05000387/FIN-2008006-03
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Finding | |
|---|---|
| Title | Failure to Accurately Model the Simulator for RPV Water Level Instrumentation |
| Description | The NRC identified a Non-Cited Violation of 10 CFR 55.46(c)(1), Plant Referenced Simulators, because the Susquehanna simulator did not accurately model reactor pressure vessel (RPV) level instrumentation following a design basis accident loss of coolant accident (DBA LOCA). Specifically, an analysis performed in 1994 to determine if the observed simulator response during a large break LOCA was consistent with the expected plant response, was based on an overly conservative assumption that the drywell would experience superheated conditions, which would cause RPV water level instrumentation reference leg flashing and a subsequent loss of all RPV level indication. The expected plant response, as stated in the analysis, was incorrect; in that a LOCA would not always cause a loss of all RPV level instruments. As a result, the simulator modeling was incorrect. The performance deficiency is more than minor because it is associated with the Human Performance attribute of Mitigating Systems and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the modeling of the Susquehanna simulator introduced negative operator training that could affect the ability of the operators (a mitigating system) to take the appropriate actions during an actual event. The finding was determined to be of very low safety significance because it is not related to operator performance during requalification, it is related to simulator fidelity, and it could have a negative impact on operator actions. (Section 4OA2.a.3 (c) |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2008006 Section 4OA2 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | F Arner G Ottenberg R Mckinley J Bream R Fuhrmeister M Gray |
| INPO aspect | |
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Finding - Susquehanna - IR 05000387/2008006 | ||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2008Q1
Self-Identified List (Susquehanna)
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