05000445/FIN-2013007-01
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Finding | |
|---|---|
| Title | Inadequate Calculations and Procedures for Offsite Power Availability |
| Description | The inspectors identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, that states, in part, applicable regulatory requirements and design basis are correctly translated into specifications, drawings, procedures, and instructions. Specifically, prior to June 5, 2013, the licensee did not establish that the minimum switchyard voltages established in station procedures were adequate to prevent undesired actuation of the undervoltage protection scheme. This condition resulted from an inadequate analysis of undervoltage relay setpoints in design calculations, and the failure to provide acceptance criteria for undervoltage relay reset setpoints in relay calibration procedures. The finding was entered into the licensees corrective action program as Condition Report CR-2013-006176. The inspectors determined that the failure to properly analyze minimum switchyard voltage requirements, and control relay setpoints necessary to maintain the availability of offsite power was a performance deficiency. The performance deficiency is more-thanminor because it was associated with Reactor Safety, Mitigating Systems Cornerstone, Design Control attribute and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, at the minimum switchyard voltages established in station procedures, actuation of the undervoltage protection scheme could have occurred and removed the reliable offsite power sources during an accident. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 2, the inspectors determined the finding was of very low (Green) safety significance because the finding was not a design deficiency and did not result in the loss of operability or functionality. The finding had a cross-cutting aspect in the Area of Problem Identification and Resolution, associated with the Operating Experience Component, since the issues noted in this finding were discussed in Regulatory Issue Summary (RIS) 2011-12, Adequacy of Station Electric Distribution System Voltages, and RIS 2011-12 was reviewed by the licensee as part of the self assessment conducted in February 2013. |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2013007 Section 1R21 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Farnholtz R Smith G Skinner B Correll C Edwards T Buchanan J Braisted |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Comanche Peak - IR 05000445/2013007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2013Q2
Self-Identified List (Comanche Peak)
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