05000331/FIN-2009009-01
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Finding | |
|---|---|
| Title | Failure to Promptly Identify and Correct a Significant Condition Adverse to Quality Associated with B EDG |
| Description | The inspectors identified a finding and associated apparent violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, associated with the licensees failure to identify and correct the cause of B EDG overspeed trip alarms, a condition documented in the licensees corrective action program as being adverse to quality (CAP 055746), in February 2008. Following corrective actions in March 2008, to replace a faulty annunciator card, the spurious overspeed trip alarms began recurring in June 2008. By not performing additional evaluation to identify and correct the cause for the recurring spurious overspeed trip alarms, the conditions which allowed the overspeed switch degradation continued, which eventually resulted in the failure of the B EDG during the monthly surveillance test conducted in November 2008. The licensee implemented corrective actions that included replacing the B EDG overspeed microswitch, developing written instructions for installation and setup of the microswitch, inspecting the A EDG overspeed switch for extent of condition, stopping the practice of resetting the EDG overspeed latch once per shift, repair of the overspeed electrical conduit support bracket, and revisions to the stations administrative control procedure for troubleshooting to require more rigorous troubleshooting activities for Priority 2 items. The finding was determined to be more than minor because the reliability of the B EDG is associated with the equipment performance attribute of the Mitigating Systems Cornerstone and adversely affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding associated with this apparent violation was assessed using a Phase 3 analysis in accordance with NRC Inspection Manual Chapter 0609 Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations, and is preliminarily determined to have low to moderate safety significance (White). The cause of this apparent violation was related to the Corrective Action Program Component for the cross-cutting area of Problem Identification and Resolution, because the licensee failed to thoroughly evaluate problems such that the resolutions address causes and extent of conditions P.1(c). Specifically, the licensee failed to thoroughly evaluate and identify the cause of recurring B EDG overspeed trip alarms. The recurring alarms started in February 2008, and periodically continued until the B EDG output breaker tripped during a surveillance test on November 2, 2008 |
| Site: | Duane Arnold  |
|---|---|
| Report | IR 05000331/2009009 Section 4OA2 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | Violation: White |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | C Pederson K Riemer M Satorius P Lougheedd Passehlk Riemer N Shah R Baker R Orlikowski |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Duane Arnold - IR 05000331/2009009 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Duane Arnold) @ 2009Q2
Self-Identified List (Duane Arnold)
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