ML19256G140

LER 79-039/01T-0:on 791130,engineering Review Per IE Bulletin 79-02 Identified 16 Supports Associated w/1-inch Control Rod Driveline Insert & Withdrawal Piping as Not Being Seismically Qualified.Caused by Inadequate Design

ML19256G140
Person / Time
Site:	Peach Bottom
Issue date:	12/14/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256G136	List: 05000278/LER-1979-039, Forwards LER 79-039/01T-0 05000278/LER-1979-039-01, /01T-0:on 791130,engineering Review Per IE Bulletin 79-02 Identified 16 Supports Associated w/1-inch Control Rod Driveline Insert & Withdrawal Piping as Not Being Seismically Qualified.Caused by Inadequate Design
References
LER-79-039-01T, LER-79-39-1T, NUDOCS 7912270510
Download: ML19256G140 (1)

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" ls LL_J @Sil0 l5 l ooc 013(ET-lNUMSER 012 17 186tl l@l1l1 3 l o l 7 19 l@ll_j li lh 17 l 9 k) H0 S 60 49 EVENT DATE F4 M REPORT DATL EVENT DESCRIPTION AND PRO 8ABLE CONSEQUENCES h o 2 l An engineering review of vendor design associated with Bulletin 79-02 j o l identified a total of 16 supports associated with Unit 31" CRD insert . .)

@ l and withdrawal piping as not being seismically qualified. A review indi- 1 o s cates that the lines involved would not break during a seismic event and _]

lois! l if a failure occurred the CRD system would operate within design limits. I g I I

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lil0ll The design difficiency was a result of inadequate initial de- I g,, p,j l sign. For the 16 supports identified, appropriate structural members 1 7 g l were reinforced and some additional members installed to elistinate any I

] l overstressed condition during a seismic event. All modifications were I g,m c1 A,ed by 12/11/79 prior to the Unit 3 startup. j so 9

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