05000368/FIN-2012007-03
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Finding | |
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| Title | Failure to Translate Unit 2 Emergency Feedwater Pump Runout Flow Condition Into Net Positive Suction Head and Diesel Load Calculation |
| Description | The team identified a Green non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states, in part, that measures shall be established to assure that applicable regulatory requirements and the design basis, as defined in 50.2 and as specified in the license application, for those structures, systems, and components to which this appendix applies are correctly translated into specifications, drawings, procedures, and instructions. Specifically, prior to March 16, 2012, the licensee failed to ensure that design basis information associated with the emergency feedwater pump runout conditions were correctly translated into design basis calculations for required net positive suction head, pump motor requirements, and emergency diesel generator loading. This finding was entered into the licensees corrective action program as Condition Report CR-ANO-2-2012-00501. The team determined that the failure to translate the correct brake horsepower during runout conditions for the emergency feedwater pump 2P-7B pump impeller into design basis calculations for required net positive suction head and emergency diesel generator loads was a performance deficiency. This finding was more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to correctly translate the actual brake horsepower resulted in the reduction of available emergency diesel generator capacity margin from 3 percent to 1.6 percent. This represented a 47 percent decrease in margin on a low margin component. In accordance with NRC Inspection Manual Chapter 0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance (Green) because it was a design or qualification deficiency confirmed not to result in a loss of operability or functionality. This finding did not have a crosscutting aspect because the most significant contributor did not reflect current licensee performance. |
| Site: | Arkansas Nuclear  |
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| Report | IR 05000368/2012007 Section 1R21 |
| Date counted | Mar 31, 2012 (2012Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | C Steely N Okonkwo S Kobylarz T Farnholtz A Fairbanks C Baron C Denissen |
| INPO aspect | |
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Finding - Arkansas Nuclear - IR 05000368/2012007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2012Q1
Self-Identified List (Arkansas Nuclear)
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