05000341/FIN-2010006-01
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Finding | |
|---|---|
| Title | Inadequate Calculations for Availability of 120kV System Offsite Power |
| Description | The inspectors identified a finding having very low safety significance with an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to perform adequate calculations to ensure the availability of offsite power. Specifically, on two occasions the licensee failed to perform adequate calculations to demonstrate the availability of 120kV system offsite power. The first occasion was related to the analysis in calculation DC-0919 for conditions when the System Service (SS) transformer No. 64 load tap changer (LTC) was in service. The second occasion was related to Technical Service Request (TSR)-35286, which analyzed conditions for placing the SS transformer No. 64 LTC in manual. This finding was entered into the licensees corrective action program to revise the calculations and perform an Engineering Functional Analysis (EFA) to demonstrate operability. 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. Specifically, there was reasonable doubt as to whether the offsite power supply would remain operable during a design basis event pending re-analysis. This finding is of very low safety significance (Green) because the design deficiency was confirmed not to result in loss of operability or functionality. This finding has a cross-cutting aspect in the area of Human Performance, Resources, because the licensee did not provide complete, accurate, and up-to-date design documentation, to assure nuclear safety. (IMC 0310, Section 06.01.b.(3) H.2(c) |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2010006 Section 1R21 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | B Jose C Baron C Brown C Moore G Skinner L Kozak M Jones P Lougheed Z Falevitsb Josec Baron C Brown C Moore G Skinner L Kozak M Jones P Laugheed Z Falevits |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
| ' | |
Finding - Fermi - IR 05000341/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2010Q2
Self-Identified List (Fermi)
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