ML19322E577

Forwards LER 80-008/01T-0

ML19322E577
Person / Time
Site:	Peach Bottom
Issue date:	03/18/1980
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19322E578	List: ML19322E577 ML19322E579
References
NUDOCS 8003280429
Download: ML19322E577 (2)

Text

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• PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHIA. PA.19101 (2153841 4o00  !

l M.- ch 18, 1980 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406

SUBJECT:

Licensee Event Report Narrative Description Region I, The following occurrence yas reported to Mr. Cowgill, Office of Inspection and Enforcement on March 5, 1980.

Reference:

Docket Number 50-277 50-278 Report No: LER 3-80-8/1T-0 Report Date: March 19, 1980 Occurrence Date: March 5, 1980 Facility:

Peach1,Bottom Atomic Power Station R.D. Delta, PA 17314 Technical Sgecification Re fe renc e :

Technical Specification 6.9.2.a(5) requires reper:ing " Failure or malfunction of one or more components which prevents or could prevent, by itself, the fulfillment of the functional requirements of system (s) used to cope with accidents analyzed in the SAR."

Descri,gtion of the Event:

Whilecausing Substation at 100% power, No. I trans former tri eAex at the North a loss of power to Unit 3 ' . t .. r t u o feed. Unit 3 E13 and E134 centers, E33 4KVandbuses E334 fast transferred and e 34 e: heir 480V load respectively. Thr. .s0" *eeaker E134 reclosed after three seconds as designed, 's u i (;44 breaker failed to reclose. During recovery, it was note; that tas 'A' core spray system valves had no power. E334 breaker vas immediataly reclosed

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80032 so + z9 9

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Mr. Doyce H. Grier Page 2 March 18, 1980 LER 3-80-8/lT-0 l

from the control room. The 'A' core spray system valves were 1 without power for less than two minutes.

Consequences of Event:

i When this event occurred, the 'A' LPCI system had already been  ;

declared inoperable due to failure to pass a surveillance test.  !

(Reference LER 3-80-03/3L). As a result two subsystems needed to l cope with large line break LOCA were inoperable from the automatic actuation mode. The 'B' core spray and 'B' LPCI systems were operable during the event.

Cause of Event: i j

The cause of this occurrence was failure of a normally energized Agastat relay to pick up when power was restored to the 1 4KV E bus. This prevented auto reclosure of E334 breaker three I

seconds after restoration of power.

Corrective Action:

The Agastat relay was replaced and tested. Engineering is reviewing this problem to determine if a modification is needed.

Previous Similar Occurrence LER 3-77-62/lT Yours truly,

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$. . Cooney Su rintendent Attachment Generation Division-Nuclear cc: Director, NRC - Office of Inspection and Enforcement Mr. Norman M. Haller, NRC - Office of Management &

Program Analysis I

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