05000313/FIN-2010004-02
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Finding | |
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| Title | Failure to Promptly Identify and Correct a Condition Adverse to Quality Associated with Emergency Diesel Generators Heating, Ventilation, and Air Conditioning Ducting Susceptibility to Tornado Loading |
| Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the failure of the licensee to promptly identify and correct a known condition adverse to quality associated with the susceptibility of the emergency diesel generators heating, ventilating and air conditioning ducting to loading effects caused by natural phenomena, such as tornados. Specifically, while performing a review in response to an NRC generic communication, the licensee determined that they could not demonstrate the ability of the station\'s emergency diesel generators\' heating, ventilating and air conditioning ducting to withstand a tornado depressurization event. However no actions were taken to correct or mitigate this issue at the time of discovery. The licensee entered this issue in their corrective action program as Condition Report CR-ANO-C-2009-2296. Failure to promptly identify and correct a known condition adverse to quality associated with the susceptibility of the Unit 1 emergency diesel generators\' heating, ventilating and air conditioning ducting to loading effects caused by natural phenomena, tornados, was a performance deficiency. The performance deficiency was determined to be more than minor because it was associated with the protection against external events 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 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 the system or train; (3) did not result in the loss of one or more trains of nontechnical specification equipment; and (4) 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 the licensee failed to use conservative assumptions in decision making and adopt a requirement to demonstrate that the proposed action is safe in order to proceed rather than a requirement to it is unsafe in order to disapprove the action. |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2010004 Section 1R15 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| 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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