压水堆核电站氧化停堆过程一回路冷却剂中58Co活度浓度分析

压水堆核电站氧化停堆过程中,一回路冷却剂中⁵⁸Co的停堆释放峰值可达上百个GBq/t,对工作人员的职业照射剂量及停堆进程都有很大影响。本文介绍了压水堆核电站氧化停堆过程,分析了对⁵⁸Co活度浓度变化有显著影响的因素,如一回路水化学、蒸汽发生器传热管材料、循环中停堆、化学和容积控制系统的净化等,同时提出了相关建议。

Analysis of 58Co activity concentration in primary coolant during PWR oxygenation shutdown

In the process of oxygenation operation during cold shutdown, the ⁵⁸Co release peak in the primary circuit can reach the value of about hundreds GBq/t, which has a notably effect on the occupational exposure and the shutdown process. This paper introduces the PWR oxygenation shutdown. Several key factors affecting the ⁵⁸Co activity concentration in the primary coolant during oxygenation shutdown are analyzed, including the primary coolant chemistry, material composition of steam generation tubes, mid-cycle shutdowns, the purification of chemical and volume control system. Based on these factors, some proposals are proposed.