颗粒型弥散可燃毒物反应性控制分析

本文从可燃毒物特性出发,分析了不同类型均匀毒物对栅元kinf的影响,同时分析了不同类型可燃毒物以不同半径颗粒形式存在时对栅元kinf的影响,指出对于吸收截面较大消耗速率较快的可燃毒物,可以根据反应性控制需要以一定半径的颗粒形式均匀弥散在燃料中,既能保证在寿期初不会对反应性造成过分压制,又能在寿期中使毒物缓慢消耗,使反应性得到逐渐释放,最后在寿期末由于其较大的吸收截面而消耗充分,反应性惩罚较小。本文为可燃毒物在反应性控制中的应用提供了另一条思路,具有一定的借鉴意义。

Based on the characteristics of burnable poisons, in this paper the inf luence of different types of burnablepoisons on the k-inf inite of fuel cell was analysed, so was the inf luence of different types of particle-type dispersionburnable poisons with dif ferent particle radius. It’s pointed out that for the burnable poisons which have largeabsorption cross section and fast consumption rate, it can be dispersed into the fuel cell in the form of particles of acertain radius according to the need of reactivity control. At the beginning of core life, the reactivity will not be oversuppressed, and at the middle of core life, the burnable poison is consumed slowly and so the reactivity is releasedgradually. Finally at the end of core life, due to its large absorption cross section, the consumption is suff icient and thereactivity punishment is relatively small. This paper provides another way of thinking for the application of burnablepoisons in reactivity control.