05000250/FIN-2011008-04
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Finding | |
|---|---|
| Title | Inadequate Voltage Calculations |
| Description | The team identified a NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to perform adequate voltage calculations for safety-related equipment with two examples. The licensee entered these issues into their corrective action program as ARs 1677149, 1677149-02, 1673843, 1677149-02, 1676754 and 01676641 and performed evaluations to provide reasonable assurance that components would have adequate voltage pending forma re-analysis. The inspectors determined that the failure to perform adequate design calculations to support the setpoint of the degraded voltage relays and the failure to perform adequate design calculations for the 120Vac instrument system was a performance deficiency. The finding was more than minor because it affected the Mitigating Systems Cornerstone attribute of Design Control, and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, there was reasonable doubt as to whether the components would have adequate voltage to perform their safety function during a degraded voltage condition. The finding was considered to be of very low safety significance (Green) since this was a design deficiency confirmed not to have resulted in a loss of operability or functionality. The team determined that no cross cutting aspect was applicable to this performance deficiency because this finding was not indicative of current licensee performance. |
| Site: | Turkey Point  |
|---|---|
| Report | IR 05000250/2011008 Section 1R21 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | D Jones G Skinner D Mas-Penaranda M Yeminy R Patterson B Desai E Stamm D Terri-Ward |
| INPO aspect | |
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Finding - Turkey Point - IR 05000250/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Turkey Point) @ 2011Q3
Self-Identified List (Turkey Point)
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