Abstract: With the progress of decommissioning of old nuclear facilities, the supporting concrete chimney is also facing decommissioning. At present, China has no engineering experience in the decommissioning of large radioactive chimneys. In consideration with the structural characteristics of the chimney to be decommissioned in China, this paper analyzed technical routes for the decommissioning of radioactive chimneys. Removal technology for process pipes inside the chimney and decontamination process technology of the inner wall were studied; key equipment was developed; and solutions to difficult problems in decommissioning technology were proposed.

Key words: radioactivity, concrete chimney, decommissioning