3 results about "Core catcher" patented technology

A nuclear power plant has a nuclear reactor including a reactor pressure vessel which houses plural fuel rods containing fissile material. The nuclear power plant further has means for submerging the reactor pressure vessel in water and thereby water-cooling the reactor pressure vessel in the event of an emergency requiring cooling of the nuclear reactor. The nuclear power plant further has a primary core catcher outwardly of the reactor pressure vessel, the primary core catcher being formed of a material suitable for retaining molten corium in the event corium escapes the reactor pressure vessel. The nuclear power plant further has secondary core catcher outwardly of the primary core catcher, the secondary core catcher lining a tank which is water-filled in normal use of the plant to submerge and thereby water-cool the primary core catcher. The secondary core catcher is also is formed of a material suitable for retaining molten corium in the event corium escapes the primary core catcher.

A nuclear power plant has a nuclear reactor including a reactor pressure vessel containing a plurality of fuel rods containing fissile material. The nuclear power plant also has means for submerging the reactor pressure vessel in water to thereby water cool the reactor pressure vessel in the event of an emergency requiring cooling of the nuclear reactor. The nuclear power plant also has a primary core catcher located outside the reactor pressure vessel, the primary core catcher being made of a material adapted to retain molten core material in the event that the core material escapes the reactor pressure vessel. The nuclear power plant also has a secondary core catcher outside the primary core catcher, the secondary core catcher being lined with a tank that is filled with water in normal use of the nuclear power plant to submerge the primary core catcher and thereby water cool the primary core catcher. The secondary core catcher is also made of a material adapted to retain molten material in the event that the molten material escapes the first core catcher.

This invention relates to an anti-falling core cylinder, an anti-falling core sampler, and their working method. The core cylinder includes a cylinder body, a core catcher, and a sealing cap. The inner wall of the lower end of the cylinder body has a conical surface for engaging with the sealing cap, with the lower diameter of the conical surface being smaller than the upper diameter. The core catcher and the sealing cap are both installed inside the lower end of the cylinder body, with the core catcher positioned above the sealing cap. One end of the sealing cap is rotatably connected to the cylinder body via a shaft, and the edge of the sealing cap is an inclined surface adapted to the conical surface of the core cylinder. A spring is provided between the sealing cap and the cylinder body. Under the action of the spring, the sealing cap flips downwards around the shaft until it closes with the conical surface of the core cylinder on the cylinder body. The core cylinder of this application has an automatically closing sealing cap at its lower end. When the core enters the core cylinder, the sealing cap automatically closes, preventing rock debris from falling onto the valve seat sealing surface of the pressure-holding sealing mechanism. This ensures smooth closure of the valve disc and valve seat, improving the pressure-holding performance of the pressure-holding core sampler and increasing the success rate of pressure-holding core sampling.