05000482/FIN-2012004-03
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Finding | |
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Title | SAFETY-RELATED Fan Flow Rate Acceptance Criteria Reduced Below Design Basis Limit |
Description | On July 9, 2012, the inspectors identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, for inappropriately reducing the vital air conditioning unit fan flow rate test acceptance criteria to a value less than that used in the Updated Safety Analysis Report and supporting calculations. The inspectors identified that the train B air conditioning unit fan SGK05B improperly passed its surveillance test, procedure STS PE-16B, on June 8, 2011, at 10,472 cfm when the design flow rate is 11,500 cfm. A flow rate of 11,500 cfm was specified in all of Wolf Creeks design basis calculations. Reviewing the history, the inspectors found condition report 2001-3149 led to changing the test acceptance criteria on January 15, 2002. In that change, Wolf Creek misapplied standards for filtration and charcoal absorber units to the control building air conditioning units in order to justify reducing the minimum flow rate acceptance criteria by 10 percent for procedures STS PE-16A and -16B, Train A[B] Class IE Elect System A/C System Flow Rate Verification, Revision 2. Wolf Creek initiated condition report 54791 and assessed the reduced flow rate impact in operability evaluation GK-12-011. Changing surveillance test acceptance criteria by incorrectly applying standards while lowering the acceptance criteria below the minimum required flow rate is a performance deficiency. The performance deficiency is more than minor because it impacted the design control attribute of the Mitigating Systems Cornerstone and affected the objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, this finding was screened to a Green because operability evaluation GK-12-011 demonstrated that the train B vital air condition unit had approximately 0.7 percent margin to cool the train B batteries, battery chargers, switchgear, and inverters. Therefore, there was not a loss of operability or functionality of a risk significant component. This issue did not screen as significant for fires, floods, or seismic events. The inspectors found the cause of the finding was not indicative of current performance because the inappropriate test procedure changes were made approximately 11 years ago |
Site: | Wolf Creek |
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Report | IR 05000482/2012004 Section 1R22 |
Date counted | Sep 30, 2012 (2012Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.22 |
Inspectors (proximate) | C Long C Peabody C Speer G Guerra J Laughlin J Watkins L Ricketson N Greene N Makris N O'Keefe R Kopriva S Hedger |
INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2012004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2012Q3
Self-Identified List (Wolf Creek)
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