一、前言高通量工程试验堆(HFETR)近年来采用无迥路小装载方案运行,主要生产以高(?)度~(60)Co为主的各种放射性同位素,并进行了多种材料、燃料等样品的辐照考验,其(?),核电站压力壳钢试样的辐照考验是一重要的考验任务。 HFETR装载布置的灵活性较大,我们结合第一、二炉的设计、试验和运行的经(?),根据堆上现有条件,在不改动堆芯各部件结构的情况下,对无遛路小装载的(?)芯布置方案、运行提棒方式及提高燃料元件平均燃耗深度等方面作了改进,提高了 I. INTRODUCTION The HFETR has been operating in recent years with a small load program without any interventions and mainly produces various radioactive isotopes with high (?) ~ (60) Co and various materials , Fuel and other samples of the radiation test, the (?) Nuclear power plant pressure test of the shell specimen irradiation is an important test task. HFETR loading arrangement flexibility, we combine the first, second furnace design, test and operation of the (?), According to the existing conditions on the pile, without changing the structure of the core components of the case, without walking Improved the layout of small-load (?) Core, the way of lifting rod and the improvement of the average fuel consumption depth of fuel element