05000334/LER-1980-020-03, /03L-0:on 800329,during Operations to Increase Level in RCS Loops,Vol Control Tank Outlet MOV-CH-115C Found Closed.Vol Control Tank Level Indicated Normally.Caused by Bad Fuse Holder for Level Bistable.Fuse Holder Replaced

/03L-0:on 800329,during Operations to Increase Level in RCS Loops,Vol Control Tank Outlet MOV-CH-115C Found Closed.Vol Control Tank Level Indicated Normally.Caused by Bad Fuse Holder for Level Bistable.Fuse Holder Replaced

ML19309G386
Person / Time
Site:	Beaver Valley
Issue date:	04/29/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309G382	List: 05000334/LER-1980-020, Forwards LER 80-020/03L-0 05000334/LER-1980-020-03, /03L-0:on 800329,during Operations to Increase Level in RCS Loops,Vol Control Tank Outlet MOV-CH-115C Found Closed.Vol Control Tank Level Indicated Normally.Caused by Bad Fuse Holder for Level Bistable.Fuse Holder Replaced
References
LER-80-020-03L, LER-80-20-3L, NUDOCS 8005060241
Download: ML19309G386 (2)

LER-1980-020, /03L-0:on 800329,during Operations to Increase Level in RCS Loops,Vol Control Tank Outlet MOV-CH-115C Found Closed.Vol Control Tank Level Indicated Normally.Caused by Bad Fuse Holder for Level Bistable.Fuse Holder Replaced

Event date:
Report date:
3341980020R03 - NRC Website

text

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KRC FORM 364 U. S. NUCLEA2 REGULATCSY COMMISSION (7 77) -

LICENSEE EVENT REPORT 800 2

30g N

CONTROL. BLOCC l l

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i (PLEAsE PRmiOR TYPE ALL REQUIRED WFORMATIONI

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8 to el ooCK47NuYSER es 09 LVENT oATE 74 7s REPORT oArg so EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h fiiTil IFlant operators were going to increase level in the Reactor Coolant System loops l

o lwhich are presently at mid-span when they found the Volume Control Tank (VCT) outlet l l[MOV-CH-115C) closed. The Refueling Water Storage Tank (RWST) outlet valves were I

o A o s lopen, giving the impression that there was a low VCT level. VCT level indicated I

o s lnormally (40%) and there was no low-low level alarm in.

The operator stroked the f

o i l valve and deenergized the linestarter to keep it open.

There were no probable I

o a l consequences at this time because the plant is shutdown and (continued on atrached)l 7

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g lThe cause of the problem was equipment malfunction as a result of a bad fuse holder l i i lfor the level bistable that controls the low-low level operation of the VCT out1.t I

, 7 l valves and the RWST cutlet valves. The permanent corrective action for this problem l i 3 lwas to replace the fuse holder. There have been no problems of this type with the i 4 l process control system.

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. r Attachment To LER 80-20/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50 ~l34 Event Description And Probable Consequences.

there was no need for a charging pump.

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