PNO-III-98-011, on 980123,unidentified Leakage Increased by Approx 10 to 0.2 Gallons Per Minute.Licensee Began Preparations to Shut Down & Repair Leak in Canopy Seal

PNO-III-98-011:on 980123,unidentified Leakage Increased by Approx 10 to 0.2 Gallons Per Minute.Licensee Began Preparations to Shut Down & Repair Leak in Canopy Seal

ML20206R859
Person / Time
Site:	Prairie Island
Issue date:	01/26/1998
From:	Michael Kunowski, Mccormickbarge NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-98-011, PNO-III-98-11, NUDOCS 9901200321
Download: ML20206R859 (1)

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l January 26, 1998 l

! PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-III-98-011 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 Region III staff (Lisle, Illinois) on this date.

Facility Licensee Emergency Classification Northern States Power Co. Notification of Unusual Event Prairie Island 2 Alert Welch, Minnesota Site Area Emergency Dockets: 50-306 General Emergency X Not Applicable

Subject:

UNIT 2 SHUTDOWN TO REPAIR PRIMARY SYSTEM LEAK Early on January 23, 1998, the unidentified leakage in Prairie Island l Unit 2 increased by about a factor of 10 to 0.2 gallons per minute. Later i that day, the licensee entered containment and identified the likely i source of the leak as the canopy seal of the G-9 partial length control I rod drive. The licensee subsequently began preparations to shut down Unit i 2 and repair the leak. '

On January 24, 1998, Unit 2 was taken offline and is expected to be shut down for about a week. In addition to inspecting and repairing the leak associated with control rod drive G-9, the licensee plans to modify the reactor coolant pump lube oil collection system to address a recently identified concern with the adequacy of the system, repair leaky nitrogen supply valves for the safety injection accumulators, and perform other maintenance activities.

The resident inspectors monitored the shutdown and will review the repair work and other activities.

The State of Minnesota will be notified. The information in this preliminary notification has been reviewed with licensee management.

This information is current as of 9 a.m. (CST) on January 26, 1998.

Contact:

MICHAEL KUNOWSKI J. MCCORMICK-BARGER (630)829-9618 (630)829-9872 l

l 9901200321 980126 [. ,

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