05000261/FIN-2012003-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Lack of Preventive Maintenance on Feedwater Control Switch Results in an Automatic Reactor Trip |
| Description | A self-revealing Green finding was identified when the licensee failed to establish adequate preventative maintenance for equipment associated with the feedwater control systems. Specifically, the licensees inappropriate classification of the feedwater flow loop selector switch as a run-to-failure component permitted the switch to remain in service, without preventative maintenance, until its failure on March 28, 2012, which resulted in a feedwater transient and reactor trip. Corrective actions included the replacement of the failed switch and future replacement of seven additional switches that were deemed to be at risk for a similar failure. This issue has been entered into the corrective action program (CAP) as Nuclear Condition Report (NCR) #527203. The licensees inappropriate classification of plant equipment in accordance with ADMNGGC- 0107 Rev. 1, Equipment Reliability Process Guideline, which permitted feed flow selector switch 1/FM-488B to remain in service, without preventative maintenance, until failure was a performance deficiency. This finding was determined not to be a violation of NRC requirements. The finding was more than minor because it was associated with the initiating events cornerstone attribute of Equipment Performance, and it affected the associated 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. Specifically, the performance deficiency caused an automatic reactor trip from 55 percent power operations on March 28, 2012. The finding was determined to be of very low safety significance (Green) because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment or functions would not be available. The performance deficiency had a cross-cutting aspect of Evaluation of Identified Problems in the area of Problem Identification and Resolution, because the licensee failed to thoroughly evaluate the events in 2010 and 2008 such that the resolutions addressed the causes and extent of conditions as necessary. |
| Site: | Robinson  |
|---|---|
| Report | IR 05000261/2012003 Section 1R12 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | A Sengupta C Scott D Lanyi G Laska J Hickey M Speck R Musser W Loo |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
| ' | |
Finding - Robinson - IR 05000261/2012003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Robinson) @ 2012Q2
Self-Identified List (Robinson)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||