PNO-II-93-038, on 930821,unit Experienced SG Tube Leak Resulting in Shutdown.Region II Will Continue to Monitor Licensee Actions to Determine Nature of Leak

PNO-II-93-038:on 930821,unit Experienced SG Tube Leak Resulting in Shutdown.Region II Will Continue to Monitor Licensee Actions to Determine Nature of Leak

ML20056F913
Person / Time
Site:	McGuire
Issue date:	08/23/1993
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-93-038, PNO-II-93-38, NUDOCS 9309010016
Download: ML20056F913 (1)

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August 23, 1993 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-93-038 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region II staff on this date.

Facility Licensee Emercency Classification Duko Power Co. Notification of Unusual Event Mcguire 1 Alert Cornelius, North Carolina Site Area Emergency Dockets: 50-369 General Emergency X Not Applicable

Subject:

SHUTDOWN DUE TO STEAM GENERATOR TUBE LEAK On August 21, 1993, McGuire Unit 1 was operating at 100% power and exparienced a Steam Generator (SG) tube leak. At 10:50 p.m. radiation alarms were received from the steam line (Nitrogen 16) process radiation monitor and the condenser air ejector radiation monitor. The licensee initiated its abnormal procedure which directed chemistry technicians to taka SG samples. At 00:36 on August 22, the chemistry samples indicated that the "A" SG had a tube leak of approximately 176 gallons per day (gpd) ,- and the licensee commenced a shutdown. At 5:10 a.m. the unit was taken off-line and the reactor was shut down at 5:21 a.m. At 6:35 a.m.

the licensee commenced cooldown and depressurization in accordance with the abnormal procedure. The resident inspector responded to the site and monitored the shutdown and cooldown. The licensee expects the unit to remain shutdown between 16 and 35 days for inspection and repairs.

Region II will continue to monitor licensee actions to determine the nature of the leak.

The NRC received initial notification of the event by a telephone call from the licensee at shortly after 00:36 to the resident inspector.

Tha licensee does not intend to issue a press release. The NRC will respond to any inquiries received.

Tho' State of North Carolina was notified.

This information is current as of 4:00 p.m. August 23, 1993.

Contact:

M. Lesser (404)331-0342 9309010016 930823 PDR I&E PND-II-93-039 PDR (fD IE3Y mkgnw