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{{#Wiki_filter:Revision 2 September
{{#Wiki_filter:Revision 2 U.S. NUCLEAR REGULATORY COMMISSION                                                                   September 1987 REGULATORY GUIDE
1987 U.S. NUCLEAR REGULATORY  
                        OFFICE OF NUCLEAR REGULATORY RESEARCH
COMMISSION
                                                        REGULATORY GUIDE 3.1 (Task CE 602-4)
REGULATORY  
                        USE OF BOROSILICATE-GLASS RASCHIG RINGS AS A NEUTRON
GUIDE OFFICE OF NUCLEAR REGULATORY  
                                  ABSORBER IN SOLUTIONS OF FISSILE MATERIAL
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==
==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.
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.


Procedures for this purpose include incorporating neutron-absorbing material such as boron in process equipment.
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.


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 by use of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material.Any information collection activities mentioned in this regulatory guide are contained as requirements in 10 CFR Part 70, which provides the regulatory basis for this guide.The information collection requirements in 10 CFR Part 70 have been cleared under OMB Clearance No. 3150-0009.
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==
==B. DISCUSSION==
ANSI/ANS-8.5-1986, "Use of Borosilicate-Glass Raschig Rings 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  
U content. For solutions of uranium containing up to
8, Fissionable Materials Outside Reactors, of the Standards Committee of the American Nuclear Society. ANSI/ANS-8.5-1986 was approved by the American National Standards Committee N16, Nuclear Criticality Safety, in 1985 and by the American National Standards 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 of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material.
                                                                        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.


The standard applies to the use of borosilicate-glass raschig rings for primary and for secondary criticality control in solutions containing
Reactors, of the Standards Committee of the American Nuclear Society. ANSI/ANS-8.5-1986 was approved by the                                    
2 3 5 U, 2 3 9 Pu, and 2 3 3 U. The chemical and physical environment, properties of the rings and packed vessels, maintenance inspection procedures, and criticality operating limits are specified in the standard.Maximum permissible concentrations of homogeneous solutions of plutonium or of uranium in vessels of unlimited size packed with borosilicate-glass raschig rings are specified in the standard.


The concentration of these solutions is expressed as the mass of plutonium or of uranium per unit volume. The density of hydrogen in any solution cannot be less than 75 g/liter nor greater than 115 g/liter.Limitations on the relative abundance of the various isotopes of plutonium are imposed in the specifications applicable to plutonium solutions..
==C. REGULATORY POSITION==
The concentrations specified for uranium enriched in 2 3 sU apply regardless of the 2 3 5 U enrichment content but with a limitation on the 2 3 3 U content. For solutions of uranium containing up to 5.0 wt-% 2 3 5 U and up to 0.01 wt-% 2 3 3 U (see Table 12 on page 8 of the standard), the maximum permissible solution concentration is unrestricted.
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.


The concentrations specified for solutions of 2 3 3 U also apply to mixtures of 2 3 3 U and other uranium isotopes.C. REGULATORY
u4
POSITION The guidance contained in ANSI/ANS-8.5-1986 for the use of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material provides a procedure 2 4 1 2 Note that in Tble 1 (3 1 4) on page 8 of the standard, 41Pu >Pu should read Pu > u4 PU.USNRC REGULATORY
555 North Kensington Avenue, La Grange Park, Illinois 60525.
GUIDES Regulatory Guides are Issued to describe and make available to the public methods acceptable to the NRC staff of Implementing specific 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.


Regulatory Guides are not substitutes for regulations, and compliance with them Is not required.
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.


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 license by the Commission.
appropriate, to accommodate comments and to reflect new Informa- tion or experience.


-This guide was Issued after consideration of comments received from the public. Comments and suggestions for Improvements In these guides are encouraged at all times, and guides will be revised, as 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.


Written comments may be submitted to the Rules and Procedures Branch, DRR ADM, U.S. Nuclear Regulatory Commission, Washington, D6 20555.The guides are Issued In the following ten broad divisions:
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
1. Power Reactors 6. Products 2. Research and Test Reactors


===7. Transportation===
==D. IMPLEMENTATION==
3. Fuels and Materials Facilities
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.
8. Occupational Health 4. Environmental and Siting 9. Antitrust and Financial Review 5. Materials and Plant Protection
10. General Copies of Issued guides may be purchased from the Government Printing Office at the current GPO price. Information on current GPO prices may be obtained by contacting the Superintendent of Documents, U.S. Government Printing Office, Post Office Box 37082, Washington, DC 20013-7082, telephone
(202)275-2060
or (202)275-2171.


Issued guides may also be purchased from the National Technical Information Service on a standing order basis. Details on this service may be obtained by writing NTIS, 5285 Rort Royal Road, Springfield, VA 22161.
3.1-2


generally acceptable to the NRC staff for the prevention of accidental conditions of criticality.
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
Section 8.0 of ANSI/ANS-8.5-1986 lists additional docu-ments referred to in the standard.
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.
 
The specific applicability or acceptability of these listed documents will be covered separately in other regulatory guides, where appropriate.
 
==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 number of specific cases during reviews and selected licensing actions. These methods reflect the latest general NRC approach to criticality safety in operations involving use of borosilicate-glass raschig rings as a neutron absorber in solutions of fissile material.


Therefore, except in those cases in which the applicant proposes an acceptable alter-native method for complying with specified portions of the Commission's regulations, the methods described in this guide will be used in the evaluation of submittals in connection with license applications submitted Uinder 10 CFR Part 70.3.1-2 VALUE/IMPACT
,.S. G.P.O. 1987-181-682:60212
STATEMENT A draft value/impact statement was published with the oposed Revision 2 to Regulatory Guide 3.1 (Task CE 602-4) when the draft guide was published for public comment in March 1987. No changes were necessary, so a separate value/impact statement for the final guide has not been prepared.
                                                          3.1-3


A copy of the draft value/impact statement is available for inspection and copying for a fee at the Commission's Public Document Room at 1717 H Street NW., Washington, DC, under Task CE 602-4.,.S. G.P.O. 1987-181-682:60212
UNITED STATES             FIRST CLASS MAIL
3.1-3 UNITED STATES NUCLEAR REGULATORY  
NUCLEAR REGULATORY COMMISSION      POSTAGE It FEES PAID
COMMISSION
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WASHINGTON, D.C. 20555 FIRST CLASS MAIL POSTAGE It FEES PAID USNRC 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