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在热室中 ,用γ扫描装置对秦山核电厂 3× 3 -2考验组件中辐照历史、燃耗及冷却时间不同的两根燃料棒中的铯活度比A(13 4 Cs) /A(13 7Cs)的轴向分布进行了测量 ,并利用自行开发的压水堆燃料棒破损特性分析程序FCAC进行了理论计算。结果表明 :辐照和停堆冷却过程中燃料棒中铯原子的轴向迁移可以忽略 ,燃料棒中铯活度比的轴向分布由燃耗的轴向分布决定。
In the hot chamber, the cesium activity ratio of two fuel rods with different irradiation history, fuel consumption and cooling time in a 3 × 3 -2 test unit of Qinshan Nuclear Power Plant was compared with A (13 4 Cs) / A (13 7Cs) were measured and the theoretical calculation was carried out by using the self-developed FCAC program. The results show that the axial migration of cesium atoms in fuel rods during irradiation and shutdown cooling can be neglected. The axial distribution of cesium activity ratio in fuel rods is determined by the axial distribution of fuel consumption.