05000220/FIN-2011002-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Identification And Corrective Actions For Emergency Diesel Generator Temperature Control Valve Degradation |
| Description | A self-revealing finding of very low safety significance associated with a non-cited violation (NCV) of 10 CFR Part 50, Criterion XVl, Corrective Action, was identified following a monthly surveillance test (ST) on January 18,2011, when Unit 2 operators removed the Division I emergency diesel generator (EDG) from the grid due to rising jacket water cooling temperature. The condition resulted in an unplanned entry into a technical specification limiting condition for operation (LCO) and 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> of system unavailability. The inspectors determined that ineffective performance monitoring of the Division I EDG jacket water cooling system since April 2008 was a performance deficiency in that the degraded condition of the thermostatic control valve was reasonably within NMPNS\' ability to foresee and correct. NMPNS entered this issue into its corrective action program (CAP), repaired the valve and enhanced the valve maintenance procedure to ensure smooth operation. The finding was more than minor because it was associated with the reliability attribute of the mitigating systems cornerstone and affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was of very low safety significance because it was not a design or qualification deficiency, did not represent a loss of system/train safety function, and did not screen as potentially risk significant due to external events. The finding had a cross-cutting aspect in the area of problem identification and resolution, corrective action program, because NMPNS did not take appropriate correction actions to address an adverse trend in a timely manner, commensurate with its safety significance and complexity. |
| Site: | Nine Mile Point  |
|---|---|
| Report | IR 05000220/2011002 Section 1R22 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | D Dempsey K Kolaczyk J Furia G Dentel D Dodson |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
| ' | |
Finding - Nine Mile Point - IR 05000220/2011002 | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Nine Mile Point) @ 2011Q1
| |||||||||||||||||||||||||||||||||