05000369/LER-1981-030, Forwards LER 81-030/03L-0.Detailed Event Analysis Encl

Forwards LER 81-030/03L-0.Detailed Event Analysis Encl

ML20052H969
Person / Time
Site:	McGuire
Issue date:	04/08/1981
From:	Parker W DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052H970	List: 05000369/LER-1981-030, Forwards LER 81-030/03L-0.Detailed Event Analysis Encl 05000369/LER-1981-030-03, /03L-0:on 810310,high Groundwater Alarm Received. Caused by Groundwater Level 0.6 Ft Above Slab Elevation. Level Monitored Until Alarm Cleared 6-h Later
References
NUDOCS 8205240262
Download: ML20052H969 (2)

LER-1981-030, Forwards LER 81-030/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3691981030R00 - NRC Website

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April 8, 1981

'/ic t PmESioENT IELEP=CNE: AmEA 7C4 STEau PacowCTiON 373-4083 Mr. James P. O'Reilly, Director U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 Re: McGuire Nuclear Station Unit 1 Docket No. 50-369

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/81-30. This report concerns high groundwater level. This incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, William O. Parker, Jr.

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

20555 Palo Alto, California 94303 1/

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.j DUKE POWER COMPANY MCGUIRE NUCLEAR STATION INCIDENT REPORT REPORT NUMBER:

R0-369/81-30 REPORT DATE: March 30, 1981 OCCURRENCE DATE: March 10, 1981 FACILITY: McGuire Nuclear Station IDENTIFICATION OF OCCURRENCE:

High groundwater alarm was received in the control room (WZ System)

CONDITION PRIOR TO OCCURRENCE: Mode 5, Cold Shutdown DESCRIPTION OF OCCURRENCE:

A groundwater level transmitter activated a high level alarm at 1342 hours0.0155 days <br />0.373 hours <br />0.00222 weeks <br />5.10631e-4 months <br /> on March 10, 1981. Level was 0.6 feet above slab elevation. This high level required increased surveillance per Technical Specification 4.7.13(b).

Level was monitored at least every 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at the accessible interior groundwater level monitoring stations. The alarm cleared at 1902 hours0.022 days <br />0.528 hours <br />0.00314 weeks <br />7.23711e-4 months <br /> on March 10, 1981.

APPARENT CAUSE OF OCCURRENCE:

The apparent cause of the alarm was localized temporary high groundwater level.

ANALYSIS OF OCCURRENCE:

When the high level alarm was received, the proper surveillance was conducted, and within six hours the alarm cleared.

CORRECTIVE ACTION

No corrective action is required.

SAFETY ANALYSIS

This event did not endanger the health or safety of the public.

If it had occurred while the plant was at power and remained in the alarmed condition for seven days, plant shutdown would have been required.

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