United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for August 28, 2006

Headquarters Daily Report

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REGION II

UNIT 2 REACTOR TRIP DUE TO LOSS OF REACTOR COOLANT PUMP

Licensee/Facility:

SOUTHERN NUCLEAR OPERATING CO., INC.
Vogtle 1, Vogtle 2
WAYNESBORO, Georgia
Dockets: 05000424, 05000425
[1] W-4-LP, [2] W-4-LP
License No:
Notification:

MR Number: 2-2006-0003
Date: 08/28/2006

Call from SRI

Discussion:

This Morning Report provides information concerning a Unit 2 reactor trip that occurred on August 27, 2006. While operating at 99.7% of full rated thermal power, the number 4 reactor coolant pump (RCP) tripped. Since the reactor was operating above the P-8 setpoint, an automatic reactor trip was generated on single reactor coolant system (RCS) loop low flow. Auxiliary feedwater (AFW) automatically started on steam generator low-low level as expected. The reactor was stabilized and is currently being maintained in Mode 3 (Hot Standby) using AFW and condenser steam dumps.

The licensee is conducting troubleshooting to determine the cause of the RCP number 4 trip. If the licensee determines that the RCP motor must be replaced, the unit will likely be taken to Mode 5 (Cold Shutdown) to facilitate the repair which would be in excess of 72 hours.

Accession Numbers:

Accession No Accession Date
ML062400423 08/28/2006

Contacts:

Name Office Abbrev Phone No E-Mail
SHAEFFER, SCOTT M R2 (404) 562-4520 SMS@nrc.gov
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