05000416/FIN-2015007-10
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Finding | |
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Title | Failure to Ensure Equipment Operability and Functionality of Allowable Alternating Current Frequency Range |
Description | The team identified a Green, non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states, in part, 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, prior to August 14, 2015, the licensee failed to verify that the safety-related alternating current equipment will operate satisfactorily at the extremes of the allowable alternating current frequency ranges as specified in the updated final safety analysis report and technical specifications. This finding was entered into the licensees corrective action program as Condition Report CR-GGN-2015-4672. The team determined that the failure to verify safety-related alternating current equipment for operation at the extremes of the allowed frequency range was a performance deficiency. This performance deficiency was more than minor, and therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of safety systems that respond to initiating events to prevent undesirable consequences. Specifically, lack of verification that the alternating current equipment would function at the extremes of the allowable frequency range can result in incorrect conclusions regarding the ability of the equipment to meet its design bases. 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 finding was determined to have 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 problem identification and resolution crosscutting aspect associated with self-assessments, because the organization failed to conduct self-critical and objective assessment of its programs and policies. |
Site: | Grand Gulf |
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Report | IR 05000416/2015007 Section 1R21 |
Date counted | Dec 31, 2015 (2015Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | D Loveless H Leake J Watkins L Brandt R Latta T Farnholtz W Sherbin J Mchugh |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
CCA | P.6, Self-Assessment |
INPO aspect | CL.2 |
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Finding - Grand Gulf - IR 05000416/2015007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2015Q4
Self-Identified List (Grand Gulf)
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