ML19256F253

LER 79-035/03L-0:on 791109,RHR Svc Water Line Supports Found W/Safety Factor Less than Two.Containment Cooling Loop Declared Inoperable.Caused by Design Deficiency.Supports Modified for Factor Above Four,Loop Returned to Svc

ML19256F253
Person / Time
Site:	Quad Cities
Issue date:	11/30/1979
From:	Leech K COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19256F239	List: ML19256F238 ML19256F253
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912180370
Download: ML19256F253 (1)

Text

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7 60 61 DOCKET NUMB ER EVENT DATE 74 75 41 0 EVENT DESCRIPTION AND PROBADLE CONSEQUENCES h Rl While re evaluatina oipino restraints in accordance with NRC Bulletin 79-02 the I O 3 station was notified that RHR service water line (1-1005B-16") supports 1-1005B-H83 I I"O'T:i 1 I and H87 were found to have a safety factor of less than two. Subsequently the IB RHR i O s containment cooling loop was declared inoperable and the guidelines of Technical l 0 s l Specification 3.5.B.3 were placed into effect. l ITTT'l i I O 8 l l 7 8 9 80 E CODE SU8C E COMPONENT CODE SU8 COD'E SU E g l C l F l@ ]@ l Al@ l Sl Ul Pl 0l Rl Tl@ l A l@ lZ l@

7 8 9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION LER EVENT YEAR R EPORT NO. CODE TYPE N O.

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{ A g lGl2 5 l5 lg 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i o l The cause of this occurrence was design deficiency. Analyses of supports 1-1005B-H83 l l3 gi j l and H87, found the design factor of safety to be less conservative than originally l

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, , analyzed. The supports were modified such that their factors,of safety were greater ;

, 3 l than four and the ;I RHR Containment Cooling loop was declared operable at 11:15 AM g

on November 15, 1979 ,

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