05000482/FIN-2013008-05
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Finding | |
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Title | Failure to Ensure Motors are Operated Within their Thermal Limits |
Description | The team identified a Green, non-cited violation of 10 CFR 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. The design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. Specifically, on June 26, 2013, the licensee issued drawing E-11005, List of Loads Supplied by Emergency Diesel Generator, Revision 39, that identified certain motors with load brake horsepower in excess of the motor nameplate ratings, but failed to verify that the excess horsepower would not result in the motors exceeding their thermal design limits. Additionally, the brake horsepower values on the referenced drawing do not reflect the worst-case condition, which would occur when the diesel generator is operating at maximum allowable frequency and powering the motors. The licensee has entered this issue into their corrective action program as Condition Report CR-72945. The team determined that the licensees failure to evaluate motor loading to confirm margin exists to prevent overheating of the motors was a performance deficiency. This finding was more than minor because it was associated with the Design Control attribute of the Reactor Safety, Mitigating Systems Cornerstone 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, motors serving loads with demands in excess of the motor horsepower ratings were not analyzed to ensure that overheating would not occur. In accordance with Inspection Manual Chapter 0609 Appendix A, Exhibit 2, the inspectors determined the finding was of very low safety significance (Green), because the finding was not a design deficiency and did not result in the loss of operability or functionality. This finding had a crosscutting aspect in the area of Human Performance, associated with the Resources component, because the licensee failed to ensure that personnel, equipment, procedures, and other resources are adequate to assure nuclear safety by maintaining long term plant safety by maintenance of design margins. |
Site: | Wolf Creek |
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Report | IR 05000482/2013008 Section 1R21 |
Date counted | Sep 30, 2013 (2013Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | S Garchow B Correll A Sengupta H Leake R Kopriva T Farnholtz |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
CCA | H.6, Design Margins |
INPO aspect | WP.2 |
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Finding - Wolf Creek - IR 05000482/2013008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2013Q3
Self-Identified List (Wolf Creek)
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