ML20009C208

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Forwards LER 81-006/03L-0.Detailed Event Analysis Encl
ML20009C208
Person / Time
Site: Oconee Duke Energy icon.png
Issue date: 05/08/1981
From: Parker W
DUKE POWER CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009C209 List:
References
NUDOCS 8107200377
Download: ML20009C208 (2)


Text

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OFFICIAL COPY USNRC REGION -

DUKE POWER COMPANTL ANT 4, gy -,yf Powzu Dun.Dtwo 422 Sourn Cnuncu Sruzzr, Cruatorig N} . C.ll2824a d MAY AS: l0 W I L LI AM Q. PA R M ER, J R.

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14 U /- O K Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission

,M9-M' 2

Region II 101 Marietta Street, Suite 3100 ,

,h r 7 Atlanta, Georgia 30303

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Re: 0conee Nuclear Station 2 JUL 171981*

4 Docket No. 50-270 g ug,7 D, 3

Dear Mr. O'Reilly:

M Y.

Please find attached Reportable Occurrence Report RO-270/81-06. 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 condition for operation, and describes an incident which is e considered to be of no significance with respect to its effect on the health and. safety of the public.

Very truly yours, William O. Parker, Jr. I JLI:dj s l

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, California 94303 l

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! 8',07200377 810508 Mi i A

' PDR ADOCK 05000270 S PDR

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.,7e DUKE POWER COMPANY OCONEE UNIT 2 REPORT NUMBER: R0-270/81-06 REPORT DATE: May 8, 1981 OCCURRENCE DATE: hpril9,1981 FACILITY: Oconee Unit 2, Seneca, South Carolina IDENTIFICATION OF OCCURRENCE: Failure of Valve 2PR-8 to Open During ES On-Line Testing.

CONDITIONS PRIOR TO OCCURRENCE: 100% FP DESCRIPTION OF OCCURRENCE: At 0930 on April 9,1981, valve 2PR-8 failed to opea during on-line ES testing. Valve 7PR-F was locked closed until valve 2PR-8 was repaired and tested operable at 1858 on April 9, 1981. The closing of valves 2PR-7 and 2PR-8 isolated radiation Monitors 2 RIA-47, -48, and -49. This constitutes operation in a degraded mode per Technical Specification 3.1.6.8 and is thus reportable pursuant to Technical Specification 6.5.2.1.b.(2).

APPARENT CAUSE OF OCCURRENCE: Valve- 2PR-8 failed to open due to a faulty valve operator diaphragm.

ANALYSIS OF OCCURRENCE: Technical Specification 3.1.6.8. requires that two means of different operating. principles shall be operable for detecting reactor coolant leakage when the reactor is critical and above 2% power with one of the systems sensitive to radioactivity. The system sensitive to radioactivity u.ay be out of service for 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> if there are two other means to detect leakage operable.

While RIA's 47, 48, and 49 were out of service, the above requirement was met by operability of the normal RB sump level indicator and the means described in Technical Specification 3.1.6 Bases Section d. Since 2PR-8 failed closed and 2

2PR-7 was locked closed, the R.B. isolation was not degraded by this incident.

Therefore, the health and safety of the public were not endangered.

CORRECTIVE ACTION: Valve 2PR-7 was locked closed until valve 2PR-8 was declared operable. Valve 2PR-8 was cepaired and verified operable at 1858 on April 9, 1981.

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