05000483/FIN-2014007-05
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Finding | |
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| Title | Failure to Adequately Analyze Maximum Electrical Equipment Temperatures Resulting from the Single Failure of Control Building Heating Ventilation/Air Conditioning |
| Description | The team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states, in part, Measures shall be established to assure that applicable regulatory requirements and the design basis, are correctly translated into specifications, drawings, procedures, and instructions. These measures shall include provisions to assure that appropriate quality standards are specified and included in design documents and that deviations from such standards are controlled. Specifically, prior to April 25, 2014, the licensee had failed to account for the temperature differences between inside and outside of electrical cabinets in the Class 1E electrical rooms, as well as the effects of these increased temperatures on the components in the cabinets with a single control building chiller out-of-service. In response to this issue, the licensee performed a preliminary review of the calculation and confirmed that the components within the cabinets would continue to function in the event of a transient or accident with a single control building chiller out-of-service. This finding was entered into the licensee's corrective action program as Callaway Action Request (CAR) 201402872. The team determined that the failure to adequately account for increased temperatures within the Class 1E electrical cabinets, and the effect on the components in those cabinets, was a performance deficiency. This finding was more than minor because it adversely affected the Mitigating Systems Cornerstone attribute of Equipment Performance and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to evaluate the increased temperatures within the cabinets in Calculation NAI-1719-001 could establish non-conservative results that could lead to component failures, causing critical electrical equipment not to function. In accordance with Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, dated June 19, 2012, Exhibit 2, Mitigating Systems Screening Questions, the issue screened as having very low safety significance (Green) because it was a design or qualification deficiency that did not represent a loss of operability or functionality; did not represent an actual loss of safety function of the system or train; did not result in the loss of one or more trains of non-technical specification equipment; and did not screen as potentially risk-significant due to seismic, flooding, or severe weather. This finding had a cross-cutting aspect, pertaining to identification, in the area of problem identification, because the licensee did not ensure that the organization implements a corrective action program with a low threshold for identifying issues. Individuals identify issues completely, accurately, and in a timely manner in accordance with the program [P.1]. |
| Site: | Callaway  |
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| Report | IR 05000483/2014007 Section 1R21 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | B Correll C Baron C Hale G Nicely J Braisted R Kopriva S Hedger T Farnholtz |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Callaway - IR 05000483/2014007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2014Q2
Self-Identified List (Callaway)
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