【摘要】 <正> 描述了中子符合环的下列应用实验方法:中子符合环的标定;贫乏铀（DU）元件棒在压水堆及沸水堆燃料组件中的分布,组件位置,镉、纸板及塑料薄膜,中子毒物（Gd₂O₃）等对符合计数率的影响和校正等。结果表明:（1）符合计数率随源到组件的距离的增加逐渐减少,但当组件被移动到某一确定位置之后,符合计数率随距离的增加而增加。（2）DU元更多还原

【Abstract】 Experiments have been carried out to calibrate the neutron coincidence collar and to understand the effects produced by the depleted uranium (DU) rod distribution in pressurized water reactor and boiling water reactor fuel assemblies, assembly positions, and the change resulted from the adding of cadmium, cardboard and plastic, burnable poison (Gd2O3) rods and so on. The results of the experiments show that: (1) The coincidence count rate decreased progressively when the distance from the source to the assembly was increased, however, when the assembly was moved beyond a certain position, it began to increase. (2) The deviation of the coincidence count rate could be as large as about 7- 5% for different DU rod distributions in the PWR assembly, while this value changed to 7%~9% when the same number of EU rods were used with different loading configurations in the fuel assembly. (3) When Cd liners were used, the contribution of epicadmium neutron would be larger; otherwise, the contribution of thermal neutron would be larger. The coincidence counting efficiency was increased when cardboard and plastic were added. (4) The coincidence count rate decreased with increasing number of poison rods; however, the decrease of the coincidence count rate would be less if Cd was used. The measurement precision of the coincidence count rate for PWR and BWR without Cd liners was less than 0. 5% ; otherwise, it would be less than 1 %.o-更多还原