We had first developed APR1400 simulator with the form of emulation to perform HFE V&Vof the MMIS in the construction phase of Saewool 1&2 nuclear power plant. And then APR1400simulator was developed gradually reflecting design change and transformed into the APR1400training simulator, and finally contributed to the acquisition of the operating license. But if MMISrelated problem or MMIS design change happens in the digitalized MMIS in the plant operationphase, we need to perform MMIS V&V including control logic and MMI function through themost similar testbed. But plant MMIS cannot be fully tested with the limited condition of theemulated simulator. We have come up with new method to perform operator training and MMISV&V simultaneously. Accordingly, we adopted virtual Distributed Control System (DCS) toimplement plant MMIS in the APR1400 training simulator. This virtual DCS has the same controllogic and MMI function as plant is provided. Three types for simulator operation will be provided.First mode is hybrid mode which is implemented with the form of emulated MMI and real plantcontrol logic implemented with virtual DCS for operators’ training as well as control logic V&V.Second mode is emulation mode which is implemented with the form of emulated MMI andcontrol logic. Final mode is stimulation mode which is fully implemented with the form of realplant MMIS including control logic and MMI function. This approach provides opportunity thatcomplex control logic such as NSSS Process Control System can be validated before real controllogics are applied in plant MMIS and improves coping capability of operator due to operator’straining in the same environment as plant. Application of this method can reduce plant transientstate and unexpected plant event through the resolution of MMIS fault in advance.
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