05000440/FIN-2010007-01
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Finding | |
|---|---|
| Title | Unexpected Recirculation Flow Control Valve Runback Due to Inadequate Work Plan |
| Description | The inspectors determined that the work plan developed for replacement of the 15-Vdc regulating cards did not adequately address the proper controls to execute the task and was a performance deficiency. The inspectors further determined that the issue was within the licensees ability to foresee and correct, and that it could have been prevented because the licensee had previous similar internal operating experience. The finding was determined to be more than minor because the finding was similar to Example 4.b in IMC 0612, Appendix E, Examples of Minor Issues, dated January 10, 2008, and resulted in a reactor power transient requiring operator intervention to maintain the reactor power at a stable value. This performance deficiency impacted the Initiating Events Cornerstone attribute of procedure quality and adversely affected the cornerstone objective to limit the likelihood of those events that upset plant stability. Specifically, the failure to use proper controls resulted in a runback signal from the automatic flow demand limiter system and required operator actions to control reactor power. The inspectors determined the finding could be evaluated using the SDP in accordance with Inspection Manual Chapter (IMC) 0609, Significance Determination Process, Attachment 0609.04, Phase 1 - Initial Screening and Characterization of Findings, Table 4a, dated January 10, 2008, for the Initiating Events Cornerstone. Because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment would not be available, the inspectors determined the finding to be of very low safety significance (Green). This finding is associated with a cross-cutting aspect in the operating experience component of the Problem Identification & Resolution cross-cutting area, because the licensee did not implement internal operating experience (OE) into station processes and procedures. Specifically, licensee personnel did not adequately research and identify previous plant experience regarding the impact of de-energizing the power supply to the control circuitry for APRM \'A\' on other related systems contributing directly to an unplanned power transient on the reactor. |
| Site: | Perry  |
|---|---|
| Report | IR 05000440/2010007 Section 4OA2 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Dunlop J Jandovitz C Brown M Phalen J Cameron T Hartman |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Perry - IR 05000440/2010007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2010Q4
Self-Identified List (Perry)
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