ML19344D302

LER 80-011/03L-0:on 800226,during Boron Injection Flow Path Verification,Operator Stroked MOV-SI-869A Connecting Charge Sys Fill Header to RCS Hot Leg Piping.Valve Opened & Linestarter Tripped.Caused by Burnt Motor in MOV-SI-869A

ML19344D302
Person / Time
Site:	Beaver Valley
Issue date:	03/04/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19344D281	List: ML19344D280 ML19344D283 ML19344D285 ML19344D288 ML19344D290 ML19344D294 ML19344D296 ML19344D302
References
LER-80-011-03L, LER-80-11-3L, NUDOCS 8003110647
Download: ML19344D302 (2)

Text

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• t.4 el ;F.M T *.LlYu t 4 EVENT DESCR8PTION A*.O PROD ASLE CONSECutNGES h Io l; } l During performance of OST 1.11.10, Uloron inicetion Flow Path Verification), the l io!3, [ operator stroked the valve [MOV-SI-869Al which connects the charging system fill l

[a !4 l l header to the RCS hot leg pipinn. The valve opened and the linestarter tripped, i lo,31 [resultinc in a low VCT Icvel since the VCT is physically higher than the Reactor l loI.,Il Coolant System. The increasing coolant system level was a problem due to possible i Io } 7 j i floodina of the reactor vessel head flance which would require removal of the head, [

tai ;l replacement of the "0" rings, and also cause a radiolonical (continued on attached)I s0 SystEt, CAUSE CALSE COV# VALVE CCDE CO3E SuSCODE COMPONENT CODE SuaCODE SuSCODE lTITl l Rl Bl@ y@ l A ]@ l Vl Al 1.l Vl Ol plh a l A l@ lZ.a l @

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47 JJ CAUSE DE3ORIPT10N AND CORRECTIVE ACTIONS h l i l 31 l 0n 8/27/79, it was found that the motor for IMOV-SI-869Al had been burned un and thel l i l i l l manual actuator could not be encaned. The linestarter had failed, causing the f ii,7; icontactor to remain closed, keeping the motor enercized after the valve had stroked I ii;3l l fully open. This was the second failure of the motor on this valve. The l ii,4; l linestarter is beine examined to determine the failure mode. (continued on attached)l 80 7 4 9 .

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o Att.ichment To I.ER 80-11/03L Beaver Valley Power Station .

Duquesne Light Company , .

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Event Description And Proh.ible Consequences (continued) '

1 problem with the personnel in the reactor cavity who were decontaminating the area in preparation for stud installation and tensioning. The operator was dire::ted at this time to close the VCT outlet valves [MOV-CH-115C E] to terminate the level increase. The valve [MOV-Cll-115C) did not stroke closed as was indicated by both open and closed indicating lights being lit at the ,

' - same time. Valve [MOV-Cll-115E), however, did fully close and stopped the level increase at 707. in the loops. There was no hazard to the public at any time during the event since several flow paths were availabic for makeup to the RCS.

Caus_ Description And Corrective Actions (continued)

The failure of the VCT outlet' valve was ut.'ed by (irty torque switch contacts.

A redundant flow path through [MOV-SI-836] was ver ad operable. No alternate action was required on [MOV-CH-115C) since its opr on is only required in Modes 1 through 4. The motor operator was replace mediately under Maintenance Work Request 800242. This incident has been consh. ed closed pending final analysis of the problem with Limitorque valve operators.

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