ML20027D363
| ML20027D363 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 11/02/1982 |
| From: | Caruso R Office of Nuclear Reactor Regulation |
| To: | Kay J YANKEE ATOMIC ELECTRIC CO. |
| References | |
| TASK-08-01.A, TASK-8-1.A, TASK-RR LSO5-82-11-006, LSO5-82-11-6, NUDOCS 8211040199 | |
| Download: ML20027D363 (3) | |
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.o November 2,1982 Cocket No. 50-29 LS05-82-ll-006 Mr. James A. Kay Senior Engineer - Licensing Yankee Atomic Electric Company 1671 Worcester Road Framingham, Massachusetts 01701
Dear Mr. Kay:
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SUBJECT:
SEP TOPIC VIII-1.A, POTENTIAL EQUIPMENT FAILURES ASSOCIATED WITH A DEGRADED GRID VOLTAGE - YANKEE NUCLEAR POWER STATION The purpose of the above topic is to assure that a degradation of the offsite power system will not result in the loss of capability of redundant safety-related equipment and to determine the susceptibility of such equipment to the interaction of onsite and offsite emergency power sources. The resolution of multi-plant actions B-23 and B-48 satisfy the requirements of this SEP topic. The purpose of MPA B-23 is to determine the grid characteristics and to provide a suitable system to isolate the plant from the grid in the event of grid voltage degradation. The purpose of MPA B-48 is to determine the minimum acceptable bus conditions which will then define the set point for the degraded grid pmtection system.
Our Safety Evaluation Report for MPA B-23 for Yankee was forwarded to you by letter dated September 27, 1982.
In that letter, the staff found your proposed modification to provide automatic separation of the Class 1E buses from a degraded offsite power source under accident conditions acceptable.
Under non-accident conditions, however, a degraded grid voltage con-dition requires operator actions to protect the Class 1E systems.
The letter sent to you proposed that operating procedures be developed to handle such situations. The development of these procedures will be reviewed during the SEP Integrated Assessment of your facility, Because these procedures are directly related to our evaluation of 4
SEP Topic VII-3, Safe Shutdown.
We have also requested the design details for diesel generator load shedding. These details are directly related to our evaluation of g@
SEP Topic VIII-2, Onsite Emergency Power Systems - Diesel Generator.
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James A. Kay Regarding the resolution of multi-plant action B-48, our SER was an enclosure to a letter from D. Crutchfield to J. A. Kay dated July 13, 1981. Our SER stated that B-48 had been completed in a manner that was acceptable to the staff.
For the reasons discussed above, SEP Topic VIII-1.A is considered complete for the purpose of conducting the integrated assessment of your facility.
Sincerely, Ralph Caruso, Project Manager Operating Reactors Branch #5 Division of Licensing cc: See next page
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Mr. James A. Kay CC Mr. James E. Tribble, President Yankee Atomic Electric Company 1671 Worcester Road
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Framingham, Massachusetts 01701 Chai rman Board of Selectmen Town of Rowe Rowe, Massachusetts 01367 Energy Facilities Siting Council 14th Floor One Ashburton Place Boston, Massachusetts 02108 U. S. Environmental Protection Agency Region I Office ATTN: Regional Radiation Representative 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 Ronald C. Haynes, Regional Administrator Nuclear Regulatory Commission, Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 y
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