8 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.

To provide a floating-type nuclear power generation system capable of advantageously resisting core meltdown.SOLUTION: The floating-type nuclear power generation system includes: a reactor; a turbine generator driven by steam generated by heat of the reactor; and a floating body in which the reactor and the turbine generator are arranged and which is moored on the sea, the floating body having, below the reactor, a core catcher filled with ballast water of a bottom ballast tank formed in the bottom portion of the floating body by a double-hull structure in the lower side.SELECTED DRAWING: Figure 8

Disclosed is a floating-type nuclear power generation system capable of advantageously countering core meltdown. The present disclosure is a floating-type nuclear power generation system comprising: a nuclear reactor; a turbine generator that is driven by steam generated by the heat of the nuclear reactor; and a floating body in which the nuclear reactor and the turbine generator are disposed and which is moored on the sea. The floating body has, on the lower side of the nuclear reactor, a core catcher, the lower side of which is filled with ballast water in a ship-bottom ballast tank formed, in a double hull structure, at the bottom portion of the floating body.

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.

The present invention relates to a core catcher configured to facilitate the flow of cooling water and improve cooling performance. The core catcher of the present invention comprises: a main body container formed to accommodate a core melt dropped from a nuclear reactor pressure container and having the bottom formed of inclined surfaces corresponding to each other; a lower structure installed to be spaced apart from the bottom of the main body container to form a cooling flow path and having a cooling water inlet for supplying cooling water to the cooling flow path along the center thereof; a plurality of supports installed to maintain a space between the main body container and the lower structure; and cross-flow / down-flow isolation partition walls installed at respective longitudinal ends of the cooling flow path to reduce irregular cross-flow and down-flow of the cooling water flowing through the cooling flow path.

Disclosed is a floating-type nuclear power generation system capable of advantageously countering core meltdown. The present disclosure is a floating-type nuclear power generation system comprising: a nuclear reactor; a turbine generator that is driven by steam generated by the heat of the nuclear reactor; and a floating body in which the nuclear reactor and the turbine generator are disposed and which is moored on the sea. The floating body has, on the lower side of the nuclear reactor, a core catcher, the lower side of which is filled with ballast water in a ship-bottom ballast tank formed, in a double hull structure, at the bottom portion of the floating body.

Core catcher (100) with a retractably extensible support column (110) between a lower landing foot (112) and an upper debris receptacle (104). Lower leg brackets (130) are radially positioned about the support column spaced above the landing foot. Respective legs (106) pivotally connected to the leg brackets with free ends (160) independently pivotable between a retracted position (102) with the free ends adjacent the support column and an extended position (118) with the free ends spaced away from the support column to engage a stabilizing surface (B1). Method of catching a core drilled from an elevated deck using the core catcher is also disclosed.