EMERGENCY COOLING ARRANGEMENT FOR A NUCLEAR REACTOR PLANT AND PROCESS FOR THE EMERGENCY COOLING OF A REACTOR CORE

摘要

The invention concerns an emergency cooling arrangement for a nuclear reactor plant, the arrangement comprising a safety container (10) housing a pressurized reactor container (2) which comprises a reactor core (3). A flood pipe (4, 4a) is provided which has an outlet opening (6, 6a) which is disposed in or on the pressurized reactor container (2) and is closed by a passively opening closure element (5, 5a). The closure element (5, 5a) opens the outlet opening (6, 6a) when a limiting temperature is exceeded. For this purpose, the closure element (5, 5a) preferably comprises a safety fuse (27) which melts at approximately 900 DEG C. The flood pipe (4, 4a) is connected to a flooding container (8) disposed geodetically above the reactor core (3), whereby coolant (11) is fed by gravity into the pressurized reactor container (2). In order to ensure that the flood pipe (4, 4a) is not triggered spuriously, it comprises outside the pressurized reactor container (2) an additional closure element (16) which closes the flood pipe (4, 4a) during normal operation and opens the flood pipe (4, 4a) in the event of a malfunction, when the temperature in the pressurized reactor container (2) increases drastically but is lower than that of the closure element (5, 5a), in particular approximately 500 DEG C. The invention further concerns a process for the emergency cooling of a reactor core (3) by means of a flood pipe (4, 4a) which is closed by a passively opening closure element (5, 5a).