我国第一座实验性重水反应堆,自1958年投入运行到1978年停堆改建,二十年的运行过程中,大量的磨损物(如~(59)Co)和腐蚀物混入重水回路,在活性区经中子照射后,形成~(60)Co等放射性元素;同时,堆在运行期间曾发生过元件熔烧事故和元件破损事故,致使裂变产物和金属铀进入重水回路。造成回路系统各房间中的γ照射量率很高,因此有必要对回 The first experimental heavy water reactor in our country was put into operation from 1958 to the shutdown and reconstruction in 1978. In the course of two decades of operation, a large amount of abrasives (such as ~ (59) Co) and corrosion products were mixed into the heavy water circuit, After the neutron irradiation in the area, ~ (60) Co and other radioactive elements were formed. At the same time, there occurred accidental melting and component damage during the operation of the reactor, resulting in the fission products and uranium entering the heavy water circuit. Resulting in a loop system in the room a high rate of γ irradiation, it is necessary to back