05000334/LER-1980-031, Updated LER 80-031/01T-1:on 800521,total Loss of Residual Heat Removal Occurred When Valves Autoclosed.Caused by False High Pressure Signal.Vent Valve Weld Leak Repaired

Updated LER 80-031/01T-1:on 800521,total Loss of Residual Heat Removal Occurred When Valves Autoclosed.Caused by False High Pressure Signal.Vent Valve Weld Leak Repaired

ML20008E231
Person / Time
Site:	Beaver Valley
Issue date:	10/17/1980
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20008E226	List:
References
LER-80-031-01T, LER-80-31-1T, NUDOCS 8010240441
Download: ML20008E231 (2)

LER-1980-031, Updated LER 80-031/01T-1:on 800521,total Loss of Residual Heat Removal Occurred When Valves Autoclosed.Caused by False High Pressure Signal.Vent Valve Weld Leak Repaired

Event date:
Report date:
3341980031R00 - NRC Website

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'avtNroAfg 74 7S AtPoAr oATE 80 EVENT DESCMIPTION ANO PMo8ASLE CONSEQUENCES Oio l Upon finding a tenking Residual IIcat Remove.1 (RHR) System vent valve weld, an l

lo l 2l lT771lcvolution was commenced to reenergize the RHR iso 1'ation valves to permit rapid g

ITTT1 I isolation can ibility in case of a gross failure. A total loss of RER occurred when,

lthe" valves auto-closed due to a false high pressure signal from a deenergized i

io esl lo,s1Ichannel. Safety 2 plications were minimal since the leakage was contained and Che

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[TTTl l system was capable of total isolation.

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,,,o,lThe RHR isolation valves closed due to a false high pressure signal. The vent valve,

g Iweld leak vas repaired and the system returned to service. An engineerin

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g ]has been done of the RHR and Safety Injection vent and drain installations and l

g l necessarv supports have been added.

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Attachment To LER 80-31/01T-1 Beaver Valley Power Station Duquesne Light Company Docket No. 50'334 The engineering review package of modifications is available but is too lengthy to include in this report.

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