CN106448750A - Embedded type double-process supercritical water reactor fuel assembly - Google Patents
Embedded type double-process supercritical water reactor fuel assembly Download PDFInfo
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- CN106448750A CN106448750A CN201611055658.8A CN201611055658A CN106448750A CN 106448750 A CN106448750 A CN 106448750A CN 201611055658 A CN201611055658 A CN 201611055658A CN 106448750 A CN106448750 A CN 106448750A
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- heat insulation
- insulation box
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
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- 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
- G21C3/322—Means to influence the coolant flow through or around the bundles
-
- 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)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention discloses an embedded type double-process supercritical water reactor fuel assembly, comprising fuel rods, a guide tube, an assembly box, a water rod box and a heat insulation box, wherein the assembly box and the heat insulation box respectively have a tubular structure, and the assembly box, the heat insulation box, the guide tube and the fuel rods are parallel to each other; the assembly box sleeves the outer side of the heat insulation box, and two ends of the assembly box are positioned between two ends of the heat insulation box; the fuel rods are arranged in the heat insulation box and a space between the outer wall of the heat insulation box and the inner wall of the assembly box, and the guide tube is arranged in the heat insulation box; the assembly box is also provided with a second process coolant outlet and a second process coolant inlet, and the second process coolant outlet and the second process coolant inlet are formed in the side wall of the assembly box; the water rod box is in the tubular structure arranged in the heat insulation box; the length direction of the water rod box is the same as that of the heat insulation box. The fuel assembly is simple in structure and can effectively improve the economy and safety during manufacture and use of the fuel assembly.
Description
Technical field
The present invention relates to being used for nuclear reactor structure technical field, more particularly to a kind of Embedded Double flow process supercritical water
Heap fuel assembly.
Background technology
Supercritical-Pressure Light Water Cooled Reactor (SCWR) is the most with prospects six kind nuclear energy that iv filters out for nuclear energy international symposium
One of system.SCWR nuclear power generating sets have the outstanding advantages such as the thermal efficiency is high, system simplifies.In order to solve SCWR moderation of neutrons not
Foot, the reactor core gateway temperature difference be big and the problems such as flow instability, introduces " water rod " design in the design of thermal-neutron spectrum assembly,
In Core Design, coolant employs multipaths mobility program, causes assembly and core structure design is extremely complex and manufacture is tired
Difficult.Additionally, there have been developed no the fast neutron spectrum supercritical water reactor fuel assembly of " water rod " and the cooling of matched double-flow
Agent mobility program.But supercritical water reactor coolant average density is low, the water density of no " water rod " fuel assembly design can be led to anti-
Answer property coefficient may be negative value, have a strong impact on reactor core inherent safety.For this reason, it may be necessary to introduce solid moderator material in assembly
Material, such as ZrH, graphite etc., bring extreme difficulties to the design of reactor core batch refuelling scheme.In addition, coolant flow scheme adopts
Double-flow designs, and reactor core top needs to arrange special cryogenic coolant and high temperature coolant flow dividing structure, also leads to
The structure design on reactor core top is extremely complex, installs to in-pile component and relevant device and brings larger difficulty.In ideal conditionss
Under, substantially meet safe design requirement, if considering manufacture deviation and actual motion, thermography/compose fuel assembly and Core Design soon
Concept feasible will face huge challenge.Therefore, it is highly desirable to rethink Supercritical-Pressure Light Water Cooled Reactor assembly and Core Design, real
The coordinating and unifying of existing economy, safety and engineering realizability.
Content of the invention
The invention provides a kind of Embedded Double flow process supercritical water reactor fuel assembly, this fuel assembly structure simply, can
Economy when effectively improving fuel assembly manufacture and using and safety.
For solving the above problems, a kind of Embedded Double flow process supercritical water reactor fuel assembly that the present invention provides is by following
Technical essential carrys out solve problem：A kind of Embedded Double flow process supercritical water reactor fuel assembly, including fuel rod and guide pipe, also wraps
Include assembly housing, water rod box and heat insulation box, described assembly housing and heat insulation box are tubular structure, and assembly housing, heat insulation box, guiding
Pipe, fuel rod are in parallel relation each other；
Described assembly housing is sheathed on the outside of heat insulation box, and the two ends of assembly housing are respectively positioned between the two ends of heat insulation box；
It is provided with fuel rod in space in described heat insulation box, between the outer wall of heat insulation box and assembly housing inwall, described
Guide pipe is arranged in heat insulation box；
Second procedure coolant outlet and second procedure coolant entrance, described second procedure are also set up on described assembly housing
Coolant outlet and second procedure coolant entrance are respectively positioned on the wall of assembly housing side；
Described water rod box is the tubular structure being arranged in heat insulation box, the length direction of water rod box and the length side of heat insulation box
Xiang Gongxiang.
Specifically, the space between the endoporus of above water rod box, assembly housing and heat insulation box, be in the endoporus of heat insulation box cold
But the circulation passage of agent；In this fuel assembly, the flow process of coolant is divided into two flow processs by heat insulation box：First-class in heat insulation box
Second procedure between journey, heat insulation box and assembly housing, is provided with fuel rod in first pass and second procedure：First pass
In first pass area fuel rod, the second procedure area fuel rod in second procedure；Heat insulation box is respectively positioned on to the two ends of assembly housing
Two ends between restriction, that is, the two ends of heat insulation box be respectively relative to the corresponding end evagination of assembly housing, so, the two ends of heat insulation box
In, one end is first pass coolant entrance, and the other end is first pass coolant outlet, and coolant is flowing through first pass area
When, the hollow region also circulation passage as first pass area of water rod box, so, the coolant in water rod box is excellent as water,
Play slowing down effect when fuel assembly works, the coolant beyond water rod box in first pass area, plays to first pass area
The cooling effect of fuel rod；In second procedure, second procedure coolant entrance the entering as second procedure coolant of setting
Mouthful, the coolant that second procedure coolant outlet flows out as the outlet of second procedure coolant, first pass coolant outlet
Entered in second procedure by second procedure coolant entrance.
Fuel assembly scheme provided above can replace supercritical water reactor reactor core double-flow flow design scheme, due to first
The coolant gateway of flow process is located at the end of heat insulation box, and the coolant gateway of second procedure is located at the side of assembly housing, with
When, guide pipe and water rod box are respectively positioned in first pass, therefore this programme is different from prior art, can cancel the height on reactor core top
Temperature and cryogenic coolant flow dividing structure, thus simplifying the design of pressure vessel in-pile component, reduce pressure vessel internals and phase
Close equipment safety difficulty；By the center of fuel assembly first pass arrange water rod box obtain water rod, using with first-class
Journey fuel rod identical coolant flow scheme, need not arrange independent coolant flow dividing structure, appropriateness can strengthen assembly neutron
Moderating power, it is ensured that water density has positive reactivity coefficient, cancels the solid moderator that fast neutron spectrum assembly is designed with；More than
Simple due to being passed through coolant implementation to the inside of it in fuel assembly, therefore can adopt in corresponding core loading design
Single-fuel kit form provided above, so, can significantly reduce reactor core batch refueling design technical difficulty.
To sum up：Embedded Double flow process supercritical water reactor fuel assembly proposed by the present invention, structure design is simple, physical Design
Difficulty is little, significantly improves fuel economy, safety and engineering feasibility.
Further, for lifted the cooling capacity to second procedure for the coolant, above second procedure coolant entrance and
Second procedure coolant outlet can be separately positioned on the different ends of assembly housing；For ease of realizing the separation of hot and cold coolant,
The gauge pipe of fuel assembly is also arranged in first pass.
Because reactor core includes many group fuel assemblies, it is easy to inject coolant in each flow process of each fuel assembly as one kind
Technical scheme, be preferably arranged to also include two pieces of dividing plates being connected with fuel assembly, one of dividing plate is arranged at first-class
Between journey coolant entrance and second procedure coolant outlet, second piece of dividing plate is arranged at second procedure coolant entrance and second
Between flow process coolant outlet, meanwhile, pressure vessel is divided into independent three layer by above two pieces of dividing plates, each in pressure vessel
One flow process coolant entrance is respectively positioned in one layer of the top, and in pressure vessel, each second procedure coolant outlet is respectively positioned on second
Layer in, in pressure vessel, each first pass coolant outlet and second procedure coolant entrance are respectively positioned in third layer, two pieces every
Can pass through on plate to arrange the connection that multiple through holes complete dividing plate and this fuel assembly on respective, and each dividing plate and fuel assembly
Junction point can be on the assembly housing of each fuel assembly in position or on heat insulation box.So, compared to the core internals of prior art, this knot
The structure of structure is simple, and design, assembling, maintenance difficulties are little, and in fuel assembly, injection coolant is very convenient, is remarkably improved heap
Economy, safety and engineering feasibility that core manufactures and runs.
Further technical scheme is：
For making to obtain the bigger water rod of volume in water rod box, reduce the flow of coolant in water rod box, with reality simultaneously
Under conditions of guarantee assembly water density reactivity coefficient is just now, that is, under conditions of realizing ensureing assembly moderation of neutrons ability,
The flow velocity of coolant, the heat transfer to first pass area fuel rod for the strengthening, described water rod in first pass beyond increase water rod box
In the two ends of box, the outer shape of at least one end is tapered, and the small end end face of water rod box tapering point end is the end face of water rod box.
In this structure, at least one end of water rod box will be set to size head, the small end of concentric reducer is located at the free end of water rod box, this
Sample, can obtain, at least one end of water rod box, the polycondensation mouth that a cross-sectional area reduces, that is, make the corresponding end tool of water rod box
There is poor fluid negotiability.Preferably the two ends of water rod box are all provided with being set to concentric reducer shape.
To the amount of coolant heat transfer in first pass, it is beneficial to coolant for reducing coolant in second procedure to fuel rod
Cooling capacity, the internal face of described heat insulation box and/or outside wall surface are additionally provided with thermal insulation layer.
To the amount of coolant heat transfer in first pass, it is beneficial to coolant for reducing coolant in second procedure to fuel rod
Cooling capacity, described heat insulation box is made up of heat-barrier material.
As a kind of way of realization be easy to and be installed on fuel assembly in pressure vessel, also include reactor core top grating and heap
Core lower grid plate, the lower end of described assembly housing is provided with tapered conical section, on described reactor core top grating and reactor core lower grid plate all
It is provided with through hole, the conical section of the lower end of described assembly housing embeds in the through hole of reactor core lower grid plate, and the upper end of described heat insulation box is worn
Cross the through hole on reactor core top grating, the upper end of assembly housing is contacted with the wall of reactor core top grating.Above reactor core top grating and reactor core
The position that lower grid plate is used for fuel assembly is fixed, and the reactor core upper sealing plate of assembly housing upper end can be used as the envelope of assembly housing upper end
Plate.
As those skilled in the art, the perforate size at components above box two ends may be configured as the heat insulation box with correspondence position
The two ends of heat insulation box are such as arranged to vertebral body shape, are used for housing second procedure area fuel between the two ends of heat insulation box by form fit
Rod.
Multiple through holes are provided with described reactor core top grating and reactor core lower grid plate, each through hole on reactor core top grating is respectively
For with the cooperation of the heat insulation box of different fuel assembly, each through hole on reactor core lower grid plate be respectively used to different fuel assembly on
Assembly housing coordinates；
Described second procedure coolant entrance is located on the downside of reactor core lower grid plate, and described first pass coolant outlet is located at heap
Between core top grating and reactor core lower grid plate.In this programme, described reactor core top grating and reactor core lower grid plate be equivalent to for above-mentioned every
Plate, so, the third layer chamber that coolant that each fuel assembly first pass is discharged can surround in reactor core lower grid plate and pressure vessel
Mix in body, then entered into by the second procedure coolant entrance on assembly housing on each fuel assembly complete in corresponding second procedure
The cooling of second procedure area fuel rod in pairs.
Because this fuel assembly is operated in hot environment, the shape for ease of part each in this fuel assembly keeps, institute
State assembly housing, heat insulation box, guide pipe, water rod box shape of cross section be centrosymmetric image.
It is easy to manufacture and install, is easy to control the technical scheme of position of centre of gravity, the centrage of described water rod box as a kind of
With the centerline collineation of heat insulation box, the centrage of described heat insulation box and the centerline collineation of assembly housing.Further, it is preferably provided with
Arrangement mode for fuel rod is also centrosymmetric, and axis of symmetry is the centrage of above water rod box.
The invention has the advantages that：
Fuel assembly scheme provided above can replace supercritical water reactor reactor core double-flow flow design scheme, due to first
The coolant gateway of flow process is located at the end of heat insulation box, and the coolant gateway of second procedure is located at the side of assembly housing, with
When, guide pipe and water rod box are respectively positioned in first pass, therefore this programme is different from prior art, can cancel the height on reactor core top
Temperature and cryogenic coolant flow dividing structure, thus simplifying the design of pressure vessel in-pile component, reduce pressure vessel internals and phase
Close equipment safety difficulty；By the center of fuel assembly first pass arrange water rod box obtain water rod, using with first-class
Journey fuel rod identical coolant flow scheme, need not arrange independent coolant flow dividing structure, appropriateness can strengthen assembly neutron
Moderating power, it is ensured that water density has positive reactivity coefficient, cancels the solid moderator that fast neutron spectrum assembly is designed with；More than
Simple due to being passed through coolant implementation to the inside of it in fuel assembly, therefore can adopt in corresponding core loading design
Single-fuel kit form provided above, so, can significantly reduce reactor core batch refueling design technical difficulty.
To sum up：Embedded Double flow process supercritical water reactor fuel assembly proposed by the present invention, structure design is simple, physical Design
Difficulty is little, significantly improves fuel economy, safety and engineering feasibility.
Brief description
Fig. 1 is a kind of cuing open of Embedded Double flow process one specific embodiment of supercritical water reactor fuel assembly of the present invention
Face figure, the section of this profile is cross section, and in this profile, assembly housing, heat insulation box, the cross section of water rod box are all in square
Shape；
Fig. 2 is a kind of cuing open of Embedded Double flow process one specific embodiment of supercritical water reactor fuel assembly of the present invention
Face figure, the section of this profile is cross section, and in this profile, assembly housing, heat insulation box, the cross section of water rod box are all in positive six sides
Shape；
Fig. 3 is a kind of knot of Embedded Double flow process one specific embodiment of supercritical water reactor fuel assembly of the present invention
Structure schematic diagram.
In figure labelling is respectively：1st, assembly housing, 2, second procedure area fuel rod, 3, heat insulation box, 4, guide pipe, 5, water rod
Box, 6, first pass area fuel rod, 7, first pass coolant entrance, 8, first pass coolant outlet, 9, second procedure cold
But agent entrance, 10, second procedure coolant outlet, 11, reactor core top grating, 12, reactor core lower grid plate.
Specific embodiment
With reference to embodiment, the present invention is described in further detail, but the present invention is not limited only to following enforcement
Example：
Embodiment 1：
As shown in Figure 1 to Figure 3, a kind of Embedded Double flow process supercritical water reactor fuel assembly, including fuel rod and guide pipe
4, also include assembly housing 1, water rod box 5 and heat insulation box 3, described assembly housing 1 and heat insulation box 3 are tubular structure, and assembly housing 1,
Heat insulation box 3, guide pipe 4, fuel rod are in parallel relation each other；
Described assembly housing 1 is sheathed on the outside of heat insulation box 3, and the two ends of assembly housing 1 are respectively positioned between the two ends of heat insulation box 3；
It is provided with fuel rod, institute in space in described heat insulation box 3, between the outer wall of heat insulation box 3 and assembly housing 1 inwall
State guide pipe 4 to be arranged in heat insulation box 3；
Second procedure coolant outlet 10 and second procedure coolant entrance 9 also set up on described assembly housing 1, described second
Flow process coolant outlet 10 and second procedure coolant entrance 9 are respectively positioned on assembly housing 1 side wall；
Described water rod box 5 is the tubular structure being arranged in heat insulation box 3, the length direction of water rod box 5 and the length of heat insulation box 3
Degree direction altogether to.
Specifically, the space between the endoporus of above water rod box 5, assembly housing 1 and heat insulation box 3, in the endoporus of heat insulation box 3 all
Circulation passage for coolant；In this fuel assembly, the flow process of coolant is divided into two flow processs by heat insulation box 3：In heat insulation box 3
Second procedure between first pass, heat insulation box 3 and assembly housing 1, is provided with fuel rod in first pass and second procedure：
Second procedure area fuel rod 2 in first pass area fuel rod 6 in first pass, second procedure；Equal to the two ends of assembly housing 1
Restriction between the two ends of heat insulation box 3, that is, the two ends of heat insulation box 3 be respectively relative to the corresponding end evagination of assembly housing 1, this
Sample, in the two ends of heat insulation box 3, one end is first pass coolant entrance 7, and the other end is first pass coolant outlet 8, cooling
Agent when flowing through first pass area, water rod box 5 the hollow region also circulation passage as first pass area, so, water rod box 5
In coolant as water rod, play slowing down effect when fuel assembly work, the cooling beyond the excellent box 5 of water in first pass area
Agent, plays the cooling effect to first pass area fuel rod 6；In second procedure, the second procedure coolant entrance 9 of setting is made
For the entrance of second procedure coolant, second procedure coolant outlet 10 is as the outlet of second procedure coolant, first pass
The coolant that coolant outlet 8 flows out is entered in second procedure by second procedure coolant entrance 9.
Fuel assembly scheme provided above can replace supercritical water reactor reactor core double-flow flow design scheme, due to first
The coolant gateway of flow process is located at the end of heat insulation box 3, and the coolant gateway of second procedure is located at the side of assembly housing 1,
Meanwhile, guide pipe 4 and water rod box 5 are respectively positioned in first pass, therefore this programme is different from prior art, can cancel reactor core top
High temperature and cryogenic coolant flow dividing structure, thus simplifying the design of pressure vessel in-pile component, reduce pressure vessel internals
And the safe difficulty of relevant device；Obtain water rod by arranging water rod box 5 in the center of fuel assembly first pass, using with the
One flow process fuel rod identical coolant flow scheme, need not arrange independent coolant flow dividing structure, appropriateness can strengthen assembly
Moderation of neutrons ability, it is ensured that water density has positive reactivity coefficient, cancels the solid moderator that fast neutron spectrum assembly is designed with；
Simple due to being passed through coolant implementation to the inside of it in above fuel assembly, therefore can in corresponding core loading design
Using single-fuel kit form provided above, so, reactor core batch refueling design technical difficulty can be significantly reduced.
To sum up：Embedded Double flow process supercritical water reactor fuel assembly proposed by the present invention, structure design is simple, physical Design
Difficulty is little, significantly improves fuel economy, safety and engineering feasibility.
Further, for lifting the cooling capacity to second procedure for the coolant, above second procedure coolant entrance 9 He
Second procedure coolant outlet 10 can be separately positioned on the different ends of assembly housing 1；For ease of realizing dividing of hot and cold coolant
From the gauge pipe of fuel assembly is also arranged in first pass.
Because reactor core includes many group fuel assemblies, it is easy to inject coolant in each flow process of each fuel assembly as one kind
Technical scheme, be preferably arranged to also include two pieces of dividing plates being connected with fuel assembly, one of dividing plate is arranged at first-class
Between journey coolant entrance 7 and second procedure coolant outlet 10, second piece of dividing plate be arranged at second procedure coolant entrance 9 with
Between second procedure coolant outlet 10, meanwhile, pressure vessel is divided into independent three layer, pressure vessel by above two pieces of dividing plates
In each first pass coolant entrance 7 be respectively positioned in one layer of the top, each second procedure coolant outlet 10 in pressure vessel
It is respectively positioned in the second layer, in pressure vessel, each first pass coolant outlet 8 and second procedure coolant entrance 9 are respectively positioned on the 3rd
In layer, two pieces of dividing plates can pass through arrange, on respective, the connection that multiple through holes complete dividing plate and this fuel assembly, and each dividing plate
Can be on the assembly housing 1 of each fuel assembly in position or on heat insulation box 3 with the junction point of fuel assembly.So, compared to prior art
Core internals, the structure of this structure is simple, and design, assembling, maintenance difficulties are little, and in fuel assembly, injection coolant is very square
Just, it is remarkably improved economy, safety and the engineering feasibility of reactor core manufacture and operation.
Embodiment 2：
The present embodiment is further qualified on the basis of embodiment 1, as shown in Figure 1 to Figure 3, for making in water rod box 5
In obtain volume bigger water rod, simultaneously reduce water rod box 5 in coolant flow, with realize ensure assembly water density reaction
Property coefficient be just under conditions of, that is, realize ensure assembly moderation of neutrons ability under conditions of, increase water rod box 5 beyond first-class
The flow velocity of coolant in journey, the heat transfer to first pass area fuel rod 6 for the strengthening, in the two ends of described water rod box 5, at least one end
Outer shape tapered, and water rod box 5 tapering point end small end end face be water rod box 5 end face.In this structure, will water rod box
5 at least one end is set to size head, and the small end of concentric reducer is located at the free end of water rod box 5, so, can be in water rod box 5
At least one end obtains the polycondensation mouth that a cross-sectional area reduces, that is, make the corresponding end of water rod box 5 have poor fluid stream
Logical ability.Preferably the two ends of water rod box 5 are all provided with being set to concentric reducer shape.
To the amount of coolant heat transfer in first pass, it is beneficial to coolant for reducing coolant in second procedure to fuel rod
Cooling capacity, the internal face of described heat insulation box 3 and/or outside wall surface are additionally provided with thermal insulation layer.
To the amount of coolant heat transfer in first pass, it is beneficial to coolant for reducing coolant in second procedure to fuel rod
Cooling capacity, alternatively, described heat insulation box 3 is made up of heat-barrier material.
As a kind of way of realization be easy to and be installed on fuel assembly in pressure vessel, also include reactor core top grating 11 and
Reactor core lower grid plate 12, the lower end of described assembly housing 1 is provided with tapered conical section, grid under described reactor core top grating 11 and reactor core
Through hole is provided with plate 12, the conical section of the lower end of described assembly housing 1 embeds in the through hole of reactor core lower grid plate 12, described heat-insulated
The upper end of box 3 passes through the through hole on reactor core top grating 11, and the upper end of assembly housing 1 is contacted with the wall of reactor core top grating 11.More than
Reactor core top grating 11 and the reactor core lower grid plate 12 i.e. position for fuel assembly are fixed, and the reactor core upper sealing plate of assembly housing 1 upper end is
Can be used as the shrouding of assembly housing 1 upper end.
As those skilled in the art, the perforate size at components above box 1 two ends may be configured as heat-insulated with correspondence position
The two ends of heat insulation box 3 are such as arranged to vertebral body shape, are used for housing second procedure area between the two ends of heat insulation box 3 by box 3 form fit
Fuel rod 2.
Multiple through holes are provided with described reactor core top grating 11 and reactor core lower grid plate 12, each logical on reactor core top grating 11
Hole is respectively used to coordinate with the heat insulation box 3 of different fuel assembly, and each through hole on reactor core lower grid plate 12 is respectively used to and different combustions
Assembly housing 1 on material assembly coordinates；
Described second procedure coolant entrance 9 is located on the downside of reactor core lower grid plate 12, described first pass coolant outlet 8
Between reactor core top grating 11 and reactor core lower grid plate 12.In this programme, described reactor core top grating 11 and reactor core lower grid plate 12 are suitable
In for above-mentioned dividing plate, so, the coolant that each fuel assembly first pass is discharged can be in reactor core lower grid plate 12 and pressure vessel
In the third layer cavity surrounding mix, then entered into by the second procedure coolant entrance 9 on assembly housing 1 on each fuel assembly right
The cooling to second procedure area fuel rod 2 is completed in the second procedure answered.
Embodiment 3：
The present embodiment on the basis of any one technical scheme that one embodiment of any of the above provides, this case is made into
One step limits：Because this fuel assembly is operated in hot environment, the shape for ease of part each in this fuel assembly keeps, institute
State assembly housing 1, heat insulation box 3, guide pipe 4, water rod box 5 shape of cross section be centrosymmetric image.
It is easy to manufacture and install, is easy to control the technical scheme of position of centre of gravity, the centrage of described water rod box 5 as a kind of
With the centerline collineation of heat insulation box 3, the centrage of described heat insulation box 3 and the centerline collineation of assembly housing 1.Further, preferably
The arrangement mode being set to fuel rod is also centrosymmetric, and axis of symmetry is the centrage of above water rod box 5.
Embodiment 4：
As Fig. 1 and Fig. 3, the present embodiment is on the basis of embodiment 2, there is provided a kind of concrete implementation scheme：This realization
Assembly housing 1 in mode, heat insulation box 3, water rod box 5 cross section all square, fuel rod outer diameter is 9.5mm, first pass area
14 × 14 grid arrangement pressed by fuel rod 6, and pitch is 10.5mm, and first pass arranges 12 guide pipes 4 and 112 fuel rods altogether.
Each guide pipe 4 accounts for 4 grid positions, and guide pipe 4 external diameter is 21.0mm, and wall thickness is 1.0mm.Water rod box 5 is located at first pass
Center, occupy 6 × 6 grid positions, water rod box 5 wall thickness is 0.5mm.20 × 20 grids pressed by second procedure area fuel rod 2
Arrangement, pitch is 10.7mm, arranges 204 fuel rods altogether.Assembly housing 1 wall thickness is 0.5mm, and heat insulation box 3 wall thickness is 1.4mm.
Fig. 3 gives axial cross-sectional views, and cryogenic coolant is from the first pass coolant entrance 7 on fuel assembly top
Enter assembly first pass, filling water rod box 5 and cooling first pass area fuel rod 6, and the first pass from assembly bottom is cold
But agent outlet 8 outflow.By reducing the circulation area of the water rod upper and lower port of box 5, reduce the coolant flow in water rod box 5,
Ensure assembly water density reactivity coefficient be just under conditions of, increase first pass coolant flow speed, augmentation of heat transfer.The present embodiment
In also include the reactor core top grating 11 for being layered and reactor core lower grid plate 12 to pressure vessel, all coolants pressure hold
After device lower chambers are fully mixed, enter second procedure from the second procedure coolant entrance 9 of assembly lower end side, cool down second
Journey area fuel rod 2, and flow out from the second procedure coolant outlet 10 of assembly upper side.
Embodiment 5：
As Fig. 2 and Fig. 3, the present embodiment is on the basis of embodiment 2, there is provided a kind of concrete implementation scheme：This realization
, all in regular hexagon, fuel rod outer diameter is 9.5mm, by triangle for assembly housing 1 in mode, heat insulation box 3, the cross section of water rod box 5
Grid arranges.It is provided with 117 fuel rods altogether, pitch is 10.5mm, 12 guide pipes 4, and each guide pipe 4 accounts in first pass
With 7 excellent grid positions.Guide pipe 4 external diameter is 22mm, and wall thickness is 1.0mm.Water rod is located at first pass center, occupies 61
Grid positions, water rod box 5 wall thickness is 0.5mm.Second procedure is provided with 276 fuel rods altogether, and pitch is 10.7mm.Assembly housing 1
Wall thickness is 0.5mm, and heat insulation box 3 wall thickness is 1.4mm.
Above content is the further description present invention made with reference to specific preferred implementation it is impossible to assert this
The specific embodiment of invention is confined to these explanations.For general technical staff of the technical field of the invention,
The other embodiment drawing under without departing from technical scheme, should be included in protection scope of the present invention.
Claims (8)
1. a kind of Embedded Double flow process supercritical water reactor fuel assembly, including fuel rod and guide pipe (4) it is characterised in that going back
Including assembly housing (1), water rod box (5) and heat insulation box (3), described assembly housing (1) and heat insulation box (3) are tubular structure, and group
Part box (1), heat insulation box (3), guide pipe (4), fuel rod are in parallel relation each other；
Described assembly housing (1) is sheathed on the outside of heat insulation box (3), the two ends of assembly housing (1) be respectively positioned on heat insulation box (3) two ends it
Between；
It is provided with fuel rod in space in described heat insulation box (3), between the outer wall of heat insulation box (3) and assembly housing (1) inwall,
Described guide pipe (4) is arranged in heat insulation box (3)；
Second procedure coolant outlet (10) and second procedure coolant entrance (9) also set up on described assembly housing (1), described
Two flow process coolant outlets (10) and second procedure coolant entrance (9) are respectively positioned on the wall of assembly housing (1) side；
Described water rod box (5) is the tubular structure being arranged in heat insulation box (3), the length direction of water rod box (5) and heat insulation box (3)
Length direction altogether to.
2. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 1 is it is characterised in that described water
In the two ends of excellent box (5), the outer shape of at least one end is tapered, and the small end end face of water rod box (5) tapering point end is water rod
The end face of box (5).
3. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 1 it is characterised in that described every
It is additionally provided with thermal insulation layer on the internal face of hot box (3) and/or outside wall surface.
4. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 1 it is characterised in that described every
Hot box (3) is made up of heat-barrier material.
5. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 1 is it is characterised in that also include
Reactor core top grating (11) and reactor core lower grid plate (12), the lower end of described assembly housing (1) is provided with tapered conical section, described heap
Through hole is provided with core top grating (11) and reactor core lower grid plate (12), the conical section of the lower end of described assembly housing (1) embeds heap
In the through hole of core lower grid plate (12), the upper end of described heat insulation box (3) passes through the through hole on reactor core top grating (11), assembly housing (1)
Upper end contact with the wall of reactor core top grating (11).
6. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 5 is it is characterised in that described heap
Multiple through holes are provided with core top grating (11) and reactor core lower grid plate (12), each through hole on reactor core top grating (11) is used respectively
In heat insulation box (3) cooperation with different fuel assembly, each through hole on reactor core lower grid plate (12) is respectively used to and different fuel group
Assembly housing (1) cooperation on part；
Described second procedure coolant entrance (9) is located on the downside of reactor core lower grid plate (12), described first pass coolant outlet (8)
Between reactor core top grating (11) and reactor core lower grid plate (12).
7. a kind of Embedded Double flow process supercritical water reactor fuel assembly as claimed in any of claims 1 to 6, it is special
Levy and be, described assembly housing (1), heat insulation box (3), guide pipe (4), the shape of cross section of water rod box (5) are centrosymmetry figure
Shape.
8. a kind of Embedded Double flow process supercritical water reactor fuel assembly according to claim 7 is it is characterised in that described water
The centrage of excellent box (5) and the centerline collineation of heat insulation box (3), the centrage of described heat insulation box (3) and the center of assembly housing (1)
Line is conllinear.
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| CN106448750B (en) | 2017-10-13 |
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