ML19294C255

LER 80-008/01T-0:on 800215,during Insp for IE Bulletin 79-14,discovered Nine Pipe Clamps Installed W/O Restraining Welded Lugs.Caused by Oversight During Const.Welded Lugs to Be Installed

ML19294C255
Person / Time
Site:	Oyster Creek
Issue date:	02/29/1980
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19294C252	List: ML19294C250 ML19294C255
References
IEB-79-14, LER-80-008-01T, LER-80-8-1T, NUDOCS 8003070378
Download: ML19294C255 (3)

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14 7b REPORT C ATE EO EVE!.' DESCRIPTION AND PROBABLE CONSEQUENCES h 0 :: I On February 15. 1980. durine the insoection recuired for IE Aulletin I c is i 79-14, nine pipe clamps were discovered improperly installed. The clamn I c 6 .: i ] s which connect the snubbers to the isolation condenser nipina were not  !

is  ; restrained by welded lugs. The snubbers, as referenced on Sercen-Patter- I

e! i son drawing are numbered 632R1, 632R2, 632R3, 632R4, 632R7. 633R1, 633R2. 1

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Macson Avenue at Pant" 506. Road Mo nstown, New Je sey 07960 (20" ~55-8200 OYSTER CREEK NUCLEAR GENERATING STATION Forked River, New Jersey 08731 Licer.see Event Report Reportable Occurrence No. 50-219/80-8/IT Recort Date February 29, 1980 Occurrence Date February 15, 1980 identification of Occurrence During verification of as-built conditions for piping hangers, it was noticed that nine (9) pipe clamps on piping to the isolation condensers were not pro-perly installed.

This event is considered to be a reportable occurrence as defined in the Techni-cal Specifications, paragraph 6.9.2.a. (9) .

Conditions Prior to Occurrence The plant was shutdown for a refueling / maintenance outage.

The reactor was subcritical.

The reactor mode switch was locked in refuel.

The cavity was flooded.

Description of Occurrence On Friday, February 15, 1980, during the inspection required for IE Bulletin 79-14, nine pipe clamps were discovered improperly installed. The clamps which connect the snubbers to the isolation condenser piping were not restrained by welded lugs.

The snubbers, as referenced by Bergen-Tatterson Drawing, are numbered:

632R1 633R1 632R2 633R2 632R3 633R3 632R4 633R4 632R7 Je se. Cem a Powe 2. L;n Compan, it a Memoe of tne Gene a :.c': umes system

F.e:c ta:le Occurrence No. 50-219/SO-8/1T Page 2 Fe:reary 29, 198J A:carent Cause of Occurrence The weld lugs were not installed during plant construction.

Analvsis of Occurrence The snubbers are attached to the pipe clamps in three different methods. One method is connecting the snubber line of direction through the center line of the pipe. Inis method does not require welding of clamp to the pipe because no sliding can occur. The other methods of attachment are axial and torsional.

These two methods require welding of the clamp to the pipe because there would be a ;0ssibility of the clamp sliding during a seismic event.

The pu pose of tne Isolation Condenser System is to depressurire the reactor anc to rencve reactor decay heat in the event that the turbine generator and main conde'ser are unavailable as a heat sink. The system consists of two loops, each ca:able of accomplishing the purpose of the svstem.

If a seismic event would have occurred, the pipe restraint may not have functiored as recuired.

Corrective Action The nine clamps will be prevented from sliding during a seismic event by attach-ing welded lugs to the piping. The lug placement has been determined by a Burns G Roe review and approved by Generation Engineering.

Failure Data Not applicable.

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