CORE CONTAINMENT DEVICE IN NUCLEAR REACTOR INSTALLATION AND EMERGENCY COOLING ON CORE MELT-THROUGH

摘要

In an installation for nuclear reactors, in particular for light water reactors, a core confinement device (CC) provided with a coolable collecting tank (19) is placed inside a reactor cavity (8) and at the - below the reactor vessel (6). The collecting tank (19) has an envelope wall (21) which extends at least approximately up to the height of the reactor core (10), and a bottom wall (20). The bottom and envelope walls (20, 21) of the collecting tank (19) are mounted with an intermediate space (28) relative to the bottom (7.1) or to the circumferential wall (7.2) of a support structure and protection (7) of the reactor vessel (6). Cooling channels (29.1, 29.2) are provided in this intermediate space on the bottom side and on the jacket side for external cooling of the collecting tank (19) with a coolant as well as, in the flat region of the bottom wall (20). , turbulence elements (34, 34a) for producing a turbulent flow of the coolant flowing from the inside to the outside to the envelope wall (21) passing through the bottom wall (20 ). Also described are the core containment device (CC) itself, a method for activating and maintaining external emergency cooling of the collecting tank (19) as well as the use of delta wings producing turbulence, which are located in the cooling system of the collecting tank (19), in the region of the bottom wall of the latter.