05000395/LER-1983-036-03, /03L-0:on 830414,during Performance of Channel Calibr,Pressurizer Safety Valve Position Indication on Valves Failed to Function Properly.Caused by Excessive Current Flow During Contact Closure.Switch Assembly Changed

/03L-0:on 830414,during Performance of Channel Calibr,Pressurizer Safety Valve Position Indication on Valves Failed to Function Properly.Caused by Excessive Current Flow During Contact Closure.Switch Assembly Changed

ML20023D456
Person / Time
Site:	Summer
Issue date:	05/13/1983
From:	Mckinney C SOUTH CAROLINA ELECTRIC & GAS CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20023D450	List: 05000395/LER-1983-036, Forwards LER 83-036/03L-0.Detailed Event Analysis Encl 05000395/LER-1983-036-03, /03L-0:on 830414,during Performance of Channel Calibr,Pressurizer Safety Valve Position Indication on Valves Failed to Function Properly.Caused by Excessive Current Flow During Contact Closure.Switch Assembly Changed
References
LER-83-036-03L, LER-83-36-3L, NUDOCS 8305200515
Download: ML20023D456 (1)

LER-1983-036, /03L-0:on 830414,during Performance of Channel Calibr,Pressurizer Safety Valve Position Indication on Valves Failed to Function Properly.Caused by Excessive Current Flow During Contact Closure.Switch Assembly Changed

Event date:
Report date:
3951983036R03 - NRC Website

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EVENT DESCRIPTION AND PROBABLE CONSECUENCES h I o l: lI The Pressurizer Safety Valve Position Indication on valves XVR-8010-A/B/C failed l

Lo p l l to function properly during the performance of a Channel Calibration. The Main l

lo (4 l l Control Board indication of valve position was received during the sinulatal valve l jol5ll opening; however, the indication did not change once received. There were no l

j o j e l l adverse consequences since alternate nethods of monitoring the valve position were l lo;7ll availabls for Operations personnel if the valves had opened while in Itdes 1, 2, j

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o CAUSE DESCRIPTION AND CC RRECTIVE ACTIONS h l t l o l l The cause of the switch fail'ure was excessive current flow during contact l

l t l i l l closure. The current was a result of the discharge of the cable capacitance.

l l t ! 2 i l The switch assenblies were replaced, and the circuit is being mcdified to I

i j nclude a current limiting resistor nearby the switches.

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,,,, ; been tested and wil'1 prevent a future recurrence of this failure.

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