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本文分析了中国科学院的研究性重水堆运行初期两次中毒碘坑实验值与理论值相差悬殊的原因。针对这些原因,在进一步的工作中考虑了重水堆的以下一些具体特点,因而得到理论与实验较为满意的符合:1.反应堆内控制棒栅的位置将影响自动调节律的效率;2.重水堆内光中子源的变化对测量反应性有影响;3.石墨层温度变化对自动调节棒电离室电流的影响;4.反应堆内中子通量分布不均匀,理论计算必须考虑这一影响。
This paper analyzes the reason why the experimental value of iodine pit between two poisoned heavy water reactors at the initial stage of the research heavy water reactor of Chinese Academy of Sciences is quite different from the theoretical value. For these reasons, the following specific characteristics of the heavy water reactor are taken into consideration in further work, and thus the satisfactory agreement between theory and experiment is obtained: 1. The position of the control rod grid in the reactor will affect the efficiency of automatic regulation of the law; 2. The heavy water reactor The change of inner photon neutron source has an influence on the measurement reactivity; 3. The influence of temperature change of graphite layer on the ionization chamber current of automatic adjustment rod; 4. The neutron flux distribution in reactor is not uniform, so the theoretical calculation must consider this effect.