05000395/FIN-2014007-03
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Finding | |
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| Title | |
| Description | The team identified a Green non-cited violation NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to consider instrument uncertainties when determining refueling water storage tank (RWST) setpoints and associated time critical operator actions in procedures to perform RWST swapover. Specifically, the licensee failed to consider instrument uncertainties associated with the control room annunciator RWST Empty alarm at 6% with respect to the critical vortex level and second, the RWST indicated level of 10% at which pumps would be secured in emergency operating procedures (EOPs). Following identification by the team, the licensee generated CR-14-05792, CR-14-05869, and CR-14-05868 to address the finding. The licensee also revised procedure EOP-2.2,ES-1.3, Transfer to Cold Leg Recirculation, to Rev. 17. The licensee performed an operability determination and concluded that the safety injection system was operable but degraded. The team determined that the performance deficiency was more than minor because it affected the Design Control attribute of the Mitigating Systems cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the licensee failed to consider uncertainties associated with the level alarms and level indicators for the RWST, and as a result, impacted the availability, reliability, and capability of the ECCS to respond to initiating events. The team determined the finding to be of very low safety significance (Green) because it was a deficiency affecting the design or qualification of a mitigating structures, systems, and components (SSC), and the SSC maintained its operability or functionality. The team determined that no cross-cutting aspect was applicable because the finding was not indicative of present licensee performance. |
| Site: | Summer  |
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| Report | IR 05000395/2014007 Section 1R21 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | H Campbell J Eargle N Coovert N Patel R Kopriva R Nease T Su A Popova |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Summer - IR 05000395/2014007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Summer) @ 2014Q4
Self-Identified List (Summer)
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