ML19343A655

Significant Deficiency Repts 369/80-19 & 370/80-14 Re Review of Piping Affecting Pipe Rupture Environ in Vital Equipment Areas.Main Steam Drain Lines Not Considered for Pipe Rupture Effects

ML19343A655
Person / Time
Site:	Mcguire, McGuire
Issue date:	11/14/1980
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8011190494
Download: ML19343A655 (3)

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DUKE POWER COMPANY l'OWER BUILDING 4.?2 Sot:Tri Citt: sten STnzr.T. Ciuitt.oTTE, N. C. .:ea4a i

ww'a o. a*a a r a. s a. November 14, 1980 ect Pats.otw, ickta-cNC. Aata 704 5 ta *noovction. 373 4c93 G

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Mr. James P. O'Reilly, Director *;- 5 U. ' S. Nuclear Regulatory Com:nission f.,, [ ~.

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101 Marietta Street, Suite 3100 -hEA _, ,,' ;

Atlanta, Georgia 30303 = ni l4 d. En

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Re: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370

Dear Mr. ' Reilly':

Pursuant to 10CFR 50.55e please find attached Significant Deficiency Report SD 369/80-19, 370/80-14.

Ve r'truly youra,

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L.~ 6. Parker,Jr.f

/WilliamO. ccuk .

LJB:scs Attachment cc: Director T. J. Donat 0ffice of Inspection and Enforcement NRC Resident Inspector U. S. Nuclear Regulatory Commission McGuire Nuclear Station Washington, D. C. 20555 olf g$ / I g o , , ,,9 g - - _

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DUKE POWER COMPANY McGUIRE NUCLEM STATICH s'

REPORT NO. 50 369/80-19, 370/80-14 REPORT DATE: !!ovember 13, 1c80 FACILITY: McGuire Nuclear Station - Units 1 &2 (CENTIFICATION OF DEFICIENCY:

Review of piping af fecting pipe rupture environment in vital equipment areas.

DESCRIPil0N OF DEFICIENCY:

Curing a review cf piping for the analysis of pipe rupture ef fects for Catawba Nuclear Station, it was determined that tne main steam drain lines at McGuire Nuclear Statirn were not considered for pipe rupture e f fects. The main steam drai- linas are moderate energy, small dianeter piping for all portions loc .ed within the Auxilicry Building.

DESIGNATION OF APPARENT CAUSE OF DECIFIENCY:

Previous reviews of piping had considered only the effects of that portion of piping which i s high-energy; (i.e. from the Main Steam line to the drain line control valve in the Doghouse). Those effects were enveloped by post-ulated ruptures in other piping such s Main Steam and Main Feedwater. The moderate energy portion of the Main Steam drain lines must also be considered for pipe rupture ef fects since they are requi red for all plant normal operating modes except cold shutdown.

ANALYSIS OF SAFETY iMPLICATICNS:

The Main Steam (SM) drain lines originate from tne Main Steam lines in the Doghcuses and pass thrcugh the Electrical Penetration area, Auxiliary

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Feedwater Pump rocm and Battery room of the Auxiliary Building to the Condenser connections in the Turbine Building. 1he SM drain lines are small diameter, non-seismic Class G piping. Postulated rupture and loss of the piping within the Auxiliary Building could have resulted in an environment more severe than that for which the safety-related equipment is qualified.

CORRECTIVE ACT ION:

The specific problem of the SM drain lines was resolved by rerouting the lines from the Doghouse, across the roof of the Auxiliary Building and to the Turbine Building. This routing separated, by remote location, the potential pipe ruptures from the safety related equipment areas.

For the general problem, we have reviewed all high and moderate energy piping for McGuire to assure that pipe rupture effects were properly considered, in acdition, for all nuclear power plants under design, .,.,

review periods have been established to assure review of all high and moderate energy piping for pipe rupture effects and identify changes to systems that may affect pipe rupture analysis.

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