26 results about "Spacer grid" patented technology

The invention relates to the field of supercritical water reactor thermal analysis, in particular to a positioning grid correction-based multichannel supercritical water reactor thermal analysis method, which comprises the following steps of: acquiring real-time nuclear reactor working condition data under a target supercritical condition; the nuclear reactor working condition data are input into a multi-channel supercritical water reactor thermal model, a global calculation result is obtained, and the multi-channel supercritical water reactor thermal model is a multi-channel model established based on the influence of a positioning grid; and analyzing according to the global calculation result to obtain an evaluation result of the influence of the positioning grillwork on the performance of the reactor core under the supercritical condition. According to the method, local positioning grillwork simulation is not needed, the geometric dependence and the complexity of earlier-stage treatment are reduced, and the efficiency of analyzing the thermal performance of the supercritical water reactor influenced by the positioning grillwork is improved.

The present invention relates to a nuclear fuel assembly suitable for a small modular reactor (SMR), the nuclear fuel assembly comprising: a spacer grid (110) having 17x17 grid cells; a plurality of fuel rods (120) arranged in the grid cells of the spacer grid (110); guide tubes (130) arranged and fixed in the grid cells of the spacer grid (110); and an upper end fitting (140) and a lower end fitting (150) fixed to the upper end and the lower end of the guide tubes (130), respectively, wherein the guide tubes (130) are characterized in that eight guide tubes are arranged in the main axis directions (Ixx)(Iyy) with respect to the central cell of the spacer grid (110), four guide tubes are arranged in the diagonal direction (Ixy), and sixteen guide tubes are arranged in the non-diagonal directions (Ixxy)(Ixyy).

The nuclear fuel assembly comprises grids distributed along the length of nuclear fuel rods (4), the grids including spacer grids (14), at least one reinforcing grid (16), a lower end grid (18) and an upper end grid (20). The spacer grids (14) define, between them and together with the lower end grid (18) and the upper end grid (20), a plurality of intervals (15). The grids further include one or more intermediate mixing grids (22) and, optionally, an anti-debris grid (24) in which the lower ends of the nuclear fuel rods (24) engage.

The utility model discloses a safety isolation fence box, relates to the technical field of isolation fence installation boxes, and aims to solve the problems that an existing isolation fence box is simple in structure, an internal installation structure cannot be conveniently moved out of a box body, an isolation fence is inconvenient to install and overhaul, and the overall practicability needs to be improved. Two first rails are fixedly installed on the symmetrical inner walls of the box body respectively, second rails are slidably installed in sliding grooves of the first rails, four sliding block bases are slidably installed in sliding grooves of the second rails, and an installation support is installed between the four sliding block bases. An electric control box is fixedly installed on the upper surface of the box body, through holes are formed in the lower surface of the electric control box and the upper surface of the box body, and the positions of the two through holes correspond to each other. And the effects that the internal mounting frame can be conveniently pulled out, the mounting and replacement operation of the isolation fence is facilitated, and the practicability is high are achieved.

A spacer grid element defining a grid (17) for receiving nuclear fuel rods (4) extending along an extension axis (A) and presenting a polygonal cross section, comprising at least three support sides (20) distributed around the extension axis (A), wherein each support side (20) comprises an inwardly protruding corrugation (24) on which at least one spring (32) for supporting a fuel rod (4) extending through the spacer grid element is formed.

The invention provides an embedded outdoor safety power cabinet, and relates to the technical field of power cabinets. The embedded outdoor safety power cabinet comprises a preset shell and a shielding frame, an operation table is arranged at the upper end of the preset shell, the shielding frame penetrates through the operation table, an interval grid plate is arranged on the inner side of the preset shell, a cooling interval is formed between the interval grid plate and the preset shell, a drainage mechanism is arranged on the inner side of the cooling interval, and a heat dissipation shell is arranged on the inner side of the preset shell. The heat dissipation shell is arranged on the inner side of the spacing grid plate. According to the embedded outdoor safety power cabinet, the interval grid plate is arranged, the cooling interval and the heat dissipation interval are formed on the two sides of the interval grid plate, cooling liquid on the inner side of the cooling interval can uniformly and continuously cool the interval grid plate, airflow circulates on the inner side of the heat dissipation interval plate, hot airflow can make contact with the interval grid plate, and the heat dissipation effect is improved. The air flow can be cooled, the effect of cooling the power cabinet is achieved, and the problem that an embedded power cabinet is poor in heat dissipation effect and cannot be effectively and continuously cooled is solved.

The invention relates to a ground-attached double-layer barrier water distributor, and belongs to the technical field of water distribution equipment, the structure of the water distributor comprises an energy-saving tank body, the upper part and the lower part of the energy-saving tank body are respectively provided with gravity flow gratings, and the two groups of gravity flow gratings divide the energy-saving tank body into a first uniform distribution area, a transition area and a second uniform distribution area from top to bottom; water distribution units are arranged in the first uniform distribution area and the second uniform distribution area; each water distribution unit comprises a main water supply pipe, a plurality of groups of auxiliary water supply pipes and a plurality of groups of uniform distribution outflow assemblies; the main water supply pipe is arranged in the energy-saving tank body, one ends of the auxiliary water supply pipes evenly communicate with the main water supply pipe, and the evenly-distributed outflow assembly communicates with the other ends of the auxiliary water supply pipes. The water distribution device has the technical effects that uniform water flow distribution of the whole tank section is realized, and impurities attached to the pipeline cannot be cleaned in time to maintain stable water distribution.

Disclosed is a nuclear fuel assembly suitable for a small modular reactor (SMR), wherein the nuclear fuel assembly includes a spacer grid having 17×17 lattice cells, a plurality of fuel rods, each arranged within an associated lattice cell of the spacer grid, guide tubes, each arranged and fixed within an associated lattice cell of the spacer grid, and a top nozzle and a bottom nozzle fixed to an upper end and a lower end of each guide tube, respectively, wherein, with respect to a center cell of the spacer grid, each of eight guide tubes is arranged in an associated one of principal axis directions Ixx and Iyy, each of four guide tubes in an associated one of on-diagonal directions Ixy, and each of 16 guide tubes in an associated one of off-diagonal directions Ixxy and Ixyy.

The utility model discloses a safety protection device for subway mechanical and electrical installation. The safety protection device comprises a protective fence and a grating net fixedly arranged in the protective fence. According to the protective fence, a frame is formed by transverse rods and vertical rods, connecting assemblies are arranged at the ends of the transverse rods, and different protective fences can be spliced. The grid net comprises rhombic or rectangular units. The protective fence is provided with a guide part and a sliding groove, a guide rod and a sliding block are installed in the sliding groove, and the sliding block is provided with a through hole matched with the guide rod and used for installing an illuminating lamp. The illuminating lamp is connected with the sliding block through a connecting mechanism, and the illuminating angle can be adjusted. The device effectively prevents personnel or articles from mistakenly entering a construction area, and ensures safe isolation. The design of the grid net ensures strength and stability, and observation and ventilation are facilitated. The guide component, the sliding groove, the sliding block and the guide rod provide stable and adjustable support for the illuminating lamp. The sliding block can freely slide to adjust the position of the lighting lamp, the connecting mechanism adjusts the irradiation angle, the lighting effect and use convenience are improved, misoperation is avoided, the accident probability is reduced, and the construction progress is guaranteed.

A nuclear fuel assembly comprises nuclear fuel rods (4) extending along a longitudinal axis (L) and a support skeleton (6) configured to support the nuclear fuel rods (4). The support skeleton (6) includes two end pieces (8, 10), a plurality of guide tubes (12) connecting the end pieces (8, 10) to each other, and spacer grids (14) attached to the guide tubes (12), with each spacer grid (14) supporting the nuclear fuel rods (4). The nuclear fuel assembly further includes at least one reinforcement device (20) comprising at least one reinforcement plate (22) which is in contact with at least two of the guide tubes (12) and attached to one or more of the guide tubes (12) at attachment points (21). Each reinforcement plate (22) has at least two attachment points (21) that are offset relative to each other along the longitudinal axis (L).

The spacer grid elements (18) define cells (16) for receiving nuclear fuel rods (4). The spacer grid elements (18) are configured to be arranged side-by-side with applying two side walls (22) of two adjacent spacer grid elements (18) one against the other. One of the two side walls (22) of at least one pair of side walls (22) applied against each other is provided with a lower flap (34) protruding from the lower edge of said side wall (22) such as to at least partially cover the lower edge (22A) of the other side wall and / or one of the two side walls (22) of said at least one pair of side walls (22) applied against each other is provided with an upper flap (34) protruding from the upper edge of said side wall (22) such as to at least partially cover the upper edge (22B) of the other side wall.

This disclosure relates to the field of isolation fence technology. One embodiment of this disclosure provides a wire mesh isolation fence that is easy to install and disassemble. It includes a first connecting frame, a first reinforcing plate, a connecting block, a second connecting frame, a protective net, a plug-in rod, a fixing block, a fixing pin, and a reinforcing mechanism. The first reinforcing plate is installed inside the first connecting frame, and the connecting block is slidably connected to the inside of the first reinforcing plate via an mounting groove. The second connecting frame is installed on the outer side of the connecting block, and the protective net is installed inside the second connecting frame. The outer surface of the plug-in rod penetrates the interior of the first reinforcing plate and the connecting block. The fixing block is slidably connected to the first connecting frame via an auxiliary groove. This technical solution addresses the problem in the prior art where it is difficult to replace parts of the wire mesh, leading to the need for operators to replace the entire mesh after partial damage.

The embodiment of the invention relates to the field of reactor fuel element assembly, in particular to a positioning grillwork suitable for a fuel assembly and the fuel assembly. The positioning grillwork comprises a frame and a plurality of grillwork units arranged in the frame in a matrix mode. Every two adjacent grillwork units are welded, each grillwork unit comprises four elements which are connected end to end, the four elements jointly form a channel for fuel elements to pass through, and each element abuts against the fuel element in the channel; the three elements of each grillwork unit are integrally formed parts, an elastic opening is formed in each integrally formed part, the fuel elements can enter the channels from the openings through elastic deformation of the integrally formed parts, and the fourth element of each grillwork unit is welded to the integrally formed parts after the fuel elements enter the channels. According to the positioning grillwork provided by the embodiment of the invention, the fuel element can be stably positioned, the fuel element can be prevented from being scratched in the assembling process, the risk that the fuel element is damaged and leaked is reduced, and the safety of the fuel assembly is improved.

A method (100) for building a new fuel assembly (1) is described. The method (100) comprises: determining (101) at least one parameter characteristic of a new reactor (13), determining (103) a first number of spacer grid cells (5) and corresponding first number of fuel rods (7), determining a second number of thimble tubes (9) and corresponding second number of receiving means (11), and positions of the receiving means (11) in relation to the spacer grids cells (5) within the spacer grid (3). The method comprises: assembling (105) at least one the new spacer grid (3), mounting (107) each of the second number of thimble tubes (9) in respective receiving means (11) of the second number of receiving means (11) within the at least one spacer grid (3) and loading (109) each of the first number of fuel rods (7) into respective spacer grid cell (5). A new fuel assembly (1) and a new nuclear reactor (13) are also described.

The utility model discloses an airport is with folding type isolation fence, including first support pole, one side of first support pole is installed folding pole, the inside installation of the hole is inserted into the plug, the both sides of inside of plug are all seted up with the insertion slot, the inside of insertion slot is inserted into the plug. The utility model discloses through setting up the hole in the inside of second support pole near the position of top end and bottom end, when needing to carry out extension, can take another group of folding pole and then in the inside of hole, let one plug rod pass through a first support pole and another group of second support pole, then in the inside of insertion slot, the insertion of plug block is fixed, so as to complete the extension installation between two groups or multiple groups in the process of working, and the hole below also uses the same way to carry out extension splicing, so that the extension work can be conveniently completed when working.

The present invention relates to an AI-based automatic correction system for laser welding positions on spacer grid, the system automatically correcting laser welding positions through deep learning. The AI-based automatic correction system for laser welding positions on spacer grid according to the present invention comprises: a vision unit (100) which learns image data collected through a camera to determine welding positions; a CNC unit (200) which indicates, to a welding head, the coordinates of welding positions based on the data received from the vision unit; and a welding unit (300) which corrects welding positions within a sealed chamber according to commands received from the CNC unit. The AI-based automatic correction system, for a laser welding position of a spacer grid, can automatically correct the coordinate values of laser welding positions on spacer grid, which supports nuclear fuel rods, via deep learning on the basis of images of the corresponding welding positions themselves (base material) visible in the images.

A nuclear fuel mechanism and an assembly method for the nuclear fuel mechanism. The nuclear fuel mechanism comprises a lower end plug (1) of a fuel rod, a lower nozzle assembly (2), and an adjustment assembly (3). An adjustment member (32) can drive a connecting member (31) to move, causing a debris prevention plate (21) to move horizontally relative to a nozzle body (22). In this case, the central axis of a constraint through hole (211) in the debris prevention plate (21) is misaligned with the central axis of a constraint counterbore (221) in the nozzle body (22), such that a limiting portion (12) of the lower end plug (1) of the fuel rod is restricted below the debris prevention plate (21). By means of restricting the limiting portion (12) of the lower end plug (1) of the fuel rod between the debris prevention plate (21) and the nozzle body (22), the axial movement of the fuel rod is limited. When the clamping force of a spacer grid is lost, it is ensured that the fuel rod does not move axially under a hydraulic lifting force or when a fuel assembly is subjected to an axial impact load, thereby avoiding exacerbating fretting wear between the grid and the fuel rod, and preventing failure of the fuel rod caused by the fuel rod falling and impacting the lower nozzle assembly (2).

A nuclear fuel assembly suitable for a small modular reactor (SMR) comprises: a spacer grid 110 having 17x17 lattice cells 120; a plurality of fuel rods, each arranged within an associated lattice cel

The utility model discloses novel highway separation fence installation equipment, a separation fence comprises a stand column and a fence piece net connected to the stand column, the installation equipment comprises a bearing assembly and an installation assembly arranged on the bearing assembly, and the installation assembly comprises a supporting piece for supporting the stand column and an installation piece arranged on the upper side of the supporting piece; the stand column is provided with a mounting section exposed out of the supporting piece, the supporting piece is provided with a first setting position arranged in the vertical direction and a second setting position arranged in the horizontal direction, and when the supporting piece is in the first setting position, the mounting piece can move back and forth towards the mounting section so as to mount the stand column to the ground; the mounting equipment further comprises a storage assembly arranged on the bearing assembly, a plurality of stand columns are sequentially stored in the storage assembly in the horizontal direction, and when the supporting piece is in the second setting position, the stand columns located in the storage assembly can move into the supporting piece. The stand column does not need to be manually supported during installation, automatic installation of the stand column is achieved, and the installation risk is reduced.

The utility model discloses a mining intrinsic safety type proximity switch, which comprises a mounting plate, the mounting plate is fixed at a working place through bolts, the side surface of the mounting plate is fixedly provided with an isolation fence, the side surface of the isolation fence is provided with a switch body, the side surface of the switch body is provided with a cable, the side surface of the isolation fence is provided with a winding mechanism, and the winding mechanism is provided with a cable. And the cable is inserted into the winding mechanism and is wound on the winding mechanism. Compared with the prior art, the winding mechanism is arranged, the driving mechanism in the winding mechanism is used for driving the movable frame and the threaded column to rotate, in the using process, the movable frame drives the sliding block and the guide frame through the threaded column, the cable is guided to be wound on the winding roller, and in the process, the threaded column rotates automatically, so that the cable is wound on the winding roller. The guide frame is driven to move through threaded transmission with the sliding block, the cable winding position is adjusted through the guide frame, the winding stability can be effectively improved, redundant cables can be wound conveniently, and the use safety is improved.

A nuclear fuel assembly suitable for a small modular reactor (SMR), wherein the nuclear fuel assembly comprises a spacer grid provided with 17x17 lattice cells, a plurality of fuel rods, each arranged in an associated lattice cell of the spacer grid, guide tubes, each arranged and secured within an associated lattice cell of the spacer grid, and an upper nozzle and a lower nozzle secured to an upper end and a lower end of each guide tube, respectively, wherein, relative to a central cell of the spacer grid, each of eight guide tubes is arranged in an associated one of major axis directions Ixx and Iyy, each of four guide tubes is arranged in an associated one of on-diagonal directions Ixy, and each of 16 guide tubes is arranged in an associated one of off-diagonal directions Ixxy and Ixyy.

A nuclear fuel assembly suitable for a small modular reactor (SMR) comprises: a spacer grid 110 having 17x17 lattice cells 120; a plurality of fuel rods, each arranged within an associated lattice cel

This nuclear fuel assembly spacer grid (16) defines a lattice of cells (20) for receiving fuel rods (18), wherein the spacer grid (16) comprises a peripheral band (22) composed of at least one peripheral strip (26) delimiting a portion of a peripheral contour (24) of the spacer grid (16), wherein at least one peripheral strip (26) defines a protruding protrusion (28). The protruding protrusion (28) further comprises a reinforcing part, the thickness of the protrusion (28) being superior to the thickness of the peripheral strip (26)

The spacer grid (14) comprises a plurality of tubular cells (18) for receiving fuel rods (4), each cell (18) having a polygonal cross section, with at least two support faces (20) and at least two connecting faces (22) alternating around the central axis (C), each support face (20) having a given at least in part convex shape toward the inside of the cell (18), each support face (18) bearing a protruding element area (24) intended to contact the fuel rod (4); each connecting face (22) having a given at least in part concave shape toward the inside of the cell (18); the support face (20) of a given cell (18) lays against one of the connecting faces (22) of a neighbouring cell (18), the convex shape and the concave shape being such that more than 50% of a surface area of said support face (20) outside the protruding element area (24) is in contact with said connecting face (22).

A hybrid spacer grid according to one embodiment of the present invention comprises: a flow path for mixing a coolant having a bending angle formed in a region in contact with a nuclear fuel rod; and a mixing vane extending in the flow direction of the coolant at a height downstream of the outlet of the flow path.