ML19270H431

RO 3-79-23/1P on 790724:anchor Support on Emergency Svc Water Piping in RHR Room Failed.Apparently Caused by Improper Installation.Anchors & Bolts Replaced & Satisfactorily Tested

ML19270H431
Person / Time
Site:	Peach Bottom
Issue date:	07/25/1979
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
References
NUDOCS 7908130461
Download: ML19270H431 (2)

Text

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- 2-PHILADELPHTA EJ.ECfRIC COMPANY .

Peach Bottone Atouic PoEscr Station- * *-

Delta. Pennsylvania.

17314 July 25, 1979 Mr. Boyce H. Griwr Office of Inspectiers and Enforcewma Regiort 1 United. States Nucleme Regulatory Commiessionc .

631 Park Avenue King of Prussia, PA 19406 -

SUEJECT: REPORTABEE OCCURRENCE - P310FT NETTIFICATIDN; ,

Confirming W. T. Ut 11 rich's c'onversation with. Mr. Csqpisteet,. Region 1 United States Nuclear Regulatnry Commissiorm on. July 25, 1979.

Reference- Docket No. 50 .'I76 Peach Bottous' Unit 3 Technical' Specification.

Reference:

6.9.2.a(9)

Report No. 3_79-23/IP' - -- -

Occurzence Date. July 2% 1979 Identificaticem of Occurrencec Failure of enchor support arr emergency service watem piping. in 35 MHit rope.

The above failure was idenelified a+ a resutt of a piping. support inspeer.Lorm progran being conducted in accordance with IE Bulletin: 79-07. Thi$

laspectiort identified one bolt on a four anchor support pisste *Aich would not torque property. Additf orrally,, one bolt wasJ found with a ~ cracked head.'

Failure of these twon boltw cet one support piare has: been, evaluated as a support failure.,

4 parent. Cause:: M Wmng- -

Impropen insextlatiors. E . ;h_ _;.,

Analysis of Occurrence::

ne supporte pisec ar4 horst wh6sh, fakled werer part: of an cuergency sesvice water line piping support The energency seruvice water line (3" disuserer) is associated wi.thi rooms cooler.w in the Unit J 'B' RH2 room. Thee piping involved is orr the outlet side of the room coo-ter. Possible fai leste of~

this pipe during a seismic. event could Iwad to floodi,ng of one RHR room.

Probability of such an occurrence appears to be very Acass.

2379 067 7908130 %

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Corrective Action -

Thr two failmt anchors- and t>olts have been replaced AII four bolts Ier this assemb4 9 c werer satisfactedsy torque tested.. Corrective action is couplete Previous FaElures::

2-79-33/IP 2-79-3F/IP 3-79-19/1P g_

J-79-25/1F ,

Very truly your s

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W T. Ullrisch+ Superknemndent:

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