A device for retaining molten matter outside the nuclear power plant after an accident

Abstract

An apparatus for retention of molten material for a Generation IV reactor after a nuclear power plant accident comprises an inner wall which is peripherally closed, a vapor channel wall with an opening at the bottom fixed in the inner side of the inner wall, a pressure vessel disposed in the vapor channel wall, a vapor rising channel formed between the pressure vessel and the vapor channel wall, and it further comprises an outer wall surrounding the inner wall, a core molten material retention apparatus fixed at the bottom of the inner wall, and a deflector keeping away from the inner wall and the core molten material retention apparatus to form a gap; wherein a coolant falling channel is formed between the outer wall and the deflector, a coolant inlet is disposed at the bottom of the deflector, and a coolant channel is disposed between the inner wall and the core molten material retention apparatus; a core molten material retention recess is disposed at the upper surface of the core molten material retention apparatus, and the lower surface of the core molten material retention apparatus is arch-shaped; the core molten material retention apparatus is made of non-metal inorganic fireproof material. The invention adopts the design of molten material retention outside the reactor, using different material containing molten material and cooling the molten material by coolant cycle and the deflector structure, thus to improve the safety of the nuclear power plant.

Description

technical field [0001] The invention relates to a device for retaining molten matter outside a nuclear power plant after an accident, in particular to a device for retaining molten matter outside a nuclear power plant after an accident by adopting a completely passive cooling design of the core to improve the safety of the nuclear power plant. Background technique [0002] Molten retention technology is an important mitigation measure for nuclear power to deal with severe accidents, which can effectively solve the radioactive release and maintain the integrity of the safety boundary. At present, the third-generation nuclear power plants have adopted severe accident mitigation measures after the pressure vessel is damaged. [0003] AP-1000 adopts passive measures for preventing and mitigating severe accidents, mainly including setting up a molten core retention facility (IVR). The space between the outer wall of the vessel and the heat insulation layer of the reactor pit is ...

AI Technical Summary

Problems solved by technology

It is worth noting that once the core melt melts through the pressure vessel, the IVR will be powerless

Images