05000341/FIN-2012007-03
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Finding | |
|---|---|
| Title | Failure to Identify EDG\\\'s Neutral Grounding Resistor Exceeded its Design Values |
| Description | The inspectors identified a finding of very low safety significance and an associated NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to identify and correct a condition adverse to quality. Specifically, the licensee failed to identify and evaluate that the installed Neutral Grounding Resistors (NGRs) for emergency diesel generators (EDGs) exceeded the maximum design value specified in the design basis calculation. The field measurement data obtained by the licensee in support of the 4.16kV cable replacement modification, in November 2011, exceeded the design value of 4.225 ohms specified in calculation DC-5373. The licensee entered this issue into their corrective action program to revise the design calculation to incorporate using the measured or the resistors maximum tolerance value. The inspectors determined that the finding was more than minor because the finding was associated with the Mitigating Systems cornerstones attribute of Equipment Performance and affected the cornerstones objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the licensee failed to assure that the measured NRG for EDG-11 and EDG-13, which exceeded the maximum design value specified in the design basis calculation would perform their design function during overvoltage and fault conditions. The finding was of very low safety significance because it did not result in a loss of operability. No cross-cutting aspects were associated with this finding. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2012007 Section 1R17 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | M Holmberg R Langstaff A Dahbur J Gilliam H Peterson I Hafeez |
| INPO aspect | |
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Finding - Fermi - IR 05000341/2012007 | |||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2012Q1
Self-Identified List (Fermi)
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