A method for disassembling a built in a reactor pressure vessel of a nuclear power plant lower core scaffold

摘要

In a method for disassembling a lower core framework (12) installed in a reactor pressure vessel (8) of a nuclear power plant, the overall height of which is greater than the distance between the upper edge of the opened reactor pressure vessel (8) and the water level (4) of a working level that can be walked on ( 23) flooded reactor pit (2), the core structure (12) is raised to an intermediate position in which it is located completely below the water level (4) and only with an upper part (22) projects beyond the upper edge of the opened reactor pressure vessel (8). In this intermediate position, the core structure (12) is placed at least indirectly on the upper edge of the open reactor pressure vessel (8) and then the upper part (22) is separated from the core structure (12). This procedure prevents the core structure (12) from projecting over the water surface (4) of the flooded reactor pit (21) during transport.