ML19260B205

LER 79-145/03L-0:on 791106,RHR Sys Removed from Svc When Sys Inlet Valve MOV-1701 Closed.Caused by Installation of Jumper in Solid State Protection Sys to Allow Performance of Time Response Testing.Jumper Removed Immediately

ML19260B205
Person / Time
Site:	North Anna
Issue date:	12/04/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260B204	List: ML19260B203 ML19260B205
References
LER-79-145-03L, LER-79-145-3L, NUDOCS 7912070409
Download: ML19260B205 (2)

Text

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,o 9 lL l@l0l5l0l0l0l3l318 @l1l 1l 0 l 6l 7 9 h l Il 2 OI 4I 7! 4 lh 60 61 DOCKET NUMBER 68 69 kVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l On November 6,1979, with the unit in Mode 6. the Residual Heat Rer, ova l Syntom una l o a l removed from service when system inlet valve MOV-1701 went closed. Since the Residual l o 4 I Heat Removal System was lost for only 5 minutes, the health and safety of the penarn1 I loisl l Public were not affected. This event is reportable pursuant to T.S. 6.9 .1.9 . b . I I

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0 l8 5l@ 47 CAUSE DESCPIPTION AND f,ORRECTIVE ACTIONS h i O IMOV-1701 went closed when a jumper was installed in the Solid State Protection Systen I i , lto allow time response testing to be performed. The jumper was immed iate1v re~nved l i l 21 land coolant circulation was restored by reopening MOV-1701. I i a i l I

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-145/03L-0 Description of Event On November 6,1979 with the unit in a refueling shutdown, the Residual Heat Removal System was removed from service wnen system inlet valve MOV-1701 went closed. This event is contrary to T.S. 3.9.8 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence The Residual H?at Removal System is used during refueling operations to circulate reactor coolant and maintain the temperature below 140*F. Since the system was returned to service within 5 minutes, the health and safety of the general public were not affected. No generic implications exist for this event.

Cause of Occurrence MOV-1701 vent closed when a jumper was installed for the purpose of conducting time response testing of the Solid State Protection System without disabling the automatic actuation of the RHR inlet valves.

Immediate Corrective Action The jumper was i= mediately removed and MOV-1701 was reopened to reestablish flow through the Residual Heat Removal System.

Scheduled Corrective Action A design change is being evaluated which will allow performance of response time testing without installation of a jumper.

Actions Taken to Prevent Recurrence Prior to its reinstallation, the jumper was corrected so as not to affect the RER inlet valves.

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