ML20040B699

Forwards LER 81-024/01T-0.Detailed Event Analysis

ML20040B699
Person / Time
Site:	Oconee
Issue date:	01/12/1982
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20040B700	List: ML20040B699 ML20040B707
References
NUDOCS 8201260330
Download: ML20040B699 (2)

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January 12, 1982 3 m ce3

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Mr. James P. O'Reilly, Regional Administrator 'I '

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U. S. Nuclear Regulatory Commission /' j Region II g 101 Marietta Street, Suite 3100 , ,-

At lanta , Georgia 30'3'03 i -

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Re: Oconee Nuclear Stat!on \- '

Docket No. 50-269 \

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Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-269/81-24. This report is submitted pursuant to Oconee Nuclear Station Technical Specifica-tion 6.6.2.1.a(5), which describes a component malfunction which prevents, by itself, the fulfillment of the functional requirements of a system required to cope with an accident analyzed in the Safety Analysis Report.

This report describes an incident which is considered to be of no signifi-cance with respect to its effect on the health and safety of the public.

Vepy truly yours,. l

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, u w lu u Will tam O. Parker, Jr.

JFK/php Attachment cc: Director Records Center Office of Management and Program Analysis Institute of Nuclear Power Operations U. S. Nuclear Regulatory Commission 1820 Water Place Washington, D. C. 20555 Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector Oconee Nuclear Station O m FICIAL CO O,,g,9 . .-

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DUKE POWER COMPANY OCONEE UNIT 1 Report Number: R0-269/81-24 Report Date: January 12, 1982 Occurrence Date: December 29, 1981 Facility: Oconee Unit 1, Seneca, South Carolina Identification of Occurrence: Penetration Room Ventilation System Inoperable Conditions Prior to Occurrence: Hot Standby - performing Zero Power Physics Tests.

Description of Occurrence: Both trains of the Unit 1 Penetration Room Ventila-tion System (PRVS) were declared inoperable due to high humidity in the west penetration room.

Apparent Cause of Occurrence: The cause of this incident was a hinge pin gasket leak on valve 1FDW-215, which created the high humidity environment in the penetration room.

Analysis of Occurrence: The leak on valve 1FDW-215 was not radioactive and was not large enough to constitute a significant feedwater or steam line break.

The high humidity environment would cause a reduction in the PRVS filter efficiency for iodine, lower than the filter efficiency assumed in the FSAR analysis for a LOCA. Due to the conservative assumptions in the FSAR analysis

, and the remote possibility of a simultaneous LOCA this event is not considered l significant with respect to the health and safety of the public.

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! Corrective Action: The leak on valve 1FDW-215 was repaired. The penetration room humidity decreased and the PRVS was declared operable.

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