View source for PNO-I-09-007, A: Update - Millstone Unit 3 Reactor Trip and Shutdown Greater than 72 Hours

{{Adams
| number = ML100060370
| issue date = 01/06/2010
| title = PNO-I-09-007A: Update - Millstone Unit 3 Reactor Trip and Shutdown Greater than 72 Hours
| author name = Jackson D
| author affiliation = NRC/RGN-I/DRP/PB5
| addressee name = 
| addressee affiliation = 
| docket = 05000423
| license number = NPF-049
| contact person = Jackson, D E RI/DRP/PB5/610-337-5306
| case reference number = FOIA/PA-2011-0115
| document report number = PNO-I-09-007A
| document type = NRC Preliminary Notification of Event/Occurrence
| page count = 2
}}
{{#Wiki_filter: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 Dominion Nuclear Connecticut Millstone Unit 3 Waterford, CT Docket:  50-423 Licensee Emergency Classification Notification of Unusual Event        Alert        Site Area Emergency        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 hours. 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 Dominion's causal evaluations and corrective actions. NRC oversight will be conducted through the agency's 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  ___  (Reviewer's 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)}}

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