05000397/FIN-2016004-03
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Finding | |
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| Title | Flow Indicating Switch Adjustment |
| Description | Green. The inspectors reviewed a self-revealed, non-cited violation of Technical Specification 5.4.1.a, Procedures, for the licensees failure to implement adequate work instructions for performing maintenance on residual heat removal flow indicating switch RHR-FIS-10B. Specifically, the flow indicating switchs upper drive arm and internal mechanical stops were improperly adjusted which led to increased internal friction. As a result, the associated minimum flow control valve, RHR-FCV-64B, failed to open when securing the system from a surveillance test. As an immediate corrective action, the licensee declared the Division 2 RHR system inoperable, replaced the flow indicating switch, and performed post-maintenance testing. The licensee entered this issue into the corrective action program as Action Request 355027. The failure to implement adequate work instructions for performing maintenance on residual heat removal flow indicating switch RHR-FIS-10B was a performance deficiency. Specifically, the flow indicating switchs upper drive arm and internal mechanical stops were improperly adjusted which led to increased internal friction. As a result, the associated minimum flow control valve, RHR-FCV-64B, failed to open when securing the system from a surveillance test. The performance deficiency was more than minor, and therefore a finding, because it affected the equipment performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, RHR-FIS-10B failed to change state, the Division 2 RHR system was declared inoperable, and the licensee replaced the flow indicating switch. The inspector performed the initial significance determination using NRC Inspection Manual Chapter 0609, Appendix A, Exhibit 2, Mitigating Systems Screening Questions. The inspectors determined that the finding was of very low safety significance (Green) because: (1) the finding was not a deficiency affecting the design or qualification of a mitigating system; (2) the finding did not represent a loss of system and/or function; (3) the finding did not represent an actual loss of function of a single train for greater than its technical specification allowed outage time; and (4) the finding did not represent an actual loss of function of one or more nontechnical specification trains of equipment designated as high safety-significant in accordance with the licensees maintenance rule program for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This finding had a cross-cutting aspect in the area of human performance, avoid complacency, in that the licensee failed to recognize and plan for the possibility of mistakes, latent issues, and inherent risk, even while expecting successful outcomes. Specifically, the station technicians did not recognize their improper adjustment of the flow indicating switch could lead to failure although training was given on adjustments [H.12]. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2016004 Section 1R15 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | C Osterholtz D Bradley G Kolcum J Groom J Kirkland S Hedger T. Lamb |
| Violation of: | Technical Specification - Procedures |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Columbia - IR 05000397/2016004 | ||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2016Q4
Self-Identified List (Columbia)
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