Apparatus for cooling and protecting a reactor pressure vessel in the event of a core melting accident

摘要

An arrangement for cooling a reactor pressure vessel (3) comprises a coolant storage vessel, a wall that surrounds at least the bottom of the vessel, and which forms an intermediate space, a cooling unit (40) which partially surrounds the wall, and a container for a heat carrier. When the latter reaches a predetermined temperature, the heat carrier is released into the intermediate area (32). The heat carrier (23) has a melting point of 100-300 degrees C and a boiling point greater than 2000 degrees C.