05000336/FIN-2016001-02
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Finding | |
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| Title | Failure of Feedwater Isolation Valve to Close Due to Electrical Jumper Being Installed |
| Description | The inspectors identified a self-revealing Green NCV of TS 3.3.2 for Dominions failure to meet the operability requirements for the C feedwater isolation valve (FWIV) testing and valve limit testing work associated with Design Change MP3-09-01030, an electrical jumper was left installed in the C FWIV (3FWS*CTV41C) control circuit. This prevented both channels of the engineered safety features actuation system (ESFAS) signal from closing the C FWIV when called upon during an actual feedwater isolation actuation associated with the reactor trip on January 25, 2016. The installed jumper rendered the C FWIV inoperable for over one year. Dominions immediate corrective actions included restoring the channels for 3FWS*CTV41C to operable status by removing the electrical jumper, inspecting the other FWIV control circuits for electrical jumpers, and retesting all of the FWIVs for proper operation. The performance deficiency was determined to be more than minor because it adversely affected the configuration control attribute of the Mitigating Systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure to remove an electrical jumper on the C FWIV during the implementation of a design change led to the failure of the valve to perform its closure safety function when called upon. The finding was evaluated in accordance with IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, and determined to be of very low safety significance (Green) since it did not represent an actual loss of safety function of the system as there was a redundant means of feedwater isolation. The finding has a cross-cutting aspect in Human Performance, Work Management, because Dominion did not implement a process of planning, controlling, and executing work activities such that nuclear safety is the overriding priority. Specifically, maintenance and operations personnel did not follow the work management procedure for generating a new work order when the additional electrical jumper was installed [H.5]. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2016001 Section 1R19 |
| Date counted | Mar 31, 2016 (2016Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | C Highley C Newport G Dentel J Ambrosini K Reid L Mckown |
| Violation of: | 10 CFR 50 Appendix A Technical Specification - Procedures Technical Specification |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Millstone - IR 05000336/2016001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2016Q1
Self-Identified List (Millstone)
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