05000269/LER-1981-010, Forwards LER 81-010/03L-0.Detailed Event Analysis Encl

Forwards LER 81-010/03L-0.Detailed Event Analysis Encl

ML20009F509
Person / Time
Site:	Oconee
Issue date:	07/02/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F510	List: 05000269/LER-1981-010, Forwards LER 81-010/03L-0.Detailed Event Analysis Encl 05000269/LER-1981-010-03, /03L-0:on 810602,turbine Driven Emergency Feedwater Pump Declared Inoperable.Caused by Governor Valve Sticking in Open Position Due to Sys Contamination.Linkage Pin Removed,Governor Valve Freed & Stem Cleaned
References
NUDOCS 8107310252
Download: ML20009F509 (2)

LER-1981-010, Forwards LER 81-010/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
2691981010R00 - NRC Website

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C DUKE POWER CO>IPANY PowEn Uc LD No 422 SocTu Cucacu STHEET, CHAHl.OTTE, N. C. 20242

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July 2, 1981 272-'c82

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l Mr. James P. O'Reilly, Director N

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U. S. Nuclear Regulatory Commission

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Q 101 Marietta Street, Suite 3100 6-g JUL 3 01981 *

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,,s aw mamoa E Re: Oconee Nuclear Station Docket No. 50-269 h

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Dear Mr. O'Reilly:

O Please find attached Reportable Occurrence Report R0-269/81-10. This report is submitted pursuant to (.conee Nuclear Station Technical Specification 6.6.2.1.b(2), which concesns operation in a degraded mode permitted by a j

limiting condition'for operation, and describes an incident which is con-sidered to be of no signiff.cance with respect to its effect on the health l

and safety of the public.

V [y truly yours, I

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[ William O. Parker, Jr:cj.I h y _

i JLJ:pw Attachment 1

cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center

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U. S. Nuclear Regulatory Commission P. O. Box 10412 l

Washington, D. C.

20555 Palo Alto, CA 94303 l

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8107310252 810702 PDR ADOCK 05000269 S

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DUKE POWER COMPANY OCONEE UNIT 1 Report Number:

R0-269/81-10 Report Date:

July 2, 1981 Occurrence Date:

June 2, 1981 Facility:

Oconee Unit 1, Seneca, South Carolina Identification of Occurrence:

Turbine Driven Emergency Feedwater Pump Declared Inoperable.

Conditions Prior to Occurrence:

100% FP Desc-iption of Occurrence: At 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br /> on June 2, 1981, the turbine driven emergency feedwater p. imp (TDEFWP) was declared inoperable after the governor valve on the turbine was discovered stuck in the open position.

The linkage pin was removed and tha valve scs found to be stuck in the governor valve bushing.

This constitutes oper' tion in a degraded mode per Technical Specification 3.4.1.c and is thus reportable pursuant to Technical Specification 6.6.2.1.b(2).

Apparent Cause of Occurrence:

The apparent cause for the sticking of the governor valve was contamination of the system. After cleaning, the stem would ride freely in the bushing.

Analysis of Occurrence:

Technical Specification 3.4.1.c states if one EFW pump or EFW flow path is inoperable, restore it to operable status within 60 hours6.944444e-4 days <br />0.0167 hours <br />9.920635e-5 weeks <br />2.283e-5 months <br />.

The TDEFWP was restored to operable status well within the time permitted. Also I

during the period of inoperability of the TDEFWP, the MDEFWP's were operable.

Thus, the health and safety of the public were not affected.

l

Corrective Action

The linkage pin was removed and the governor valve was freed.

_The stem was cleaned with emory cloth and lubricated. The linkage pin was re-installed and the valve stroked.

The periodic test will include a step for verifying the position of the governor valve after the test.

A drain with a steam trap will be installed between valves MS-93 and MS-94.

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