PNO-III-07-003, Palisades - Palisades Shutdown to Replace Heat-Damaged Cables
| ML070580522 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 02/27/2007 |
| From: | Eric Duncan, Christine Lipa NRC/RGN-III/DRP/RPB4, NRC/RGN-III/DRP/RPB6 |
| To: | |
| References | |
| PNO-III-07-003 | |
| Download: ML070580522 (1) | |
February 27, 2007 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-III-07-003 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 III staff on this date.
Facility Palisades Nuclear Plant Nuclear Management Co.
Covert MI Docket: 50-255 License: DPR-20 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency x Not Applicable
SUBJECT:
PALISADES SHUTDOWN TO REPLACE HEAT-DAMAGED CABLES DESCRIPTION:
On February 26, 2007, the licensee shut the plant down to replace cables which had been damaged by excessive heat from an uninsulated portion of a steam generator blowdown pipe.
On February 17, 2007, an auxiliary operator identified damaged cables in an overhead raceway. After further inspection and evaluation, the licensee determined the plant shutdown was necessary to replace the cables and install insulation on the blowdown pipe.
The licensee indicated that 36 electrical cables were in the affected cable tray. The cables were associated with the component cooling water system, service water system and with non-safety-related equipment. The steam generator blowdown pipe is in constant use during plant operations to maintain steam generator chemistry. Some of the blowdown pipe is insulated, but this section had apparently never had insulation installed.
In addition to the cable replacement, the licensee is also replacing four control rod drive mechanism seals which had developed minor leakage.
The NRC resident inspectors are monitoring the licensees investigation of the cable problem and the replacement activities. An electrical specialist from the Region III (Chicago) office has arrived on site to assist with the inspection.
The State of Michigan will be notified. The information in this preliminary notification has been reviewed with licensee management.
The licensee first notified the resident inspectors of the problem on February 20. The licensee submitted an Event Report to the NRC Operations Center of the problem on February 25, and subsequently determined that a shutdown was necessary. This information is current as of 2 p.m. on February 27, 2007.
CONTACTS:
Eric Duncan Christine Lipa 630/829-9628 630/829-9619