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一、前言 为了检验在低浓铀范围内采用适当紧密的窄栅格活性区布置实现中子阱型堆的物理设计的可靠性,利用经过改装的原有重水零功率装置进行了大量的重水宽栅格和窄栅格零功率实验。零功率实验方案的确定,是以直接校验物理设计中反应性、中子通量等宏观物理量是否满足堆改建要求为主要目的,而不过多地追求堆物理中某些基本参数的测量。由于工程进度要求及时提供必要的实验数据,而当时还未生产~(235)U浓度为3％的金属铀元件,所以,首先做
I. INTRODUCTION In order to test the reliability of the physical design of a neutron-trap reactor with an appropriately tight arrangement of narrow grid active regions within the LEU range, a large amount of heavy water width Grid and Narrow Grid Zero Power Experiments. The determination of zero-power experiment scheme is based on the direct verification of whether the macroscopic physical quantities such as reactivity and neutron flux in the physical design meet the requirement of heap rebuilding and not just the measurement of some basic parameters in heap physics. Due to the progress of the project in time to provide the necessary experimental data, but at the time has not yet produced ~ (235) U concentration of 3% of the metal uranium elements, so the first to do