瑞典专利SE1350236A1 Nuclear fuel bundle containing thorium and nuclear reactor comprising the same

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专利摘要:
The fuel bundles for a nuclear reactor are described, which in some embodiments include a first fuel element that includes thorium dioxide; a second fuel element including uranium having a first fissile content; and a third fuel element that includes uranium having a second fissile content different from the first fissile content. Nuclear reactors using such fuel bundles are also described, including pressurized heavy water nuclear reactors. The uranium that has the various fissile contents may include combinations of natural uranium, depleted uranium, recycled uranium, lightly enriched uranium, and low enriched uranium.
公开号:SE1350236A1
申请号:SE1350236
申请日:2010-09-03
公开日:2013-03-27
发明作者:Mustapha Boubcher；Sermet Kuran；Cathy Cottrell；Robert R Bodner；Holly Bruce Hamilton；Bronwyn H Hyland；Benoit Arsenault
申请人:Ca Atomic Energy Ltd；
IPC主号:

专利说明:

elements that include uranium with a second fissile content that is different from the first fissile content.
In addition, certain embodiments of the present invention provide a nuclear reactor having at least one fuel bundle with a first fuel element that includes thorium dioxide; a second fuel element including uranium having a first fissile content; and a third fuel element that includes uranium having a second fissile content different from the first fissile content.
In some embodiments, any of the fuel bundles and processes just described may be used in a pressurized heavy water reactor, such as the fuel bundles with a first fuel element that includes thorium dioxide; a second fuel element including uranium having a first fissile content; and a third fuel element including uranium having a second fissile content different from the first fissile content, the fuel bundles being located within one or more tubes of pressurized water flowing past the fuel bundles, absorbing heat from the fuel bundles and performing work downstream in relation to the fuel bundles.
Other aspects of the present invention will become apparent upon consideration of the detailed description and accompanying drawings.
BRIEF DESCRIPTION OF THE RULES Fig. 1 is a cross-sectional view of a first embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 2 is a cross-sectional view of a second embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 3 is a cross-sectional view of a third embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 4 is a cross-sectional view of a fourth embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 5 is a cross-sectional view of a fifth embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 6 is a cross-sectional view of a sixth embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 7 is a cross-sectional view of a seventh embodiment of a nuclear fuel bundle in accordance with the invention.
Fig. 8 is a schematic diagram of a nuclear reactor using any of the fuel bundles of Figs. 1-7.
DETAILED DESCRIPTION Before describing in detail any of the embodiments of the present invention, it should be understood that the invention is not limited in application to the details of the embodiments and arrangement of components as described in the following description or illustrated in the accompanying drawings.
The invention may exist in other embodiments and may be used or practiced in a variety of ways.
Figures 1-7 illustrate various embodiments of a nuclear fuel bundle for use in a nuclear reactor, such as a pressurized heavy water reactor 10 (e.g., a Canadian reactor of the type Canadian Deuterium Uranium (CANDU)), a portion of which is shown schematically in Figure 8. of various embodiments of the present invention are provided in the context of a pressurized heavy water reactor having pressurized horizontal pipes within which the fuel bundles 14 are arranged. This nuclear reactor environment and the application of the fuel bundles of the present invention are presented by way of example only, and it is obvious that the present invention can be applied in the context of fuel bundles adapted for use in other types of nuclear reactors.
Referring to Fig. 8, the reactor core of the pressurized heavy water reactor 10 contains one or more fuel bundles 14. If the reactor 10 includes a plurality of fuel bundles 14, the bundles 14 may be placed from one side to the other inside a pressure pipe 18. In other types of reactors, the fuel bundles 14 can be arranged in other desirable ways. Each fuel bundle 14 contains a set of fuel elements 22 (sometimes referred to as "rods"), each containing a nuclear fuel and / or other elements or chemicals (eg a combustible poison), which will be described in more detail below in connection with Figs. 1-7. When the reactor 10 is in operation, a heavy water coolant 26 flows over the fuel bundles 14 to cool the fuel elements and remove heat from the fissile process. The coolant 26 can also transfer the heat to a steam generator 30 which drives a first tubular element, such as a turbine 34, to generate electrical energy.
Canadian Patent Application No. No. 2,174,983, filed April 25, 1996, discloses other fuel bundles for a nuclear reactor used in a manner similar to the fuel bundles 14 of the present invention, in the ways described and illustrated herein. The contents of Canadian Patent Application 2,174,983 are incorporated herein by reference.
Figs. 1-7 illustrate cross-sectional views of various embodiments of the fuel bundle 14 located in the pressure pipes 18. The heavy water coolant 26 is located inside the pressure pipe 18 and fills sub-channels between the fuel elements 22. The fuel elements may include a central element 38, a first plurality of elements 42 which are placed radially outwardly from the central member 38, a second plurality of members 46 are located radially outwardly from the first plurality of members 42, and a third plurality of members 50 are located radially outwardly from the second plurality of members 46. It should be apparent that in other embodiments For example, the fuel bundle may include fewer or more elements, and may include elements in configurations different from those illustrated in Figs. 1-7. For example, the fuel elements 22 can be placed parallel to each other in one or more planes, elements arranged in a matrix or so-called array with a square or any other shape, and elements in any other pattern or patternless configuration. The pressure pipe 18, the fuel bundle 14 and / or the fuel elements 22 can also be configured in different shapes and sizes. For example, the pressure pipes 18, the fuel bundles 14, and the fuel elements 22 may have any cross-sectional shape (except for the round shapes already shown in Figs. 1-7) and in desired sizes. As another example, the pressure pipes 18 and the fuel bundles 14 may have any different relative sizes (except for the similar sizes or two different versions of the pressure pipes 18 and the fuel elements 22 shown in Figs. 1-7).
In each of the embodiments in Figs. 1-6, a 43-element fuel bundle 14 is illustrated. The first plurality of elements 42 include seven elements arranged in parallel with each other in a substantially circular pattern. The second plurality of elements 46 include fourteen elements arranged in parallel with each other in a substantially circular pattern. The third plurality of elements 50 include twenty-one elements arranged in parallel with each other in a substantially circular pattern. The central element 38, the first plurality of elements 42, the second plurality of elements 46 and the third plurality of elements 50 are arranged concentrically so that all the elements 22 are parallel to each other. The central member 38 and each of the first plurality of members 42 have a first cross-sectional size (or diameter, in the case of round cross-sectional elements), and each of the second plurality 46 and the third plurality of 50 members having a second cross-sectional size (or diameter, in the case of elements with a round cross-sectional shape) that differs from the first cross-sectional size. In particular, the first cross-sectional size is larger than the second cross-sectional size. In this regard, the term "cross-sectional shape" refers to the cross-sectional shape generated by a plane passing through the body referred to in an orientation perpendicular to the longitudinal axis of the body. It should also be apparent that the lines included in Figs. 1-6 indicate a substantially circular position of the elements 22 for illustration only and do not necessarily indicate that the elements are bonded together or otherwise connected in a particular arrangement.
The embodiment of Fig. 7 illustrates a 37-element fuel bundle 14 in which all fuel elements 22 have a uniform cross-sectional size (or diameter, in the case of elements with a round cross-sectional shape). The plurality of elements 42 include six elements arranged in parallel with each other in a substantially circular pattern. The second plurality of elements 46 include twelve elements arranged in parallel with each other in a substantially circular pattern. The third plurality of elements 50 include eighteen elements arranged in parallel with each other in a substantially circular pattern. The central element 38, the first plurality of elements 42, the second plurality of elements 46, and the third plurality of elements 50 are arranged concentrically so that all the elements 22 are parallel to each other. It should be apparent that the lines included in Fig. 7 indicate a substantially circular position of the elements 22 for illustration only and do not necessarily indicate that the elements are tied together or otherwise connected in a particular arrangement.
In some embodiments, each of the fuel elements 22 includes a tube filled with nuclear fuel. The tube may be made of or include zirconium, a zirconium alloy, or other suitable material or a combination of materials which in some cases are characterized by low neutron absorption. The pipe can be filled with one or more materials, such as nuclear fuel alone or in combination with other materials. The material or materials may be in pellet form, powder form, or in any other suitable form or combination of forms. In other embodiments, the fuel elements 22 include a rod formed of one or more materials (e.g., nuclear fuel alone or in combination with other materials), such as nuclear fuel contained within a matrix of another material. In still other embodiments, the fuel elements 22 may include a combination of tubes and rods and / or other configurations, and the fuel elements 22 may be in other configurations suitable for the particular application.
As shown in Figs. 1-7, the fuel elements 22 may include various combinations of nuclear fuels, such as thorium dioxide (ThOg), depleted uranium (DU), natural uranium (NU), recycled uranium ( recycled uranium (RU), slightly enriched uranium (SEU) and low enriched uranium (LEU), which will be described in more detail below. As used herein and in the appended claims, the "percentage" of constituent components of materials included in the fuel bundle 14, fuel element 22 or other features is a reference by weight, unless otherwise specified. As defined herein, DU has a cleavable content of approximately 0.2% to approximately 0.5% by weight of 235U (including approximately 0.2% by weight and approximately 0.5% by weight), NOW has a cleavable content. content of approximately 0.71 vil approximately 1.2 vii approximately 1.2% by weight), SEU has a cleavable content of approximately 0.9 vil and approximately 3 wt% / a), and LEU has a cleavable content of approximately 3% to about 20% by weight of 235U (including approximately 3% by weight and approximately 20% by weight).
In the embodiment of Fig. 1, the central element 38 includes thorium dioxide and / or a burnable poison (BP), such as gadolinium or dysprosium. In some embodiments, 0-10% by volume of BP is used.
In other embodiments, 0-7 vol% BP is used. In other embodiments, 0-6 vol% BP is used. In still other embodiments, 0-3 vol% BP is used. The first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include LEUs having a first cleavable content (LEU1), and each of the third plurality of elements 50 includes LEUs having a second cleavable content (LEU2) different from the first cleavable content. It should be apparent that the cleavable content of the second plurality of elements 46 (LEU1) is selected from a range defined above, and that the cleavable content of the third plurality of elements 50 (LEU2) is also selected from the same range as defined, but differs from the cleavable content selected for the second plurality of elements 46. For example, LEU1 may have a cleavable content of approximately 4 wt.% of su and LEU2 may have a cleavable content of approximately 4.5% by weight of 235U. In certain embodiments of Fig. 1, a BP may be included in any of the fuel elements 22 illustrated in Fig. 1.
In addition, any of the amounts of BP just described may be included in any or all of the fuel elements of each of the embodiments of the fuel bundles described and / or illustrated herein.
In other embodiments, one of the outer two plurality of elements (ie, either the second plurality of elements 46 or the third plurality of elements 50) may include DU, NU, RU or SEU, instead of LEU, with a second cleavable content different from the fissile content of the LEU in the other of the outer two plurality of elements. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. In other embodiments, however, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
In the embodiment of Fig. 2, the central element 38 includes thorium dioxide and / or a combustible poison (BP), such as gadolinium or dysprosium. In some embodiments, 0-10% by volume of BP is used. In other embodiments, 0-7 vol% BP is used. In other embodiments, 0-6 vol% BP is used. In still other embodiments, 0-3 vol% BP is used. The first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include a first cleavable content of a mixture (commonly referred to herein by "/") of RU and SEU (RU / SEU) 1, which are mixed using any method known in the art. such as but not limited to the use of an acidic solution or dry mixture. The third plurality of elements 50 include a second mixture of RU and SEU (RU / SEUZ) having a second fissile content different from the first fissile content.
It should be apparent that the cleavable content of the second number element 46 (RU / SEU1) is selected from a range between and including approximately 0.72% by weight to approximately 3% by weight of 235U. The cleavable content of the third plurality of elements 50 (RU / SEUZ) is also selected from the same range, but differs from the cleavable contents selected for the second plurality of elements 46. In certain embodiments of Fig. 2, a BP may be included in which any of the fuel elements 22. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. However, the fissile content in other embodiments increases an outward radial direction from the center of the fuel bundle 14. It should also be noted in general, that RU is not limited to mixing with SEU. In other embodiments, RU may be mixed with LEU or highly enriched uranium (HEU) to result in an average fissile content at a desired level.
In the embodiment of Fig. 3, the central element 38 includes thorium dioxide and the first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include RUs having a first cleavable content (RU1), and the third plurality of elements 50 include RUs having a second cleavable content (RUZ) different from the first cleavable contents. It should be apparent that the cleavable content of the second plurality of elements 46 (RU1) is selected from the range defined above, and that the cleavable content of the third plurality of elements 50 (RU2) is also selected from the range defined above, but differs from the fissile content selected for the second plurality of elements 46. In some embodiments of Fig. 3, a BP may be included in any of the fuel elements 22. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle. In other embodiments, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
In the embodiment of Fig. 4, the central element 38 includes thorium dioxide and the first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include a mixture of RU and DU and / or include SEU, and have a first fissile content. If a mixture of RU and DU is used, the materials are mixed using a method known in the art, such as but not limited to using an acidic solution or dry mix. The third number element 50 includes a mixture of RU and DU and / or includes SEU, and has a second cleavable content (RU / DU and / or SEUZ). It should be apparent that the cleavable content of the second plurality of elements 46 is selected from a range between and including approximately 0.2% to about 3% by weight of 235U. The fissile content of the third plurality of elements 50 is also selected from the same range, but differs from the fissile content selected for the second plurality of elements 46. In some embodiments of Fig. 4, a BP may be included in any of the fuel elements 22. In other embodiments, the second plurality of elements 46 each include RU, DU, or SEU within the corresponding range of cleavable content, and similarly, the third plurality of elements 50 include each RU, DU, or SEU within the corresponding range of cleavable content, where the first cleavable content differs from the second cleavable content. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. In other embodiments, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
In the embodiment of Fig. 5, the central element 38 includes a mixture of thorium dioxide and BP (ThOg / BP) or a mixture of DU and BP (DU / BP). In some embodiments, 0-10% by volume of BP is used. In other embodiments, 0-7 vol% BP is used. In other embodiments, 0-6 vol% BP is used. In still other embodiments, 0-3 vol% BP is used. The first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include a mixture of RU and DU and / or include SEU, and have a first cleavable content (RU / DU and / or SEU1). If a mixture of RU and DU is used, the materials are mixed using a method known in the art, such as but not limited to the use of an acidic solution or dry mixture. The third plurality of elements 50 include a mixture of RU and DU and / or include SEU, and have a second cleavable content different from the first cleavable content (RU / DU and / or SEU2). It should be apparent that the cleavable content of the second plurality of elements 46 (RU / DU and / or SEU1) is selected from a range between and including approximately 0.2 vi | the cleavable content of the third plurality of elements 50 (RU / DU and / or SEUZ) is also selected from the same range, but differs from the cleavable content selected for the second plurality of elements 46. In some embodiments of Fig. 5, a BP similarly, in some embodiments, the second plurality of elements 46 may each include RU, DU, or SEU within corresponding ranges of fissile content, and similarly, the third plurality of elements 50 may each include RU, DU or SEU within the corresponding cleavable content range, where the first cleavable content differs from the second cleavable content. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. In other embodiments, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
In the embodiment of Fig. 6, the central element 38 includes either a mixture of thorium dioxide and BP (ThOg / BP) or thorium dioxide. In some embodiments, 0-10% by volume of BP is used. In other embodiments, 0-7 vol% BP is used. In other embodiments, 0-6 vol% BP is used. In still other embodiments, 0-3 vol% BP is used. The first plurality of elements 42 include thorium dioxide. The second plurality of elements 46 include a mixture of RU and DU and / or include SEU, and have a first cleavable content (RU / DU and / or SEU1). If a mixture of RU and DU is used, the materials are mixed using a method known in the art, such as but not limited to the use of an acidic solution or dry mixture. The third plurality of elements 50 include a mixture of RU and DU and / or include SEU, and have a second cleavable content different from the first cleavable content (RU / DU and / or SEUZ). It should be apparent that the cleavable content of the second plurality of elements 46 (RU / DU and / or SEU1) is selected from a range between and including approximately 0.2% by weight to approximately 3% by weight of 235U. The cleavable content of the third plurality of elements 50 (RU / DU and / or SEUZ) is also selected from the same range, but differs from the cleavable content selected for the second plurality of elements 46. In some embodiments of Fig. 6, a BP is included in any of the fuel elements 22. In other embodiments, each of the second plurality of elements 46 includes RU, DU or SEU within corresponding ranges of fissile content, and similarly, the third plurality of elements 50 may each include RU. , DU or SEU within the corresponding cleavable content range, where the first cleavable content differs from the second cleavable content. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. In other embodiments, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
The embodiment of Fig. 7 is substantially similar to the embodiment of Fig. 6 described above, except that the fuel bundle 14 is a 37-element fuel bundle having uniformly large fuel elements 22, as described above. The distribution of nuclear fuel in the central, first, second and third plurality of elements 38, 42, 46 resp. 50, is similar to that of Fig. 6 and has therefore been described above. The embodiments of Fig. 7 provide an example of how the particular number of fuel elements, the arrangement of fuel elements (e.g. rings of elements in the illustrated embodiments), sizes of fuel elements, and relative sizes of fuel elements can be changed but still included in the present invention. In some embodiments, the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14. In other embodiments, the fissile content decreases in an outward radial direction from the center of the fuel bundle 14.
Alternatively, any of the embodiments of Figs. 4-7 include a single fissile content of enriched uranium in both outer two of the plurality of elements (i.e., in both the second plurality of elements 46 and in the third plurality of elements 50). In some embodiments, for example, the simple cleavable content is selected in a range greater than 1.8% by weight. As another example, the simple fissile content is selected from a range of less than 1.7% by weight. In other embodiments, any combination of RU, DU, LEU, NU and SEU (propellant) at two different locations in the fuel bundle 14 may be used in combination with thorium dioxide and / or BP at other locations in the fuel bundle 14 so that the fissile content of a first element of the propellant differs from the fissile content of a second element of the propellant.
The propellant provides the neutrons needed to convert non-fissile hydrogen to the fissile wall so that the thorium dioxide burns efficiently in a nuclear reactor. BP is used to increase safety-related parameters, unwanted coolant void reactivity (CVR) and fuel temperature coefficient (FTC). As noted above, a BP may be included in any of the elements or locations in the fuel bundle 14, or may be included in an element or at a position itself (i.e., without having to be mixed with fuel in a fuel element or otherwise included with the fuel on a fuel element position). It is also true in some embodiments that the fissile content of nuclear fuel decreases in an outward radial direction from the center of the fuel bundle 14, while in other embodiments, the fissile content increases in an outward radial direction from the center of the fuel bundle 14.
The embodiments and embodiments described herein can also be used with pressure tubes that are larger or smaller than those used in current pressure tube reactors and can also be used in future heavy water pressure tube reactors. The fuel bundles 14 of the present invention can also be used in pressure pipe reactors with different combinations of liquids / gases in their heat transport or moderator system. The present invention can also be used for fuel bundles having a different number and arrangement of elements, and is not limited to a 43-element and 37-element fuel bundle design, such as those illustrated as examples in Figs. 1-7.
Fuel bundles using compositions of thorium and uranium isotopes (heterogeneous or homogeneous) may allow more precise control of energy coefficient, bundle effects, channel effects, flow levels, core flow shapes, critical heat flows, and so-called undesired nuclear reactivity of a nuclear reactor. at the same time as the source utilization can be significantly increased.
Any of the fuels described herein can be provided in inert matrix carriers, and / or can be used in such a way that they increase fuel consumption and avoid limitations on the mechanical properties of base fuels, further increasing the utilization rate of the fuel source.
Such extensions / carriers will also allow a more precise control of, for example, split gas release and associated design criteria and heat transfer coefficients.
Furthermore, in heavy water cooling reactors, the proportion of neutron multiplication increases when unwanted cooling occurs. Unwanted refrigerant reactivity occurs, for example, when the refrigerant begins to boil. Undesirable refrigerant reactivity is a measure of the ability of a reactor to multiply neutrons. This phenomenon occurs due to positive unwanted refrigerant reactivity, and is an unwanted event.
The present invention can provide a significant reduction in unwanted refrigerant reactivity, and can also provide a negative fuel temperature coefficient and / or a negative power coefficient.
The embodiments described above, and illustrated in the drawings, are presented by way of example only and are not intended to constitute a limitation of the concepts or principles of the present invention. As such, it will be apparent to one of ordinary skill in the art that various changes in the elements and their configuration and arrangement are possible without departing from the spirit of the present invention. For example, in various embodiments described and / or illustrated here, LEU and SEU are mixed with different types of nuclear fuels to create nuclear fuels with the desired fission content. It should be noted that in other embodiments, highly enriched uranium (HEU), and / or LEU may be mixed with different fuels described herein to create nuclear fuels having the same fission content. Such HEU and LEU nuclear fuel blends can be used in all embodiments of the present invention.

权利要求:
Claims (73)
[1]
A fuel bundle for a nuclear reactor comprising: a first fuel element including thorium dioxide; a second fuel element including uranium having a first fissile content; and a third fuel element including uranium having a second fissile content different from the first fissile content.
[2]
The fuel bundle of claim 1, wherein the uranium has a first fissile content that includes recycled uranium having a fissile content of approximately 0.72% by weight of 'su tiii approximately 1.2% by weight of sssu.
[3]
The fuel bundle of claim 2, wherein the uranium has a second fissile content that includes recycled uranium having a fissile content of approximately 0.72 vii
[4]
The fuel bundle of claim 2, wherein the uranium has a second fissile content that includes readily enriched uranium having a fissile content of approximately 0.9 wt-fx, of "su tiii approximately 3 wt% of" su
[5]
The fuel bundle of claim 2, wherein the uranium has a second fissile content that includes natural uranium with a fissile content of approximately 0.71 vii
[6]
The fuel bundle of claim 2, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3 vii 10 15 20 25 30 17
[7]
The fuel assembly of claim 1, wherein the uranium has a first fissile content that includes readily enriched uranium having a fissile content of approximately 0.9% by weight of the sol to approximately 3 vii
[8]
The fuel assembly of claim 7, wherein the uranium has a second fissile content that includes readily enriched uranium having a fissile content of approximately 0.9 vii
[9]
The fuel assembly of claim 7, wherein the uranium has a second fissile content that includes natural uranium with a fissile content of approximately 0.71% by weight of
[10]
The fuel assembly of claim 7, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U.
[11]
The fuel assembly of claim 1, wherein the uranium has a first fissile content that includes natural uranium having a fissile content of approximately 0.71 vii
[12]
The fuel assembly of claim 11, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U.
[13]
The fuel assembly of claim 1, wherein the uranium has a first fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of SU to approximately 20% by weight of 235U.
[14]
The fuel assembly of claim 13, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U. 10 15 20 25 30 18
[15]
The fuel bundle according to any one of claims 2-14, wherein the uranium included in at least one of the second fuel element and the third fuel element is included with at least one of recycled uranium with a fissile content of approximately 0.72% by weight of 235U to approximately 1 , 2% by weight of 235U, depleted uranium with a fissile content of approximately 0.2% by weight of SU to approximately 0.5% by weight of 235U, lightly enriched uranium with a fissile content of approximately 0.9% by weight. % of 235U to approximately 3% by weight of 235U, natural uranium having a fissile content of approximately 0.71% by weight of 235U, and low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U.
[16]
The fuel bundle according to any one of claims 2-14, wherein the uranium included in at least one of the second fuel element and the third fuel element is included with a combustible poison.
[17]
The fuel bundle according to any one of claims 2-14, wherein the thorium dioxin included in the first fuel element is included with a combustible poison.
[18]
The fuel bundle of claim 1, wherein the first fuel element includes a rod of thorium dioxide.
[19]
The fuel bundle of claim 1, wherein the second fuel element includes a rod of the uranium with the first fissile contents.
[20]
The fuel bundle of claim 1, wherein the third fuel element includes a rod of the uranium with the second fissile contents.
[21]
The fuel bundle of claim 1, wherein the first fuel element includes a tube containing thorium dioxide.
[22]
The fuel bundle of claim 1, wherein the second fuel element includes a tube containing the uranium with the first fissile contents. 10 15 20 25 30 19
[23]
The fuel bundle of claim 1, wherein the third fuel element includes a tube containing the uranium with the second fissile contents.
[24]
The fuel bundle of claim 1, wherein the first fuel element includes a first plurality of tubes containing thorium dioxide.
[25]
The fuel bundle of claim 24, wherein the first plurality of tubes include seven parallel tubes containing thorium dioxide.
[26]
The fuel bundle of claim 24, wherein the first plurality of tubes include eight parallel tubes containing thorium dioxide.
[27]
The fuel bundle of claim 24, wherein the second fuel element includes a second plurality of tubes containing the uranium having a first fissile content and disposed radially outward from the first plurality of tubes containing thorium dioxide.
[28]
The fuel bundle of claim 27, wherein the second plurality of tubes include twelve parallel tubes containing the uranium with the first fissile contents.
[29]
The fuel bundle of claim 27, wherein the second plurality of tubes include fourteen parallel tubes containing the uranium with the first fissile contents.
[30]
The fuel bundle of claim 27, wherein at least one of the second plurality of tubes has a different cross-sectional size than that of at least one of the first plurality of tubes.
[31]
The fuel bundle of claim 27, wherein the third fuel element includes a third plurality of tubes containing the uranium with the second fissile contents and located radially outwardly from the second plurality of tubes containing the uranium with the first fissile contents. 10 15 20 25 30 20
[32]
The fuel bundle of claim 31, wherein the third plurality of tubes include eighteen parallel tubes containing the uranium with the second fissile contents.
[33]
The fuel bundle of claim 31, wherein the third plurality of tubes include twenty-one parallel tubes containing the uranium with the second fissile contents.
[34]
The fuel bundle of claim 31, wherein at least one of the third plurality of tubes has a different cross-sectional size than that of at least one of the first plurality of tubes.
[35]
The fuel bundle of claim 31, wherein at least one of the third plurality of tubes has a different cross-sectional size than that of at least one of the second plurality of tubes.
[36]
The fuel bundle of claim 31, wherein the uranium has a second fissile content that includes recycled uranium having a fissile content of approximately 0.72 vii
[37]
The fuel bundle of claim 36, wherein the uranium has a second fissile content that includes recycled uranium having a fissile content of approximately 0.72 vii <1-% of "su: iii approximately 1.2 vii.
[38]
The fuel bundle of claim 36, wherein the uranium has a second fissile content that includes readily enriched uranium with a fissile content of approximately 0.9% by weight of "SU to approximately 3% by weight of 235U.
[39]
The fuel bundle of claim 36, wherein the uranium has a second fissile content that includes natural uranium with a fissile content of approximately 0.71 vii 10 15 20 25 30 21
[40]
The fuel bundle of claim 36, wherein the uranium has a second fissile content that includes light-enriched uranium with a fissile content of approximately 3% by weight of SU to approximately 20% by weight of 235U.
[41]
The fuel bundle of claim 31, wherein the uranium has a first fissile content that includes readily enriched uranium having a fissile content of approximately 0.9% by weight of 235U to approximately 3% by weight of 235U.
[42]
The fuel bundle of claim 41, wherein the uranium has a second fissile content that includes recycled uranium having a fissile content of approximately 0.72% by weight of ﬁ u to approximately 1.2 vii
[43]
The fuel bundle of claim 41, wherein the uranium has a second fissile content that includes readily enriched uranium having a fissile content of approximately 0.9% by weight of 235U to approximately 3% by weight of 235U.
[44]
The fuel bundle of claim 41, wherein the uranium has a second fissile content that includes natural uranium with a fissile content of approximately 0.71% by weight of
[45]
The fuel bundle of claim 41, wherein the uranium has a second fissile content that includes light-enriched uranium with a fissile content of approximately 3% by weight of SU to approximately 20% by weight of 235U.
[46]
The fuel bundle of claim 31, wherein the uranium has a first fissile content that includes natural uranium with a fissile content of approximately 0.71% by weight of "Su
[47]
The fuel bundle of claim 46, wherein the uranium has a second fissile content that includes recycled uranium with a fissile content of approximately 0.72% by weight of 1.2% by weight of 235u. 10 15 20 25 30 22
[48]
The fuel bundle of claim 46, wherein the uranium has a second fissile content that includes easily enriched uranium having a fissile content of approximately 0.9% by weight of SU to approximately 3% by weight of 235U.
[49]
The fuel bundle of claim 46, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U.
[50]
The fuel bundle of claim 31, wherein the uranium has a first fissile content that includes low enriched uranium having a fissile content of approximately 3% by weight of "SU to approximately 20% by weight of 235U.
[51]
The fuel bundle of claim 50, wherein the uranium has a second fissile content that includes recycled uranium having a fissile content of approximately 0.72% by weight of 235U to approximately 1.2% by weight of 235U.
[52]
The fuel bundle of claim 50, wherein the uranium has a second fissile content that includes readily enriched uranium having a fissile content of approximately 0.9 vii
[53]
The fuel bundle of claim 50, wherein the uranium has a second fissile content that includes natural uranium with a fissile content of approximately 0.71% by weight of 235u.
[54]
The fuel bundle of claim 50, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 3 vii
[55]
The fuel bundle of claim 31, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 1.25 wt. 10 15 20 25 30 23
[56]
The fuel bundle of claim 55, wherein the uranium has a second fissile content that includes low enriched uranium having a fissile content of approximately 1.70 vii
[57]
The fuel bundle according to any one of claims 32-56, wherein the uranium included in at least one of the second plurality of tubes and the third plurality of tubes is included with at least one of recycled uranium having a fissile content of approximately 0.72% by weight of 235U to approximately 1.2% by weight of 235U, depleted uranium having a fissile content of approximately 0.2% by weight of 235U to approximately 0.5% by weight of 235U, lightly enriched uranium having a fissile content of approximately 0.9% by weight % of 235U to approximately 3% by weight of 235U, natural uranium with a fissile content of appraximaiivi 0.71 wt., of 2350, and low enriched uranium with a fissile content of approximately 3% by weight of "SU to approx. 20% by weight of 235U.
[58]
The fuel bundle according to any one of claims 32-56, wherein the uranium included in at least one of the second plurality of pipes and the third plurality of pipes is included with a combustible poison.
[59]
The fuel bundle according to any one of claims 32-56, wherein the thorium dioxin included in the first number of tubes is included with a combustible poison.
[60]
The fuel bundle of claim 31, further comprising a fourth fuel element.
[61]
The fuel bundle of claim 60, wherein the fourth fuel element includes at least one tube.
[62]
The fuel bundle of claim 61, wherein the first plurality of tubes are arranged radially outward from at least one tube of the fourth fuel element. 10 15 20 25 30 24
[63]
The fuel bundle of claim 62, wherein at least one tube includes thorium dioxide.
[64]
The fuel bundle of claim 62, wherein at least one tube includes a combustible poison.
[65]
The fuel bundle of claim 62, wherein at least one uranium-containing tube has a third fissile content.
[66]
The fuel bundle of claim 65, wherein at least the third fissile content differs from at least one of the first fissile content and the second cleavable content.
[67]
The fuel bundle of claim 65, wherein the uranium has a third fissile content that includes recycled uranium with a fissile content of approximately 0.72% by weight of 'Su ti | approximately 1.2% by weight of “Su
[68]
The fuel bundle of claim 63, wherein the uranium has a third fissile content that includes lightly enriched uranium with a fissile content of approximately 0.9% by weight of "SU to approximately 3% by weight of 235U.
[69]
The fuel bundle of claim 63, wherein the uranium has a third fissile content that includes natural uranium with a fissile content of approximately 0.71% by weight of ZSSU.
[70]
The fuel bundle of claim 63, wherein the uranium has a third fissile content that includes low enriched uranium with a fissile content of approximately 3% by weight of 'Su to approximately 20% by weight of ZSSU. 10 15 25
[71]
The fuel bundle of any one of claims 61-70, wherein the uranium included in at least one tube is included with at least one of recycled uranium having a fissile content of approximately 0.72% by weight of 235U to approximately 1.2% by weight of 235U. , depleted uranium with a fissile content of approximately 0.2 vii enriched uranium with a fissile content of approximately 0.9% by weight of SU to approximately 3% by weight of 235U, natural uranium with a fissile content of approximately 0.71 % by weight of 235U, and low enriched uranium having a fissile content of approximately 3% by weight of 235U to approximately 20% by weight of 235U, and a combustible poison.
[72]
The fuel bundle of claim 71, wherein the second fissile content is higher than the first fissile content.
[73]
A nuclear reactor comprising: a pressurized fluid tube; and the fuel bundle according to any one of claims 1-72.

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同族专利:

公开号 | 公开日

US20130202076A1|2013-08-08|

KR20190110654A|2019-09-30|

EP2612328B1|2018-04-04|

WO2012028900A1|2012-03-08|

CN107068209A|2017-08-18|

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CN103189925A|2013-07-03|

RO129128B1|2021-10-29|

CA2810133A1|2012-03-08|

KR102025676B1|2019-09-26|

CN107068209B|2020-09-15|

CA2810133C|2021-04-13|

RO129128A2|2013-12-30|

US20180240557A1|2018-08-23|

US9799414B2|2017-10-24|

CN103189925B|2016-09-14|

EP2612328A1|2013-07-10|

KR102143850B1|2020-08-12|

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法律状态:
2015-03-31| NAV| Patent application has lapsed|

优先权:

申请号 | 申请日 | 专利标题

PCT/IB2010/002501|WO2012028900A1|2010-09-03|2010-09-03|Nuclear fuel bundle containing thorium and nuclear reactor comprising same|

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