铅铋冷却反应堆补偿棒组件概念设计与分析

Conceptual design and analysis of the shim-rod assembly for lead-bismuth eutectic(LBE)cooled reactor

根据铅铋冷却反应堆补偿棒运行面临的液态铅铋的高密度高浮力环境特点,设计了一种补偿棒组件结构方案,包括吸收体棒束、棒束抓手、配重体、内套筒、外套管等.通过有限元方法对组件承力部件内套筒和棒束上抓手进行了力学分析,计算比较了内套筒应力变化规律,分析验证了棒束上抓手的结构可行性,在此基础上确认了铅铋冷却反应堆补偿棒组件结构设计方案的合理性,为铅铋反应堆内其他面临同样高密度高浮力环境的其他构件设计提供了参考.

A structure scheme of shim-rod assembly including absorber bundle,gripper,ballast,inner wrapper,wrapper etc.was proposed to solve the problem caused by the high density and high buoyancy coolant in the lead-bismuth cooled reactor.The mechanical analysis of the inner wrapper and the upper gripper was carried out based on the computation performed by finite element method.The stress changing tendency of the inner wrapper was analyzed and the structure of the upper gripper was verified,which indicates the feasibility of the shim-rod assembly design,providing a reference for other internals facing similar environments in LBE cooled reactors.