05000387/FIN-2010004-03
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Finding | |
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| Title | Failure to Accurately Model the Simulator for RCIC System Operation at Reduced Flow Rates in Automatic |
| Description | An NRC-identified, Green NCVof 10 CFR 55.46(c)(1), Plant Referenced Simulators, was identified because the Susquehanna simulator did not accurately model RCIC system response when operated in automatic flow control at less than design basis full flow. While the licensee has not yet completed simulator modifications to routinely model RCIC control system instabilities when operating the system -in automatic flow control at less than design basis full flow, the simulator does model instabilities resulting from a control system malfunction. The inspectors verified that licensed operators have trained on and responded to RCIC control system malfunctions during examinations. This issue was entered in PPL\'s corrective action process as CRs 1285503, 1287462, and 1286803. 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 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. This issue was determined to not have a cross-cutting aspect. This was based on the age of the EPRI guidance (issued in 2002) applicable to the RCIC system flow instabilities and the lack of opportunities over the past three years to revisit this guidance. Therefore, this issue was not reflective of current performance. |
| Site: | Susquehanna  |
|---|---|
| Report | IR 05000387/2010004 Section 1R15 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | A Rosebrook D Molteni J Furia J Greives P Finney P Krohn R Mckinley |
| INPO aspect | |
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Finding - Susquehanna - IR 05000387/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Susquehanna) @ 2010Q3
Self-Identified List (Susquehanna)
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