PNO-I-07-004, A: Update - Unusual Event Declared Due to Explosion in 31 Main Power Transformer at Indian Point Unit 3
| ML071150287 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 04/25/2007 |
| From: | Cobey E, Diane Jackson Reactor Projects Branch 2 |
| To: | |
| Cobey, Eugene W. RI/DRP/PB2/610-337-5171 | |
| References | |
| PNO-I-07-004A | |
| Download: ML071150287 (2) | |
DCS No.: 05000286040607 Date: April 25, 2007 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-I-07-004A 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 Entergy Nuclear Operations, Inc. Licensee Emergency Classification Indian Point Unit 3 Notification of Unusual Event Buchanan, NY Alert Docket: 50-286 Site Area Emergency General Emergency X Not Applicable
SUBJECT:
UPDATE - UNUSUAL EVENT DECLARED DUE TO EXPLOSION IN 31 MAIN POWER TRANSFORMER AT INDIAN POINT UNIT 3 This preliminary notification supplements information in PNO-I-07-004, which documented the declaration of an Unusual Event at Indian Point Unit 3 on April 6, 2007, following a transformer failure and fire. The Unusual Event was entered at 11:43 a.m., based on eyewitness reports of an explosion preceding a fire on the 31 main power transformer, and was subsequently exited at 12:47 p.m.
On April 7, 2007, while the Unit was shutdown, Entergy commenced activities to inspect both the 31 and 32 main power transformers. The 32 main power transformer sustained minor damage due to the explosion and fire on the 31 main power transformer. The apparent cause of the explosion and fire was a failure of the B-phase, high-voltage insulating bushing.
Entergy replaced the 31 main power transformer with a spare and performed repairs on the 32 main power transformer. Following maintenance and testing activities, Entergy plans to restore Indian Point 3 to full power operation.
The NRC staff continues to closely follow Entergys causal evaluations and corrective actions.
These activities will be conducted through the NRCs normal independent baseline inspections.
The information presented herein has been discussed with the licensee, and is current as of 7:00 a.m., April 25, 2007. This preliminary notification is issued for information only and no further notification by the staff is anticipated.
ADAMS Accession Number: ML071150287 CONTACTS: Eugene Cobey Donald Jackson (610) 337-5171 (914) 739-8565
2 DISTRIBUTION: (PN Recipient List)
Chairman Klein Comm. Lyons Comm. Jazcko Comm. McGaffigan Jr.
Comm. Merrifield OIG OIP OCA OGC OPA EDO OE NRR SECY NMSS OIG RES ACRS FSME NRO NSIR Regional Offices By Fax:
DOT:Trans INPO NSAC RI Resident Office Licensee: Entergy Nuclear Operations, Inc (Indian Point Unit 3)
ADAMS Accession Number: ML071150287 SUNSI Review Complete: JDO (Reviewers Initials)
DOCUMENT NAME: C:\FileNet\ML071150287.wpd 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/ORA RI/DRP RI/DRP NAME NSheehan /NAS ECobey/JDO for DLew/JWC for DATE 04/25/07 04/25/07 04/25/07 OFFICIAL RECORD COPY Region I Form 83 (Rev. July 2, 2003)