ML19330B100

Significant Deficiency Repts 50-369/80-09 & 50-370/80-08 Re Solenoid Valves.On 800627,diesel Generator Instrument Air Pressure Observed Lower than Normal.Caused by Leaking Vent. Valve Stroke to Be Modified or Coils Replaced

ML19330B100
Person / Time
Site:	McGuire, Mcguire
Issue date:	07/25/1980
From:	Donat T DUKE POWER CO.
To:
References
NUDOCS 8007300330
Download: ML19330B100 (2)

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DUKE POWER COSIPANY Powra Dt;ttoxxo 422 SocTu Cnuncu Srazer. Caunt.oTTz, N. C. 20a42 w n.uw o. ma a n c a. s a. July 25, 1980

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Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 i

Atlanta, Georgia 30303 i Re: McGuire Nuclear Station Units 1 and 2 Docket No. 50-369 and 50-370

Dear Mr. O'Reilly:

Pursuant to 10CFR 50.55e please find attached Significant Deficiency Report SD 369/80-09, 370/80-08. l l

'Very truly yours I '

f a

William O. Parker, Jr.

LJB:ses Attachment

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cc: Director Mr. T. J. Donat Office of Inspection & Enforcement NRC - McGuire Nuclear Station U. S. Nuclear Regulatory Commission Washington, D. C. 20555 ,

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DUKE POWER COMPANY MCCUIRE NUCLEAR STATION Report No: SD-369/80-09, 370/80-08 Report Date: July 25, 1980 Facility: McGuire Nuclear Station, Units 1 and 2 Identification of Deficiency: Diesel Generator Instrument Air System Solenoid Valve Deficiency Description of Deficiency:

On June 27, 1980, Duke Power personnel J. R. Wells, R. E. Miller, and J. K. Berry reported by telephone to Mr. John Rausch of the NRC, Atlanta, the folicwing deficiency.

After completion of 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> Engineered Safety Features (ESF) testing operation of Diesel Generator IB, the diesel was shutdown.and immediately a blackout restart was initiated. Shortly thereafter, the diesel generator instrument air pressure was observed to be lower than the normal 125 psig. Source of problem was determined to be a leaking vent solenoid valve IVGSV5173-B which had not closed as 1. should on restart signal due to insufficient coil " pull in" strength after prolonged service.

Analysis of Safety Implication:

All safety related applications for these Valcor valves have been evaluated.

Four of these valves are used in each diesel generator instrument air system.

Potential failure of these valves could preclude proper operation of the diesel generator.

Corrective Action:

Valve deficiency will be corrected by Valcor by-modifying valve stroke and/or replacing existing solenoid coils with stronger coils.

These modifications will be completed on Unit l'by September 2, 1980 and on Unit 2 by January 1, 1981.

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