05000341/FIN-2016003-01
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Finding | |
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Title | Failure to Perform an Operability Determination for Division 1 RPV Reference Leg Backfill System Not Providing Adequate Flow |
Description | The inspectors identified a finding of very low safety significance with an associated non-cited violation of Title 10 of the Code of Federal Regulation (10 CFR) 50, Appendix B, Criterion V, "Instructions, Procedures, and Drawings," for the licensees failure to complete an operability determination as required by plant procedures. Specifically, the licensee failed to perform an operability determination for a degraded/non-conforming condition described in CARD 1625608, Division 1 RPV [Reactor Pressure Vessel] Reference Leg Backfill System Not Meeting Minimum Recommended Flow, to assess the impact on affected RPV level and pressure instrumentation when the minimum reference leg backfill flow rate could not be maintained. The licensee entered this violation into its CAP for evaluation and identification of appropriate corrective actions. An operability determination was subsequently documented in CARD 1625608. The finding was of more than minor safety significance because it was related to the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to perform an operability determination for the degraded/nonconforming condition could potentially have led to inoperable RPV level and pressure instruments without the licensees knowledge. In this case, during an event involving a rapid depressurization of the RPV, the affected instruments may have caused later than expected initiation of the required automatic actuation signals for the reactor protection system and emergency core cooling system and may have provided operators with erroneous indications. The finding was determined to be of very low safety significance because it did not represent an actual loss of function of a single train for greater than its Technical Specification (TS) allowed outage time nor did it represent a loss of function of a non-TS train designated as high safety significant in accordance with the licensees Maintenance Rule Program. The inspectors determined this finding affected the cross-cutting area of problem identification and resolution and the cross-cutting aspect of evaluation. The licensee did not thoroughly evaluate the problem after it was identified with respect to the effect the degraded/non-conforming condition would have on operability of the RPV level and pressure instruments commensurate with their safety significance [IMC 0310 P.2] |
Site: | Fermi |
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Report | IR 05000341/2016003 Section 1R15 |
Date counted | Sep 30, 2016 (2016Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | B Dickson B Kemker J Bozga P Smagacz R Edwards V Meghani V Myers |
Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion V |
CCA | P.2, Evaluation |
INPO aspect | PI.2 |
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Finding - Fermi - IR 05000341/2016003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2016Q3
Self-Identified List (Fermi)
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