05000373/FIN-2014003-03
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Finding | |
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| Title | |
| Description | On May 29, the licensee was performing a routine surveillance, LOS-RP-Q2, Unit 1 Turbine Stop Valve Scram Functional Test. This test is performed quarterly and was the first test of these valves following the Unit 1 refueling outage. One portion of the test verified that the equipment used to detect stop valve closure was working and that once detected, appropriate system responses occur. Following test initiation, the expected system response was not obtained and the surveillance test failed. Troubleshooting led the licensee to conclude that the RPS limit switch was the component most likely to generate the specific failure mode. Field checks identified that the limit switch actuation arm appeared to be making physical contact with (rubbing) some of the switch mounting hardware. This issue was corrected by making a small change in the physical configuration of the switch; specifically, the actuating arm was shifted farther down the shaft of the limit switch. This adjustment created additional clearance, allowing the switch to operate normally. Subsequent to this repair, the test was re-performed and the expected system response was obtained. At the time of the writing of this report, the licensee was still examining the factors associated with this event and had initiated an ACE to document its conclusions. This issue is an Unresolved Item (URI) pending NRC evaluation of the additional information being developed by the licensee (URI 05000373/2014003-03, Unit 1 Reactor Protection System Limit Switch Testing Failure). |
| Site: | LaSalle  |
|---|---|
| Report | IR 05000373/2014003 Section 1R19 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | M Kunowski R Baker R Ruiz R Zuffa D Chyu G Roach I Hafeez J Beavers J Robbins M Holmbergd Mcneilj Jandovitz J Laughlin J Neurauter J Robbins M Kunowski R Baker R Elliott R Ruiz R Winter R Zuffa |
| INPO aspect | |
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Finding - LaSalle - IR 05000373/2014003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2014Q2
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