05000397/FIN-2013007-02
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Finding | |
|---|---|
| Title | Failure to Demonstrate Independence Requirements of IEEE 308-1974 for Divisions 1 and 2 Vital Instrumentation and Control Power Systems |
| Description | The team identified a Green non-cited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, which states in part, that design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. Specifically, prior to August 22, 2013, the licensee failed to verify by either an analysis or test that the Class 1E inverters would continue to operate reliably when subjected to the effects of electrical faults that could be postulated to occur at non-Class 1E loads, due to a lack of seismic qualification of the loads, during and after a design basis loss-of-offsite power (LOOP) and seismic event. This violation was entered into the corrective actions program as Action Requests 291144 and 291248. Once identified, the licensee performed preliminary short circuit and coordination calculations during the inspection to provide reasonable assurance that the Class 1E fuses in the distribution to the non-Class 1E loads would operate within the first cycle of fault current. The team determined that the failure to demonstrate conformance to the independence requirements of IEEE 308-1974 was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the finding resulted in a condition where there was a reasonable doubt on the operability of the system. Using the NRC Manual Chapter 0609, Appendix A, Exhibit 4, the team determined a detailed risk evaluation was necessary because the finding involved the total loss of safety function that contributed to an external event initiated core damage accident sequence. Therefore, the senior reactor analyst performed a bounding detailed risk evaluation. The analyst determined, qualitatively, that the change to the core damage frequency would be less than 1E-7 per year (Green). Since the change to the core damage frequency was less than 1E-7 per year, the finding was not significant to the larger early release frequency. This finding did not have a crosscutting aspect because the most significant contributor did not reflect current licensee performance. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2013007 Section 1R21 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Buchanan T Martinez Navedo W Smith G Replogle J Braisted M Yeminy S Kobylarz |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Columbia - IR 05000397/2013007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2013Q3
Self-Identified List (Columbia)
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