05000282/FIN-2010003-01
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Finding | |
|---|---|
| Title | Failure to Address Design Vulnerability Results in Reactor Trip |
| Description | A self-revealed finding of very low safety significance was identified following an automatic reactor trip on April 16, 2010. Specifically, the licensee failed to appropriately establish and implement actions to correct the causes of a turbine trip/reactor trip in 2001 and a turbine trip in 2003 even though the actions were required by the corrective action procedure in use at the time of the event. The failure to appropriately establish and implement actions to correct the causes of the previous events resulted in creating a large difference in Unit 2 condenser pressures while operating at lower power levels and a subsequent turbine trip/reactor trip. Corrective actions for this issue included correcting system deficiencies which led to the large difference in condenser pressures and improving procedural guidance regarding the sealing steam system. The inspectors determined that this issue was more than minor because it was associated with the design control, configuration control and procedure quality attributes of the Initiating Events Cornerstone and impacted the cornerstone objective of limiting the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. This finding was determined to be of very low safety significance because it did not contribute to a reactor trip with mitigating equipment not available. No cross-cutting aspect was assigned to this finding because the decisions made in regard to the 2001 and 2003 actions were made more than 2 years ago. No violation of NRC requirements was identified because the system deficiencies that contributed to the turbine trip/reactor trip were associated with non safety-related systems. (Section 4OA3.7) |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2010003 Section 4OA3 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| 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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