PNO-III-97-077, on 970909,licensee Began Reactor Shutdown After Steam Leak Identified in Steam Tunnel.Leak Was on Capped Drain Line Off a Main Steam Line,Between Two Main Steam Isolation Valves.State of IA Will Be Notified

PNO-III-97-077:on 970909,licensee Began Reactor Shutdown After Steam Leak Identified in Steam Tunnel.Leak Was on Capped Drain Line Off a Main Steam Line,Between Two Main Steam Isolation Valves.State of IA Will Be Notified

ML20216E860
Person / Time
Site:	Duane Arnold
Issue date:	09/10/1997
From:	Dupont S, Jordan M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-97-077, PNO-III-97-77, NUDOCS 9709110094
Download: ML20216E860 (1)

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i 1- September 10, 1997 PREllMli4ARY NOTlflCAT10!10F EVENT OR UfJUSUAL OCCURRENCE PN0 Ill 97 077 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 111 staff (Lisle, Illinois) on this date.

Facility Licensee Emergency Classification lowa Electric Light & Power Co. Notification of Unusual Event Duane Arnold 1 Alert Palo.lowa Site Area Emergency Dockets: 50 331 General Emergency X Not Applicable

Subject:

PLANT SHUTDOWN TO REPAIR LEAK IN ORAIN LINE OFF "A" MAIN STEAM LINE On September 9. 1997, at approximately 12:00 p.m. (CDT), the licensee began a reactor shutdown af ter a steam leak was identified in the steam tunnel. The leak was on a capped drain line off the "A" main steam line, between the two main steam isolation valves. The cause of the leak was a 180 degree crack in a welded joint at a 2-inch to 1 inch reducer. The main turbine generator was removed from the grid at approximately 6 p.m.

In addition to repairing the drain line. the licensee intends to inspect similar drain lines for possible crocking.

The outage is expected to last approximately three days. During the '

outage, the licensee also plans to replace the "A" electrohydraulic control pump and perform other balance of-plant maintenance.

The resident inspectors observed the plant shutdown and will monitor outage activities and plant startup.

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

This information is current as of 10:00 a.m. on September 10, 1997.

Contact:

STEVIE DUPONT MICHAEL JORDAN (630)829 9608 (630)829-9637 S,k

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9709110094 970910 \ eg\ s E-I!h97-077PDR

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