ML20052G138

LER 82-008/01T-0:on 820422,during Refueling Outage,Leak Repair Procedures on Valve SI-13B Revealed Significant Boric Acid Corrosion Wastage of body-to-bonnet Bolts.Caused by Bolt Degradation.Affected Bolts Replaced

ML20052G138
Person / Time
Site:	Kewaunee
Issue date:	05/06/1982
From:	WISCONSIN PUBLIC SERVICE CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052G136	List: ML20052G135 ML20052G138 ML20052G140
References
LER-82-008-01T, LER-82-8-1T, NUDOCS 8205140344
Download: ML20052G138 (1)

Text

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RE ' ORT DATE E. VENT DESCRIPTION AND PROBA0LE CONSEQUENCES h o 2 l During the 1982 refueling outage, leak repair procedures on valve SI-13B (cold leg i

o j 3,  ; SI check valve) revealed significant boric acid corrosion wastage of the body-to- l lo la I l bonnet bolts. Valve failure did not occur. therefore, there was no safety signifi- I to Isl I cance. This is reportable as a discovery of a safety related component reauirina I

[o Ic l 1 corrective measures to prevent the existence. or develooment of an unsafn condition I

[o l 21 l (T.S.6.9.2.a.(9)). There was no effect on public safety or nlant operation. l

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JS 36 40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS li j o j l Bolt degradation was caused by boric acid induced corrosion wastage. All bol ts. on l l3 lij l this valve were visually inspected and the affected bolts ' replaced in kind. 'A I

,, , ., , l similar occurrence was reported under LER 81-08 and LER 82-07. Investigation is I g l continuing to determine what corrective actions are necessary. I 11 141 I l

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