ENS Event | |
|---|---|
05:00 Mar 14, 2003 | |
| Title | 10 Cfr Part 21 Report Regarding Failures of Abb Circuit Breakers |
| Event Description | Circuit breakers manufactured by ABB Inc. and used for Class 1E applications by Westinghouse were shipped to the Calvert Cliffs Plant with model 5 operating mechanisms installed. Recently, Westinghouse had retrofitted the breakers with model 7 operating mechanisms manufactured by ABB Inc. Westinghouse validated that the original breaker qualifications (for Class 1E applications) are still applicable with the model 7 operating mechanism installed. Two of these breakers failed to close and latch during testing at Calvert Cliffs. The first breaker failed to close and latch during acceptance testing on January 18, 2003. The second breaker failed to close and latch during its installation acceptance test in the breaker cubicle on January 27, 2001.
Summary: The issue reported in the notification above is limited in scope and there is no indication that the failure mode will exist in a K-Line breaker. ABB does concur that dimensional non-conformities were present in the breakers that exhibited the fail to close of the primary and secondary trip latches. ABB also concurs that this out-of-tolerance situation is contributory to the failure exhibited in the 5VHKR250 1200A breaker but is not in and of itself the root cause of failure. Notified R1DO (R. Lorson), R2DO (M. Ernstes), R3DO P. Louden), R4DO (L. Smith), NRR (Jack Foster) via email |
| Where | |
|---|---|
| Abb Inc Pittsburgh, Pennsylvania (NRC Region 1) | |
| Organization: | Westinghouse |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+10.78 h0.449 days <br />0.0642 weeks <br />0.0148 months <br />) | |
| Opened: | Hank Sepp 15:47 Mar 14, 2003 |
| NRC Officer: | Yamir Diaz |
| Last Updated: | Dec 25, 2003 |
| 39670 - NRC Website | |
Abb Inc with 10 CFR 21.21 | |
WEEKMONTHYEARENS 396702003-03-14T05:00:00014 March 2003 05:00:00
[Table view]10 CFR 21.21 10 Cfr Part 21 Report Regarding Failures of Abb Circuit Breakers 2003-03-14T05:00:00 | |