05000423/FIN-2014013-02
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Finding | |
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Title | Failure to Identify and Correct Adverse Conditions related to the Turbine Driven Auxiliary Feedwater Pump Governor to Control Valve Linkage |
Description | The Team identified a Green NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Actions associated with the failure to identify and correct adverse conditions related to the TDAFW pump governor to control valve linkage which potentially could have affected the reliability of the pump. Specifically, previously unidentified cam-plate pivot bushing wear and non-optimal linkage setup allowed degradation of the cam-follower spherical bearing and potential linkage sluggishness and binding from February 4 to October 29, 2014, when the unit entered a refueling outage. Dominion addressed these linkage issues during the refueling outage and entered this issue into their corrective action program as condition report 563885. This finding was more than minor because it represented a challenge to the equipment performance attribute of the Reactor Safety Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Leaving the control linkage misalignment issues uncorrected could have reduced the reliability of the TDAFW pump. This issue was of very low safety significance because there was no loss of TDAFW operability or functionality. The linkage issues had no impact on TDAFW pump functionality based on satisfactory surveillance test results. The Team determined that this issue had a crosscutting aspect in the Human Performance cross-cutting area associated with Conservative Bias, in that Dominion failed to identify the potential importance of deficiencies in the control linkage configuration. |
Site: | Millstone |
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Report | IR 05000423/2014013 Section 4OA5 |
Date counted | Dec 31, 2014 (2014Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93812 |
Inspectors (proximate) | J Rogge L Mckown W Schmidt D Orr J Deboer |
Violation of: | 10 CFR 50 Appendix B Criterion XVI |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Millstone - IR 05000423/2014013 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2014Q4
Self-Identified List (Millstone)
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