Nodal dynamic models allow rapid reduced-order simulations of complex systems. This paper presents a publicly available system dynamic model of a molten salt reactor system with a topology of the Molten Salt Reactor Experiment (MSRE), in MATLAB/Simulink, building upon a model previously published and validated with MSRE data. It adds scaling of nominal power, dynamic representation of decay heat generation, a generic decay heat removal system, improved documentation, modularity, and test cases. One hour of system transient runs in less than 10 min on a laptop. This model is intended for first order engineering calculations, developing insights into system transient behavior, equipment sizing, parameter sensitivity studies. The model contains an easy to use toolkit which can be customized and expanded to describe any molten salt reactor system. Scenarios involving off-normal transients are presented. Relation between shutdown reactivity insertions, decay heat removal, core recriticality, and safe shutdown conditions are discussed.

节点动力学模型可以对复杂系统进行快速降阶仿真。本文在以前发布并经MSRE数据验证的模型的基础上，在MATLAB / Simulink中提出了具有熔融盐反应堆实验（MSRE）拓扑的熔融盐反应堆系统的公共可用系统动力学模型。它增加了标称功率的缩放比例，衰减热产生的动态表示，通用的衰减热消除系统，改进的文档，模块化和测试用例。一小时的系统瞬态在笔记本电脑上运行的时间不到10分钟。该模型用于一阶工程计算，深入了解系统瞬态行为，设备选型，参数敏感性研究。该模型包含一个易于使用的工具包，可以对其进行定制和扩展以描述任何熔融盐反应堆系统。提出了涉及非正常瞬态的场景。讨论了关闭反应性插入，衰减热量去除，堆芯临界性和安全关闭条件之间的关系。