ML18153D068

Accepts Licensee Clarification That Normal Source of Power Supply to Class 1E Buses Is Through Reserve Station Svc Transformers,Per 920624 Submittal in Response to Reg Guide 1.155 on SBO Pending Resolution of Generic Issue B-56

ML18153D068
Person / Time
Site:	Surry
Issue date:	07/22/1992
From:	Buckley B Office of Nuclear Reactor Regulation
To:	Stewart W Virginia Power (Virginia Electric & Power Co)
References
REF-GTECI-B-56, REF-GTECI-EL, RTR-REGGD-01.155, RTR-REGGD-1.155, TAC-M68611, TAC-M68612, TASK-B-56, TASK-OR NUDOCS 9207300113
Download: ML18153D068 (2)

Text

Docket Nos. 50-280 and 50-281 Mr. W. L. Stewart e

July 22, 1992 e DISTRIBUTION Docket File OGC Senior Vice President - Nuclear Virginia Electric and Power Company 5000 Dominion Blvd.

NRC & Local PDR SVarga GLainas HBerkow BBuckley ACRS (10)

AToalston FRosa MSinkule PD22 Rdg Glen Allen, Virginia 23060 OMil 1 er

SUBJECT:

SURRY POWER STATION, UNITS 1 AND 2 - STATION BLACKOUT - EMERGENCY DIESEL GENERATOR RELIABILITY (TAC NOS. M68611 ANO M68612)

We have reviewed your submittal dated June 24, 1992, which responded to our Supplemental Safety Evaluation (SSE) transmitted to you by letter dated May 12, 1992.

We find acceptable your commitment to maintain, as a minimum, the five elements of Section 1.2 of Regulatory Guide 1.155, "Station Blackout" pending the resolution of Generic Issue 8-56, "Emergency Diesel Generator Reliability," at which time you will assess your program for continued compliance.

We also acknowledge your points of clarification with respect to Section 2.1, "Station Blackout Duration" and Section 2.3, "Compressed Air" of our SSE.

With respect to station blackout duration, we accept your clarification that the normal source of power supply to the Class IE (safe shutdown) buses at Surry is through the reserve station service transformers, and there are no automatic transfers upon loss of the main unit generator.

However, this is equivalent to (or better than) an automatic transfer of power to the safety buses upon loss of the main generator. Therefore, the conclusion reached in the SSE as to the classification of the independence of offsite power group as "I 1/2" does not change, and the required coping duration remains at 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> as stated in our SSE and as determined by your staff.

With respect to the compressed air, please advise us once a decision has been reached as to the final design selected for coping with a station blackout.

We find your planned actions to cope with a station blackout event acceptable and are, therefore, closing out TAC Nos. M68611 and M68612.

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OFFICE LA:P022 NAME DATE 7/ol//92 OFFICIAL RECORD COPY FILE NAME:

SU68611.LTR 7/'J,"v 92 Sincerely, (Original Signed By)

Bart C. Buckley, Sr.. Project Manager Project Directorate 11~2 Division of Reactor Projects - 1/11 Office of Nuclear Reactor Regulation 7 /}1 /92

e Mr. W. L. Stewart Virginia Electric and Power Company cc:

Michael W. Maupin, Esq.

Hunton and Williams Post Office Box 1535 Richmond, Virginia 23212 Mr. Michael R. Kansler, Manager Surry Power Station Post Office Box 315 Surry, Virginia 23883 Senior Resident Inspector Surry Power Station U.S. Nuclear Regulatory Commission Post Office Box 166, Route 1 Surry, Virginia 23883 Mr. Sherlock Holmes, Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 Dr. W. T. Lough Virginia State Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23209 Regional Administrator, Region II U.S. Nuclear Regulatory Commission 101 Marietta Street N.W., Suite 2900 Atlanta, Georgia 30323 C.M.G. Buttery, M.D., M.P.H.

State Health Commissioner Office of the Commissioner Virginia Department of Health P.O. Box 2448 Richmond, Virginia 23218 Surry Power Station Attorney General Supreme Court Building 101 North 8th Street Richmond, Virginia 23219 Mr. E. Wayne Harrell Vice President - Nuclear Services Virginia Electric and Power Co.

5000 Dominion Blvd.

Glen Allen, Virginia 23060 Mr. J. P. O'Hanlon Vice President - Nuclear Operations Virginia Electric and Power Company 5000 Dominion Blvd.

Glen Allen, Virginia 23060 Mr. Martin Bowling Manager - Nuclear Licensing Virginia Electric and Power Company 5000 Dominion Blvd.

Glen Allen, Virginia 23060