功率变化与反应性不匹配现象研究

Study on Mismatch Phenomenon of Power Change and Reactivity

在压水堆主蒸汽管道断裂(MSLB)事故分析中存在反应堆功率变化与反应性不匹配的现象。利用点堆动力学方程证实传统的"倒时方程"不能有效描述此类现象,并分析反应堆功率变化与反应性不匹配的原因。在考虑动态反应性的周期方程中出现反应性导数项后,能很好地描述功率变化与反应性不匹配物理现象,并揭示其物理内涵。

The mismatch phenomenon of reactor power change and reactivity is found in the analysis of main steam line break （MSLB） accident, the point-reactor kinetics proved that the traditional inhour equation can rnot describe this phenomenon effectively. The origin for the mismatch of reactor power change and reactivity is analyzed. The reactor period equation with dynamic reactivity would include the differential of the reactivity, which can describe such cases well. This equation also showed the physical meaning of such cases.