CN113674877A - Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement - Google Patents
Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement Download PDFInfo
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- CN113674877A CN113674877A CN202110801776.3A CN202110801776A CN113674877A CN 113674877 A CN113674877 A CN 113674877A CN 202110801776 A CN202110801776 A CN 202110801776A CN 113674877 A CN113674877 A CN 113674877A
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- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 title claims abstract description 55
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 51
- 229910052797 bismuth Inorganic materials 0.000 title claims description 20
- 238000001228 spectrum Methods 0.000 title claims description 17
- 239000000446 fuel Substances 0.000 claims abstract description 109
- 230000000712 assembly Effects 0.000 claims abstract description 105
- 238000000429 assembly Methods 0.000 claims abstract description 105
- 238000005253 cladding Methods 0.000 claims abstract description 57
- 239000002826 coolant Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 15
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000006096 absorbing agent Substances 0.000 claims description 7
- 229910001152 Bi alloy Inorganic materials 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002139 neutron reflectometry Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C7/00—Control of nuclear reaction
- G21C7/28—Control of nuclear reaction by displacement of the reflector or parts thereof
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
- G21C3/328—Relative disposition of the elements in the bundle lattice
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C5/00—Moderator or core structure; Selection of materials for use as moderator
- G21C5/14—Moderator or core structure; Selection of materials for use as moderator characterised by shape
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C5/00—Moderator or core structure; Selection of materials for use as moderator
- G21C5/14—Moderator or core structure; Selection of materials for use as moderator characterised by shape
- G21C5/16—Shape of its constituent parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the design technology of nuclear reactors, and particularly relates to a magnesium oxide reflecting layer assembly for a lead-based fast reactor and reactor core arrangement, wherein the reflecting layer assembly comprises an assembly box, a cladding, magnesium oxide and a coolant; the cladding is uniformly arranged in the axial direction, the center cladding is superposed with the center of the section of the component box, the rest cladding is uniformly distributed in the hexagonal section of the component box, and the centers of the sections of the adjacent cladding are equidistant. Arranging the reflecting layer assembly at the periphery of the core active area; a control rod assembly is arranged at the center of a core active area, hexagonal fuel assemblies with the enrichment degrees from low to high are uniformly arranged around the control rod assembly from inside to outside according to two layers of section hexagons respectively, and the rest control rod intervals are uniformly arranged in one fuel assembly with the enrichment degree. The method has the advantages that the improvement on the operation cycle of the lead-based fast reactor is more remarkable, a large amount of neutrons overflowing the reactor core can be reflected back to the reactor core, the neutron utilization rate is improved, and the operation cycle of the lead-based fast reactor is prolonged.
Description
Technical Field
The invention belongs to the design technology of nuclear reactors, and particularly relates to a magnesium oxide reflecting layer assembly for a lead-based fast reactor and a reactor core arrangement.
Background
The lead-based fast spectrum reactor adopts lead or lead-bismuth alloy as a coolant, and the lead or lead-bismuth alloy has the characteristics of weak neutron moderation, strong thermal conductivity, stable chemical property and the like, so that the lead-based fast spectrum reactor has excellent properties of neutron physics, thermal hydraulic power and system safety, and is incorporated into a 'fourth generation' advanced nuclear energy system approved by the international mainstream nuclear energy boundary.
Compared with a pressurized water reactor, the fast reactor has higher neutron leakage rate, and for reducing leakage and improving the operation period of the reactor, a large number of radial reflecting layer assemblies are generally arranged around a fuel area of a reactor core, and the radial reflecting layer assemblies can reflect neutrons overflowing the reactor core or a radial conversion area back to the reactor core or the conversion area so as to improve the neutron utilization rate and the multiplication ratio, and simultaneously can play a certain shielding role on gamma rays and neutrons and reduce the adverse effect of the neutrons and gamma irradiation on reactor equipment.
At present, stainless steel is mostly adopted as a reflecting material for a neutron reflecting layer assembly of a fast reactor. The neutron reflection capacity of the assembly is general, and the improvement on the neutron utilization rate is limited.
Disclosure of Invention
The invention aims to provide a lead-based fast reactor magnesium oxide reflecting layer assembly and a lead-bismuth fast reactor core arrangement, which can greatly reduce neutron leakage and improve neutron utilization rate.
The technical scheme of the invention is as follows:
a lead-based fast reactor magnesium oxide reflecting layer assembly comprises a hexagonal prism tubular assembly box, a plurality of package shells arranged in the assembly box, magnesium oxide and a coolant; the cladding is cylindrical, all the cladding are placed along the axial direction and are uniformly arranged in the cross section direction, the circle center of the cross section of one cladding is superposed with the circle center of the cross section of the assembly box, namely the cladding and the assembly box are concentrically and coaxially arranged, the rest cladding are uniformly distributed in the hexagonal cross section of the assembly box, and the distances between the circle centers of the cross sections of all the adjacent cladding are all equal;
the magnesium oxide is positioned in the cladding, the cladding and the magnesium oxide inside the cladding jointly form a reflector rod, and the gap between the assembly box and the cladding is completely provided with a coolant.
The cooling agent is arranged in the cladding, and the gap between the cladding and the component box is magnesium oxide.
The number of the cladding is equal to that the circle centers of the cross sections of the adjacent three cladding are arranged in an equilateral triangle.
The number of said envelopes is 7, 19 or 37.
The coolant is lead or lead-bismuth alloy.
The material of the component box is stainless steel.
The length of the cladding is the same as that of the component box, namely all the cladding penetrates through the length direction of the whole component box.
Arranging the lead-based fast reactor magnesium oxide reflecting layer assembly at the periphery of the core active area; a control rod assembly is arranged at the center of a core active area, hexagonal fuel assemblies with the enrichment degrees from low to high are uniformly arranged around the control rod assembly from inside to outside according to two layers of section hexagons respectively, and the rest control rod intervals are uniformly arranged in one fuel assembly with the enrichment degree.
Arranging the lead-based fast reactor magnesium oxide reflecting layer assembly at the periphery of the core active area; 114 hexagonal fuel assemblies are arranged in the core active area, and the fuel assemblies comprise fuel assemblies with 15.5% of enrichment degree, fuel assemblies with 17.5% of enrichment degree and fuel assemblies with 19.5% of enrichment degree which are uniformly arranged in two layers from inside to outside according to a section hexagon;
wherein 18 fuel assemblies with the enrichment degree of 15.5 percent, 36 fuel assemblies with the enrichment degree of 17.5 percent and 60 fuel assemblies with the enrichment degree of 19.5 percent are arranged;
the number of the lead-based fast reactor magnesium oxide reflecting layer assemblies is 90, and the lead-based fast reactor magnesium oxide reflecting layer assemblies are uniformly distributed on the periphery of a reactor core active area in two layers;
the number of the control rod assemblies is 7, one control rod assembly is arranged at the center of the core active area, and the other 6 control rod assemblies are arranged at the overlapped positions of the adjacent two sides of the first layer hexagon of the fuel assembly with the enrichment degree of 17.5%.
The number of the fuel assemblies with the enrichment degree of 15.5 percent is 18, all the fuel assemblies take one control rod assembly as a center, the fuel assemblies are divided into two layers and are uniformly arranged in a hexagon shape, the number of the first layers is 6, and the number of the second layers is 12; the number of the fuel assemblies with the enrichment degree of 17.5% is 36, the fuel assemblies with the enrichment degree of 17.5% are arranged on the periphery of the 18 fuel assemblies with the enrichment degree of 15.5% in a two-layer hexagonal mode, the first layer is provided with 2 fuel assemblies with the enrichment degree of 17.5% in the middle of each side, and a control rod assembly is arranged at the overlapped position of each two adjacent sides in the first layer, so that 6 control rod assemblies are arranged in the first layer; the second layer is uniformly provided with 24 fuel assemblies with 17.5 percent enrichment; the number of the fuel assemblies with the enrichment degree of 19.5% is 60, and the fuel assemblies with the enrichment degree of 17.5% are distributed at the periphery of the fuel assemblies in two layers, wherein the number of the first layers is 30, and the number of the second layers is 5 and 30; and arranging a reflecting layer assembly at the overlapped position of every two adjacent edges of the second layer.
Arranging the lead-based fast reactor magnesium oxide reflecting layer assembly at the periphery of the core active area; the core active area is internally provided with 54 hexagonal fuel assemblies which comprise 18 fuel assemblies with 15 percent of enrichment degree and 36 fuel assemblies with 19 percent of enrichment degree which are uniformly distributed in two layers from inside to outside according to the cross section hexagon;
the number of the lead-based fast reactor magnesium oxide reflecting layer assemblies is 68, and the lead-based fast reactor magnesium oxide reflecting layer assemblies are uniformly distributed on the periphery of a reactor core active area in two layers;
the number of the control rod assemblies is 7, one control rod assembly is arranged at the center of the core active area, and the other 6 control rod assemblies are arranged at the overlapped positions of the adjacent two sides of the first layer hexagon of the fuel assembly with the enrichment degree of 19%.
The control rod assembly comprises 37 control rod absorbers, and the control rod absorber is made of B4C。
The thickness of the cladding is 0.8mm, and the thickness of the component box is 2 mm.
The fuel assemblies each contained 169 cylindrical fuel element rods.
The fuel material is UO2The diameter of the fuel element rod is 12mm, and the height of the active section is 900 mm.
The invention has the following remarkable effects: compared with an integrated reflecting layer assembly adopting a lead oxide material, the invention has the advantages of more remarkable improvement on the lead-based fast reactor operation cycle, low density of the magnesium oxide material, high melting point, no toxicity, lower production cost and better economy. The reflecting layer assembly adopting the structure is usually used outside a reactor core fuel area, and can reflect a large amount of neutrons overflowing from the reactor core back to the reactor core when the reactor normally operates, so that the neutron utilization rate is greatly improved, and the reflecting layer assembly has important significance for prolonging the operating period of the lead-based fast reactor and improving the economical efficiency of the lead-based fast reactor.
After the reflecting layer assembly is arranged outside the fuel area of the reactor core, a large amount of neutrons overflowing the reactor core are reflected back to the reactor core, so that the neutron utilization rate of the reactor core is greatly improved, the operation period of the reactor is prolonged, and the economy of the lead-based fast spectrum reactor is improved.
Drawings
FIG. 1 is a cross-sectional view of a 7-rod magnesium oxide reflective layer assembly;
FIG. 2 is a longitudinal cross-sectional view of a 7-bar magnesium oxide reflector assembly;
FIG. 3 is a cross-sectional view of a 19-hole magnesium oxide reflective layer assembly;
FIG. 4 is a longitudinal cross-sectional view of a 19-hole magnesium oxide reflective layer assembly;
FIG. 5 is a schematic diagram of a 150MW lead bismuth fast spectrum reactor core arrangement;
FIG. 6 is a schematic diagram of a 75MW Pb-Bi fast spectrum reactor core arrangement;
in the figure: 1. cladding; 2. magnesium oxide; 3. a component cartridge; 4. a coolant; 100. a reflective layer assembly; 200. a control rod assembly; 300. fuel assemblies with 19.5% enrichment; 400. fuel assemblies with 17.5% enrichment; 500. fuel assemblies with an enrichment of 15.5%; 600. fuel assemblies with 19% enrichment; 700. fuel assemblies with an enrichment of 15%.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
Examples 1,
In the 7-rod magnesium oxide reflective layer assembly shown in fig. 1 and 2, the assembly box 3 is a cylindrical structure with a hexagonal section, namely a hexagonal prism tubular structure, a cylindrical cladding 1 is arranged in the assembly box 3 along the axial direction, magnesium oxide 2 is arranged in the cladding 1, and all gaps between the assembly box 3 and the cladding 1 are provided with coolant 4;
the cladding 1 and the magnesium oxide 2 inside the cladding 1 jointly form reflector rods, the cladding 1 is cylindrical, and therefore cylindrical reflector channels are formed, 7 reflector rods are arranged in the embodiment, and the reflector rods are uniformly distributed in a hexagonal section according to the position of the center of the section. The center of the cross section of the middle reflector rod is superposed with the center of the cross section of the hexagon, the remaining 6 reflector rods are uniformly distributed on the outer periphery of the central reflector rod, and the distances between the centers of the cross sections of all the adjacent reflector rods are all equal.
The coolant 4 is lead or lead-bismuth alloy;
the number of the reflector rods can also be 19, 37 and the like, as long as the number is satisfied, and the reflector rods are arranged in an equilateral triangle shape according to the circle centers of the cross sections of the adjacent three reflector rods.
The material of the component box 3 is stainless steel.
Examples 2,
In contrast to example 1, the magnesium oxide 2, the coolant 4 and the cladding 1 are arranged in the assembly box 3 in another manner.
As shown in fig. 3 and 4, the component box 3 is also a cylindrical structure with a hexagonal section, i.e. a hexagonal prism tubular structure, the cylindrical cladding 1 is placed inside the component box 3 along the axial direction, the number of the cladding 1 meets the rule that the distances between the circle centers of the sections of all three adjacent cladding 1 are all equal, the circle center of the section of the cladding 1 at the center coincides with the circle center of the section of the component box 3, and the number of the cladding 1 is 7, 19, 37, and the like.
Except that the inside of the cladding 1 is provided with a coolant 4 flow channel, and the gap between the cladding 1 and the component box 3 is magnesium oxide 2;
the number of cladding bodies 1 in this example is 19, so the magnesium oxide reflector assembly has 19 holes in cross-section, with coolant 4 flow channels in the holes.
The length of the envelopes 1 is the same as the length of the component cassette 3, i.e. all envelopes 1 run through the length of the entire component cassette 3.
As shown in fig. 5, a thermal state full power 150MW lead bismuth fast spectrum core arrangement is shown;
114 hexagonal fuel assemblies are arranged in the core active area in total, and the fuel assemblies comprise a fuel assembly 300 with the enrichment degree of 19.5%, a fuel assembly 400 with the enrichment degree of 17.5% and a fuel assembly 500 with the enrichment degree of 15.5%;
wherein the number of the fuel assemblies 500 with the enrichment degree of 15.5 percent is 18, all the fuel assemblies are uniformly arranged in a hexagon in two layers by taking one control rod assembly 200 as a center, the number of the first layers is 6, and the number of the second layers is 12;
36 fuel assemblies 400 with 17.5% enrichment degree are arranged at the periphery of the 18 fuel assemblies 500 with 15.5% enrichment degree in two layers in a hexagonal mode, wherein the first layer is provided with 2 fuel assemblies 400 with 17.5% enrichment degree in the middle of each side, and a control rod assembly 200 is arranged at the overlapped position of each two adjacent sides in the first layer, so that 6 control rod assemblies 200 are arranged in the first layer; the second layer is uniformly arranged with 24 fuel assemblies 400 with 17.5% enrichment;
60 fuel assemblies 300 with the enrichment degree of 19.5% are arranged at the periphery of the fuel assembly 400 with the enrichment degree of 17.5% in two layers, wherein the first layer is uniformly arranged for 30, and each edge of the second layer is uniformly arranged for 5 and 30; arranging a reflecting layer assembly 100 at the overlapped position of each two adjacent edges of the second layer;
all the remaining reflective layer assemblies 100 are uniformly arranged at the outermost side in two layers;
the number of all the reflective layer assemblies 100 is 90, the number of the control rod assemblies 200 is 7;
in this embodiment, three types of cores are used235The U enrichment degree components respectively account for 15.5%, 17.5% and 19.5% of the corresponding enrichment degrees. All fuel assemblies are arranged in the core active area from inside to outside in sequence.
Each fuel assembly adopts a design structure of fuel element rods and an assembly box, each fuel assembly contains 169 cylindrical fuel element rods, the diameter of each fuel element rod is 12mm, the height of an active section is 900mm, and fuel material is UO2The outer side length of the cross section of the component box is 117.5mm, the thickness of the component box is 2mm, and the component box is made of stainless steel.
The control rod assembly 200 adopts a control rod and assembly box design structure, each control rod assembly comprises 37 control rod absorbers, and the main absorption material of the control rods is B4And C, the diameter of the control rod is 23mm, and the height of the active section is 900 mm. Control rod groupThe component cartridge of the member 200 is the same size and material as the fuel assembly component cartridge.
In order to prolong the core life and improve the economy of the lead-based fast reactor, 90 magnesium oxide reflecting layer assemblies 100 are arranged at the periphery of the core active area (outside fuel assemblies), the structure of each reflecting layer assembly 100 adopts the design of the embodiment 1, 7 reflector rods are arranged in the reflecting layer assemblies 100, the diameter of each reflector rod is 80mm, the thickness of a cladding 1 is 0.8mm, and the height of the active section is 900 mm. The size and material of the cartridge 3 are the same as those of the fuel assembly. The calculated operating cycle of the reactor was extended by about 600 equivalent full power days compared to a reactor employing a conventional stainless steel reflector assembly.
FIG. 6 shows a hot, full power 75MW Pb-Bi fast spectrum core layout;
different from the 150MW arrangement mode, 54 hexagonal fuel assemblies are arranged in the core active area, namely 36 fuel assemblies 600 with 19% of enrichment degree and 18 fuel assemblies 700 with 15% of enrichment degree; 7 control rod assemblies 200; 68 reflective layer assemblies 100;
the arrangement mode is basically the same as the arrangement mode of the front 150MW, the center is provided with a control rod assembly 200, two layers of fuel assemblies 700 with 15% of enrichment degree, two layers of fuel assemblies 600 with 19% of enrichment degree and two layers of reflecting layer assemblies 100 are sequentially and uniformly arranged according to a hexagon from inside to outside, wherein the two adjacent edges of the hexagon of the fuel assembly 600 with 19% of enrichment degree of the first layer are respectively provided with one control rod assembly 200;
in the arrangement mode, all the components are arranged in a hexagonal equidistant mode, and two core types are adopted235The U enrichment degree component respectively has the corresponding enrichment degrees of 18 percent and 19.5 percent. All fuel assemblies are arranged in the core active area from inside to outside in sequence.
The fuel assemblies all adopt the design structure of fuel element rods and assembly boxes, each fuel assembly comprises 169 cylindrical fuel element rods, the diameter of each fuel element rod is 12mm, the height of each active section is 900mm, and the fuel material is UO2The outer side length of the component box 3 is 117.5mm, the thickness of the component box 3 is 2mm, and the component box is made of stainless steel.
The control rod assembly 200 adopts a control rod and assembly box design structure, each control rod assembly comprises 37 control rod absorbers, and the control rod absorber is B4And C, the outer diameter of the control rod is 23mm, and the height of the active section is 900 mm. The component cartridge is the same size and material as the fuel assembly.
In order to prolong the core life and improve the economy of the lead-based fast reactor, 68 magnesium oxide reflecting layer assemblies 100 are arranged at the periphery of the core active area (outside the fuel assemblies), the reflecting layer assemblies 100 adopt the design of embodiment 2, the reflecting body is provided with 19 cylindrical hole channels, the diameter of each hole channel is 20mm, the thickness of the cladding 1 is 0.8mm, and the height of the active section is 900 mm. The size and material of the cartridge 3 are the same as those of the fuel assembly. The calculated core operating period is prolonged by about 800 equivalent full power days compared with the reactor adopting the traditional stainless steel reflecting layer assembly.
Claims (16)
1. The utility model provides a lead-based fast reactor magnesium oxide reflection stratum subassembly which characterized in that: comprises a hexagonal prism tubular component box (3), a plurality of package shells (1) arranged in the component box (3), magnesium oxide (2) and a coolant (4); the cladding (1) is cylindrical, all the cladding (1) is placed along the axial direction and is uniformly arranged in the cross section direction, the circle center of the cross section of one cladding (1) is superposed with the circle center of the cross section of the assembly box (3), namely the cladding (1) and the assembly box (3) are concentrically and coaxially arranged, the rest cladding (1) is uniformly distributed in the hexagonal cross section of the assembly box (3), and the distances between the circle centers of the cross sections of all the adjacent cladding (1) are all equal.
2. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the magnesium oxide (2) is positioned in the cladding (1), the cladding (1) and the magnesium oxide (2) inside the cladding jointly form a reflector rod, and the space between the assembly box (3) and the cladding (1) is completely provided with a coolant (4).
3. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the cooling agent (4) is arranged in the cladding (1), and the magnesium oxide (2) is arranged in the gap between the cladding (1) and the component box (3).
4. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the number of the cladding (1) is equal to that of the circle centers of the cross sections of the adjacent three cladding (1) in an equilateral triangle.
5. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the number of the envelopes (1) is 7, 19 or 37.
6. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the coolant (4) is lead or lead-bismuth alloy.
7. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the component box (3) is made of stainless steel.
8. The arrangement of the lead-based fast reactor magnesium oxide reflecting layer assembly and the lead-bismuth fast reactor core of claim 1, wherein: the length of the cladding (1) is the same as that of the component box (3), namely, all the cladding (1) penetrate through the length direction of the whole component box (3).
9. The utility model provides a lead bismuth fast spectrum reactor core arranges which characterized in that: arranging the lead-based fast reactor magnesium oxide reflecting layer assembly (100) at the periphery of a core active area; a control rod assembly (200) is arranged at the center of a core active area, hexagonal fuel assemblies with the enrichment degrees from low to high are uniformly arranged around the control rod assembly (200) in two layers according to a cross section hexagon respectively from inside to outside, and the rest control rod intervals (200) are uniformly arranged in one fuel assembly with the enrichment degree.
10. The lead bismuth fast spectrum reactor core arrangement of claim 9, wherein: arranging the lead-based fast reactor magnesium oxide reflecting layer assembly (100) at the periphery of a core active area; 114 hexagonal fuel assemblies are arranged in the core active area in total, and the fuel assemblies comprise fuel assemblies (500) with 15.5% of enrichment degree, fuel assemblies (400) with 17.5% of enrichment degree and fuel assemblies (300) with 19.5% of enrichment degree which are uniformly arranged in two layers from inside to outside according to a section hexagon;
wherein 18 fuel assemblies (500) with the enrichment degree of 15.5 percent, 36 fuel assemblies (400) with the enrichment degree of 17.5 percent and 60 fuel assemblies (300) with the enrichment degree of 19.5 percent are arranged;
the number of the lead-based fast reactor magnesium oxide reflecting layer assemblies (100) is 90, and the lead-based fast reactor magnesium oxide reflecting layer assemblies are uniformly distributed on the periphery of a reactor core active area in two layers;
the number of the control rod assemblies (200) is 7, one of the control rod assemblies is arranged in the center of the core active area, and the other 6 control rod assemblies are arranged at the position where the adjacent two sides of the first layer of hexagons of the fuel assembly (400) with the enrichment degree of 17.5% coincide.
11. The lead bismuth fast spectrum reactor core arrangement of claim 10, wherein: the number of the fuel assemblies (500) with the enrichment degree of 15.5% is 18, all the fuel assemblies take one control rod assembly (200) as a center, the fuel assemblies are divided into two layers and are uniformly arranged in a hexagon shape, the number of the first layers is 6, and the number of the second layers is 12; the number of the fuel assemblies (400) with the enrichment degree of 17.5% is 36, the fuel assemblies are arranged at the periphery of the 18 fuel assemblies (500) with the enrichment degree of 15.5% in two layers in a hexagonal mode, the first layer is provided with 2 fuel assemblies (400) with the enrichment degree of 17.5% in total in the middle of each side, and a control rod assembly (200) is arranged at the overlapped position of each two adjacent sides in the first layer, so that 6 control rod assemblies (200) are arranged in the first layer in total; the second layer is uniformly provided with 24 fuel assemblies (400) with the enrichment degree of 17.5 percent; the number of the fuel assemblies (300) with the enrichment degree of 19.5% is 60, the fuel assemblies are arranged on the periphery of the fuel assembly (400) with the enrichment degree of 17.5% in two layers, wherein the number of the first layers is 30, and the number of the second layers is 5 and 30; a reflective layer assembly (100) is disposed at the overlapping position of each two adjacent sides of the second layer.
12. The lead bismuth fast spectrum reactor core arrangement of claim 9, wherein: arranging the lead-based fast reactor magnesium oxide reflecting layer assembly (100) at the periphery of a core active area; the core active area is internally provided with 54 hexagonal fuel assemblies which comprise 18 fuel assemblies (700) with 15% of enrichment degree and 36 fuel assemblies (600) with 19% of enrichment degree, which are uniformly arranged in two layers from inside to outside according to a section hexagon;
the number of the lead-based fast reactor magnesium oxide reflecting layer assemblies (100) is 68, and the lead-based fast reactor magnesium oxide reflecting layer assemblies are uniformly distributed on the periphery of a reactor core active area in two layers;
the number of the control rod assemblies (200) is 7, one of the control rod assemblies is arranged in the center of the core active area, and the other 6 control rod assemblies are arranged at the position where the adjacent two sides of the first layer of hexagons of the fuel assembly (600) with the enrichment degree of 19% coincide.
13. The lead bismuth fast spectrum reactor core arrangement of claim 9, wherein: the control rod assembly (200) comprises 37 control rod absorbers, and the control rod absorber is made of a material B4C。
14. The lead bismuth fast spectrum reactor core arrangement of claim 9, wherein: the thickness of the cladding 1 is 0.8mm, and the thickness of the component box 3 is 2 mm.
15. The lead bismuth fast spectrum reactor core arrangement of claim 9, wherein: the fuel assemblies each contained 169 cylindrical fuel element rods.
16. The lead bismuth fast spectrum reactor core arrangement of claim 15 wherein: the fuel material is UO2The diameter of the fuel element rod is 12mm, and the height of the active section is 900 mm.
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