| Popis: |
This paper explains the overall control strategy of nuclear island ventilation system in CPR1000 NPP (Nuclear Power Plant), and expounds the current situation of nuclear island ventilation system. It analyzes the problems to be solved and challenges to be faced. Based on the market products, this paper puts forward the new control strategy and idea. It is necessary to develop nuclear safety-class electrical heater power regulation control cabinet used for local temperature regulation control, and local control cabinet based on simple hardware or an integrated safety-class electrical heater with self-control. The safety-class local power regulation control cabinet and on-off local control cabinet were developed successfully in this study, but there are not products on the safety-class integrated electrical heater with self-control in market, which shall be developed in the future. Then, propose a control logic architecture, and introduce the control logic design idea how to implement from the equipment level to the plant level. At present, in new construction NPPs, nuclear island ventilation systems have basically realized the “system level” control level and completely realized the “sub-function level” control according to this study. Subsequently, the “system-level” and “plant-level” relationship can be sorted out to further realize “plant-level” control. More intelligent ventilation and air conditioning algorithms may be also introduced to improve the overall control level of nuclear island ventilation system in NPP. |
