United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for December 13, 2005

Headquarters Daily Report

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REGION III

Manual Trip of Reactor

Licensee/Facility:

NUCLEAR MANAGEMENT CO., LLC
Point Beach 1
TWO RIVERS, Wisconsin
Dockets: 05000266
[1] W-2-LP
License No:
Notification:

MR Number: 3-2005-0023
Date: 12/13/2005

Call from Licensee

Discussion:

At 3:39 a.m., control room operators manually tripped Unit 1 when main condenser vacuum began to decrease rapidly. Loss of vacuum would have resulted in an automatic reactor trip had the operators not manually tripped the reactor. The decrease in vacuum was caused by the failure of a running circulating water pump. The initial evaluation indicated a failure of the coupling between the pump and motor. The licensee is developing plans to evaluate the cause of the failure and repair the coupling. Plant equipment responded as designed to the trip.

Regional Action: The resident inspectors are following the licensee's evaluation of the cause of the coupling failure.

Accession Numbers:

Accession No Accession Date
ML053470321 12/13/2005

Contacts:

Name Office Abbrev Phone No E-Mail
LOUDEN, PATRICK L R3 (630) 829-9627 PLL@nrc.gov
Page Last Reviewed/Updated Thursday, March 29, 2012