13 results about "Core catcher" patented technology

The present invention relates to a core drilling assembly, comprising an outer barrel assembly that includes a drill bit at one end and a coupling for connection to the drill rods at the other end thereof, the outer barrel assembly carrying an inner tube assembly that includes at least a core catcher, an inner tube and a head assembly, the core catcher being configured to grip and rotationally fix at least a section of the core sample relative to the core catcher thus also the inner tube and head assembly thereof, also including, - a measuring device being connected to the forward end of the head assembly, being mechanically and electromagnetically shielded from the outer environment, - the measuring device comprising at least a sensor and a data storage configured to measure and store the rotational orientation of the head assembly.

The present invention relates to a core catcher which can improve cooling performance. The core catcher, according to the present invention, comprises: a main body container formed to accommodate a molten core material which has descended from the nuclear reactor pressure vessel and having sloped surfaces, which correspond to each other, in the lower part thereof; and a lower structure spaced apart from the lower part of the main body container to form a cooling channel therebetween and having a coolant inlet for supplying the coolant to the cooling channel along the central part of the lower structure, wherein the bottom surface of the main body container is formed in a wavy shape so as to increase the contact surface area with the coolant.

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 core catcher system according to an embodiment of the present invention, which prevents unnecessary supply of cooling water from a cooling water tank, comprises: a core molten material monitoring sensor assembly including an expansion sensor and a stress sensor which are attached to the outer wall of the lower portion of a nuclear reactor, an infrared sensor which measures a temperature of a reactor cavity, and a wind pressure-wind velocity sensor for measuring an air flow in the reactor cavity; a determination unit for determining whether the outputs of the expansion sensor and the stress sensor are equal to or greater than a predetermined value and whether the outputs of the infrared sensor and the wind pressure-wind velocity sensor are equal to or greater than a predetermined value in the core molten material monitoring sensor assembly; and a control unit for operating a valve unit of the cooling water tank for supplying cooling water to a core catcher when the determination unit determines that any one of the output values of the expansion sensor and the stress sensor is equal to or greater than the predetermined value and any one of the output values of the infrared sensor and the wind pressure-wind velocity sensor is equal to or greater than the predetermined value.

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

The utility model relates to the technical field of downhole tools, in particular to a self-locking core cutting mechanism for taking a large-diameter core. The self-locking core cutting mechanism for taking the large-diameter core comprises a coring drill bit, an outer cylinder, an inner cylinder and a core catcher, the outer cylinder is sleeved with the coring drill bit, the inner cylinder is arranged in the outer cylinder, the core catcher is arranged in the inner cylinder, the left end of the core catcher is embedded into the inner cylinder, and the right end of the core catcher protrudes out of the inner cylinder. According to the self-locking core cutting mechanism for taking the large-diameter core, the core catcher is matched with the inner wall of the coring drill bit to carry out coring work, so that the inner cylinder can be thinner, the radial coring space is saved, and the core with a larger diameter can be obtained; the distance between the core catcher and the inner cylinder is shortened, so that no gap exists when the core enters the cylinder, and the core can enter the inner cylinder to complete coring work; the drilling fluid is subjected to annular flow-back through the through holes formed in the inner wall of the coring drill bit, and the purposes of circulating the drilling fluid, cooling the drill bit and improving the coring work efficiency are achieved.

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.

The invention belongs to the technical field of petroleum and natural gas drilling engineering, and discloses a pressure-maintaining and shape-preserving coring tool. The tool comprises a suspension assembly, an outer cylinder, an inner cylinder, a ball valve and a coring drill bit, the suspension assembly, the outer cylinder and the coring drill bit are sequentially and axially connected, the inner cylinder and the ball valve are both arranged in the outer cylinder, the ball valve is connected to the lower end of the inner cylinder, and an annular space is formed among the inner cylinder, the ball valve and the outer cylinder. A pressure maintaining bushing is inserted into the inner cylinder, the rock core can enter the pressure maintaining bushing through the ball valve, the inner cylinder can be connected with an air source, and the air source is configured to inflate the inner cylinder. The tool further comprises a pressure maintaining assembly, the pressure maintaining assembly comprises a sealing connector, the sealing connector is arranged between the inner barrel and the ball valve and makes sealing contact with the ball valve, and a core catcher is arranged in the sealing connector and used for cutting off the core. The tool is used for coring operation, the integrity rate and the yield rate of a rock core can be effectively guaranteed, and the coring efficiency is improved.

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.