Abstract Molten salt reactor (MSR) has good economic potential, inherent safety and nonproliferation characteristics. In this paper, the 450 MWth graphite molten salt reactor is taken as the research object. First, the neutronic design of a 450 MWth graphite molten salt reactor is introduced in terms of the core material, conceptual design, static physical characteristics and core design parameters. Then, the model of the MSR core is established by combining the neutron dynamics model, the thermal model and the auxiliary calculation. Finally, the transient characteristics of the 450 MWth MSR core under the conditions of step reactivity insertion and main pump coast-down are simulated and analyzed. The results show that under the aforementioned conditions, the core power can be stable in the controllable level range, and the core temperature is in a safe range.

中文翻译：

---

450 MWth石墨熔盐堆堆芯的中子设计与动力学分析

摘要 熔盐反应堆（MSR）具有良好的经济潜力、固有的安全性和防扩散特性。本文以450 MWth石墨熔盐反应堆为研究对象。首先，从堆芯材料、概念设计、静态物理特性和堆芯设计参数等方面介绍了450 MWth石墨熔盐堆的中子设计。然后，结合中子动力学模型、热模型和辅助计算，建立了MSR堆芯模型。最后，对450 MWth MSR堆芯在阶跃反应插入和主泵滑行条件下的瞬态特性进行了仿真分析。结果表明，在上述条件下，核心功率可以稳定在可控水平范围内，