本发明公开了一种氦氙冷却微型反应堆安全系统及控制方法，属于核能技术领域。氦氙冷却微型反应堆安全系统包括反应性控制系统和余热排出系统，反应性控制系统包括流量调节阀及控制鼓，余热排出系统包括非能动余热排出系统及热电转换系统。根据堆芯所处的不同工况，如正常工况或事故工况，反应性控制系统能够控制流量调节阀及控制鼓产生相对应的动作，使反应堆的堆内温度与压力维持正常；当堆芯停堆时，余热排出系统根据堆芯不同的停堆原因可通过不同的系统载出堆芯内的衰变热，防止堆芯内温度过高。由此，氦氙冷却微型反应堆的安全壳不会因高温导致破损进而造成放射性物质外泄，保障运行安全。

This invention discloses a safety system and a control method for a helium-xenon cooled micro reactor, belonging to the technical field of nuclear energy. The safety system of helium-xenon cooled micro reactor includes reactivity control system and residual heat removal system, the reactivity control system includes flow regulating valve and control drum, and the residual heat removal system includes passive residual heat removal system and thermoelectric conversion system. According to the different working conditions of the reactor core, such as normal working conditions or accident working conditions, the reactivity control system can control the flow control valve and the control drum to produce corresponding action, so that the temperature and pressure in the reactor can maintain normal. When the core is shut down, the residual heat removal system can carry the decay heat in the core through different systems according to the different reasons of the core shutdown, so as to prevent the temperature in the core from being too high. As a result, the containment of the helium-xenon-cooled micro reactor will not be damaged due to high temperature, resulting in the leakage of radioactive materials, ensuring the safety of operation.