ML20039F146

Advises That Components,Including Relays,Potential Transformers,Associated Auxiliary Relays & Power Supplies Are safety-related Equipment.Util Should Propose Tech Spec Changes That Include Surveillance of Components

ML20039F146
Person / Time
Site:	Hatch
Issue date:	12/10/1981
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Beckham J GEORGIA POWER CO.
References
TAC-11026, TAC-11262, TAC-47044, TAC-47045, TAC-47876, TAC-47877, NUDOCS 8201120070
Download: ML20039F146 (2)

Text

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l l 14 MCEMBER 10 ~1981 DISTRIBUTION:

NSIC OELD Docket File ORB #4 Rdg AEOD NRC PDR DEisenhut IE-3 L PDR MFai rtile ACRS-10 TERA RIngram Gray File Dockets Nos. 50-321 and 50-366

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DECJ g 084 '9,-I Vice President - Engineering E'

Mr. J. T. Beckham, Jr.

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Georgia Power Company

u. D 41,*,*en P. O. Box 4545 p-Atlanta, Georgia 30302 Qr.

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Dear ifr. Beckham:

sfQT\\ 6 On April-6,1981 we were infbmed by telephone of the. failure of the Ifatch Unit 1 emergency power di.esel-generators to energi.ze the.4160 volt emergency engineered safety featums buses, during a simulation of total loss of offsite power to Unit 1.. While the diesels started, the breakers between the diesel-generators and the emergency buses

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failed to close. The failum was caused by misoperation of two non-

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Class 1E undervoltage relays that are part of the. preferred offsite power system. The function of these relays is to ensure closure of 4160 volt, Class 1E, circuit breakers, to load the 4160 volt buses fmm the diesels when offsite power is lost. You subsequently _in-fomed NRC of the event by LER 50-321/1981-026, dated Ap_ril 16, 1981.

The present design does not comply _with.the applicable requimments of IEEE-279-1971.- From discussions between.our staffs we understand

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that Georgia Power Cogany.is= replacing the failed design with com.

ponents that satisfy IEEE-279 requimments.1 We regarti these compo.

nents, including the relays, potential transfomers,. associated auxiliary relays and their power supplies;as safety related equipment.

As a consequence, Georgia Power Company should propose Technical SPeci-fication changes that include surveillance of these components, on a schedule consistent with other.similar safety-related electrical devices.

Kindly provide your schedule for improvements and planned submittal.

date of your nodified design within 30. days.of receipt of this letter.

Provide proposed Technical Specification changes within 30 days of receipt of this letter.

Sincerely, ogg1GUIAL316I p r. STOM' '

John F. Stolz, Chief Operating Reactors. Branch #4,

Division.of Licensing

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' Hatch 1/2 50-321/366 Giorgia Power Company cc w/ enclosure (s):

G. F. Trowbridge, Esq.

Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.

Washington, D. C.

20036 Ruble A. Thomas Vice President P. O. Box 2625 Southern Services, Inc.

Birmingham, Alabama 35202

.Ozen Batum Charles H. Badger P. 0. Box 2625 Office of Planning and Budget Southern Services, Inc.

Room 610 Birmingham, Alabama 35202 270 Washington Street, S.W.

Atlanta, Georgia 30334 Chairman Appling County Commissioners County Courthouse Baxley, Georgia 31513 Mr. L. T. Gucwa Georgia Power Company Engineering Department P. O. Box 4545 Atlanta, Georgia 30302 Mr. Max Manry Georgia Power Company Edwin I. Hatch Plant P. O. Box 442 Baxley,-Georgia 31513 Regional Radiation Representative EPA Region IV 345 Courtland Street, N.E.

Atlanta, Georgia 30308 Appling County Public Library 301 City Hall Drive Baxley, Georgia 31513 Mr. R. F. Rodgers go.S.NclearRegox279ulatory Conmission ute, P. O.

Baxley, Georgia 31513 A

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