05000306/FIN-2011003-03
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Finding | |
|---|---|
| Title | Unit 2 Reactor Trip during Severe Weather |
| Description | An unresolved item (URI) was identified due to the licensees root cause investigation remaining in progress at the conclusion of the inspection period. On May 9, 2011, the area surrounding Prairie Island was experiencing an extended severe thunderstorm with significant lightning. Following a large lightning strike, Unit 2 automatically shut down from 100 percent power due to a trip of the main turbine. The inspectors were in the control room when the reactor trip occurred. The inspectors observed the response of the operating crew to ensure that the crew was adhering to plant procedures. The inspectors also observed equipment parameters available in the control room to ensure that the reactor and the associated equipment responded as expected following the reactor trip. There were no findings in these areas. The inspectors reviewed documentation regarding the status of the electrical grid and substation maintenance work history to determine the direct cause of the trip. The licensee preliminarily determined that the reactor trip was caused by a deficiency in electrical substation maintenance activities performed by Xcel Energy employees not associated with Prairie Island. This deficiency was corrected prior to Unit 2 startup activities. However, the licensees root cause investigation was ongoing at the conclusion of the inspection. As a result, the inspectors determined that this issue should be considered an URI pending the review of the licensees root cause investigation report and the proposed corrective actions |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000306/2011003 Section 4OA3 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | J Jandovitz M Mitchell C Brown M Phalen K Stoedter D Betancourt J Corujo-Sandin E Sanchez N Feliz-Adorno S Lynch S Shahc Zoiad Betancourt J Beavers J Giessner K Stoedter M Phalen N Feliz Adorno P Cardona Morales P Elkmann P Zurawski S Shah V Meghani |
| INPO aspect | |
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Finding - Prairie Island - IR 05000306/2011003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2011Q2
Self-Identified List (Prairie Island)
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