05000289/FIN-2009006-03
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Finding | |
|---|---|
| Title | Failure to Install Amptector Bypass Jumper for Load Center Breaker |
| Description | The team identified a NCV of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, Drawings, in that Exelon did not include appropriate quantitative or qualitative acceptance criteria for determining that important activities have been satisfactorily accomplished. Specifically, the team identified that the maintenance and testing procedure E-5.2 for the Westinghouse type DB-50 480V safetyrelated load center circuit breaker did not include instructions to ensure that a jumper be installed to defeat the Amptector discriminator circuit. The failure to install the jumper resulted in the feeder breaker to a safety-related motor control center not meeting Exelons design requirements that were implemented to ensure breaker coordination existed between safety and non-safety related equipment. Following identification of the issue Exelon performed an operability assessment and implemented compensatory actions to ensure breaker coordination was maintained. This finding is more than minor because it affected the design control attribute of the mitigating systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was of very low safety significance since it was a design deficiency determined not to have resulted in the loss of safety function. The finding had a cross cutting aspect in Human Performance Resources which requires procedures to be complete, accurate and up-to-date. (H.2(c)) |
| Site: | Three Mile Island  |
|---|---|
| Report | IR 05000289/2009006 Section 1R21 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | K Mangan W Sherbin D Orr S Kobylarz J Tifft L Doerflein P Mckenna |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Three Mile Island - IR 05000289/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Three Mile Island) @ 2009Q2
Self-Identified List (Three Mile Island)
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