05000282/FIN-2010003-03
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Finding | |
|---|---|
| Title | Review of Licensee\'s Evaluation to Determine Whether Performance Deficiency Existed |
| Description | During Unit 2 power ascension activities on May 25, 2010, operations personnel experienced an automatic reactor trip from 33 percent power. The inspectors observed the operators response to the event and reviewed the licensees post-trip report. The inspectors preliminarily determined that the Unit 2 reactor automatic trip was caused by an unexpected turbine trip. The turbine trip was caused by the unexpected shut down of the operating feedwater pump. The licensee conducted troubleshooting activities and determined that the feedwater pump shut down after receiving a low suction pressure signal. The low suction pressure signal was caused by components inside a pressure switch becoming disconnected. The licensee subsequently replaced the pressure switch. The licensee also inspected several other pressure switches to ensure that the internal components would remain connected during plant operation. The cause of the internal components becoming disconnected remained under review at the conclusion of the inspection period. As a result, the inspectors were unable to determine whether a performance deficiency resulted in the unexpected feedwater pump shutdown and the reactor trip. This issue was determined to be unresolved pending the inspectors review of the licensees corrective action evaluation. (Unresolved Item (URI)05000306/2010003-03; Review Licensees Evaluation to Determine Whether Performance Deficiency Existed). |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2010003 Section 4OA3 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | Other: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | R Langstaff R Orlikowski M Phalen K Stoedter D Jones L Haeg R Lerch P Zurawski D Betancourt |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2010Q2
Self-Identified List (Prairie Island)
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