05000315/FIN-2015008-01
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Finding | |
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Title | Failure to Ensure the Required Seven Day EDG Fuel Oil Storage |
Description | The team identified a finding of very low safety significance (Green), and an associated NCV of Title 10, Code of Federal Regulations (CFR), Part 50, Appendix B, Criterion III, Design Control, for the failure to translate the emergency diesel generator (EDG) fuel oil storage design basis into applicable procedures and calculations. Specifically, the required 7-day fuel oil supply did not account for the fact that the fuel oil storage tanks (FOSTs) were shared between the two reactor units. The licensee captured this issue in their Corrective Action Program (CAP) as Action Request (AR) 2015-15019 with a proposed action to revise the applicable calculations and procedures to ensure the FOSTs can supply fuel for seven days while accounting for the diesel fuel oil consumption of both reactor units. The performance deficiency was determined to be more than minor because it was associated 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. The finding screened as of very low safety significance (Green) because it did not result in the loss of operability or functionality of the mitigating systems. Specifically, the licensee performed a past operability review and reasonable determined the FOST remained operable because fuel oil volume was maintained greater than the value established by calculation MD-12-DG-004-N. In addition, the availability of a fuel oil low level alarm with an administrative setpoint greater than the value established by this calculation and the expected relatively slow FOST depletion would have reasonably prompted and allowed operators to initiate actions to conserve fuel had an event occurred. The team did not identify a cross-cutting aspect associated with this finding because it was an original design issue; therefore, it was not reflective of current performance. |
Site: | Cook |
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Report | IR 05000315/2015008 Section 1R21 |
Date counted | Dec 31, 2015 (2015Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21M |
Inspectors (proximate) | A Dunlop B Parks C Baron C Lipa L Smith M Jeffers N Feliz-Adorno R Walton S Kobylarz |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
INPO aspect | |
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Finding - Cook - IR 05000315/2015008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2015Q4
Self-Identified List (Cook)
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