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Category:NRC Preliminary Notification of Event/Occurrence
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2018-04-04
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PRELIMINARY NOTIFICATION- REGION III October 5, 2011 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-III-11-012
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 III staff on this date.
Facility Perry Nuclear Power Plant FirstEnergy Nuclear Operating Company Perry, Ohio Docket: 50-440 License: NPF-58 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency X Not Applicable
SUBJECT:
PERRY UNPLANNED SHUTDOWN GREATER THAN 72 HOURS DESCRIPTION:
On October 2, 2011, at 1:00 a.m. (EDT), Perry Nuclear Power Plant began to shut down the reactor (Event Notification 47312) as required by Technical Specification 3.8.1.A.2 due to one of two required off-site power sources being inoperable.
The Unit 1 startup transformer, one of the two required off-site power sources, was declared inoperable at 5:29 a.m. (EDT) on September 29, 2011, due to a suspected internal electrical fault, which also caused a crack in the reservoir that holds oil used to cool the transformer. This put the plant in a Technical Specification Limited Condition of Operation (LCO) to restore the startup transformer within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or shutdown. The other source of off-site power remained available.
The NRC resident inspectors monitored plant shutdown and will continue to monitor licensee activities as they complete repairs.
This Preliminary Notification is issued for information only. State and local officials have been informed.
The information presented herein has been discussed with the licensee and is current as of October 5, 2011, at 08:00 a.m. (EDT).
ADAMS Accession Number: ML112780137.
CONTACT: Jamnes Cameron 630/829-9833
