【摘要】 DHR-200低温供热堆在事故工况下具有良好的安全特性。通过RELAP5程序模拟分析了失控提棒ATWS事故工况，其计算结果表明该堆具备显著的负温度反应性自调节能力。事故过程中，仅依靠燃料和冷却剂温升带来的负反应性反馈即可实现自动停堆，无需依赖主动安全系统或人工干预。同时，系统通过非能动方式开启的自然循环瓣阀，事故后形成了有效的冷却剂自然循环通道，将堆芯余热安全导出至堆水池。这些特性充分证明了DHR-200堆型具有可靠的固有安全性。更多还原

【Abstract】 The DHR-200 low-temperature heating reactor has excellent safety characteristics under accident conditions. Through simulation analysis using the RELAP5 program, the ATWS accident condition was analyzed. The calculation results show that this reactor has a significant negative temperature reactivity self-regulation capability. During the accident, the automatic shutdown can be achieved solely by the negative reactivity feedback brought by the temperature rise of the fuel and coolant, without relying on active safety systems or manual intervention. At the same time, the natural circulation valve opened by the system through passive means forms an effective coolant natural circulation channel after the accident, safely discharging the residual heat of the reactor core to the reactor water pool. These characteristics fully prove that the DHR-200 reactor type has reliable inherent safety.更多还原