05000341/FIN-2015008-04
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Finding | |
|---|---|
| Title | Failure to Test the Electrical Characteristics for Control Power Transformers to Verify the Degraded Voltage Calculations Results |
| Description | The inspectors identified a finding of very-low safety significance (Green), and an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to ensure that design parameters for Structures, Systems, and Components (SSCs) installed in the plant were bounded by the design calculations. Specifically, the licensee failed to verify by testing that the turn ratio, and the impedance for the control power transformers (CPTs) used to supply control power to several SSCs installed in the plant were less than or equal to the values used in the degraded voltag
calculations. The licensee entered this finding into their CAP as CARD 15-21129, and determined that there was reasonable assurance that the CPTs installed in the field are capable of performing their design function. The performance deficiency was determined to be more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of design control and affected the cornerstone objective of ensuring the capability and reliability of systems that respond to initiating events. The finding screened as of very-low safety significance (Green) because the finding did not result in the loss of operability or functionality of any affected SSCs. The inspectors determined this finding had an associated cross-cutting aspect, Conservative Bias, in the Human Performance cross-cutting area because of the licensee failure to use decision making practices that emphasize prudent choices over those that were simply allowable. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2015008 Section 1R17 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Barrier Integrity, Initiating Events, Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.17 |
| Inspectors (proximate) | A Dahbur A Shaikh J Corujo-Sandin R Daley |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Fermi - IR 05000341/2015008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2015Q1
Self-Identified List (Fermi)
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