ML20003C027
| ML20003C027 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 02/20/1981 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| TASK-06-07.A1, TASK-6-7.A1, TASK-RR LSO5-81-02-040, LSO5-81-2-40, NUDOCS 8102260472 | |
| Download: ML20003C027 (2) | |
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FEB 2 0 y Docket No. 50-29 LS05-81-02-040 Mr. James A. Kay Senior Engineer - Licensing Yankee Atomic Electric Company 1671 Worcester Street Framingham, Mass. 01701
Dear Mr,
Kay:
SUBJECT:
YANKEE R0WE - SEP TOPIC VI-7.A.1, ECCS REEVALUATION TO ACCOUNT FOR INCREASED VESSEL UPPER HEAD TEMPERATURE The safety objective of this topic is to ensure that correct upper head temperatures were used in the loss-of-coolant-accident (LOCA) analysis.
Originally, LOCA analyses for all Westinghouse reactors were conducted assuming that the temperature of the water in the upper head region of the reactor vessel was the same as the inlet water temperature because of a bypass flow from the downcomer to the upper head. Temperature measurements made by Westinghouse indicate that tha actual temperature of the upper head fluid is almost as high as the hot leg (outlet) temperature. All operating reactors were required to resubmit LOCA analyses using hot leg temperature for the upper head volume.
The staff's safety evaluation of Amendment No. 34 to Facility License No. DPR-3, dated January 10, 1977, accepted revised analyses with upper head fluid temperature equal to the hot leg (outlet) temperature.
Since this approved analysis satisfies the safety objective of SEP Topic VI-7.A.1, this topic is considered to be complete. This letter is provided only to document topic status; no response is required.
Sincerely, Dennis M. Crutc ield, hief Operating Reactors Branch #5 Division of Licensing go/
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Mr. Janes A. Kay CC Mr. Janes E. Tribble, President Yankee Atomic Electric Conpany 25 Research Drive Westborough, Massachusetts 01581 Greenfield Cormunity College 1 College Drive Greenfield, Massachusetts 01301 Chairman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 Director, Criteria and Standaris Division Office of Radiation Programs (ANR-460)
U. S. Environmental Protection Agency Washington, D. C.
20460 U. S. Environmental Protection Agency Region 1 Office ATTN: EIS C0ORDINATOR JFK Federal Building Boston, Massachusetts 02203 Resident Inspector Yankee Rowe Nuclear Power Station c/o U.S. NRC Post Office Box 28 Monroe Bridge, Massachusetts 01350
.