Chapter 11 - Dismantling Techniques

Abstract

Nuclear decommissioning invariably involves dismantling of plant and equipment that has some degree of radioactive contamination. Dismantling methods generally involve size reduction of the plant and equipment to allow it to be handled and packaged. There are several methods used for dismantling of plant and equipment. Mechanical cutting involves techniques where mechanical force is used to cut material. Mechanical methods have the advantage of producing secondary wastes that are relatively easy to handle, and can be collected for disposal. Thermal cutting is generally faster than mechanical cutting, and the equipment tends to be lighter. However, it has the disadvantage of producing aerosols and particulates, which are a potential hazard to workers and the environment, and can spread contamination. This means that an efficient system for air filtration is required, preferably as close as possible to the work piece. They are also a potential fire hazard, particularly if there is inflammable or combustible material nearby. Moreover, technological advancements have made it possible to carry out dismantling operations by using remote handling techniques such as master-slave manipulators, power manipulators, telerobots, and wheeled or tracked vehicles.