05000317/FIN-2009006-04
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Finding | |
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Title | Inadequate Design Control for Potential Air Entrainment in the ECCS |
Description | The team identified a finding of very low safety significance involving a non-cited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, in that, Constellation did not ensure the adequacy of the emergency core cooling system (ECCS) design under post-accident conditions. Specifically, Constellation had not performed adequate analyses or testing to evaluate the potential impact of air being entrained in the flow from the refueling water tank (RWT) during the transition of the ECCS from the RWT to the containment sump. In response, Constellation entered this issue into their corrective action program and performed analyses to demonstrate that this condition did not render associated equipment inoperable. This finding is more than minor because it is associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The team determined the finding was of verylow safety significance (Green) because it was a design or qualification deficiency confirmed not to result in a loss of ECCS operability or functionality. This finding did not have a cross-cutting aspect because the most significant contributor of the performance deficiency was not reflective of current licensee performance |
Site: | Calvert Cliffs |
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Report | IR 05000317/2009006 Section 1R21 |
Date counted | Sep 30, 2009 (2009Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | J Lilliendahl S Pindale C Baron G Skinner F Arner L Doerflein M Halter |
INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2009Q3
Self-Identified List (Calvert Cliffs)
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