05000331/FIN-2014011-02
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Finding | |
|---|---|
| Title | Inadequate Coating Strainer Debris Loading Calculation |
| Description | The team identified a finding having very-low safety significance and a Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to account for all unqualified coating debris available for transport to the ECCS strainers. Specifically, the licensee relied on assumptions that were inconsistent with their licensing basis, resulting in a non-conservative unqualified coating debris loading value which was used in the strainer hydraulic calculations. This finding was entered into the licensees CAP to evaluate and resolve, including correction of th
affected calculations. The performance deficiency was determined to be more than minor because it was associated with the Mitigating System 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. The finding screened as very-low safety significance (Green) because it did not result in the loss of operability or functionality. Specifically, the licensee removed conservatisms from the calculations, added the additional unqualified coating debris loading, and reasonably determined the system remained operable. The unqualified torus coating debris associated with the apparent violation did not affect this finding. The team did not identify a cross-cutting aspect associated with this finding because it was not indicative of current licensee performance due to the age of the performance deficiency. |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2014011 Section 4OA5 |
| Date counted | Mar 31, 2015 (2015Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 93812 |
| Inspectors (proximate) | C Zoia J Mancuso K O'Brien M Jones M Yoder N Feliz-Adorno S Smith |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Duane Arnold - IR 05000331/2014011 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2015Q1
Self-Identified List (Duane Arnold)
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