05000341/FIN-2017007-01
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Finding | |
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| Title | Failure to Correct a Design Deficiency that Mis-Quantified Unidentified Leakage |
| Description | Green . The inspectors identified a finding of very low safety significance with an associated NCV of Title 10 of the Code of Federal Regulations (10 CFR) , Part 50, Appendix B, Criterion XVI, Corrective Actions , for the licensees failure to correct a design deficiency that mis -quantified unidentified leakage from reactor coolant system (RCS ) pressure boundary . Specifically, in April 2007, the licensee identified that the driver mount drain for the reactor recirculation pump could potentially drain leakage from nearby pipe cracks to the identified leakage collection point. However, the licensee had 3 not correct ed this design deficiency as of the start of this inspection. The licensee documented this issue into the CAP as Condition Assessment Resolution Document (CARD) 17 25489 and developed a night order to direct the operators how to calculate unidentified leakage. The licensee also planned to revise procedure 24.000.02 as an interim measure until the modification was implemented. The inspectors determined that the licensees failure to correct the design deficiency that mis-quantified unidentified leakage is a performance deficiency that is reasonably within the licensees ability to foresee and correct. The inspectors determined that this issue is more than minor because if left uncorrected, the performance deficiency has the potential to lead to a more significant safety concern. Specifically, leakage that would normally be collected and measured as unidentified leakage could be collected and measured as identified leakage, leading to a potential violation of the TS unidentified leakage rate . Because the finding did not represent a loss of system or function, or represent an actual loss of function of at least a single train for greater than its Technical Specification (TS) Allowed Outage Time, or represent an actual loss of function of one or more non TS trains of equipment designated as high safety -significant in the licensees Maintenance Rule Program, it was screened as very low safety significance. The inspectors did not identify a cross -cutting aspect since the issue originated more than three years ago. |
| Site: | Fermi  |
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| Report | IR 05000341/2017007 Section 4OA2 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Ng P Smagacz V Meghani M Jones B Dickson |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| INPO aspect | |
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Finding - Fermi - IR 05000341/2017007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2017Q2
Self-Identified List (Fermi)
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