05000341/FIN-2016001-02
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Finding | |
|---|---|
| Title | Failure to Correctly Interpret and Implement TS Requirements for RPS Trip Functions |
| Description | The inspectors identified a finding of very low safety significance with an associated NCV of TS 5.4, Procedures. Specifically, the licensee failed to enter TS 3.3.1.1, Condition C when the high pressure stop valve (HPSV) closure and high pressure control valve (HPCV) fast closure reactor protection system (RPS) trip functions became inoperable while the main turbine bypass valves cycled open during a plant transient on January 6, 2016. The licensee entered this issue into the corrective action program for evaluation and identification of appropriate corrective actions. As an immediate corrective action, the licensee established an expectation to enter TS 3.3.1.1, Condition C, when the main turbine bypass valves are open above 29.5 percent power and declare the HPSV closure and HPCV fast closure RPS trip functions inoperable pending another resolution. The performance deficiency was of more than minor safety significance because a failure to correctly implement TS Limiting Condition for Operation (LCO) requirements has the potential to lead to a more significant safety concern if left uncorrected. Specifically, a failure to declare an LCO not met, enter the applicable condition(s), and follow the applicable actions could reasonably result in operations outside of established safety margins or analyses. The finding was determined to be of very low safety significance based on a detailed significance determination process review since the delta core damage frequency was determined to be less than 1.0E-6/year. The inspectors concluded this finding affected the cross-cutting aspect of conservative bias in the human performance area. Specifically, the licensee failed to correctly interpret and implement the TS requirements due to a non-conservative interpretation of the TS Bases and a failure to reconcile differences between information in the annunciator response procedure and the TS Bases [IMC 0310, H.14]. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2016001 Section 1R12 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | B Dickson B Kemker J Nance P Smagacz |
| Violation of: | Technical Specification - Procedures |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Fermi - IR 05000341/2016001 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2016Q1
Self-Identified List (Fermi)
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