05000458/FIN-2011008-09
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Finding | |
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Title | Inadequate Simulator Fidelity for Emergency Diesel Generator Loading |
Description | The team identified a Green, noncited violation of 10 CFR 55.46(c)(1), Simulation Facilities, which states, in part, that a plant-referenced simulator used for the administration of the operating test must demonstrate expected plant response to operator input and to normal, transient, and accident conditions to which the simulator has been designed to respond. Specifically, prior to October 27, 2011, the River Bend Station simulator did not demonstrate the expected plant response for standby diesel generator loading during accident conditions to which the simulator was designed to respond. The electrical loading on the emergency diesel generator in the simulator was approximately 800 kW less than the expected full load for the diesel generator. This finding was entered into the licensee\'s corrective action program as Condition Report CR-RBS-2011-07682. The team determined that the failure of the plant-referenced simulator to demonstrate expected plant response for standby diesel generator loading during accident conditions to which the simulator has been designed to respond was a performance deficiency. The finding was more than minor because it is associated with the human performance attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring availability, reliability, and capability of systems needed to respond to initiating events to prevent undesired consequences. Specifically, the incorrect simulator response adversely affected the control room operator crew\'s capability to assess standby diesel generator loading conditions. In accordance with NRC Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheets and the associated Appendix I, the finding was determined to be of very low safety significance (Green). Specifically, Manual Chapter 0609, Appendix I, Operator Requalification Human Performance Significance Determination Process, block 12, establishes a Green finding for failure to correctly replicate the plant\'s response on the simulator that either has the potential to cause or actually causes negative training to operators. Negative training did occur for this finding because operators thought they had electrical load margin on the emergency diesel generators when the diesels were actually fUlly loaded with minimal margin without securing other equipment. This finding had a crosscutting aspect in the area of human performance, resources component, in that the licensee did not ensure that equipment (plant-referenced simulator) was adequate to assure nuclear safety for the correct training of licensed operator personnel |
Site: | River Bend |
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Report | IR 05000458/2011008 Section 1R21 |
Date counted | Dec 31, 2011 (2011Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | K Clayton G George T Farnholtz S Makor N Greca C Edwards J Braisted B Latta |
CCA | H.9, Training |
INPO aspect | CL.4 |
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Finding - River Bend - IR 05000458/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2011Q4
Self-Identified List (River Bend)
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