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Category:NRC Preliminary Notification of Event/Occurrence
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PRELIMINARY NOTIFICATION September 15, 2015 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE - PNO-III-15-009 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. Some of the information may not yet be fully verified or evaluated and is basically all that is known by the Region III staff on this date.
Facility Licensee Emergency Classification Fermi Power Plant (Fermi 2) Notification of Unusual Event DTE Energy Company Alert Newport, MI Site Area Emergency Docket: 50-341 General Emergency License: NPF-43 X Not Applicable
SUBJECT:
UNPLANNED SHUTDOWN GREATER THAN 72 HOURS FOLLOWING THE LOSS OF COOLING WATER IN THE TURBINE BUILDING At 11:05 p.m. (EDT) on September 13, 2015, operators manually shut down (scrammed)
Fermi 2 from 100 percent power after attempts to correct a malfunction of a nonsafety-related cooling water system in the turbine building were unsuccessful and the three pumps in the system shut down. The malfunction arose earlier that evening while operators were working on the cooling water system heat exchangers.
All control rods inserted and all plant systems responded normally to the scram. The loss of the nonsafety-related cooling water system resulted in the loss of the station compressed air system, which affected valves that are operated by air. Operators took the appropriate actions for those affected valves.
The licensee is investigating the cause of the malfunction and will be repairing two valves that were identified as in need of repair. On September 14, the licensee successfully restarted the nonsafety-related cooling water system. The licensee stated that the reactor would be shutdown for at least 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />.
The NRC resident inspector was notified of the scram, promptly responded to the plant, and monitored activities throughout the early morning. The NRC is currently monitoring the troubleshooting, repair, and restart activities.
This preliminary notification is issued for information only.
State and local officials have been informed.
Region III received initial notification of the occurrence by a telephone call shortly after the event via Event notification 51391.
2 The information presented herein has been discussed with the licensee, and is current as of 9:45 am (CDT), September 15, 2015.
ADAMS Accession Number ML15258A691
Contact:
Michael Kunowski 630-829-9618 michael.kunowski@nrc.gov
