PNO-II-99-015, on 990503,shutdown in Excess of 72 H Occurred. Licensee Is Still Conducting Investigation Into Cause of Main Generator Protection Lockout & Making Preparations to Inspect & Remove Any Excessive Fouling from Inside Afws

PNO-II-99-015:on 990503,shutdown in Excess of 72 H Occurred. Licensee Is Still Conducting Investigation Into Cause of Main Generator Protection Lockout & Making Preparations to Inspect & Remove Any Excessive Fouling from Inside Afws

ML20206G384
Person / Time
Site:	Catawba
Issue date:	05/05/1999
From:	Ogle C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-99-015, PNO-II-99-15, NUDOCS 9905070188
Download: ML20206G384 (1)

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i May 5, 1999 EEZLIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRE][QE PNO-II-99-015 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety cr public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by Region II staff in Atlanta, Georgia on this date.

Facility Licensee Emeraency . Classification Duke Power Co. Notification of Unusual Event Catawba 2 Alert York, South Carolina Site Area Emergency Dockets: 50-414 General Emergency X Not Applicable

Subject:

SHUTDOWN IN EXCESS OF 72 HOURS On May 3, 1999, at 6:15 p.m., Catawba Unit 2 had a runback / power reduction from 100% power to approximately 10% power due to a main generator protection lockout (neutral ground fault). The unit was subsequently shut down at 5:09 a.m., on May 5, 1999, as a result of unrelated concerns over auxiliary feedwater system operability that were raised due to a potential of excessive fouling and resultant flow degradation in its assured nuclear service water supply piping. (See j 10CFR50.72 Event Report number 35670). l The licensee is still conducting an investigation into the cause of the ma n generator protection lockout, and is making preparations to inspect and remove any excessive fouling from inside the auxiliary feedwater system's nuclear service water supply piping. Excessive fouling of the nuclear service water supply piping to the Unit 1 auxiliary feedwater system will also be removed prior to the end of the current Unit i refueling outage.

The resident inspectors will continue their independent inspection of these events and monitor the licensee's, recovery actions. This information is current as of 11:00 a.m., on May 5, 1999.

The States of South Carolina and North Carolina have been notified. .

Contact:

C. Ogle (404)S62-4510 1

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9905070188 990505 A PDR I&E 'l PNO-II-99-015 PDR lg j

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