NRC Generic Letter 1981-37: Difference between revisions

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| issue date = 12/29/1981
| issue date = 12/29/1981
| title = NRC Generic Letter 1981-037: Odyn Code Reanalysis Requirements
| title = NRC Generic Letter 1981-037: Odyn Code Reanalysis Requirements
| author name = Eisenhut D G
| author name = Eisenhut D
| author affiliation = NRC/NRR
| author affiliation = NRC/NRR
| addressee name =  
| addressee name =  
Line 14: Line 14:
| page count = 1
| page count = 1
}}
}}
{{#Wiki_filter:AUNITED STATES ,NUCLEAR REGULATORY COMMISSIONWASHINGTON, D. C. 20555December 29, 1981ALL BOILING WATER REACTOR LICENSEES (EXCEPT HUMBOLDT BAY AND DRESDEN 1)SUBJECT: ODYN CODE REANALYSIS REQUIREMENTS (GENERIC LETTER 81-37 )By letter dated November 4, 1980 we informed you of our requirements for useof the ODYN code to calculate pressurization transients. We stated that afterJanuary 1982 all operating BWRs with General Electric analyses must have thelimiting transients recalculated with the ODYN code, even if no reload submittalhas been received.By letter dated January 29, 1981 we provided you a safety evaluation and asupplemental safety evaluation describing our basis for acceptance of thiscode, and information required for ODYN application, including a description oftwo options for application.For those plants which can be demonstrated to have scram times bounded by theoption B scram time distribution, the option B calculations would be expected tobe less limiting than REDY. Therefore, delay of ODYN analyses until the nextrefueling is a reasonable approach. For such plants, the licensees are requestedto submit to the NRC before January 1982 their conclusion that option B isapplicable to their plant. Those plants which cannot demonstrate scram timesbounded by the option B scram time distribution should, by January 1982, submitODYN analyses in accordance with option A or should propose and support otherappropriately conservative operating limitations.This request for information was approved by OMB under clearance number3150-0080 which expires December 31, 1982. Comments on burden and dupli-cation may be directed to the Office of Management and Budget, ReportsManagement Room 3208, New Executive Office Building, Washington, D. C. 20503.
{{#Wiki_filter:AUNITED   STATES   ,
                      NUCLEAR REGULATORY         COMMISSION
                                WASHINGTON, D. C. 20555 December 29, 1981 ALL BOILING WATER REACTOR LICENSEES (EXCEPT HUMBOLDT BAY AND DRESDEN 1)
SUBJECT:   ODYN CODE REANALYSIS REQUIREMENTS (GENERIC LETTER 81-37 )
By letter dated November 4, 1980 we informed you of our requirements for use of the ODYN code to calculate pressurization transients. We stated that after January 1982 all operating BWRs with General Electric analyses must have the limiting transients recalculated with the ODYN code, even if no reload submittal has been received.


Sincerely,Division of LicensingOffice of Nuclear Reactor Regulationcc: Service List82010400015 tI2% 9NofI}}
By letter dated January 29, 1981 we provided you a safety evaluation and a supplemental safety evaluation describing our basis for acceptance of this code, and information required for ODYN application, including a description of two options for application.
 
For those plants which can be demonstrated to have scram times bounded by the option B scram time distribution, the option B calculations would be expected to be less limiting than REDY. Therefore, delay of ODYN analyses until the next refueling is a reasonable approach. For such plants, the licensees are requested to submit to the NRC before January 1982 their conclusion that option B is applicable to their plant. Those plants which cannot demonstrate scram times bounded by the option B scram time distribution should, by January 1982, submit ODYN analyses in accordance with option A or should propose and support other appropriately conservative operating limitations.
 
This request for information was approved by OMB under clearance number
3150-0080 which expires December 31, 1982. Comments on burden and dupli- cation may be directed to the Office of Management and Budget, Reports Management Room 3208, New Executive Office Building, Washington, D. C. 20503.
 
Sincerely, Division of Licensing Office of Nuclear Reactor Regulation cc:   Service List
                                                                  8201040001
                                                                            5    tI2% 9 Nof I}}


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Latest revision as of 03:05, 24 November 2019

NRC Generic Letter 1981-037: Odyn Code Reanalysis Requirements
ML031110052
Person / Time
Issue date: 12/29/1981
From: Eisenhut D
Office of Nuclear Reactor Regulation
To:
References
GL-81-037, NUDOCS 8201040001
Download: ML031110052 (1)
v • d • e


AUNITED STATES ,

NUCLEAR REGULATORY COMMISSION

WASHINGTON, D. C. 20555 December 29, 1981 ALL BOILING WATER REACTOR LICENSEES (EXCEPT HUMBOLDT BAY AND DRESDEN 1)

SUBJECT: ODYN CODE REANALYSIS REQUIREMENTS (GENERIC LETTER 81-37 )

By letter dated November 4, 1980 we informed you of our requirements for use of the ODYN code to calculate pressurization transients. We stated that after January 1982 all operating BWRs with General Electric analyses must have the limiting transients recalculated with the ODYN code, even if no reload submittal has been received.

By letter dated January 29, 1981 we provided you a safety evaluation and a supplemental safety evaluation describing our basis for acceptance of this code, and information required for ODYN application, including a description of two options for application.

For those plants which can be demonstrated to have scram times bounded by the option B scram time distribution, the option B calculations would be expected to be less limiting than REDY. Therefore, delay of ODYN analyses until the next refueling is a reasonable approach. For such plants, the licensees are requested to submit to the NRC before January 1982 their conclusion that option B is applicable to their plant. Those plants which cannot demonstrate scram times bounded by the option B scram time distribution should, by January 1982, submit ODYN analyses in accordance with option A or should propose and support other appropriately conservative operating limitations.

This request for information was approved by OMB under clearance number

3150-0080 which expires December 31, 1982. Comments on burden and dupli- cation may be directed to the Office of Management and Budget, Reports Management Room 3208, New Executive Office Building, Washington, D. C. 20503.

Sincerely, Division of Licensing Office of Nuclear Reactor Regulation cc: Service List

8201040001

5 tI2% 9 Nof I

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