ML19347D440

LER 81-014/01T-0:on 810221,while Preparing for Plant Startup,Weld Leak Occurred in Rcs.Cause of Weld Failure Is Unknown.New Procedure Was Implemented & Instrument Line Relocated.Followup Rept Will Be Provided

ML19347D440
Person / Time
Site:	Beaver Valley
Issue date:	03/09/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19347D437	List: ML19347D436 ML19347D440
References
LER-81-014-01T, LER-81-14-1T, NUDOCS 8103170609
Download: ML19347D440 (2)

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REPoRTcATE EVENT OfSCRIPTION ANO PM08A8LE CCNSECUENCES h a 2 lAt 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on 2/21/81 while preparing for plant startup, a Reactor Coolant System l g l(RCS) leak initially calculated at 0.5 GPM was discovered. After a subsequent RCS l o A [ inventory yielded a leak rate of 2.7 GPM, a plant cooldown was comnenced at 0100 l

[TTip lhou'rs on 2/22/81. At 1100 hours0.0127 days <br />0.306 hours <br />0.00182 weeks <br />4.1855e-4 months <br />, the leak was identified at the weld where the l FITe1 I[RC-Ill valve nipple penetrates the RCS boundarv. The public health and safety was l lo i r l l not affected since the leak develooed with the olant shutdown and was contained I g I within the containment buildinct. I 7 8 9 . 80 SYSTEM CAusE CAusE COMP. VALVE CoOE CooE SuscooE COMPONENT CooE susCooE sueCoot ITTTl F S IC la l@ l xl@ Iz l@ l zl zl zi zl zl zl@ l zi@ l zl@

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CAUSE OESCRIPTION AND CCRRECTIVE ACTIONS h li6o1IThe cause of the veld failure is unknown. To effect repair, a procedure was devised; ii,ig lwhere the RC-ll instrument line was cut off at the nipple between the RCS boundary l

, , land the veld crack, a plug was fitted, and then welded into place. The instrument I g l line was relocated at valve RC-28 of f of the B Loop hot leg. Work was completed on l i A I 3/7/81. A follow-up report will be sent as additional information becomes available.l 7 a 9 80

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Attachment To LER 81-14/OlT Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 The cause for the veld failure and the extent of this problem are not known at this time. A follow-up report will be sent addressing these questions as more information becomes available.

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