05000416/FIN-2010005-04
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Reactor Shutdown Procedure Causes Power and Level Oscillations |
| Description | The inspectors identified a noncited violation of 10 CFR 50 Appendix B, Criterion V, for an inadequate shutdown procedure resulting in power and level oscillations in the reactor. The revised procedure failed to require the plant to be placed in startup feedwater level control during low power operations. The performance deficiency was self-revealing; however the inspectors added significant value by identifying inadequate condition report classification, causal evaluation, and corrective actions. As corrective action, the licensee planned to revise the procedure to ensure the plant is placed in startup feedwater control during low power operations. The licensee entered this issue into the corrective action program as Condition Report CR-GGN-2010-05140. The finding is more than minor because it was associated with the initiating events cornerstone attribute of procedure quality and affected the associated cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during power operations. Using the Phase 1 Screening Worksheet in attachment 4 of Inspection Manual 0609, Significance Determination Process, the inspectors determined that the finding had very-low safety significance (Green) because in Table 4a of the Phase 1 Screening Worksheet, the finding was a transient initiator that did not contribute to both the likelihood of a reactor trip and to the likelihood that mitigation equipment or functions would not be available. This finding has a crosscutting aspect in the area of human performance associated with the decision-making component, because station management failed to use conservative assumptions to demonstrate that the change to the shutdown operating procedure was safe prior to proceeding. |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2010005 Section 4OA2 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Elkman G Guerra R Smith D Jones A Barrett T Burns D Overland V Gaddy R Latta J Draper S Hedger B Hagar R Kumana P Prescott D Norwood |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
| ' | |
Finding - Grand Gulf - IR 05000416/2010005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Grand Gulf) @ 2010Q4
Self-Identified List (Grand Gulf)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||