ML19351E656

LER 80-084/01X-1:on 801113,water Leak Discovered from 2- Inch Reactor Vessel Drain Line.Caused by Faulty Weld.Weld Isolated & Ground Out.Coupling Rewelded

ML19351E656
Person / Time
Site:	Pilgrim
Issue date:	11/28/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351E655	List: ML19351E654 ML19351E656
References
LER-80-084-01X, LER-80-84-1X, NUDOCS 8012100576
Download: ML19351E656 (2)

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Iitilla m iner. 1ssistine in the rannir. deteered sine ia.clustens in the vald. Se I 1, ! : t lpresence of this slar oredestined failure of the veld. This failure is the result I I,i3l Iof a fabri. cation defect durdne constr.2ction. _ l It 141 l I 7 ea so A 4 POWER OT54[R $7ATUS ISCO MY DISCCVEMY CESCRIPTION It iS I dh I 01 11 olh!

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BOSTON EDISON CCMPA.W

! PILGRIM WCLEAR POWER STATION

! DOCKET NO. 50 - 293 Attachment to LER 80-084/01X-1

On November 13, 1980, operating personnel observed leakage in the drywell.

j A closer inspection revealed that a socket weld coupling had failed. The j reactor was shutdown until repairs could be performed.

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j' Weld number B-4-77 RI on a 2" socket weld coupling connection to a 2" Sched-ule 80 pipe on the Reactor Water Cleanup System located at approximately the .

40 foot level in the drywell failed. The 2" stainless steel pipe was re-j paired using a PNPS approved welding procedure. A liquid penetrant examina-cion was performed prior to excavating the area of the failure. The excava-tion extended to witbin approximately .025 inches of the interior wall. A

,I filler veld was than performed consuming the remaining beckup material to ensure a sound weld and enable sufficient penetration. Prior to acceptance of the weld, a final visual _and liquid penetrant examination and a 950 psi

); hydrostatic test were performed.

In addition to inspections and repairs of the failed weld a liquid penetrant i e - 4= tion was performed on the opposite end weld of the socket coupling.

No degradation of this weld was detected. ,

A level three inspector observed slag inclusion in the weld material during '

excavation of weld 3-4-77RI which is believed to be the primary cause of this event.

This failure was caused by a fabrication defect during construction and is

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not the result of~ thermal stress induced corrosion. ,

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