAR REGULATORY COMMISSION                                                                    September 1987 REGULATORY GUIDE
                        OFFICE OF NUCLEAR REGULATORY RESEARCH
                                                        REGULATORY GUIDE 3.1 (Task CE 602-4)
                        USE OF BOROSILICATE-GLASS RASCHIG RINGS AS A NEUTRON
                                  ABSORBER IN SOLUTIONS OF FISSILE MATERIAL
 
==A. INTRODUCTION==
ANSI/ANS-8.5-1986 provides guidance on the use of borosilicate-glass raschig rings as a neutron absorber in Section 70.22, "Contents of Applications," of 10 CFR                solutions of fissile material. The standard applies to the Part 70, "Domestic Licensing of Special Nuclear Material,"             use of borosilicate-glass raschig rings for primary and for requires that applications for a specific license to own,               secondary
                                                                        2 39 criticality control in solutions containing 2 3 5 U,
acquire, deliver, receive, possess, use, or transfer special                  Pu, and 2 3 3 U. The chemical and physical environment, nuclear material contain proposed procedures to avoid                  properties of the rings and packed vessels, maintenance accidental conditions of criticality. Procedures for this              inspection procedures, and criticality operating limits are purpose include incorporating neutron-absorbing material                specified in the standard.
 
such as boron in process equipment. This regulatory guide provides guidance for complying with this portion of the                    Maximum permissible concentrations of homogeneous Commission's regulations by describing procedures accept-               solutions of plutonium or of uranium in vessels of unlimited able to the NRC staff for the prevention of criticality                size packed with borosilicate-glass raschig rings are specified accidents by use of borosilicate-glass raschig rings as a              in the standard. The concentration of these solutions is neutron absorber in solutions of fissile material.                     expressed as the mass of plutonium or of uranium per unit volume. The density of hydrogen in any solution Any information collection activities mentioned in this            cannot be less than 75 g/liter nor greater than 115 g/liter.
 
regulatory guide are contained as requirements in 10 CFR                Limitations on the relative abundance of the various Part 70, which provides the regulatory basis for this guide.           isotopes of plutonium are imposed in the specifications The information collection requirements in 10 CFR Part 70              applicable to plutonium solutions.. The concentrations have been cleared under OMB Clearance No. 3150-0009.                   specified for uranium enriched in 2 3 sU apply regardless of the 2 3 5 U enrichment content but with a limitation on the
                                                                        233
 
==B. DISCUSSION==
U content. For solutions of uranium containing up to
                                                                        5.0 wt-% 2 35 U and up to 0.01 wt-% 2 3 3 U (see Table 12 on ANSI/ANS-8.5-1986, "Use of Borosilicate-Glass Raschig              page 8 of the standard), the maximum permissible solution Rings as a Neutron Absorber in Solutions of Fissile Mate-             concentration is unrestricted. The concentrations specified rial,"' is a revision of ANSI/ANS-8.5-1979 and was pre-                 for solutions of 2 3 3 U also apply to mixtures of 2 3 3 U and pared by Subcommittee 8, Fissionable Materials Outside                  other uranium isotopes.
 
Reactors, of the Standards Committee of the American Nuclear Society. ANSI/ANS-8.5-1986 was approved by the                                   
 
==C. REGULATORY POSITION==
American National Standards Committee N16, Nuclear Criticality Safety, in 1985 and by the American National                      The guidance contained in ANSI/ANS-8.5-1986 for Standards Institute (ANSI) on January 3, 1986.                          the use of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material provides a procedure
    1Copies may be obtained from the American Nuclear Society,                                                  on page 8 of the standard, 41Pu >
                                                                          2 4 12Pu Note      in TblePu thatread should           1 >(3 1 4) PU.
 
u4
555 North Kensington Avenue, La Grange Park, Illinois 60525.
 
USNRC     REGULATORY GUIDES                            The guides are Issued In the following ten broad divisions:
Regulatory Guides are Issued to describe and make available to the public methods acceptable to the NRC staff of Implementing              1.  Power Reactors                    6.  Products specific parts of the Commission's regulations, to delineate tech-       2.  Research and Test Reactors          7. Transportation niques used by the staff In evaluating specific problems or postu-       3.  Fuels and Materials Facilities 8.      Occupational Health lated accidents or to provide guidance to applicants. Regulatory        4.  Environmental and Siting          9.  Antitrust and Financial Review Guides are not substitutes for regulations, and compliance with          5.  Materials and Plant Protection 10.    General them Is not required. Methods and solutions different from those set out In the guides will be acceptable If they provide a basis for the findings requisite to the Issuance or continuance of a permit or         Copies of Issued guides may be purchased from the Government license by the Commission.      -                                        Printing Office at the current GPO price. Information on current GPO prices may be obtained by contacting the Superintendent of This guide was Issued after consideration of comments received from      Documents, U.S. Government Printing Office, Post Office Box the public. Comments and suggestions for Improvements In these          37082, Washington, DC 20013-7082, telephone (202)275-2060 or guides are encouraged at all times, and guides will be revised, as      (202)275-2171.
 
appropriate, to accommodate comments and to reflect new Informa- tion or experience.
 
Issued guides may also be purchased from the National Technical Written comments may be submitted to the Rules and Procedures            Information Service on a standing order basis. Details on this Branch,    DRR ADM, U.S. Nuclear Regulatory Commission,                  service may be obtained by writing NTIS, 5285 Rort Royal Road, Washington, D6 20555.                                                    Springfield, VA 22161.
 
generally acceptable to the NRC staff for the prevention of            The methods described in this guide were applied in a accidental conditions of criticality.                               number of specific cases during reviews and selected licensing actions. These methods reflect the latest general Section 8.0 of ANSI/ANS-8.5-1986 lists additional docu-         NRC approach to criticality safety in operations involving ments referred to in the standard. The specific applicability      use of borosilicate-glass raschig rings as a neutron absorber or acceptability of these listed documents will be covered          in solutions of fissile material. Therefore, except in those separately in other regulatory guides, where appropriate.          cases in which the applicant proposes an acceptable alter- native method for complying with specified portions of
 
==D. IMPLEMENTATION==
the Commission's regulations, the methods described in The purpose of this section is to provide information to        this guide will be used in the evaluation of submittals in applicants regarding the NRC staff's plan for using this            connection with license applications submitted Uinder regulatory guide.                                                  10 CFR Part 70.
 
3.1-2
 
VALUE/IMPACT STATEMENT
    A draft value/impact statement was published with the      guide has not been prepared. A copy of the draft oposed Revision 2 to Regulatory Guide 3.1 (Task CE          value/impact statement is available for inspection and
602-4) when the draft guide was published for public            copying for a fee at the Commission's Public Document comment in March 1987. No changes were necessary,               Room at 1717 H Street NW., Washington, DC, under so a separate value/impact statement for the final              Task CE 602-4.
 
,.S. G.P.O. 1987-181-682:60212
                                                          3.1-3
 
UNITED STATES              FIRST CLASS MAIL
NUCLEAR REGULATORY COMMISSION      POSTAGE It 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 01:06, 12 November 2019

Use of Borosilicate-Glass Raschig Rings as a Neutron Absorber in Solutions of Fissile Material
ML12220A057
Person / Time
Issue date: 09/30/1987
From:
Office of Nuclear Regulatory Research
To:
References
CE 602-4 RG-3.001, Rev. 2
Download: ML12220A057 (4)


Revision 2 U.S. NUCLEAR REGULATORY COMMISSION September 1987 REGULATORY GUIDE

OFFICE OF NUCLEAR REGULATORY RESEARCH

REGULATORY GUIDE 3.1 (Task CE 602-4)

USE OF BOROSILICATE-GLASS RASCHIG RINGS AS A NEUTRON

ABSORBER IN SOLUTIONS OF FISSILE MATERIAL

A. INTRODUCTION

ANSI/ANS-8.5-1986 provides guidance on the use of borosilicate-glass raschig rings as a neutron absorber in Section 70.22, "Contents of Applications," of 10 CFR solutions of fissile material. The standard applies to the Part 70, "Domestic Licensing of Special Nuclear Material," use of borosilicate-glass raschig rings for primary and for requires that applications for a specific license to own, secondary

2 39 criticality control in solutions containing 2 3 5 U,

acquire, deliver, receive, possess, use, or transfer special Pu, and 2 3 3 U. The chemical and physical environment, nuclear material contain proposed procedures to avoid properties of the rings and packed vessels, maintenance accidental conditions of criticality. Procedures for this inspection procedures, and criticality operating limits are purpose include incorporating neutron-absorbing material specified in the standard.

such as boron in process equipment. This regulatory guide provides guidance for complying with this portion of the Maximum permissible concentrations of homogeneous Commission's regulations by describing procedures accept- solutions of plutonium or of uranium in vessels of unlimited able to the NRC staff for the prevention of criticality size packed with borosilicate-glass raschig rings are specified accidents by use of borosilicate-glass raschig rings as a in the standard. The concentration of these solutions is neutron absorber in solutions of fissile material. expressed as the mass of plutonium or of uranium per unit volume. The density of hydrogen in any solution Any information collection activities mentioned in this cannot be less than 75 g/liter nor greater than 115 g/liter.

regulatory guide are contained as requirements in 10 CFR Limitations on the relative abundance of the various Part 70, which provides the regulatory basis for this guide. isotopes of plutonium are imposed in the specifications The information collection requirements in 10 CFR Part 70 applicable to plutonium solutions.. The concentrations have been cleared under OMB Clearance No. 3150-0009. specified for uranium enriched in 2 3 sU apply regardless of the 2 3 5 U enrichment content but with a limitation on the

233

B. DISCUSSION

U content. For solutions of uranium containing up to

5.0 wt-% 2 35 U and up to 0.01 wt-% 2 3 3 U (see Table 12 on ANSI/ANS-8.5-1986, "Use of Borosilicate-Glass Raschig page 8 of the standard), the maximum permissible solution Rings as a Neutron Absorber in Solutions of Fissile Mate- concentration is unrestricted. The concentrations specified rial,"' is a revision of ANSI/ANS-8.5-1979 and was pre- for solutions of 2 3 3 U also apply to mixtures of 2 3 3 U and pared by Subcommittee 8, Fissionable Materials Outside other uranium isotopes.

Reactors, of the Standards Committee of the American Nuclear Society. ANSI/ANS-8.5-1986 was approved by the

C. REGULATORY POSITION

American National Standards Committee N16, Nuclear Criticality Safety, in 1985 and by the American National The guidance contained in ANSI/ANS-8.5-1986 for Standards Institute (ANSI) on January 3, 1986. the use of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material provides a procedure

1Copies may be obtained from the American Nuclear Society, on page 8 of the standard, 41Pu >

2 4 12Pu Note in TblePu thatread should 1 >(3 1 4) PU.

u4

555 North Kensington Avenue, La Grange Park, Illinois 60525.

USNRC REGULATORY GUIDES The guides are Issued In the following ten broad divisions:

Regulatory Guides are Issued to describe and make available to the public methods acceptable to the NRC staff of Implementing 1. Power Reactors 6. Products specific parts of the Commission's regulations, to delineate tech- 2. Research and Test Reactors 7. Transportation niques used by the staff In evaluating specific problems or postu- 3. Fuels and Materials Facilities 8. Occupational Health lated accidents or to provide guidance to applicants. Regulatory 4. Environmental and Siting 9. Antitrust and Financial Review Guides are not substitutes for regulations, and compliance with 5. Materials and Plant Protection 10. General them Is not required. Methods and solutions different from those set out In the guides will be acceptable If they provide a basis for the findings requisite to the Issuance or continuance of a permit or Copies of Issued guides may be purchased from the Government license by the Commission. - Printing Office at the current GPO price. Information on current GPO prices may be obtained by contacting the Superintendent of This guide was Issued after consideration of comments received from Documents, U.S. Government Printing Office, Post Office Box the public. Comments and suggestions for Improvements In these 37082, Washington, DC 20013-7082, telephone (202)275-2060 or guides are encouraged at all times, and guides will be revised, as (202)275-2171.

appropriate, to accommodate comments and to reflect new Informa- tion or experience.

Issued guides may also be purchased from the National Technical Written comments may be submitted to the Rules and Procedures Information Service on a standing order basis. Details on this Branch, DRR ADM, U.S. Nuclear Regulatory Commission, service may be obtained by writing NTIS, 5285 Rort Royal Road, Washington, D6 20555. Springfield, VA 22161.

generally acceptable to the NRC staff for the prevention of The methods described in this guide were applied in a accidental conditions of criticality. number of specific cases during reviews and selected licensing actions. These methods reflect the latest general Section 8.0 of ANSI/ANS-8.5-1986 lists additional docu- NRC approach to criticality safety in operations involving ments referred to in the standard. The specific applicability use of borosilicate-glass raschig rings as a neutron absorber or acceptability of these listed documents will be covered in solutions of fissile material. Therefore, except in those separately in other regulatory guides, where appropriate. cases in which the applicant proposes an acceptable alter- native method for complying with specified portions of

D. IMPLEMENTATION

the Commission's regulations, the methods described in The purpose of this section is to provide information to this guide will be used in the evaluation of submittals in applicants regarding the NRC staff's plan for using this connection with license applications submitted Uinder regulatory guide. 10 CFR Part 70.

3.1-2

VALUE/IMPACT STATEMENT

A draft value/impact statement was published with the guide has not been prepared. A copy of the draft oposed Revision 2 to Regulatory Guide 3.1 (Task CE value/impact statement is available for inspection and

602-4) when the draft guide was published for public copying for a fee at the Commission's Public Document comment in March 1987. No changes were necessary, Room at 1717 H Street NW., Washington, DC, under so a separate value/impact statement for the final Task CE 602-4.

,.S. G.P.O. 1987-181-682:60212

3.1-3

UNITED STATES FIRST CLASS MAIL

NUCLEAR REGULATORY COMMISSION POSTAGE It FEES PAID

USNRC

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

PENALTY FOR PRIVATE USE, $300