05000373/FIN-2012004-01
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Finding | |
|---|---|
| Title | Lack of Adequate Design Review of Effects of Fish Kills on Systems Needed During an Ultimate Heat Sink Design Basis Accident |
| Description | The inspectors identified a finding of very low safety significance and associated NCV of Title 10 of the Code of Federal Regulations (CFR) Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to adequately verify the adequacy of the design of systems needed during a design basis accident. Specifically, the inspectors identified the licensee failed to evaluate the effects of fish mortality resulting from the elevated ultimate heat sink (UHS) temperatures predicted to occur during design basis accidents. The licensee entered the issue into its corrective action program (CAP) and based on engineering judgment, concluded the fish mortality or fish kills would not prevent systems from performing their safety functions during a design basis accident. The performance deficiency was determined to be more than minor because it was associated with the Mitigating Systems Cornerstone attribute of design control and adversely affected the cornerstone objective of ensuring the capability of the system to respond to an initiating event to prevent undesirable consequences. Specifically, based on previous operating experience, there was reasonable doubt equipment would remain operable due to the anticipated fish kill from elevated lake temperatures if a design basis accident had occurred. The finding was screened as very low safety significance (Green) because the design deficiency did not result in a loss of operability or functionality. The inspectors determined the finding had a cross-cutting aspect in the area of problem identification and resolution because the licensee did not adequately analyze the potential adverse effects of fish kills on systems needed during design basis accidents when evaluating the adverse affects of the high UHS temperatures during an August 13, 2010, event. |
| Site: | LaSalle  |
|---|---|
| Report | IR 05000373/2012004 Section 1R07 |
| Date counted | Sep 30, 2012 (2012Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.07 |
| Inspectors (proximate) | A Shaikh B Kemker F Ramirez J Bozga J Jandovitz L Jones M Kunowski M Ziolkowski N Feliz Adorno R Ruiz R Schulz |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - LaSalle - IR 05000373/2012004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2012Q3
Self-Identified List (LaSalle)
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