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        Conceptual design of a dual drum-controlled space molten salt reactor (D<sup>2</sup> -SMSR): Neutron physics and thermal hydraulics

        Yongnian Song,Nailiang Zhuang,Hangbin Zhao,Chen Ji,Haoyue Deng,Xiaobin Tang Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6

        Space nuclear reactors are becoming popular in deep space exploration owing to their advantages of high-power density and stability. Following the fourth-generation nuclear reactor technology, a conceptual design of the dual drum-controlled space molten salt reactor (D<sup>2</sup>-SMSR) is proposed. The reactor concept uses molten salt as fuel and heat pipes for cooling. A new reactivity control strategy that combines control drums and safety drums was adopted. Critical physical characteristics such as neutron energy spectrum, neutron flux distribution, power distribution and burnup depth were calculated. Flow and heat transfer characteristics such as natural convection, velocity and temperature distribution of the D<sup>2</sup>-SMSR under low gravity conditions were analyzed. The reactivity control effect of the dual-drums strategy was evaluated. Results showed that the D<sup>2</sup>-SMSR with a fast spectrum could operate for 10 years at the full power of 40 kWth. The D<sup>2</sup>-SMSR has a high heat transfer coefficient between molten salt and heat pipe, which means that the core has a good heat-exchange performance. The new reactivity control strategy can achieve shutdown with one safety drum or three control drums, ensuring high-security standards. The present study can provide a theoretical reference for the design of space nuclear reactors.

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