05000397/FIN-2009002-02
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Finding | |
|---|---|
| Title | Failure to Perform an Adequate Site Acceptance Test |
| Description | The inspectors reviewed a self-revealing finding for the failure of Energy Northwest to perform an adequate site acceptance test of the digital electro-hydraulic system. Specifically, Energy Northwest failed to verify that the quad voter solenoid valves in the digital electro-hydraulic system could be replaced with the main turbine on-line. Consequently, when an on-line valve replacement was performed, the system experienced a pressure transient which resulted in a fast closure of the main turbine governor valves and a subsequent reactor scram. Energy Northwest entered the issue into the corrective action program and conducted a root cause evaluation. This finding is greater than minor because it was a human performance error that affected the initiating events cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. The finding was of very low risk significance because the finding did not result in the loss of a safety function of a single train for greater than its technical specification allowed outage time. This finding was determined to have the crosscutting aspect of human performance with a decision making component, because Energy Northwest failed to perform an adequate effectiveness review to identify the possible unintended consequences of on-line replacement of quad voter solenoid valves in the digital electro-hydraulic system H.1.b] |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2009002 Section 4OA3 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | C Graves R Cohen W Walker N Hernandez |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Columbia - IR 05000397/2009002 | |||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2009Q1
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