ML17275A607

Deficiency Rept Re Large Diameter Piping Found to Have Less than ASME Code Required Min Wall Thickness.Caused by Overgrinding While Preparing Weld Profiles for ASME Section 11 Inservice Insp.Contractors to Revise Procedures

ML17275A607
Person / Time
Site:	Columbia
Issue date:	09/16/1980
From:	Renberger D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:
References
10CFR-050.55E, 10CFR-50.55E, G2-80-202, GO2-80-202, NUDOCS 8009240465
Download: ML17275A607 (6)

Text

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ACCESSION NBR:8009240465 DOC ~ DATE! 80/09/16 NOTARIZ D! NO DOCKET FACIL:50-397 NPPSS Nuclear Projects Unit 2< Washington Public Powe 05000397 AUTH'AME AUTHOR AFFIL'I ATION REMBERGER.D/;/ Washington Public Power Supply System RECIP.NAME RECIPIENT AFFILiI'ATION

SUBJECT:

Deficiency rept re large dtaaeter pIptng tound to have leap+

than ASME'" code required min wall thickoess Caused by ~

overgrindj ng while pr coal ring weld profiles for ASME section 11 inservi ce insp.Cbntractors to revise procedures'019S DISTRIBUTION CODE! COPIES RECEIVED! LTR ~% ENCL, ~ SIZE:

TITLE: Constr uction Def iciency Repor t (10CFR50e5SE)

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Washington Public Power Supply System A JOINT OPERATING AGENCY 3000 Gco. w*sHiNorov wAv RicvLANo, w>IHwcroN QQ352 p~oNc (50Q) 375 5000

o. Box Q58 September 16, 1980 G02-80-202 Hr. R. H. Engelken, Director Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1900 N. California Blvd.

Walnut Creek, California 94596

Subject:

MPPSS NUCLEAR PROJECT NO. 2 Docket No. 50-397. CPPR-93 Re ortable Deficienc - 10CFR50.55 e)

Dear Hr. Engelken:

In accordance with the provisions of 10CFR50.55(e), your staff was informed by telephone on August 12, 1980, of a reportable deficiency relative to violation of the minimum ASHE Code wall thickness on large bore pipe.

Attached is our report on this deficiency.

Please contact us if you have additional questions.

Very truly yours, D. L. Renberger Assistant D';rector, Technology DLR/RPS/im Attachment cc: JR Lewis, BPA w/1 ND Lewis, EFSEC, Olympia w/1 RE Snaith, BRR w/1 V. Stello, NRC w/1 AD Toth, NRC w/1 JJ Verderber, BIER w/1 B. Wood, NUS Corp. w/1 WNP-2 Files 3 QOQQgo A)5'

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REPORTABLE DEFICIENCY AND CORRECTIVE ACTION WPPSS NUCLEAR PROJECT NO. 2 LARGE BORE ASME PIPING WITH LESS THAN RE UIRED MINIMUM WALL WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397

~ LICENSE NO. CPPR-93 Descri tion of Deficienc:

Large diameter piping has tqen found to have less than the ASME Code required minimum wall 'thickness. This underwall condition was caused by over-grinding while preparing weld profiles for ASME Section XI In Service Inspection (ISI) .

Safet Si nificance:

a If the underwall condition were. to be left uncorrected, it could result in the violation of piping pressure bounderies. This could adversely affect personnel safety and the safe operation of the plant.

Corrective Action:

Project Engineering Directive, PED-215-M-3337, has been issued to our mechanical contractor, which controls grinding, assures that wall thickness measurements are performed on all blended areas and directs the mechanical contractor to revise appropriate procedures accordingly.

A separate contract'issued to Lambert, McGill and Thomas Co. (C14402) directs them to measure the remaining wall thickness .of all previously blended ISI areas and to report the results to WNP2 Engineering. This data is being evaluated to determine the scope of the problem. Subsequent to this evaluation, individual areas will be repaired, as required, to conform to the ASME Code.

Completion of the physical re-work is estimated to be September, 1981.

This date is contingent upon the resolution of the current labor negotiations and the lifting of the Stop Work Orders effecting guality Class 1 work at WNP-2.

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