CN102117664A - Double-row hexagonal fuel assembly for supercritical water-cooled reactor - Google Patents

Double-row hexagonal fuel assembly for supercritical water-cooled reactor Download PDF

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CN102117664A
CN102117664A CN2010106052340A CN201010605234A CN102117664A CN 102117664 A CN102117664 A CN 102117664A CN 2010106052340 A CN2010106052340 A CN 2010106052340A CN 201010605234 A CN201010605234 A CN 201010605234A CN 102117664 A CN102117664 A CN 102117664A
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hexagon
assembly
moderator
fuel
passage
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CN102117664B (en
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王连杰
秦冬
李庆
于颖锐
夏榜样
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Nuclear Power Institute of China
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E30/30Nuclear fission reactors

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Abstract

The invention belongs to the technical field of nuclear reactor fuel assemblies, particularly relates to a double-row hexagonal fuel assembly for a supercritical water-cooled reactor, and aims at providing a fuel assembly with better uniform and full moderation capability and a local power peak value as low as possible. A plurality of hexagonal moderator channels are arranged inside a hexagonal assembly box of the fuel assembly; two layers of fuel rods are arranged between the adjacent hexagonal moderator channels; a central hexagonal moderator channel which has the same structure with the hexagonal assembly box and is scaled down is arranged in the center of the hexagonal assembly box; continuously and repeatedly arrayed hexagonal moderator channels are arranged on each side of the central hexagonal moderator channels; and a plurality of trapezoid moderator channels are arranged on the edges of the assembly. In the double-row hexagonal fuel assembly provided by the invention, the two layers of fuel rods are arranged between the adjacent hexagonal moderator channels, thus the defect that the single row of fuel rods has weak moderation capability to the fuel rods close to the assembly box is overcome and the moderation effect of the fuel rods at angular points of the moderator channels is improved.

Description

Be applied to the double hexagon fuel assembly of supercritical water cold dome
Technical field
The invention belongs to the fuel assembly for nuclear reactor technical field, be specifically related to a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome.
Background technology
Because the enthalpy that supercritical water is bigger rises and lower power density, the design of supercritical water cold dome (SCWR) assembly relates to strong physics thermal technology coupling.The neutron economy of assembly and structural complexity will directly influence the economy of SCWR reactor core, and the economy advantage of SCWR reactor core is mainly reflected in system thermal efficiency height and simplified equipment.In order to obtain higher coolant outlet temperature, and then improve system thermal efficiency, need flatten the distribute power in the assembly as far as possible, reduce local power peaking's factor.In order effectively to reduce local power peaking's factor, multiple fuel assembly conceptual design scheme was proposed once in the world.
At present, the fuel assembly type that is applied to the supercritical water cold dome that proposes in the world mainly is divided into hexagonal fuel assembly and square fuel assembly.The hexagonal fuel assembly scheme mainly contains the Dobashi assembly scheme (see figure 1) of Japanese supercritical water cold dome SCLWR use and the scheme (see figure 2) that calendar year 2001 Bittermann proposes, and is single fuel rod arrangement mode.The square fuel assembly scheme mainly contains single square fuel assembly (see figure 3) and double square fuel assembly (see figure 4).
In the Dobashi of single hexagon fuel assembly scheme, the fuel rod of assembly center and peripheral distributes more intensive than inferior limit part, the suffered slowing down of the fuel rod of dense distribution is weaker than equally distributed fuel rod, under the situation of same fuel enrichment, such layout must make local power peaking's factor of whole assembly higher.In order to address this problem, the fuel rod of the three kinds of fuel enrichments of having to adopt a component internal has increased the complexity that assembly and reactor core design.
There is the uneven problem of slowing down equally in Bittermann assembly scheme, even the fuel rod at six angle point places is changed into the stainless steel solid rod, and the factor F of local power peaking when assembly adopts 6% homogeneous enrichment fuel rod LAlso near 1.30.
For square assembly scheme, Fig. 3 has provided a kind of preferred arrangement mode of single square fuel assembly, has adopted the fuel rod of 2 kinds of enrichments in the assembly.Fig. 4 has provided the synoptic diagram of double square fuel assembly, adopts the fuel rod with a kind of enrichment in the assembly.The circumferential homogeneity of square water rod slowing down effect is relatively poor, and the suffered slowing down difference on effect of the fuel rod of diverse location is bigger around the water rod.Though double square assembly has overcome single square assembly near the more weak shortcoming of fuel rod slowing down of assembly housing, the slowing down of the fuel rod at water rod angle point place to be improved and not obvious, significantly distribute power difference still can appear.
In " arrangement analysis of overcritical water-water reactor fuel assembly " that " Nuclear Science And Engineering " 2009 the 1st phases deliver, several arrangement modes to overcritical water-water reactor fuel assembly have carried out simple analysis, the hexagon assembly scheme of wherein mentioning, but research is comparatively preliminary in the literary composition, and there are a lot of problems in the assembly of proposition.At first, use zircoium hydride slowing material and stainless steel neutron absorber in the assembly, increased the complexity of modular construction design, reduced the neutron economy of assembly; Secondly, the assembly scheme of wherein mentioning adopts thin fuel rod, and size of components and fuel loading amount are less, is unfavorable for that control rod drive mechanisms (CRD) is arranged and reactor fuel loads layout; In addition, scheme is not considered the structural behaviour and the thermal property of assembly in the literary composition, and the assembly housing wall thickness in the assembly, slowing down box ancient piece of jade, round, flat and with a hole in its centre thickness etc. does not possess the engineering realizability.Just to the simple contrast of various possible arrangement modes, do not form actual product and arrangement of components scheme in the literary composition.
Summary of the invention
The purpose of this invention is to provide a kind of have preferably evenly slowing down and abundant moderating power, the local power peaking's factor low double hexagon fuel assembly that is applied to the supercritical water cold dome of trying one's best.
Technical scheme of the present invention is:
A kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: be equipped with a plurality of hexagon moderator passages in hexagon assembly box inside, between adjacent hexagon moderator passage, arrange two-layer fuel rod.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: be equipped with at described hexagon assembly box center one with hexagon assembly box isostructure, scaled center hexagon moderator passage, the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopts a plurality of trapezoidal moderator passages.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: the place, empty water crack in described trapezoidal slowing down passage both sides arranges hollow or solid keeper.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: structured material, guide pipe, involucrum and box wall material in the described fuel assembly all adopt Inconel718 or stainless steel 310S.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: described hexagon moderator passage is got 0.8~1.8mm, and the box wall thickness of trapezoidal moderator passage is got 0.8~1.8mm, and the assembly housing wall thickness is got 1~2mm.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: be equipped with at described hexagon assembly box center one with hexagon assembly box quadrature, scaled center hexagon moderator passage, the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopts a plurality of triangle moderator passages.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: be equipped with at described hexagon assembly box center one with hexagon assembly box isostructure, scaled center hexagon moderator passage, the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopt the moderator passage of a plurality of trapezoidal or rhombuses.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: the hexagon moderator port number in described hexagon assembly box is 13, each edge of described assembly is provided with a trapezoidal moderator passage.
Aforesaid a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, wherein: the hexagon moderator port number in described hexagon assembly box is a nineteen, each edge of described assembly is provided with two trapezoidal moderator passages.
The invention has the beneficial effects as follows:
1. the present invention proposes the assembly notion of between adjacent hexagons moderator passage, arranging two-layer fuel rod, both overcome single fuel rod arrangement to the more weak shortcoming of fuel rod slowing down, effectively improved the slowing down effect of moderator passage angle point place fuel rod again near assembly housing;
2. near place, the empty water crack the trapezoidal slowing down passage has arranged the structured material keeper in assembly, keeper can squeeze away place, sky water crack portion cooling agent on the one hand, reduction is near the moderating power of the fuel rod water crack, keeper intercept neutrons ability is stronger on the other hand, so keeper can effectively suppress near the power density of the fuel rod in empty water crack, flatten the assembly internal power and distribute;
3. the present invention has improved even slowing down of assembly and abundant moderating power by increasing trapezoidal grid or triangular lattice in hexagon assembly box wall inside edge;
4. consider engineerings application correlative factors such as assembly centre distance, uranium loading amount in the fuel assembly design, proposed to be applicable to four kinds of assembly schemes of thin fuel rod and thick fuel rod respectively;
5. structural behaviour and the thermal property of the present invention by taking all factors into consideration assembly chosen suitable hexagon moderator box wall thickness, assembly housing wall thickness and structured material;
6. by the layout in assembly, local power peaking's factor can be reduced to below 1.10 at thin rod and thick rod.
Description of drawings
Fig. 1 is a Dobashi assembly scheme synoptic diagram in the prior art;
Fig. 2 is a Bittermann assembly scheme synoptic diagram in the prior art;
Fig. 3 is single square assembly scheme arrangement figure (1/4 assembly) in the prior art;
Fig. 4 is a double square assembly scheme synoptic diagram in the prior art;
Fig. 5 is a kind of first embodiment synoptic diagram that is applied to the double hexagon fuel assembly of supercritical water cold dome provided by the invention;
Fig. 6 is a kind of double hexagon assembly of second embodiment synoptic diagram that is applied to the double hexagon fuel assembly of supercritical water cold dome provided by the invention;
Fig. 7 is a kind of double hexagon assembly of the 3rd embodiment synoptic diagram that is applied to the double hexagon fuel assembly of supercritical water cold dome provided by the invention;
Fig. 8 is a kind of double hexagon assembly of the 4th embodiment synoptic diagram that is applied to the double hexagon fuel assembly of supercritical water cold dome provided by the invention;
Among the figure, 1 keeper; 2 assembly housings; 3 fuel rods; 4 trapezoidal moderator passages; 5 hexagon moderator passages; 6 center gauge pipes; 7 control rod guide pipes; 8. slowing down water rod.
Embodiment
Below in conjunction with accompanying drawing and embodiment a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome that the present invention proposes is further introduced:
Fuel rod 3 can be divided into thin rod and thick rod, and usually thin rod refers to the fuel rod of diameter D less than 9.5mm; Thick rod is often referred to the fuel rod of diameter D more than or equal to 9.5mm.
Embodiment 1:
As shown in Figure 5, a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, the a plurality of hexagon moderator passages 5 of its inner employing, the edge adopts a plurality of trapezoidal moderator passages 4, between adjacent hexagons moderator passage 5, arrange two-layer fuel rod 3, arrange keeper 1 at the place, empty water crack of described trapezoidal slowing down passage 4 both sides; Structured material, guide pipe, involucrum and box wall material in the assembly all adopt Inconel718 or stainless steel 310S; Hexagon moderator passage 5 box walls and the desirable 0.8~1.8mm of trapezoidal moderator passage 4 box wall thickness, the assembly housing wall thickness is got 1~2mm; More excellent, hexagon moderator passage 5 box walls and trapezoidal moderator passage 4 box wall thickness are all got 0.8mm in the present embodiment, and the assembly housing wall thickness is got 1mm.
The diameter of described fuel rod 3 is D=10.2mm, and the P/D of assembly (pitch rod footpath than) is 1.3, and the hexagonal outer opposite side distance 238.8mm of hexagon fuel assembly xsect has 186 fuel rods in single case assembly, uranium dioxide loading amount 486kg.
The center of hexagon fuel assembly is provided with and assembly isostructure, scaled center hexagon moderator passage, and its opposite side distance is 32.42mm; The hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, adjacent hexagons moderator channel center distance is 59.2mm; Be provided with a trapezoidal moderator passage at the center on each limit of hexagon fuel assembly, this trapezoidal moderator passage is half of hexagon moderator passage.
The hexagon moderator passage 5 that is positioned in the middle of the hexagon fuel assembly is a center gauge pipe 6, in six moderator passages adjacent with center hexagon moderator passage 5 control rod guide pipe 7 can be set.
The assembly slowing down that this embodiment provides is comparatively even, not with the factor F of local power peaking of assembly under keeper 1 and control rod guide pipe 7 situations LBe 1.098.When adopting solid keeper 1, assembly has, the F during no control rod guide pipe LBe respectively 1.049 and 1.048, all be lower than 1.10 desired value.The described factor F of local power peaking LFor: maximum fuel rod power density is divided by the average power density of fuel rod in the assembly.
Embodiment 2:
As shown in Figure 6, a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, the a plurality of hexagon moderator passages 5 of its inner employing, the edge adopts a plurality of trapezoidal moderator passages 4, arrange two-layer fuel rod 3 between adjacent hexagons moderator passage 5, near the place, empty water crack described trapezoidal slowing down passage 4 arranges keeper 1; Structured material, guide pipe, involucrum and box wall material in the assembly all adopt Inconel718 or stainless steel 310S; Hexagon moderator passage 5 box walls and the desirable 0.8~1.8mm of trapezoidal moderator passage 4 box wall thickness, the assembly housing wall thickness is got 1~2mm; More excellent, hexagon moderator passage 5 box walls and trapezoidal moderator passage 4 box wall thickness are all got 0.8mm in the present embodiment, and the assembly housing wall thickness is got 1mm.
The diameter of described fuel rod 3 is D=8.0mm, and the P/D of assembly (pitch rod footpath than) is 1.3, and the hexagonal outer opposite side distance 234.1mm of hexagon fuel assembly xsect has 288 fuel rods in single case assembly, uranium dioxide loading amount 464kg.
The center of hexagon fuel assembly is provided with and assembly isostructure, scaled center hexagon moderator passage, and its opposite side distance is 25.63mm; The hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, adjacent hexagons moderator channel center distance is 46.42mm; Be provided with two trapezoidal moderator passages on each limit of hexagon fuel assembly, this trapezoidal moderator passage is half of hexagon moderator passage.
Be positioned at hexagon fuel assembly middle hexagon moderator passage 5 and be center gauge pipe 6, in 12 moderator passages around the center hexagon moderator passage 5 control rod guide pipe 7 can be set.
Embodiment 3:
As shown in Figure 7, a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, the a plurality of hexagon moderator passages 5 of its inner employing, the edge adopts a plurality of trapezoidal moderator passages 4, arrange two-layer fuel rod 3 between adjacent hexagons moderator passage 5, near the place, empty water crack described trapezoidal slowing down passage 4 arranges keeper 1; Structured material, guide pipe, involucrum and box wall material in the assembly all adopt Inconel718 or stainless steel 310S; Hexagon moderator passage 5 box walls and the desirable 0.8~1.8mm of trapezoidal moderator passage 4 box wall thickness, the assembly housing wall thickness is got 1~2mm; More excellent, hexagon moderator passage 5 box walls and trapezoidal moderator passage 4 box wall thickness are all got 0.8mm in the present embodiment, and the assembly housing wall thickness is got 1mm.
The diameter of described fuel rod 3 is D=8.0mm, and the P/D of assembly (pitch rod footpath than) is 1.3, and the hexagonal outer opposite side distance 295mm of hexagon fuel assembly xsect has 444 fuel rods in single case assembly, uranium dioxide loading amount 715kg.
The center of hexagon fuel assembly is provided with and assembly quadrature, scaled center hexagon moderator passage, and its opposite side distance is 25.63mm; The hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, adjacent hexagons moderator channel center distance is 46.42mm; Be provided with a plurality of triangle moderator passages on each limit of hexagon fuel assembly.
Embodiment 4:
As shown in Figure 8, a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome, the a plurality of hexagon moderator passages 5 of its inner employing, the edge adopts a plurality of trapezoidal moderator passages 4, arrange two-layer fuel rod 3 between adjacent hexagons moderator passage 5, near the place, empty water crack described trapezoidal slowing down passage 4 arranges keeper 1; Structured material, guide pipe, involucrum and box wall material in the assembly all adopt Inconel718 or stainless steel 310S; Hexagon moderator passage 5 box walls and the desirable 0.8~1.8mm of trapezoidal moderator passage 4 box wall thickness, the assembly housing wall thickness is got 1~2mm; More excellent, hexagon moderator passage 5 box walls and trapezoidal moderator passage 4 box wall thickness are all got 0.8mm in the present embodiment, and the assembly housing wall thickness is got 1mm.
The diameter of described fuel rod 3 is D=8.0mm, and the P/D of assembly (pitch rod footpath than) is 1.3, and the hexagonal outer opposite side distance 279mm of hexagon fuel assembly xsect has 420 fuel rods in single case assembly, uranium dioxide loading amount 677kg.
The center of hexagon fuel assembly is provided with and assembly isostructure, scaled center hexagon moderator passage, and its opposite side distance is 25.63mm; The hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, adjacent hexagons moderator channel center distance is 46.42mm; Be provided with the moderator passage of a plurality of trapezoidal or rhombuses on each limit of hexagon fuel assembly.
The opposite side distance of embodiment 3 and embodiment 4 assemblies is bigger, help control rod drive mechanisms (CRD) layout and reactor core and arrange, but the kind and the number of special-shaped grid is more in the assembly, are unfavorable for the realization of modular construction.
Special-shaped grid kind and the number of embodiment 1 and embodiment 2 are less, help the realization of modular construction.
Table 1 has provided the embodiment 1 under different guide pipes, keeper and the trapezoidal moderator box wall thickness and the physical property result of calculation of embodiment 2 assembly schemes.By table 1 as seen, for not with embodiment 2 assemblies of keeper and guide pipe, have 2 adjacent empty water cracks at 6 drift angle places of assembly, cooling medium is more, and comparatively abundant to the fuel rod slowing down near corner point, its power density is higher, causes the F of assembly LBig (1.171).And the fuel rod slowing down of other positions is even in the assembly, and the power nonuniformity coefficient is lower than 1.05 substantially.
Power density near the fuel rod empty water of the effective inhibition crack flattens the assembly internal power and distributes, and can consider at the hollow or solid keeper of place, empty water crack layout.Keeper has squeezed away place, empty water crack portion cooling agent on the one hand, and keeper intercept neutrons ability is stronger on the other hand, so keeper can effectively suppress near the power density of the fuel rod in empty water crack.If be not limited to use, can consider to reduce near the enrichment of the fuel rod in empty water crack, but can not embody the advantage that double hexagon assembly fuel rod type is simplified like this with a kind of enrichment fuel.
Calculating shows that place, empty water crack adopts solid keeper can make the F of no control rod guide pipe assembly LReduce to 1.061, the F under the corresponding tape guide pipe assembly situation LBe 1.105.If desire to make assembly have, F under the no guide pipe situation LAll be lower than 1.10, then can increase the wall thickness of trapezoidal moderator box, if trapezoidal moderator box wall thickness increases to 1.8mm, assembly has, the F during no guide pipe LCan reduce to 1.043 and 1.051 respectively.
The double hexagon assembly of table 1 scheme physical property
Figure BDA0000040376670000091

Claims (9)

1. double hexagon fuel assembly that is applied to the supercritical water cold dome, it is characterized in that: be equipped with a plurality of hexagon moderator passages (5) in hexagon assembly box (2) inside, between adjacent hexagon moderator passage (5), arrange two-layer fuel rod (3).
2. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 1, it is characterized in that: be equipped with at described hexagon assembly box (2) center one with hexagon assembly box (2) isostructure, scaled center hexagon moderator passage (5), the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopts a plurality of trapezoidal moderator passages (4).
3. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 1 or 2 is characterized in that: the place, empty water crack in described trapezoidal slowing down passage (4) both sides arranges hollow or solid keeper (1).
4. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 1 is characterized in that: structured material, guide pipe, involucrum and box wall material in the described fuel assembly all adopt Inconel718 or stainless steel 310S.
5. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 2, it is characterized in that: described hexagon moderator passage (5) is got 0.8~1.8mm, the box wall thickness of trapezoidal moderator passage (4) is got 0.8~1.8mm, and assembly housing (2) wall thickness is got 1~2mm.
6. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 1, it is characterized in that: be equipped with at described hexagon assembly box (2) center one with hexagon assembly box (2) quadrature, scaled center hexagon moderator passage (5), the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopts a plurality of triangle moderator passages.
7. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 1, it is characterized in that: be equipped with at described hexagon assembly box (2) center one with hexagon assembly box (2) isostructure, scaled center hexagon moderator passage (5), the hexagon moderator passage that each limit of described center hexagon moderator passage has continuous repeated arrangement, described assembly edge adopt the moderator passage of a plurality of trapezoidal or rhombuses.
8. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 2, it is characterized in that: hexagon moderator passage (5) number in described hexagon assembly box (2) is 13, and each edge of described assembly is provided with a trapezoidal moderator passage (4).
9. a kind of double hexagon fuel assembly that is applied to the supercritical water cold dome as claimed in claim 2, it is characterized in that: hexagon moderator passage (5) number in described hexagon assembly box (2) is nineteen, and each edge of described assembly is provided with two trapezoidal moderator passages (4).
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