ML17275A845

Deficiency Rept Re Overloads on Supports for Spray Pond Piping,Initially Reported on 801114.Missing Axial Restraint Lugs Will Be Installed by Contractor

ML17275A845
Person / Time
Site:	Columbia
Issue date:	02/23/1981
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, GO2-81-30, NUDOCS 8103030786
Download: ML17275A845 (6)

Text

REGULATORY . ORMATION DISTRIBUTION SYS (RIDS)

ACCESSION NBR:8103030786 DOC ~ DATE! 81/02/23 NOTARIZED; NO DOCKET FACIL::50 397 NPPSS Nuclear Projects BYNAME Unit" 2~ Wash'ington Public Powe 05000397 AUTH AUTHOR A F F IL'IAT'I ON MATLOCKiR.G. Washington Public Power Supply System RECIP ~ NAME'ECIPIENT AFFIlIATION ENGELKENER ~ HE Region 5i San Francisco'ffice'f the Director SUBJECTS Deficiency,rept re overloads on supports for spray pond pipingiinitially reported on 801114,Missing axial restraint lugs will be installed by contractor.

DISTRIBUTION CODE: BOI9S COPIES RECEIVED;LTR 'NCL Q SIZE"

.Construction- Deficiency Repor t (10CFR50 55E') ~ 'ITLE" NOTES:PM: 2', copies of al l mater ial. 05000397 RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME) LTTR ENCL ID CODE/NAME LTTR ENCL' ACTION'/D LICENSNP 00 1 1 YOUNGBLOODRB 05 1 RUSHBROOKPM ~ 06" 1 1 LYNCHED'7 HAIK 1 1 INTERNAl: AD/RC D/OIR I/IE'7 HUM FAC15 1

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Washington Public Power Supply System A JOINT OPERATING AGENCY P.O. BOX 958 3000 GEO. WASHINGTON WAY RICHLAND,WASHINGTON 99352 PHONE I509) 372-5000 Docket No. 50-397, CPPR-93 February 23, 1981 G02-81-30 Nuclear Regulatory Commission Region V Suite 202, Walnut Creek Plaza 1990 North California Blvd.

Walnut Creek, CA 94596 Attention: Hr. R. H. Engelken, Director Gentlemen:

Subject:

MPPSS NUCLEAR PROJECT NO, 2 REPORTABLE DEFICIENCY - 10CFR50.55(e)

OVERLOADS ON SUPPORTS FOR SPRAY POND PIPING In accordance with the guidelines established for the reporting of 10CFR50.55(e) conditions, your staff was informed by telephone on November 14, 1980 of a "Potentially Reportable" condition regarding overloads on supports for spray pond piping. An interim report describing the deficiency and our approach to the resolution was submitted per G02-80-290, dated December 15, 1980.

The MNP-2 Project has completed its evaluation and has determined this condition to be reportable under the provisions of 10CFR50.55(e).

Attached is our report on this deficiency.

Please contact us if you have additional questions.

Ver'-'ruly your s, R. G. MATLOCK RGN:P"=P:cd Program Director, HNP-2 0 I (p

Attachment:

Deficiency Peport cc: llS Chin - BPA ND Lewis - EFSEC, Olympia V. Stello - NRC gas.'0 2 >98 'Bo/1 AD Toth - NRC Resident Inspector ~gQCC JJ Verderber - B8R NY VaS.~G

~ rGIAIAI55I0R 5 B. l"ood - NUS Corporation

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0 WPPSS NUCLEAR PROJECT NO. 2 C

REPORTABLE DEFICIENCY AND CORRECTIVE ACTION FOR THE OVERLOADS ON SUPPORTS FOR SPRAY POND PIPING WASHINGTON PUBLIC POWER SUPPLY SYSTEM DOCKET NO. 50-397 LICENSE NO. CPPR-93 Nature of Deficienc In reviewing the effect of new seismic loads on the Standby Service Water System, loads in excess of the design allowables for expansion bolts were identified in four of the pipe supports and axial restraint lugs were found missing at one support. These overloads were not a result of the revised seismic loads but due to the original hardware design.

Safet Si nificance Although the design margins for the expansion bolts were reduced, they were not eliminated. Failure of these bolts would not be predicted. In additio'n, the new flexible plate analysis shows that the stress in these bolts will not exceed the design allowable.

The maximum stress in the pipe was found to be above the yield strength of the material due to the missing restraint lugs. Although the amount of deformation predicted is small -and the stress is well below the ultimate strength of the material, the design margin has been eliminated. It is felt that due to any uncertainties that may exist, it is possible that the piping system might not be able to perform its intended function as a result of a seismic event. This could adversely affect the ability to safely shut down the plant i.f an active failure were to occur in the alternate Standby Service Mater loop.

Corrective Action E

A contractor has been directed to install the missing axial restraint lugs.

.This action reduces the calculated pipe stress to below the maximum ASt/E allowable.

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