Abstract
Helium circulator is the largest rotatable component of the 10 MW high temperature gas-cooled reactor (HTR-10). There are some radioactive contamination risk on the environment and personnel during the process of maintaining the helium circulator after long term power operation. Radiation dose monitoring, contamination source control, atmosphere isolation, process control, maintenance personnel training, experience feedback and etc. are employed during the maintaining process. Radioactive pollution risk on the environment and personnel are well controlled.
