system for the removal of heat from radioactive decay of fission products in nuclear reactors

摘要

1536350 Emergency cooling arrangement HOCHTEMPERATUR - KERNKRAFTWERK GmbH (HKG) GEMEINSAMES EUROPAISCHES UNTERNEHMEN 1 April 1976 [12 April 1975] 13286/76 Heading G6C In the event of a fault or faults occurring in a gas-cooled high temperature nuclear reactor whereby the normal operational systems of the reactor are inadequate to remove the decay heat, this is effected by introducing water into the reactor core. It is admitted to be a catastrophe measure, in that the reactor becomes unusable without major servicing. The water is preferably desalinated and a metered amount is introduced at the top of the core after neutron flux has been shut down by introduction of absorber rods. Alternatively absorber material, e.g. boron compounds may be added to the water. Thermal shock is stated to be minimized by a film of steam which forms over the spherical core elements. Condensed steam from the core may be recycled and safety valve may be provided to relieve excess steam pressure within the pressure vessel in cases where the integrity of the vessel has not been destroyed.