05000259/FIN-2014004-04
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Finding | |
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Title | Inadequate NPSH Calculations for Standby Liquid Control Pumps |
Description | The NRC identified a Green non-cited violation (NCV) of 10 CFR Part 50
Appendix B, Criterion III, Design Control, for the licensees failure to maintain adequat control measures for verifying or checking the adequacy of design of the Standby Liqui Control (SLC) system. Specifically, the licensees calculations and system testing wer both inadequate to demonstrate that the SLC system could meet design requirement under all required operating conditions. The licensee entered this in their CAP as PE 920418 and initiated corrective actions to perform a modification to the SLC system an update design calculations. The inspectors determined that the licensees failure to maintain adequate control measures for verifying or checking the adequacy of design of the SLC system as required by 10 CFR 50, Appendix B, Criterion III, Design Control, was a performance deficiency (PD). Specifically, the licensees calculations and system testing were both inadequate to demonstrate that the SLC system could meet design requirements under all required operating conditions. The PD was more than minor because it affected the Mitigating Systems Cornerstone attribute of Design Control, and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, there was not an adequate method for ensuring the capability of the design of the SLC system following a design basis accident. The inspectors screened this finding in accordance with IMC 0609, Appendix A, Significance Determination Process, Exhibit 2-Mitigating Systems Screening Questions, dated June 19, 2012, and determined the finding was of very low safety significance (Green) because the design deficiency did not result in a loss of operability or functionality. The inspectors determined that no cross cutting aspect was applicable because this finding was not indicative of current licensee performance and occurred more than three years ago. |
Site: | Browns Ferry ![]() |
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Report | IR 05000259/2014004 Section 1R15 |
Date counted | Sep 30, 2014 (2014Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | A Goldau A Ruh C Scott D Dumbacher G Smith J Bartley L Pressley M Peck R Baldwin T Stephen |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
INPO aspect | |
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Finding - Browns Ferry - IR 05000259/2014004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2014Q3
Self-Identified List (Browns Ferry)
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