中国实验快堆中的<sup>238</sup>U裂变反应率测量实验研究

中国实验快堆中的²³⁸U裂变反应率测量实验研究

摘要: 由于²³⁸U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（²³⁵U-0.002%）直接进行了²³⁸U裂变反应率的绝对测量；利用国产贫铀片（²³⁵U-0.335%）、高浓铀片（²³⁵U-90%）组合方式间接进行了²³⁸U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²³⁸U裂变反应率测量提出一新的选择方案，并验证了其可靠性。

Abstract: 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.