05000321/FIN-2015007-04
From kanterella
Jump to navigation
Jump to search
Finding | |
---|---|
Title | Failure to Verify Design Basis Timing Margins for Safety Related Motor Operated Valves |
Description | The NRC identified a Non-cited Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to evaluate if transients in control power voltage could affect the design basis margins for the timing of safety-related motor operated valves (MOVs). The licensee planned to perform corrective actions to ensure that the safety analysis remains bounded, and entered this violation into their Corrective Action Program as Condition Report 10138053. The performance deficiency was determined to be more than minor because it was associated with the Design Control attribute of the Mitigating Systems Cornerstone, and adversely affected the cornerstone objective, in that the failure to evaluate transients that effect the timing margins for NOVs affected the established reliability and capability of the valves. The finding was determined to be of very low safety significance (Green) because the deficiency did not result in actual loss of safety function. This finding was not assigned a cross-cutting aspect because the issue did not reflect current licensee performance (Section 1R21.2.b.4). |
Site: | Hatch ![]() |
---|---|
Report | IR 05000321/2015007 Section 1R21 |
Date counted | Dec 31, 2015 (2015Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | C Baron G Nicely J Bartley M Riley S Herrick T Fanelli |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
INPO aspect | |
' | |
Finding - Hatch - IR 05000321/2015007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Hatch) @ 2015Q4
Self-Identified List (Hatch)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||