Many nuclear reactor cores consist of radioactive fuel rods dunked in water. 许多核反应堆的核心部分就是由浸在水中的放射性燃料棒组成。
The threat comes within days of Pyongyang saying it had begun reprocessing spent fuel rods at its Yongbyon nuclear plant. 这个威胁是在朝鲜宣布它已经在宁边的核设施内开始再处理使用过的乏燃料棒之后几天内发出的。