05000220/FIN-2008003-02
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Finding | |
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| Title | |
| Description | A self-revealing finding was identified on April 18, 2008, when NMPNS failed to take appropriate corrective actions to address corrosion products in the instrument air (IA) system in a timely manner, which led to an accumulation of water in the Unit 2 IA system. As a result, water intrusion into the air operator for the \'B\' reactor feedwater pump recirculation valve caused the valve to open during plant power ascension, causing a reduction in feedwater flow to the reactor and thereby challenging plant stability. As immediate corrective action, operators secured power ascension and isolated the recirculation valve. The finding was greater than minor because it was associated with the equipment performance attribute of the Initiating Events cornerstone and adversely affected the 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 evaluated in accordance with IMC 0609, Attachment 4, and determined to be of very low safety significance per the SDP Phase one determination because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available, and it did not screen as potentially risk significant due to external events. The finding had a cross-cutting aspect in the area of problem identification and resolution because NMPNS did not take appropriate corrective actions to address corrosion products in the IA system in a timely manner (P.1.d per IMC 0305). (Section 1R20 |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2008003 Section 1R20 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | D Dempsey J Furia A Rosebrook E Knutson R Cureton B Bickett |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Nine Mile Point - IR 05000220/2008003 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2008Q2
Self-Identified List (Nine Mile Point)
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