Feasibility of Dismantling the Biological Shield by the Blast-Hole Technique. Final Report

摘要

In order to demolish a decommissioned nuclear power plant, the first step is necessarily dismantling of the activated and contaminated structures. A careful explosive dismantling technique is developed for separation of the radioactive inner part of the biological shield (steel-reinforced concrete) of light-water reactors, and the parameters which determine the effectiveness of the technique are examined. These parameters include those characteristics of the technique which depend on the blast-hole technique, as well as the side effects on the surroundings, particularly building shock load and release and containment of aerosols. It is concluded that stepwise separation of the radioactive concrete can be achieved in several large-area blasts in compliance with the safety regulations. In this process the radioactive concrete is ejected in the form of small-size rubble from the reinforcing framework, so that the reinforcing bars, which contain the major part of the radioactivity, can be conditioned separately. (ERA citation 10:031038)