ML19290F041

LER 80-005-031-0:on 800116,during Normal Operation,Two through-wall Cracks in Welds in Radiant Energy Conversion North Critical Loop Discovered.Caused by Intergranular Stress Corrosion.Welds Will Be Replaced

ML19290F041
Person / Time
Site:	Cooper
Issue date:	02/13/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19290F034	List: ML19290F033 ML19290F041
References
LER-80-005-03L, LER-80-5-3L, NUDOCS 8003170492
Download: ML19290F041 (1)

Text

• * , N EC F o R M 366

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$ $ l Ll@ l0 l5 10 10 10 l2l 9l 8 @69 l0 11 60 61 DOCKE T NUM8 E R 68 11 16 9Iol@ h bREPORT EVENT OATE 14 75 h 11 D ATE le In l@ 8f 3 EVENT DESCRIPTif)N AND PROB ABLE CONSEQUENCES h A [During normal operation, a routine tour of the plant indicated two through-wall g o 3 l cracks in welds in the REC north critical loop. This portion is isolatable from thel o 4 l south critical loop. The south critical loop and the redundant service water supplyj o s twere available. If the welds failed completely, they would be detectable. Reference l 0 6 lLER Recort Nos. 78-27 and 79-29 fg* ev_ents of similar nature. This event presented 1 oii Ino adverse consequences from the sT. .adpoint of public health and safety. I o 4 I l y g 9 60

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l@ l Alg 43 44 Jl0l3l5lg 47 CAUSE DESCRIPTf oN AND CORRECTIVE ACTIONS h o lThe component involved is a weld. The failure is a through-wall crack caused by in-i 1 Itercranular stress corrosion. The welds have been evaluated acceptable for con- I

, , ltinued service. During the next shutdown of suf ficient length the welds will be re ,

, 3 l placed. An analysis is continuing to determine future corrective action by General l L'Li] l Electric. An updated report will be submitted. l 7 e 9 so STA S '6PQWER OTHER STATUS DISCO RY OiSCOVERY DESCRIPTION 1 L Ld@ l d 4 i@l NA I Al@i '

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