05000482/FIN-2013008-06
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Finding | |
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Title | Failure to Fully Implement Electrical Protection Criteria for Containment Penetrations |
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 23, 2010, the licensee failed to verify that Calculation A-06-W meet all of the criteria identified in the Updated Safety Analysis Report, Section 8.1.4.3. The team determined that the criteria identified in the Updated Safety Analysis Report was not met for several circuits, where the vertical intercept of the magnetic only circuit breaker time-current curve overlaps the penetration conductor damage curve. This indicates that, for a sustained short circuit of a certain magnitude, the thermal limit of the conductor passing through a penetration could be exceeded without tripping of the magnetic-only circuit breaker. The licensee has entered this issue into their corrective action program as Condition Report CR-73124. The team determined that the licensees failure to ensure that containment penetrations are properly sized to meet the Updated Safety Analysis Report, Section 8.1.4.3, requirements was a performance deficiency. This finding was more than minor because it was associated with the Configuration Control attribute of the Reactor Safety, Barrier Integrity Cornerstone and adversely affected the cornerstone objective to ensure that physical design barriers protect the public from radionuclide releases caused by accidents or events. Specifically, the thermal limit of the penetration conductor could be exceeded without tripping the magnetic-only circuit breaker, jeopardizing the integrity of the electrical penetration. In accordance with NRC Inspection Manual Chapter 0609, Appendix A, Exhibit 3, Barrier Integrity Screening Questions, the finding was determined to have very low safety significance (Green), because it did not result in an actual open pathway in containment and did not involve hydrogen igniters. This finding did not have a cross-cutting aspect because the most significant contributor to the performance deficiency did not reflect current licensee performance. |
Site: | Wolf Creek |
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Report | IR 05000482/2013008 Section 1R21 |
Date counted | Sep 30, 2013 (2013Q3) |
Type: | NCV: Green |
cornerstone | Barrier Integrity |
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 |
INPO aspect | |
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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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