05000338/LER-1980-073-03, /03L-0:on 800818,operability of One Low Head Safety Injection Sys Was Compromised When MOV-1863A Valve Was de-energized.Caused by Need to Rework Weld on Leaking Drain Valve.Weld Reworked & Tested Satisfactorily

/03L-0:on 800818,operability of One Low Head Safety Injection Sys Was Compromised When MOV-1863A Valve Was de-energized.Caused by Need to Rework Weld on Leaking Drain Valve.Weld Reworked & Tested Satisfactorily

ML19338D313
Person / Time
Site:	North Anna
Issue date:	09/16/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338D287	List: 05000338/LER-1980-073, Forwards LER 80-073/03L-0 05000338/LER-1980-073-03, /03L-0:on 800818,operability of One Low Head Safety Injection Sys Was Compromised When MOV-1863A Valve Was de-energized.Caused by Need to Rework Weld on Leaking Drain Valve.Weld Reworked & Tested Satisfactorily
References
LER-80-073-03L, LER-80-73-3L, NUDOCS 8009220306
Download: ML19338D313 (2)

LER-1980-073, /03L-0:on 800818,operability of One Low Head Safety Injection Sys Was Compromised When MOV-1863A Valve Was de-energized.Caused by Need to Rework Weld on Leaking Drain Valve.Weld Reworked & Tested Satisfactorily

Event date:
Report date:
3381980073R03 - NRC Website

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U.S. NUCLEAR REGULATORY' COMMISSION' 1 LICENSEE EVENT REPORT.

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E DOCIET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE: CONSEQUENCES _(10)~

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The ' operability of !one of the LHSI' systems was^ compromised when a valve 1(MOV- - /.

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drain valve'(1-SI-171). The consequence of de-energizina MOV-1863A is a

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blocked flow path"=fron'LHSI pump "A" to the charaina pumps."

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within the~72 hour. time limit denoted $n T.S. 3.5.2, the health and safety of /

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downstream of the valve'could be repaired. A defective weld was around out

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North Anna Power Station, Unit #1 Attachment: Page 1 of 1 Docket No. 50-338 Attachment to LER 80-073/03L-0

Description of Event

The operability of one of the Low Head Safety Injection systems was compromised when a valve (MOV-1863A) in the system was de-energized in order--to rework a weld on a leaking drain valve (1-SI-171). The applic-able T.S. is 3.5.2 and the event is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Event The consequence of de-energizing MOV-1863A is e blocked flow path from LHSI pump "A" to the charging pumps. Since t?.e system was restored to its normal operating condition in less than 20 hours2.314815e-4 days <br />0.00556 hours <br />3.306878e-5 weeks <br />7.61e-6 months <br />, well within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time limit denoted in T.S. 3.5.2, the health and safety of the general.public were not affected.

Cause of Event-The valve (MOV-1863A) had to be de-energized in order to rework a weld on a leaking drain valve (1-SI-171).

Immediate Corrective Action

The defective weld was ground out and avorked by procedure (MMP-CP-1).

The new weld was inspected by Quality C.ntrol er,gineers and tested satisfactorily.

1 Scheduled Corrective Action 1

No scheduled corrective action is required.

Actions Taken to Prevent Recurrence l

No further actions are required.

Generic Implications There are no generic implications.

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