All natural circulation-type modular small reactor

Abstract

The invention discloses an all natural circulation-type modular small reactor. The all natural circulation-type modular small reactor comprises a reactor main body, a safe shell, a water tank and a passive safety system. The reactor main body comprises a pressure vessel. A reactor core, a direct current steam generator and a voltage stabilizer are orderly arranged in the pressure vessel from bottom to top. One end of a control rod driving mechanism matched with the reactor core is arranged at a top cover of the pressure vessel. The pressure vessel is arranged in the safe shell. The safe shellis immersed in the water tank. The passive safety system comprises a passive residual heat removal system and a passive safe shell heat transmission system. The reactor is free of forced circulation of a path of a cooling agent driven by a main pump, and utilizes density contrast of cooling agents between the direct current steam generator and the reactor core and cold and hot core potential difference to drive the cooling agents to all naturally circulate in the pressure vessel so that the reactor safety is improved. The passive safety system realizes a lasting submerged state of the reactorcore and carries out the residual heat of the reactor core to prevent core damage.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a modular small reactor with full natural circulation. Background technique [0002] Compared with the existing large-scale commercial pressurized water nuclear power plants, the modular small reactor adopts an integrated design, which integrates the pressure vessel, steam generator and pressurizer, removes the large primary circuit pipes and related valves, and eliminates water loss from large breaches Accidents occur, reducing the possibility of small and medium loss of water accidents; and because of its relatively large coolant load and strong natural circulation capacity, the safety of the reactor is greatly improved. [0003] The research and design of modular small reactors are not only used for ship power, but also mainly used for floating nuclear power plants, seawater desalination, district heating, hydrogen production industry and so on. [0004] In short, mo...

AI Technical Summary

Problems solved by technology

The inherent safety of the above reactor types is insufficient, and the design of the safety system is complex, such as using the core water injection system to maintain the reactor coolant load, using the core cooling system to discharge the residual heat of the core, and using the automatic pressure relief system to prevent high-pressure molten material from spraying. The reactor cavity water injection system realizes the retention of the core melt in the pressure vessel, and the containment cooling system is used to finally take out the core heat, etc.

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