论文部分内容阅读
核设施中反应堆的核心是核燃料组件,核燃料组件的特性直接关系到核设施的安全运转及核燃料的有效利用,核燃料组件是由一定排列的燃料棒组成的,上百个燃料芯块叠加成棒,反应堆运行期间燃料元件会在固态及气态裂变产物、热应力、中子辐照等因素的综合作用下发生肿胀、开裂,严重的情况下会出现破碎,芯块的肿胀会对包壳产生挤压,使包壳变形甚至直接将包壳挤破,肿
At the core of a nuclear facility are the nuclear fuel assemblies. The characteristics of the nuclear fuel assemblies are directly related to the safe operation of the nuclear facilities and the efficient utilization of nuclear fuel. The nuclear fuel assemblies are composed of fuel rods arranged in a series. Hundreds of fuel pellets are superposed into rods, During the operation of the reactor, the fuel element will swell and crack under the combined effect of solid and gaseous fission products, thermal stress and neutron irradiation, and will crush under severe conditions. The swelling of the pellet will squeeze the cladding , Deform the cladding or even crush the cladding directly, swollen