05000461/FIN-2010006-01
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Non-Conservative Acceptance Criteria for RHR Pump Performance Testing |
| Description | The inspectors identified an NCV of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, having very low safety significance for the licensees failure to ensure adequate acceptance limits were incorporated into test procedures. Specifically, the licensee failed to properly consider instrument loop uncertainties and allowable emergency diesel generator frequency variance when determining the alert and required action values used in the inservice test procedure for testing of the residual heat removal pumps. Consequently, the acceptance criteria for the lower limits on degradation of pump head were non-conservative. This finding was entered into the licensees corrective action program and a preliminary calculation performed by the licensee concluded that the pumps were operable.
The finding was more than minor because it was associated with the Mitigating Systems cornerstone attribute of equipment performance and affected the cornerstone objective of ensuring the capability of the system to respond to initiating events to prevent undesirable consequences. This finding was of very low safety significance (Green) because the licensee was able to demonstrate pump operability and therefore, there was no loss of safety function. This finding had a cross-cutting aspect in the area of problem identification and resolution because the licensee did not thoroughly evaluate operating experience that included similar issues relating to the failure to appropriately account for instrument uncertainties in design analysis. |
| Site: | Clinton  |
|---|---|
| Report | IR 05000461/2010006 Section 1R21 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dunlop C Baron N Greca J Gilliam A Stone C Edwards T Hartman |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
| ' | |
Finding - Clinton - IR 05000461/2010006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Clinton) @ 2010Q2
Self-Identified List (Clinton)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||