05000400/FIN-2011008-02
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Finding | |
|---|---|
| Title | Inadequate Control of Degraded Voltage Time Delay Settings Two Examples |
| Description | The team identified a Green, NCV with two examples of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to properly control degraded voltage time delay setpoints. The licensee is evaluating changing the TS and field limits for the relays. Permanent corrective actions are still being evaluated by the licensee. The licensee entered these issues into the CAP as NCR 458376 and NCR 460601. The failure to properly analyze the degraded voltage time delay setpoints was a performance deficiency. The finding was considered more than minor because it affected with 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, the licensee had not analyzed whether electrical equipment needed to respond to an accident would be energized by the emergency diesel generators within the time considered in the accident analysis if a degraded voltage condition existed concurrent with an accident. In addition, there was reasonable doubt as to whether the permanently connected safetyrelated loads would remain available to respond to a LOOP following a nonaccident degraded voltage condition, for the duration of the time delay chosen for the degraded voltage relay. The finding was of very low safety significance since it was a design or qualification deficiency confirmed not to result in loss of operability or functionality. The inspectors did not identify a cross cutting aspect for this finding because this finding was not indicative of current licensee performance. |
| Site: | Harris  |
|---|---|
| Report | IR 05000400/2011008 Section 1R21 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | S Walker C Baron G Skinner P Higgins D Mas-Penaranda R Patterson B Desai D Terri-Ward |
| INPO aspect | |
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Finding - Harris - IR 05000400/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2011Q2
Self-Identified List (Harris)
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