05000254/FIN-2017002-03
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Finding | |
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| Title | Failure to Justify MSIV Maintenance Deferral |
| Description | The inspectors identified a finding of very low safety significance for the licensees failure to provide an adequate technical justification for deferral of a preventative maintenance task to replace or refurbish the Unit 1 2D main steam isolation valve (MSIV) in accordance with WCAA120, Preventive Maintenance (PM) Database Revision Requirements. Specifically, overhaul or replacement of the 2D MSIV was deferred despite the historical performance of the valve, the as-found test results during Q1R24, and the amount of time that was available to plan for the overhaul to meet the maintenance strategy requirement of every seventh outage. Corrective actions for this issue included the licensee scheduling replacement of the Unit 1 2D MSIV during the next scheduled refueling outage (RFO). This issue was captured in the licensees corrective action program (CAP) as Issue Report (IR) 4017529.The inspectors determined the performance deficiency was more than minor because it was associated with the Initiating Events Cornerstone attribute of Equipment Performance and impacted the cornerstone objective because the MSIV preventive maintenance overhaul/replacement frequency was not effectively managed to ensure the reliability of the MSIV closure time performance to meet Technical Specification (TS) requirements on a consistent basis. The inspectors determined the finding could be evaluated using IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 1, for the Initiating Events screening questions and determined the finding was of very low safety significance. The inspectors determined the finding had a cross-cutting aspect in the area of Human Performance, Conservative Bias, which states, Individuals use the decision making practices that emphasize prudent choices over those that are simply allowable [H.14]. |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2017002 Section 4OA2 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Murray K Carrington J Cassidy A Dahbur A Dunlop J Steffes J Stewart C Mathews K Stoedter |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Quad Cities - IR 05000254/2017002 | |||||||||||||||||||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2017Q2
Self-Identified List (Quad Cities)
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