杂质硼在高温气冷堆中的燃耗特性

Boron Depletion in High-Temperature Gas-Cooled Reactor

在球床式高温气冷堆的堆芯和石墨反射层中,不可避免地含有少量杂质硼。硼杂质的存在及其燃耗会对反应堆的反应性产生影响。对于多次通过的球床堆芯,根据燃料元件的运行历史计算所有元件的硼燃耗,对于中子注量率差别较大的反射层,分区计算了硼燃耗。再采用微扰理论,计算燃耗过程中硼反应性价值的变化。计算结果表明,硼杂质燃耗很快,因此,硼杂质对反应性的影响降低很快。

There is a small quantity of boron as impurity in the core and graphite reflector of pebble bed high-temperature gas-cooled reactor （HTR）. Boron and its change along depletion have influence on the reactivity of the reactor. The depletion characteris- tics of boron were calculated for each batch of fuel element along its operation history for the multi-pass pebble bed core, and for each region of graphite reflector. The reactivity worth of boron and its change along depletion were calculated with the pertur- bation theory. According to the analysis, the boron is depleted rapidly, therefore the influence on the reactivity also reduces rapidly.