05000254/FIN-2017001-01
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Finding | |
|---|---|
| Title | Failure to Ensure Hardware Secure for Breaker MOC Switch Linkage |
| Description | Green . A finding of very low safety significance and an associated NCV of 10 CFR 50, Appendix B, Criterion V was self -revealed on January 27, 2017, when the Unit 1C residual heat removal service water (RHRSW ) pump was started for a routine surveillance evolution and all expected annunciators and equipment failed to operate properly, which led to the licensee declaring the Unit 1C RHRSW pump inoperable. Specifically, t he licensee failed to establish a procedure for the mechanism operated contact (MOC) switch linkage arm that was appropriate to the circumstances to ensure the component would c ontinue to perform its function. Immediate corrective actions included reconnecting the MOC switch linkage arm assembly and test ing it by starting the 1C RHRSW pump prior to declaring the pump operable. In addition, the licensee planned procedure revisions to QCEPM 0200 11 that would specify a torque value to ensure the MOC switch linkage arm was adequately secured and could perform its function. Th is issue was entered into the licensees corrective action program as Issue Report 3967424 . The finding was determined to be more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of equipment performance and 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 ensure the MOC switch linkage arm was adequately fastened led to the failure of the component and its associated Unit 1C RHRSW pump d uring breaker operation on January 27, 2017. T he finding was determined to be of very low safety significance (Green), because the inspectors answered No to all of the questions in IMC 0609, Appendix A, The Significance Determination Process for Findings at Power , Exhibit 2, Mitigating Systems Screening Questions, Section A, Mitigating SSCs and Functionality. The inspectors determined this finding affected the cross- cutting area of human performance, in the aspect of avoid complacency, which state s, Individuals recognize and plan for the possibility of mistakes, latent issues, and inherent risk, even while expecting successful outcomes. Specifically, the licensee failed to recognize a potential risk and inherent latent issue for a condition identified in 2015 at Quad Cities, when a MOC switch failed to perform its function due to a missing nut in a different breakers linkage assembly. The licensee identified and corrected the 3 condition but failed to evaluate the cause of the missing nut because it did not impact the operability of the component . I n the 2015 instance, the MOC switch issue only affected indications for the component and had no adverse impact on the ability of the component to perform its function [H.12 ]. |
| Site: | Quad Cities  |
|---|---|
| Report | IR 05000254/2017001 Section 4OA2 |
| Date counted | Mar 31, 2017 (2017Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Dahbur C Mathews J Cassidy J Neurauter K Carrington K Stoedter M Domke M Garza R Murray V Meyers |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Quad Cities - IR 05000254/2017001 | |||||||||||||||||||||||||||
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Finding List (Quad Cities) @ 2017Q1
Self-Identified List (Quad Cities)
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