05000298/FIN-2012003-12
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Finding | |
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Title | Failure to Maintain Design Control of the Essential Ventilation System |
Description | The inspectors identified a non-cited violation of 10 CFR 50 Part 50, Appendix B, Criterion III, Design Control, associated with the licensees failure to ensure that the control buildings essential ventilation system would maintain battery room temperatures such that the batteries would remain operable under all design conditions. Specifically, the essential ventilation system does not provide a heat source for the battery rooms and during cold weather conditions cannot maintain room temperatures above the minimum required for operability without the use of portable heaters. This issue was entered into the licensees corrective action program as Condition Report CR-CNS-2012-00724. The licensees failure to ensure that the essential ventilation system would support battery operability under all design conditions was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the equipment performance attribute of the Mitigating Systems Cornerstone, and affected the associated cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences, and is therefore a finding. Using 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 the finding: (1) was not a design or qualification issue confirmed not to result in a loss of operability or functionality; (2) did not represent an actual loss of safety function of system or train; (3) did not result in the loss of one or more trains of nontechnical specification equipment; (4) did not screen as potentially risk significant due to seismic, flooding, or server weather initiating event. This finding had a cross-cutting aspect in the area of human performance associated with the decision-making component because the licensee failed to conduct adequate effectiveness reviews of safety-significant decisions to verify the validity of the underlying assumptions, and identify possible unintended consequences. Specifically, the licensee failed to recognize the use of portable heaters as a manual action which indicated an inadequate ventilation design. |
Site: | Cooper |
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Report | IR 05000298/2012003 Section 4OA2 |
Date counted | Jun 30, 2012 (2012Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | G Pick G George L Carson J Josey V Gaddy C Alldredge B Hagar C Henderson |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Cooper - IR 05000298/2012003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2012Q2
Self-Identified List (Cooper)
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