05000458/FIN-2013003-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Establish Effective Preventive Maintenance for Components Used in High Critical Applications |
| Description | The inspectors reviewed a self-revealing finding for the failure to establish an adequate preventive maintenance strategy for the reactor feedwater regulating valves that resulted in several unplanned power changes due to packing steam leaks. In response, the station polished the pitted and scored valve stems and created a four-year periodic preventive maintenance task to replace the valve stems. The licensee entered this issue into their corrective action program as Condition Report CR-RBS-2013-00076
The performance deficiency is more than minor because it is associated with the equipment performance attribute of the initiating events cornerstone and adversely affected the cornerstone objective of limiting the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure to implement an appropriate preventive maintenance strategy resulted in multiple unplanned reactor power changes. In accordance with NRC Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, and NRC Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process for Findings At Power, Exhibit 1, Section B, this finding screened as very low safety significance (Green) because it was a transient initiator that did not result in both a reactor trip and loss of mitigating equipment. The most significant causal factor of the performance deficiency was over confidence with a lack of a questioning attitude concerning a flawed assumption that the engineering change had significantly increased the valves operating performance margin and solved the past operating issues with feedwater regulating valve packing leakage. No cross-cutting aspect was assigned because the station completed its decision making for the engineering change in June 2007, and these decisions are not indicative of current licensee performance. |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2013003 Section 4OA2 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Elkmann A Barrett J Laughlin G Larkin J Quichocho |
| INPO aspect | |
| ' | |
Finding - River Bend - IR 05000458/2013003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (River Bend) @ 2013Q2
Self-Identified List (River Bend)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||