05000254/LER-1979-035-03, /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

/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: 05000254/LER-1979-035, Forwards LER 79-035/03L-0 05000254/LER-1979-035-03, /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
References
LER-79-035-03L, LER-79-35-3L, NUDOCS 7912180370
Download: ML19256F253 (1)

LER-1979-035, /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

Event date:
Report date:
2541979035R03 - NRC Website

text

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60 61 DOCKET NUMB ER 68 69 EVENT DATE 74 75 REPORT DATE 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.

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s containment cooling loop was declared inoperable and the guidelines of Technical l

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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

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

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