PNO-I-09-007, A: Update - Millstone Unit 3 Reactor Trip and Shutdown Greater than 72 Hours
| ML100060370 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/06/2010 |
| From: | Diane Jackson NRC/RGN-I/DRP/PB5 |
| To: | |
| Jackson, D E RI/DRP/PB5/610-337-5306 | |
| References | |
| FOIA/PA-2011-0115 PNO-I-09-007A | |
| Download: ML100060370 (2) | |
DCS No.: 0500042301062010 Date: January 6, 2010 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-I-09-007A 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 I staff on this date.
Facility Licensee Emergency Classification Dominion Nuclear Connecticut Notification of Unusual Event Millstone Unit 3 Alert Waterford, CT Site Area Emergency Docket: 50-423 General Emergency X Not Applicable
SUBJECT:
UPDATE - MILLSTONE UNIT 3 REACTOR TRIP AND SHUTDOWN GREATER THAN 72 HOURS This preliminary notification supplements information in PNO-I-09-007, which documented an automatic reactor trip at Millstone Unit 3 that resulted in a shutdown greater than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. The plant trip was caused by an electrical fault on the main generator output circuit breaker.
Dominion replaced the faulty main generator output circuit breaker and supporting components. Testing of the replacement main generator output circuit breaker and supporting components was completed satisfactorily on January 4, 2010. Dominion commenced a plant startup on January 5, 2010. Currently, Millstone Unit 3 is synchronized to the electrical grid and raising power.
The NRC staff continues to closely follow Dominions causal evaluations and corrective actions. NRC oversight will be conducted through the agencys normal independent baseline inspections, by the on-site resident inspectors.
The information presented herein has been discussed with Dominion and is current as of January 6, 2010, at 10:00 a.m.
This preliminary notification is issued for information only.
ADAMS Accession Number: ML100060370 CONTACT: Donald Jackson (610) 337-5306
DISTRIBUTION: (by email: Rl-DL-PN; PN_Distribution)
Chairman Jazcko Comm. Klein Comm. Svinicki OIP OCA OGC OPA EDO OE NRR SECY IRO NMSS ACRS OIG RES NSIR NRO PDR RSLO Regional Offices By Fax:
DOT:Trans INPO NSAC RI Resident Office Licensee: Dominion Nuclear Connecticut (Millstone 3)
ADAMS Accession Number: ML100060370 SUNSI Review Complete: DEJ ___ (Reviewers Initials)
DOCUMENT NAME: G:\DRP\PNs\PNO-I-09-007A - MS3 Rx Trip Update.doc After declaring this document An Official Agency Record it will be released to the Public.
To receive a copy of this document, indicate in the box:"C" = Copy without attachment/enclosure E" = Copy with attachment/enclosure "N" = No copy OFFICE RI/DRP RI/ORA RI/PAO RI/DRP NAME DJackson/DEJ RBarkley/ RB DScrenci/ DS DLew/ DCL DATE 01/06/10 01/06/10 01/06/10 01/ 06/10 OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)