05000287/LER-1981-010, Forwards LER 81-010/03L-0.Detailed Event Analysis Encl

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

ML20009C149
Person / Time
Site:	Oconee
Issue date:	06/16/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C150	List: 05000287/LER-1981-010, Forwards LER 81-010/03L-0.Detailed Event Analysis Encl 05000287/LER-1981-010-03, /03L-0:on 810517,broken Airline to Valve 3LPSW-525 Was Discovered.Caused by Breakage of Brass Nipple Between Air Supply Isolation Valve & Accumulator Tank.Brass Nipple Replaced
References
NUDOCS 8107200326
Download: ML20009C149 (2)

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

Event date:
Report date:
2871981010R00 - NRC Website

text

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DUKE POWER COMPANY Powra Dt :.uswo 422 SouTri Cittucu Starer. Ciunt.orTE. N. C. 2e24a

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June 16, 1981 3 7 3..o e s S:t Mr. James P. O'Reilly, Director U.S. Nuclear Regulatory Commission d

Region II h

I-I3 JUL l 7 Jggyu h 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 6 ug

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Re:

Oconee Nuclear Station

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Docket No. 50-287

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-287/31-10. This report is submitted pursuant to Oconee Nuclear Station Technical Specification 6.6.2.1.b(2),

which concerns operation in a degraded mode permitted by a limiting ecndition for operation, and describes an incident which is considered to be of no significance with respect to its effect on the health and safety of the public.

Ve truly yours,'

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A.Ly '

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William O. Parker, Jr. )

JLJ:pw Attachment cc: Director Mr. Bill Lavallee Office of Management & Program Analysis Nuclear Safety Analysis Center U.S. Nuclear Regulatory Commission P. O. Box 10412 Washington, D. C.

20555 Palo Alto, CA 94303 l

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8107200326 810616 PDR ADOCK 05000287 S

PDR

DUKE POWER COMPANY OCONEE UNIT 3 Report Number: R0-287/81-10 Report Date: June 16, 1981 Occurrence Date: May 17, 1981 Facility: Oconee Unit 3, Seneca, South Carolina Identification of Occurrence: Loss of One MDEFWP During Unt. Operation Conditions Prior to Occurrence:

100% FP Description of Occurrence: At 2115 hours0.0245 days <br />0.588 hours <br />0.0035 weeks <br />8.047575e-4 months <br /> on hay 17, 1981, a broken airline to valve 3LPSW-525 was discovered. Valve 3LPSW-525 is a solenoid controlled, cool-ing water valve to the "3B" Motor-Driven Emergency Feedwater Pump (MDEFWP). The "3B" MDEFWP was declared inoperable. This constitutes operation 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: This incident was due to the breakage of a brass nipple between the air supply isolation valve and the accumulator tank of 3LPSW-525.

Analysis of Occurrence:

Both the "3A" MDEFWP and the Turbine Driven EFWP were operable during the inc,perability of the "3B" MDEFWP. These pumps are capable of supplying sufficient feedwater flow to the steam generators in an emergency situation. Thus this incident was of no significance with respect to safe ope-ration, and the health and safety of the public were not affected.

Corrective Action

The immediate corrective action, replacing the broken '"'ss nipple with a similar one, was effective in repairing the valve.