05000263/FIN-2009007-04
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Finding | |
|---|---|
| Title | Inadequate Testing for MCC Contactors |
| Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, having very low safety-significance for the failure to have adequate testing for safety-related equipment to monitor component degradation. Specifically, the licensee failed to verify that the motor control center contactors would continue to pick-up under degraded voltage conditions with less than the vendors required minimum voltage. These issues were entered into the licensees corrective action program to test the 13 contactors as soon as practicable and to revise the maintenance procedures to incorporate the requirements for periodic testing of contactors. The finding was more than minor because it was associated with the Mitigating Systems cornerstone attribute of design control and affected the cornerstone objective of ensuring the availability, reliability, and capability of safety-related equipment to respond to initiating events to prevent undesirable consequences. This finding is of very low safety-significance (Green) because the testing deficiency was confirmed, with the exception of ESW pump P-111B, not to result in loss of operability or functionality. Specifically, subsequent testing confirmed for nine contactors that the safety-related starter coils would still function at the calculated degraded voltage values. Although three of the contactors have not been tested, they were of a different size than the failed contactor and there appeared to be reasonable assurance based on the successful tests that these contactors also remained operable. With respect to the ESW pump, the failed test confirmed that the motor starter contactor would not pickup under degraded voltage conditions due to mechanical binding of the contactor arm such that the ESW pump was considered inoperable. Based on a Phase III analysis, the failure of the pump to start under degraded voltage conditions was determined to be very low safety-significance (Green). The inspectors did not identify a cross-cutting aspect associated with this finding because this was a legacy design issue and therefore was not reflective of current performance |
| Site: | Monticello  |
|---|---|
| Report | IR 05000263/2009007 Section 1R21 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dunlop A Stone C Brown H Campbell J Bozga L Jones M Munir N Feliz Adomo S Kobylarz |
| INPO aspect | |
| Finding closed by | |
| IR 05000263/2009007 (6 January 2010) | |
| ' | |
Finding - Monticello - IR 05000263/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2009Q4
Self-Identified List (Monticello)
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