中国实验快堆中的^(238)U裂变反应率测量实验研究

Measurement Experimental Research of ^(238)U Fission Reaction Rate In China Experimental Fast Reactor

由于238 U裂变反应率在中国实验快堆(CEFR)中是一非常关键的指标参数,因此,在CEFR的首次物理启动工作中对其进行了实验测量。在实验过程中,利用高贫化的UO2(235 U-0.002%)直接进行了238 U裂变反应率的绝对测量;利用国产贫铀片(235 U-0.335%)、高浓铀片(235 U-90%)组合方式间接进行了238 U裂变反应率的测量。给出两种方法与理论值的对比和轴向及径向的相对分布。本实验为238 U裂变反应率测量提出一新的选择方案,并验证了其可靠性。

China Experimental Fast Reactor（CEFR） is the first fast reactor in China.It experimented on CEFR to measure the 238U fission reaction rate in the first physics startup tests because of its fundamentality.The experiment was composed of the absolute measurement by the high poor uranium（235U-0.002%） and the indirect measurement by the national poor uranium（235U-0.335%） and the high enrichment uranium（235U-90%）.The axial distribution and the radial distribution were given and compared with the theoretical value.The reliability was proved and a new way was found to measure the 238U fission reaction rate.