基于TREND程序的石墨通道液态熔盐堆无保护反应性引入事故初步分析

采用自编系统分析程序TREND，基于液态点堆动力学模型，针对10 MW石墨通道液态熔盐堆的设计，研究分析不同反应性在阶跃引入和线性引入情况下10 MW石墨通道液态熔盐堆堆芯功率、石墨温度和堆芯出口熔盐温度的瞬态变化。结果表明，阶跃引入低于570pcm（1pcm=10?5）反应性，堆系统能在无保护的情况下安全运行；当单根控制棒失提引入约800pcm时，反应性引入速率不超过8pcm/s，反应堆能够利用自身的温度、功率负反馈特性有效地控制功率峰值和降低堆芯出口温度，保证反应堆在无保护情况下安全运行。因此，液态熔盐堆具有良好的固有安全性。 

Preliminary Analysis of Unprotected Reactivity Introduction Accident of Liquid Molten Salt Reactor with Graphite Channel based on TREND Program

Using the self-developed system analysis code TREND and based on the liquid point reactor dynamics model, aiming at the design of 10 MW liquid molten salt reactor with graphite channel, the transient changes of core power, graphite temperature and molten salt temperature at the core outlet of 10 MW liquid molten salt reactor with graphite channel with different reactivity under step introduction and linear introduction are studied and analyzed. The results show that the reactor system can operate safely without protection when the reactivity step introduction is lower than 570pcm (1pcm=10?5). When about 800pcm is introduced due to loss of lift of single control rod, the reactivity introduction rate does not exceed 8pcm/s, and the reactor can effectively control the peak power and reduce the core outlet temperature by making use of its own negative feedback characteristics of temperature and power, so as to ensure the safe operation of the reactor without protection. Therefore, liquid molten salt reactor has good inherent safety.