05000219/FIN-2009003-02
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Finding | |
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| Title | Inadequate evaluation Results in Instrument Air Transient |
| Description | A self-revealing finding occurred when Exelon did not adequately evaluate the impact of water which had entered the service air system in December 2008, and resulted in an accumulation of failed desiccant and corrosion products in the C&D instrument air dryer purge valve. This caused the purge valve to seize in the open position and an instrument air transient on April 5. This finding was determined not to be a violation of NRC requirements. Exelons corrective actions included replacing the desiccant, repairing the air dryer purge valve and installing it in its proper orientation. This issue has been entered into Exelons corrective action program. The finding was more than minor in accordance with IMC 0612, Appendix B (Section1-3), Issue Screening, because it was associated with the configuration control attribute of the initiating events cornerstone and affected the objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during power operation. In accordance with IMC 0609.04 (Table 4a), Phase 1 Initial Screen and Characterization of Findings, the inspectors conducted a Phase 1 SDP screening and determined that a detailed Phase 2 evaluation was required to assess the safety significance because the finding contributed to both the likelihood of a reactor trip and the likelihood that mitigation equipment would not be available. The inspectors determined that the finding was of very low safety significance (Green) using Table 2,Initiators and Dependency Table for Oyster Creek Nuclear Generating Station, and Table 3.4, SDP Worksheet for Oyster Creek Nuclear Generating Station Loss of Instrument Air (LOIA), in the Risk-Informed Inspection Notebook for Oyster Creek Nuclear Generating Station. The performance deficiency had a cross-cutting aspect in the area of problem identification and resolution, corrective action program (IMC 0305,Aspect P.1(c)), because Exelon did not fully evaluate the effect of the failure of the #3 air compressor after-cooler to include the potential of water intrusion into the service air system |
| Site: | Oyster Creek |
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| Report | IR 05000219/2009003 Section 1R12 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | S Pindale J Kulp M Ferdas T Fish R Nimitz S Chaudhary R Bellamy H Gray |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Oyster Creek - IR 05000219/2009003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2009Q2
Self-Identified List (Oyster Creek)
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