05000247/FIN-2009007-01
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Finding | |
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| Title | Failure to evaluate the impact on breaker coordination for the Westinghouse Amptector type LSG trip unit discriminator feature. |
| Description | The team identified a finding of very low safety significance involving a non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, in that Entergy did not verify the adequacy of design because they did not evaluate the impact of the installed Amptector discriminator instantaneous trip feature on breaker coordination. Following identification Entergy entered the issue into the corrective action program and performed an operability assessment and extent-of-condition review. The finding was more than minor because it was associated with the design control attribute of the Mitigating Systems cornerstone objective of ensuring the availability, reliability, and capability of the 480Vac bus to respond to initiating events to prevent undesirable consequences. Specifically, load center Bus 6A (and 2A, 3A and 5A) would be incapable of meeting the design basis function when required if the incoming line breaker to the load center bus were to trip due to lack of coordination for a fault on a non-Class 1E circuit during a design basis accident. The finding was determined to be of very low safety significance because the design deficiency was confirmed not to result in loss of operability or functionality. This finding was not assigned a cross-cutting aspect because the underlying cause was not indicative of current performance |
| Site: | Indian Point  |
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| Report | IR 05000247/2009007 Section 1R21 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | E Bonney J Rady J Richmond J Schoppy L Doerflein L Scholl M Balazik S Ibarrola S Kobylarz W Sherbin |
| INPO aspect | |
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Finding - Indian Point - IR 05000247/2009007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2009Q3
Self-Identified List (Indian Point)
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