NRC Generic Letter 1981-37: Difference between revisions
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{{#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 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.Sincerely,Division of LicensingOffice of Nuclear Reactor Regulationcc: Service List82010400015 tI2% 9NofI | ||
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Sincerely,Division of LicensingOffice of Nuclear Reactor Regulationcc: Service List82010400015 tI2% 9NofI}} | |||
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Revision as of 18:15, 6 April 2018
| ML031110052 | |
| Person / Time | |
|---|---|
| Issue date: | 12/29/1981 |
| From: | Eisenhut D G Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| GL-81-037, NUDOCS 8201040001 | |
| Download: ML031110052 (1) | |
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.Sincerely,Division of LicensingOffice of Nuclear Reactor Regulationcc: Service List82010400015 tI2% 9NofI