ML17275A975

Final Rept Re Steam Tunnel Support Box Beams,Initially Reported on 801114.Concludes That Condition Is Not Reportable Since Beams Are Structurally Sound to Perform Intended Function

ML17275A975
Person / Time
Site:	Columbia
Issue date:	03/27/1981
From:	Matlock R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55E, 10CFR-50.55E, G2-81-66, GO2-81-66, NUDOCS 8104090596
Download: ML17275A975 (8)

Text

REGULAY INFORMATION OISTRIBUTII/SYSTEM (RIBS)

ACCESSION NBR!8104090596 DOC ~ DATE: 81/03/27 NOTARIZED: NO DOCKET' FACIL!50<<397 BYNAME INPPSS Nuclear ProJecti Unit 2~ Hashington Public Powe 05000397 A'UTH AUTHOR AFFILIATION MATLOCK<R,G, Washington Public Power Supply System RECIPBNAME RECIPIENT AFFILIATION ENGELKENER ~ HE Region 5E San Franciscog Office" of the Dfrector SUBJECT! Final rept re steam tunnel support box beamsginitially reported on 801114.Concludes that condition is, not reportable since beams ate structually sound to perform intended function ~

DISTRIBUTION CODE: 8019S COPIES RECEIVED:LTR ENCL SIZE!:

TITLE: Construction Deficiency Repor t (10CFR50 ~ 55E)

NOTES;PM: 2 copies of all material. 05000397 RECIPIENT RECIPIENT COPIES

'I ID CODE/NAME 06'OPIES LTTR ENCL ID CODE/NAME LTTR ENCL ACTION! A/D LICENSNG OQ 1 1 YOUNGBLOODpB 05 1 1 RUSHBROOKEM ~ 1 1 LYNCHED'7 1 1 INTERNAL: ASLBP/JRHARD 1 1 D/DIR HUM FAC15 1 EDO 3, STAFF 19 1 1 EQUIP QUAL BR11 1 1 HYD/GEO BR 22 1 1 I It E 09 1 1 LIC QUAL BR 12 1 1 MPA 20 1 1 NRC PDR 02 1 1 OELD 21 1 1 PRO RE V 13 1 1 QA BR 10 1 1 G F IL 01 1 1 RUTHERFORDPRIE 1 1 DS DEV 21 1 1 EXTERNAL: ACRS 16 16 16 LPDR 03 NSIC 08 1 1 APR 1g lm)

T(OTAL NUMBER OF COPIES REQUIRED! LTTR 3f ENCL 3f

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Washington Public Power Supply System A JOINT OPERATING AGENCY P.O. I3OX 968 3000 GEO. WASHINGTON WAY RICHLAND,WASHINGTON 99352 PHONE (509) 312 5000 March 27, 1981 Docket No. 50-397 G02-81-66 U. ST Nuclear Regulatory Commission NRC Region V Suite 202, Walnut Creek Plaza 1990 N. California Blvd.

Walnut Creek, California 94596 Attention: Mr. R. H. Engelken Di,rector

Subject:

WPPSS NUCLEAR PROJECT NO. 2 POTENTIALLY REPORTABLE CONDITION 10CFR50.55(e)

STEAM TUNNEL SUPPORT BOX BEAMS

Dear Mr. Engelken:

Your staff was previously informed by telephone on November-"14, 1980 of' "Potentially Reportable" condition regarding linear indications in the Steam Tunnel Support Box Beams. An interim report was submitted via our letter, G02-80-,296, dated December 15, 1980.

Attached is our final report describing the evaluation of the condition. Our conclusion is that the subject condition is not if there reportable'lease contact us are any questions.

Very truly yours, Program Director, WNP-2 cph

Attachment:

Final Report cc w/att: CV. Stello - NRC AD Toth - NRC Resident Inspector RC Root - 88R Site TA Mangelsdorf - Bechtel Site

$ 50/>

RE Snaith - B8R JJ Verderber - B8R M. Izaak - WPPSS, N.Y.

I/i WS Chin - BPA WNP-2 Files

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Final Report POTENTIALLY REPORTABLE CONDITION WPPSS NUCLEAR PROJECT NO. 2 STEAM TUNNEL SUPPORT BOX BEAMS WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 LICENSE NO. CPPR-93 Potential Problem and Reference Notification During field erection, linear indications were discovered in a double bevel web to flange weld. This weld is in a box beam for a pipe whip restraint in the main steam tunnel. Two beams were involved.

Depending on the size and location, such an indication could affect the load carrying capacity of the beam, which in turn could affect the performance of the pipe whip restraint.

The NRC was notified of this potential problem on November 14, 1980.

A roach to Resolution of the Problem In order to evaluate the nature and extent of the indications, a physical destructive examination of one of the beams was performed.

This examination failed to show any further indications either visually or by M T.

All other beams with similar weld configurations were examined thoroughly by U.T. A linear indication was found by this method in one of the beams.

Final Resolution The results 'of examinations on all beams has shown only two general deficiencies, a linear indication of approximately 15" in the end of one beam and a slightly undersize weld due to lack of fusion in most of the welds of all beams.

The undersize weld problem has been satisfactorily resolved by examining the stress levels in the beams.

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Attachment Page 2 of 2 To examine the linear indication, a 2-inch thick piece was removed from the end of beam MK-321-81. Two slag inclusions and a non-fusion type slag associated with the design non-fusion area between the vertical web and the flange were detected by both physical and liquid penetrant methods.

Because of their size (less than 1/16"), the two slag inclusions are not structurally significant. The defect associated with the design non-fusion area has been analyzed by the Burns and Roe Engineering Department. Based on the weld metal available at the web-flange joint, it has been established through analytical design that the joint is structurally sound and able to perform its intended function.

Conclusion The condition is not reportable since the beams will still perform their intended function, with no effect on safety of operations during the expected life of the plant.

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