At present, the nuclear power plants built and under construction in China are all coastal nuclear power plants, and the Essential Service Water System (SEC) and Circulating Water System (CRF) are all once-through cooling systems. If these systems are directly applied to the inland sites, the following problems will be leaded: safety functions could hardly be guaranteed, high construction costs, and significant environmental impacts, etc. Based on the circulating cooling technique, this paper proposes improved schemes of SEC and CRF systems by equipping them with safe mechanical ventilation cooling towers, safety water storage pools, and large natural ventilation cooling towers. The improved SEC system ensures the implementation of long-term safety functions and reduces construction costs. The improved CRF system can reduce water intake by 97% and significantly reduce environmental impact. The improved cooling chain systems proposed in this paper provide a reference for the cooling chain system design of inland nuclear power plants.
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