05000482/FIN-2013008-02
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Finding | |
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Title | Failure to Verify or Check the Adequacy of Design Calculations |
Description | The team identified a Green, non-cited violation, with three examples, 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 September 12, 2011, the licensee failed to verify or check the adequacy of design Calculation XX-E-006, AC System Analysis, Revision 6, by 1) not recognizing that the actual switchyard voltage could be lower than the calculated minimum voltage due to loop uncertainties of the switchyard voltmeters, 2) failing to provide a comparison between postulated loading levels and equipment ratings for distribution equipment, in order to verify that overloading conditions would not occur, and 3) not placing limits on the voltages on the Class 1E 480 Vac system which could exceed the allowable maximum equipment voltage rating of 506 Vac. The licensee has entered these issues into their corrective action program as Condition Reports CR-73244, CR-73240, and CR-73206. The team determined that the licensees failure to verify or check the adequacy of design Calculation XX E 006, AC System Analysis, Revision 6, 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, the licensee failed to verify or check the adequacy of design Calculation XX-E-006, AC System Analysis, Revision 6, regarding loop uncertainties of the switchyard voltmeters, equipment loading, and maximum allowed Class 1E 480 voltage. In accordance with NRC 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 cross-cutting 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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