05000313/FIN-2010004-03
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Finding | |
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| Title | Failure to Promptly Identify and Correct a Condition Adverse to Quality Associated with Emergency Switchgear Chiller VCH-4A |
| Description | The inspectors documented a self-revealing noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to promptly identify and correct a known condition adverse to quality associated with the improper setup of the dead band of service water flow control valve CV-6034 for cold weather operation. This resulted in the pressure control valve not properly modulating in response to pressure control inputs, resulting in emergency switchgear chiller VCH-4A tripping on high discharge pressure. The licensee entered this issue in their corrective action program as Condition Report CR-ANO-1-2009-2212. Failure to promptly identify and correct a known condition adverse to quality associated with the improper setup of the dead band of service water flow control valve CV-6034 for cold weather operation 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 the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences, and is therefore a finding. Using Manual Chapter 0609.04, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance because: (1) the finding was not a qualification deficiency that resulted in a loss of functionality of chiller VCH-4A; (2) it did not lead to an actual loss of safety function of the system or train; (3) it did not result in an actual loss of safety function of a single train for greater than its technical specification allowed outage time; (4) it did not represent an actual loss of safety function of one or more non-technical specification trains of equipment designated as risk-significant per 10 CFR 50.65, for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />; and (5) it did not screen as potentially risk-significant due to a seismic, flooding, or severe weather initiating event. The finding was determined to have a crosscutting aspect in the area of human performance, associated with decision making in that, although the licensee had identified the vulnerability of the VCH-4A chiller, decided not to pursue the corrective actions to adjust the dead band for valve CV-6034 and resulted in the subsequent improper operation of the valve. |
| Site: | Arkansas Nuclear  |
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| Report | IR 05000313/2010004 Section 1R18 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | A Sanchez C Graves C Osterholtz D Stearns D Strickland J Clark J Josey J Rotton K Clayton L Ricketson T Pate |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2010004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2010Q3
Self-Identified List (Arkansas Nuclear)
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