05000348/FIN-2017001-01
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Finding | |
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| Title | |
| Description | Green . A self -revealing finding was identified for the failure to maintain a preventive maintenance (PM) task to replace the main steam isolation valve (MS IV) test solenoid valves in accordance with the PM basis. As a result, test solenoid valve N1N11SV3369AG, which was installed for 13 years, failed and, combined with unknown additional air system leakage, led to an inadvertent closure of MSIV Q1N11HV3369A , resulting in a Unit 1 turbine trip/reactor trip with safety injection system actuation on Oct ober 1, 2016. The licensees failure to perform the PM task to replace the MSIV test solenoids in accordance with the PM basis as required by licensee procedure NMP -ES- 006, Preventive Maintenance Implementation and Continuing Equipment Reliability Improvement, Ver. 8.1, section 6.1.1 was a performance deficiency (PD). The PD was more than minor because it was associated with the equipment performance attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during power operations. This finding was of very low safety significance (Green) because the finding did not cause the loss of mitigation equipment relied upon to transition the plant to a stable shutdown condition following the reactor trip. The inspectors determined the finding had a cross - cutting aspect of Trending in the Problem Identification and Resolution (PI&R) area. Prior to this event, there were four documented failures of MSIV test solenoids valves in the last three years that did not get screened for programmatic or common cause issues [P.4]. |
| Site: | Farley  |
|---|---|
| Report | IR 05000348/2017001 Section 4OA3 |
| Date counted | Mar 31, 2017 (2017Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | K Miller P Niebaum S Sandal |
| CCA | P.4, Trending |
| INPO aspect | PI.4 |
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Finding - Farley - IR 05000348/2017001 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2017Q1
Self-Identified List (Farley)
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