ENS 43782
ENS Event | |
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19:00 Nov 14, 2007 | |
Title | Part 21 Notification - Areva 4Kv Cutler Hammer Breakers |
Event Description | The licensee provided the following information via facsimile:
In accordance with 10CFR21.21(d)(3), Southern Nuclear Operating Company (SNC) is making notification of a defect in a basic component supplied to Joseph M. Farley Nuclear Plant (Farley). A 10CFR21 report regarding a defect associated with Model MA-VR-350 4160 V circuit breakers supplied by AREVA was made by AREVA to SNC on October 3, 2007. The breaker design incorporates the use of a C-clip which may not have been properly installed or that can become dislodged from its groove on the Main Link Assembly pin which holds the Banana Link in place. If the Banana Link becomes disengaged from the Main link Assembly pin, the breaker will charge, but not close or it will leave the breaker in a 'trip-free' condition. The Model MA-VR-350 4160 V circuit breakers are used in the plant safety related 4160 V switchgear and serve as pump motor supply breakers for multiple safety related applications, e.g., component cooling water, low-head and high-head safety injection, containment spray, auxiliary feedwater, as well as the emergency diesel generator output breakers. Currently, there are breakers in stock and installed. Consequentially, their postulated failure in these critical applications could create a substantial safety hazard. Existing plant procedures already included pre-installation inspection steps for the Model MA-VCR-350 4160 V circuit breakers to identify loose nuts, bolts, retaining rings, or other hardware. In response to this concern, SNC revised plant procedures to add the C-clips to the inspection list to verify they are properly seated on the main link. Given the multiple examinations that were being conducted on the breakers in accordance with existing procedures, and the subsequent procedure enhancements that have been made to examine the C-clips, SNC determined that the installed breakers would continue to operate as designed on demand. As recommended by AREVA, a visual inspection, of the Model MA-VR-350 4160 V circuit breakers should be performed at regular maintenance intervals to insure proper installation of the C-clip on the main link assembly. SNC has been in contact with NRC Region II (Scott Shaffer, Chuck Casto) and has notified the NRC Resident Inspector. |
Where | |
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Farley ![]() Alabama (NRC Region 2) | |
Reporting | |
10 CFR 21.21 | |
Time - Person (Reporting Time:+-3.43 h-0.143 days <br />-0.0204 weeks <br />-0.0047 months <br />) | |
Opened: | Ben George 15:34 Nov 14, 2007 |
NRC Officer: | Fangie Jones |
Last Updated: | Nov 14, 2007 |
43782 - NRC Website
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Unit 1 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (30 %) |
After | Power Operation (30 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
WEEKMONTHYEARENS 437822007-11-14T19:00:00014 November 2007 19:00:00
[Table view]10 CFR 21.21 Part 21 Notification - Areva 4Kv Cutler Hammer Breakers 2007-11-14T19:00:00 | |