05000313/FIN-2011005-01
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Finding | |
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| Title | Exceeded Technical Specification Allowed Completion Time for Electrical Power Systems |
| Description | The inspectors identified a non-cited violation of Unit 1 Technical Specification 3.8.4, DC Sources-Operating, Technical Specification 3.8.7, Inverters- Operating, and Technical Specification 3.8.9, Distribution Systems-Operating, due to the licensees failure to complete the associated required action prior to the specified completion time while the associated emergency switchgear room chillers were out of service for planned maintenance. The licensee immediately implemented corrective actions to direct Operations to enter the applicable technical specifications and notify ANO management. The issue was identified to the licensee and entered into their corrective action program as Condition Report CR-ANO-1-2012-0043. The inspectors determined that not completing the required actions for the applicable technical specifications prior to the specified completion time while the associated emergency switchgear room chillers were out of service for planned maintenance is a performance deficiency. The performance deficiency is determined to be more than minor because it is associated with the equipment performance attribute of the Mitigating Systems Cornerstone, and adversely affects the associated cornerstone objective to ensure availability, reliability, and the capability of systems that respond to initiating events to prevent undesirable consequences and is therefore a finding. Specifically, on December 7, 2011, the failure to complete the required actions prior to the specified completion times for Technical Specification 3.8.4, DC Sources Operating, Technical Specification 3.8.7, Inverters Operating, and Technical Specification 3.8.9, Distribution Systems Operating, after removing the VCH-4A from service for maintenance was a violation of technical specifications. Additionally, on December 19, 2011, the failure to complete the required actions prior to the specified completion time for Technical Specification 3.8.7, Inverters Operating, after removing the VCH-4B from service for maintenance was a violation of technical specifications. Using Inspection Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the finding was determined to require a Phase 2 analysis because removing each VCH-4 chiller from service in December 2011 did result in an actual loss of safety function of a single train for greater than its technical specification allowed completion time. A phase 2 analysis from a previous non-cited violation that bounds this issue determined the finding to be of very low safety significance (Green). Specifically, although the function was lost by the designated support equipment (emergency switchgear chillers), the licensee had an evaluation that credited compensatory measures and specific environmental conditions that assured the overall functionality of the applicable switchgear train was not lost. The finding was determined to have a cross-cutting aspect in the area of human performance, associated with the decision making component, in that the licensee did not 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 that it is unsafe in order to disapprove the action H.1(b) |
| Site: | Arkansas Nuclear  |
|---|---|
| Report | IR 05000313/2011005 Section 1R15 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | A Sanchez D Allen G Guerra J Rotton M Williams R Kopriva W Schaup |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Arkansas Nuclear - IR 05000313/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Arkansas Nuclear) @ 2011Q4
Self-Identified List (Arkansas Nuclear)
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