ML20202B148

ISI Plan for Second Ten-Yr Interval at Bvps,Unit 2,Relief Request BV2-B1.11-1,Rev 1, Re Rv Lower Circumferential Weld (2RCS-REV21-C-4)

ML20202B148
Person / Time
Site:	Beaver Valley
Issue date:	10/03/1997
From:	Legrand R DUQUESNE LIGHT CO.
To:
Shared Package
ML20202A937	List: L-97-067, Requests NRC Review & Approval of Proposed Relief Requests Applicable to Plant,Units 1 & 2 10-yr ISI Programs.Listed Revised & Proposed Relief Requests,Encl ML20202A955 ML20202B134 ML20202B148 ML20202B162 ML20202B175 ML20202B251
References
NUDOCS 9712030064
Download: ML20202B148 (2)

Text

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2TYPP.I INSERVICE INSPECTION PLAN FOR THE FIAST TEN. YEAR. INTERVAL AT BEAVER VALLEY POWER STATION UNIT #2 RELIEF REQUEST EV2 Bl.11 1, REY.1

SUBJECT:

Reactor Vessel I.4wer Circumferential Weld (2 RCS-REV21-C-4)

Prepared by:

" ' ED8 Date: b ' I $~'I 7 Supenisor, Nuclear Programs Redewed by Date: '~' f!EF 77 Director, Design Basiging!'neering Reviewed by: Date:

ANil (/

Reviewed by: BV OSC-E97 Date: 9/10/97 OSC Reicwed by: kNt04Pt.CM9(btSuSe97-k Date #[24bT i

4 ORC Approval by: /I ,, . . .,~ Date: /C- ?- 9 )

Div, VP, Nuclear Operations / Plant Manager 9712030064 971124 PDR ADOCK 05000334i G. PDR i..

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DUQUESNE LIGHT COMPANY i

Beaver Valley Power Station Unit No. 2 l

RELIEF REOUEST NO. BV2 Bl.11-1. Rev.1 l COMPONENT Reactor Vessel Lower Head Circumferential Weld (2RCS REV21-C-4)

DRAWING NO.

10080-ISI E !A ASME SECrlON XI REOUIREMElyT (83S83)

Item No. Bl.11 (IWB 25001, Category B.A) requires volumetric examination of essentially 100% of the weld length each 10 year interval. l BASIS OF RELig In accordance with 10CFR50.55a(g)(6)(i), reliefis requested on the basis that compliance with the Code requirement is impractical. The lower head to shell weld (2RCS-REV21-C-4) examination is limited due to the four core support lugs.

This weld was examined udng automated techniques during the 2R06 refueling outage. Over eighty nine percent (89%) of the require I volume was examined. The four lugs are welded to the inside surface of the reactor vesseljust above weld 1RCS REV21-C-4.

ASME XI defines " essentially 100%", as more than 90 percent of the examination volume. To obtain the l last 1% of the required volume would necessitate removal of one of the support lugs. Removal of a support lug for this purpose is considered impractical.

AJ '.ERNATIVE EXAMINATION

.he alternative to the examination requirement is to perform the examination to the maximum extent possible. This examination is supplemented by the visual examination performed on the interior of the vessel. The four support lugs are included in this examination. Therefore, the UT examination coupled with the visual examination of the support lugs and the surrounding areas provides an adequate measure of assurance of the integrity of this weld.

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