ML19305E825

LER 80-009/03L-0:on 800329,during Refueling outage,through- Wall Crack Discovered on Upstream Side of Isolation Valve to REC Noncritical Header.Cracked Weld Characteristic of Intergranular Stress Corrosion.Weld Will Be Repaired

ML19305E825
Person / Time
Site:	Cooper
Issue date:	04/28/1980
From:	Doan P NEBRASKA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19305E823	List: ML19305E822 ML19305E825
References
LER-80-009-03L, LER-80-9-3L, NUDOCS 8005200482
Download: ML19305E825 (1)

Text

a NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION b 77) g LICENSEE EVENT REPORT f[p l CONTHOL BLOCK: l 1

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J d 60 61 68 D A TE EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o 12 l Fhile shutdown for refueling, a routine tour of the plant indicated a through-wall I io i3; prack on the upstream side of the isolation valve to the REC non-critical header. i lolal This weld is isolatable from the critical supply header and a redundant system is l 1 o I s i pvailable. If the veld failed Completely, it would be detectable. Reference LER Re- l Ia!sI bort 78-27. 79-29. 79-43. and 80-05 for events of shilar nature. This event pre- l 10 I 7 I konted no adverse consecuences f rom the standocint of oublic health and safetv. I Ialai l I

, g 3 80 SYSTEM CAUSE CAUSE COYP VALVE CCOE CODE SUSCODE COYPONENT CODE SUSCODE SL8 CODE lo191 is 1 Bl@ [E j@ l D l@ l P l I l P I E l X l XlQ4) lD[@ ] @

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IJ J4 35 J6 3/ 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS lilol[rhe component involved is a weld. The failure is a through-wall crack character- l l'It I listic of intergranular stress corrosion. Prior to startup the weld v'11 be repaired.I Iiia1(An analysis is continuing to determine future corrective action by General Electric.l 1 I l l l An undnted recort will be submitted. .j li14 1l 1 4 1 80 SA s . POWER OTHER STATUS ISC O RY DISCOVERY DESCRITTION 11 151 [li_j @ l 01 01 Ol@ l NA Operator Observation l l B l@l l AC TIVI TY CC(TENT aELEASED OF RELE ASE AVOUNT OF ACTIVITY LOC 2. TION OF RELEASE i' 16 I L;LJ @ LzJ@l NA I I NA I a 3 10 1i 44 45 90 PE R$ONNEL E w Ptj$URES Nu'pt E R TYPE DESCRIPTION l i l 'l 1010101@Lzj@l NA l PERsONNE L ,NJu'AES No,.

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