05000341/FIN-2009003-03
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Finding | |
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Title | Failure to Adequately Control Potential Debris Source Term in Primary Containment |
Description | The inspectors identified a finding of very low safety significance and associated NCV of 10 CFR 50, Appendix B, Criterion III (Design Control), for the failure to control debris source term inside the drywell. The licensee installed ty-wraps inside the drywell as part of a design modification without performing a debris transport and loading analysis of the emergency core cooling system (ECCS) suction strainers in the torus. Once identified, the licensee performed the analysis and replaced the ty-wraps with ones of an acceptable material. The finding was determined to be more than minor because the failure to control the debris source term inside the primary containment could lead to loss of the ECCS during an accident condition. Specifically the debris could be transported from the drywell to the torus and cause the ECCS strainers to become blocked causing degradation in the ECCS flow during the accident and, therefore, affected the Mitigating Systems Cornerstone. The finding was determined to be of very low safety significance because the engineering analysis determined the ECCS flow rates would remain above the values assumed in the safety analysis and the debris loading did not exceed the structural limits of the strainers. There were no cross-cutting aspects associated with this finding since the deficiency was not reflective of current licensee performance |
Site: | Fermi |
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Report | IR 05000341/2009003 Section 4OA3 |
Date counted | Jun 30, 2009 (2009Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71153 |
Inspectors (proximate) | J Cassidy J Jacobson T Steadham J Rutkowski R Morris J Giessner F Tran E Martinez |
INPO aspect | |
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Finding - Fermi - IR 05000341/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2009Q2
Self-Identified List (Fermi)
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