CN113488205A - Non-uniform tubular MA transmutation rod with flattening reactor core axial power function - Google Patents

Non-uniform tubular MA transmutation rod with flattening reactor core axial power function Download PDF

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CN113488205A
CN113488205A CN202110852206.7A CN202110852206A CN113488205A CN 113488205 A CN113488205 A CN 113488205A CN 202110852206 A CN202110852206 A CN 202110852206A CN 113488205 A CN113488205 A CN 113488205A
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lid
transmutation
mixed fuel
rod
layer
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CN113488205B (en
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叶滨
张二品
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Southwest University of Science and Technology
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Southwest University of Science and Technology
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C5/00—Moderator or core structure; Selection of materials for use as moderator
    • G21C5/18—Moderator or core structure; Selection of materials for use as moderator characterised by the provision of more than one active zone
    • G21C5/20—Moderator or core structure; Selection of materials for use as moderator characterised by the provision of more than one active zone wherein one zone contains fissile material and another zone contains breeder material
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C5/00—Moderator or core structure; Selection of materials for use as moderator
    • G21C5/02—Details
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • 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)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Plasma & Fusion (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention discloses a non-uniform tubular MA transmutation rod with the function of flattening the axial power of a reactor core, which comprises: a central layer arranged at the center of the non-uniform tubular MA transmutation rod and provided with a plurality of holes6LiD/MA/UO2The layer of mixed fuel is then formed,6LiD/MA/UO2an air gap layer is arranged outside the mixed fuel layer, and a zirconium alloy cladding is arranged outside the air gap layer; the non-uniform tubular MA transmutation rod is provided with odd-numbered sections in the axial direction6LiD/MA/UO2Mixed fuel layer, from the upper end to the middle position of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer increases gradually section by section; from the middle position to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2M in the mixed fuel bedThe proportion of the A nuclide decreases gradually. The non-uniform tubular MA transmutation rod provided by the invention improves the transmutation rate of MA nuclide, has a flattening effect on the radial and axial power of a reactor core, can improve the conditions of overhigh neutron flux and low external flux in the reactor core, and reduces the power peak factor of each component in the reactor core.

Description

Non-uniform tubular MA transmutation rod with flattening reactor core axial power function
Technical Field
The invention belongs to the technical field of nuclear fuel transmutation assemblies of pressurized water reactors, and particularly relates to a non-uniform tubular MA transmutation rod with a function of flattening axial power of a reactor core.
Background
The nuclear waste is from many sources, and the spent fuel generated by the operation of the reactor accounts for the most part. The radioactive waste is divided into low, medium and high radioactive waste according to radioactive moisture and is divided into three types of short, medium and long according to half-life length. The most concerned and urgent problem is how to dispose of a large amount of High-Level waste generated by a nuclear power plant, particularly how to dispose of Long-life High-Level Wastes (LHLW).
The Long-life high-level waste includes Minor Actinides (MA) and Long-life Fission Products (LLFP). MA nuclide in spent fuel, mainly237Np、241Am、243Am、244Cm、245Cm, long-lived species. Although in a small amount, has strong radioactivity and a long half-life, e.g.237The half-life of Np is as long as two hundred and more ten thousand years. At present, the international treatment of spent fuel usually finally adopts a scheme of long-term low-quality storage after solidification, but for long-life high-radioactivity nuclides such as MA, the nuclides with long service life and high radioactivity are difficult to ensure that the nuclides cannot leak into an underground water system due to geological activity and the like in the long-term sealing process to cause pollution.
The technique of discrete and Transmutation (P & T) is proposed in such a large background that: firstly, separating long-life actinide nuclides and long-life fission products from high-level waste, and then concentrating the actinide nuclides and the long-life fission products to be placed in a reactor for transmutation to enable the actinide nuclides to become stable or short-life nuclides.
Transmutation is the only method capable of converting long-life nuclides into short-life nuclides or stable nuclides, and a plurality of devices capable of being used for transmutation are provided, and compared with fast reactors and ADS (accelerator driven subcritical system) transmutation devices, a thermal reactor, particularly a pressurized water reactor, is an ideal reactor type for performing MA transmutation at present as the reactor type with the largest number of global commercial nuclear power stations.
France, japan, usa and the like have conducted relevant studies on the transmutation of the thermopile, japan has conducted deeper studies on the transmutation of the pressurized water reactor, for example, Tomohiko and the like have studied the neutron economy of the MA transmutation in the thermopile, and the studies show that the neutron economy can be better when the neutron flux is higher, and simultaneously Kunieda and the like of japan have issued a new nuclear database for the transmutation study of the fission product with a long life in 2018.
The research on transmutation of MA in the thermal reactor in China is also many, for example, a fuel consumption program is utilized to research transmutation MA nuclide in a high-flux thermal neutron reactor and a pressurized water reactor, and related research schemes are provided, wherein the research schemes comprise that MA is mixed with fuel, and MA is made into a single transmutation rod to replace part of fuel rods of a reactor core. In addition, the North China Power university and the like also carry out related research on the transmutation of minor actinides in burnable poison assemblies and research on the influence of MA transmutation on the safety of a reactor core in a pressurized water reactor. These studies mainly show the transmutation performance of the pressurized water reactor and the influence of the addition of MA nuclide in the pressurized water reactor on the parameters and performance of the reactor core, such as the reactor core KeffNeutron spectrum, neutron flux, etc.
237Np、241Am、243Am、244Cm nuclide the fission cross section of the four MA nuclides is in a high energy region (E)>1MeV) is higher and with235U has a fission cross section equivalent to that of the energy region but small in the low energy region, and235the fission cross section of U in a low energy region is more than two orders of magnitude lower, so that the direct fission rate is lower when the MA nuclide is directly loaded into a pressurized water reactor.
Meanwhile, the capture reaction of the MA nuclide is easily caused by the neutron energy spectrum characteristic of the thermal reactor, so that the direct fission rate of the MA nuclide can be improved if a material is added while loading the MA transmutation material for improving the neutron energy of transmutation. Thus, there is a need for a transmutation rod structure that can increase the neutron energy of transmutation in the core, thereby increasing the direct rate of fission of the MA nuclides.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a non-uniform tube MA transmutation rod with a flattened core axial power function, comprising:
a central layer positioned in the center of the non-uniform tubular MA transmutation rod, and the outside of the central layer is provided with a6LiD/MA/UO2Mixed fuel layer, said6LiD/MA/UO2An air gap layer is arranged outside the mixed fuel layer, and a zirconium alloy cladding is arranged outside the air gap layer;
the non-uniform tubular MA transmutation rod is provided with odd sections in the axial direction6LiD/MA/UO2Mixed fuel layer, and two adjacent sections6LiD/MA/UO2The mass shares of MA nuclides in the mixed fuel layer are different from the upper end to the middle position of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer increases gradually section by section; from the middle position to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer decreases section by section.
Preferably, the central layer is a solid structure or a hollow gap structure.
Preferably, the non-uniform tubular MA transmutation rod is provided with three sections in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer and third stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel layer and third stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 1% -3%, and the second stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
Preferably, the non-uniform tubular MA transmutation rod is provided with five sections in the axial direction6LiD/MA/UO2Transmutation of mixed fuel layers from heterogeneous tubular MAThe upper end to the lower end of the rod is marked as the first section in sequence6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer, third stage6LiD/MA/UO2Mixed fuel layer, fourth stage6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 1%, and the second stage6LiD/MA/UO2Mixed fuel bed and fourth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 3%, and the third section6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
Preferably, the non-uniform tubular MA transmutation rod is provided with seven segments in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer, third stage6LiD/MA/UO2Mixed fuel layer, fourth stage6LiD/MA/UO2Mixed fuel layer, fifth stage6LiD/MA/UO2Mixed fuel layer, sixth stage6LiD/MA/UO2Mixed fuel bed and seventh stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel bed and seventh stage6LiD/MA/UO2The ratio of MA nuclide in the mixed fuel layer is 0%, and the second stage6LiD/MA/UO2Mixed fuel bed and sixth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 1%, and the third section6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 3%, and the fourth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6mass of LiD and MA nuclidesThe ratio is fixed at 1: 9.
Preferably, wherein, the6LiD/MA/UO2The composition of the MA nuclide in the mixed fuel layer comprises237Np、241Am、243Am, and244cm, wherein237The mass ratio of Np is 56.36%,241am accounts for 26.48 percent by mass,243am accounts for 12.03 percent by mass,244cm accounts for 5.12% of the total mass.
Preferably, the center positions of the fuel assemblies in the x-axis direction and the y-axis direction are respectively loaded with 2 non-uniform tubular MA transmutations, and the four corners of the fuel assemblies are respectively loaded with 3 non-uniform tubular MA transmutations, that is, 16 non-uniform tubular MA transmutations are loaded in one fuel assembly; 36 groups of fuel assemblies with the fuel enrichment degree of 3.1 percent are loaded in the reactor core close to the central position, and 60 groups of fuel assemblies with the fuel enrichment degree of 3.1 percent are loaded in the reactor core except the central position, namely 1536 non-uniform tubular MA transmutation rods are loaded in one reactor core.
Preferably, the tube wall thickness of the non-uniform tubular MA transmutation rod is 0.05 cm-0.3 cm.
The invention at least comprises the following beneficial effects:
the non-uniform tubular MA transmutation rod provided by the invention improves the transmutation rate of MA nuclides, and the radial and axial power of the core has a flattening effect;
after the non-uniform tubular MA transmutation rod provided by the invention is reloaded into the reactor core, the conditions that the neutron flux inside the reactor core is high and the neutron flux outside the reactor core is very low can be improved, and the power peak factor of each component of the reactor core is reduced; in addition, the MA nuclide can play a role of burnable poison in the reactor core, provides certain negative reactivity at the initial operation stage of the reactor, and compensates certain positive reactivity at the later operation stage;
the MA transmutation rod is designed to be axially divided into uniform parts, so that the radial and axial power of the reactor core can be effectively flattened, for example, the axial power scheme of the transmutation rod is adopted, namely the mass shares of the MA nuclides from two ends to the center are respectively 1%, 3% and 5%, and the mass shares are calculated according to the weight percentage6Adding LiD and MA in the ratio of 1 to 96The LiD, the thickness of the tube wall is set to be 0.1cm, the axial power peak factor 1.666 of the reactor core can be improved to 1.249 when the MA transmutation rod is not loaded, and the power peak shape is obviously improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a non-uniform tubular MA transmutation rod with a function of flattening axial power of a reactor core, which is provided by the invention;
FIG. 2 is a schematic diagram of the structure of the non-uniform tubular MA transmutation rod of example 1;
FIG. 3 is a schematic diagram of the structure of the non-uniform tubular MA transmutation rod of example 2;
FIG. 4 is a schematic diagram of the structure of the non-uniform tubular MA transmutation rod of example 3;
FIG. 5 is a schematic diagram of the structure of the non-uniform tubular MA transmutation rod of example 4;
FIG. 6 is a schematic structural view of a uniform tubular MA transmutation rod according to example 17;
FIG. 7 is a schematic diagram of the placement of a non-uniform tube MA transmutation rod in a fuel assembly;
FIG. 8 is a schematic view of the arrangement of fuel assemblies with non-uniform tubular MA transmutation rods in a core;
FIG. 9 is a comparison of the effect of various transmutation schemes on the effective increment coefficient of the reactor core in the life time;
FIG. 10 is a radial neutron flux distribution curve for a clean core not loaded with uniform tube MA transmutation rods;
FIG. 11 is a radial neutron flux distribution curve of a reactor core after loading a uniform tube type MA transmutation rod;
FIG. 12 shows 1/4 core assembly thermoelectric factors after loading of the uniform tube MA transmutation rods;
FIG. 13 is a 1/4 core assembly thermoelectric factor after further optimization;
FIG. 14 is a core axial power distribution under different scenarios;
FIG. 15 is a drawing showing237The variation curve of Np nuclear density with burn time;
FIG. 16 is a drawing showing241Am nucleon density variation curve with burn time;
FIG. 17 is a drawing showing243Am nucleon density variation curve with burn time;
FIG. 18 is a drawing showing244The Cm nuclear density curve along with the burn time;
FIG. 19 is a graph of nuclear density of MA nuclides as a function of burn time;
FIG. 20 is wall thickness pair of hollow transmutation tube237Influence curves of Np evolution variability;
FIG. 21 is a wall thickness pair of hollow transmutation tubes241Am evolution rate influence curve;
FIG. 22 is wall thickness pair of hollow transmutation tube243Am evolution rate influence curve;
FIG. 23 shows the wall thickness of a hollow transmutation tube244Cm evolution rate influence curve;
FIG. 24 is a graph showing the effect of the wall thickness of hollow transmutation tubes on the total transmutation rate of MA nuclides.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1 and 2: the nonuniform tube type MA transmutation rod with the function of flattening the axial power of the reactor core provided by the embodiment structurally comprises:
a central layer 1 positioned at the center of the non-uniform tubular MA transmutation rod, wherein the outside of the central layer 1 is provided with a6LiD/MA/UO2The mixed fuel layer 2, the tube wall thickness of the non-uniform tube type MA transmutation rod is 0.1cm, the thickness of the tube wall is larger than the thickness of the tube wall6LiD/MA/UO2The outside of the mixed fuel layer 2 is provided with an air gap layer 3, and the outside of the air gap layer 3 is provided withA zirconium alloy cladding 4;
three sections are arranged in the axial direction of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, and two adjacent sections6LiD/MA/UO2The mass shares of MA nuclides in the mixed fuel layer are different from the upper end to the middle position of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer increases gradually section by section; from the middle position to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer decreases section by section. The upper end and the lower end of the non-uniform tubular MA transmutation rod are sequentially marked as a first section6LiD/MA/UO2 Mixed fuel layer 21, second stage6LiD/MA/UO2 Mixed fuel layer 22 and third stage6LiD/MA/UO2 Mixed fuel layer 23, first section thereof6LiD/MA/UO2 Mixed fuel layer 21 and third stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer 23 is 1%, and the second stage6LiD/MA/UO2The proportion of MA species in the mixed fuel layer 22 is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
Example 2
As shown in fig. 1 and 3, the structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the core according to the embodiment includes:
a central layer 1 positioned at the center of the non-uniform tubular MA transmutation rod, wherein the outside of the central layer 1 is provided with a6LiD/MA/UO2The mixed fuel layer 1 and the non-uniform tubular MA transmutation rods have the tube wall thickness of 0.1cm6LiD/MA/UO2An air gap layer 3 is arranged outside the mixed fuel layer 2, and a zirconium alloy cladding 4 is arranged outside the air gap layer 3;
the axial direction of the non-uniform tubular MA transmutation rod is provided with three sections6LiD/MA/UO2Mixed fuel layers, adjacent two sections6LiD/MA/UO2The mass shares of MA nuclides in the mixed fuel layer are different from the upper end to the middle position of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer increases gradually section by section; from the middle position to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer decreases section by section. The upper end and the lower end of the non-uniform tubular MA transmutation rod are sequentially marked as a first section6LiD/MA/UO2 Mixed fuel layer 24, second segment6LiD/MA/UO2 Mixed fuel layer 25 and third stage6LiD/MA/UO2 Mixed fuel layer 26 of which the first section6LiD/MA/UO2 Mixed fuel layer 24 and third stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer 26 is 3%, and the second stage6LiD/MA/UO2The proportion of MA species in the mixed fuel layer 25 is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
Example 3
As shown in fig. 1 and 4, the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the core of the embodiment comprises:
a central layer 1 positioned at the center of the non-uniform tubular MA transmutation rod, wherein the outside of the central layer 1 is provided with a6LiD/MA/UO2The mixed fuel layer 2, the tube wall thickness of the non-uniform tube type MA transmutation rod is 0.1cm, the thickness of the tube wall is larger than the thickness of the tube wall6LiD/MA/UO2An air gap layer 3 is arranged outside the mixed fuel layer 2, and a zirconium alloy cladding 4 is arranged outside the air gap layer 3;
the non-uniform tubular MA transmutation rod is provided with five sections in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2 Mixed fuel layer 27, second section6LiD/MA/UO2 Mixed fuel layer 28, third stage6LiD/MA/UO2 Mixed fuel bed 29, fourth stage6LiD/MA/UO2 Mixed fuel bed 210 and fifth stage6LiD/MA/UO2 Mixed fuel layer 211 of which the first section6LiD/MA/UO2 Mixed fuel layer 27 and fifth stage6LiD/MA/UO2The MA nuclide content in the mixed fuel layer 211 is 1 percent, and the second stage 6LiD/MA/UO2 Mixed fuel bed 28 and fourth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer 210 is 3%, and the third stage6LiD/MA/UO2The proportion of the MA nuclide in the mixed fuel layer 29 is 5 percent,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
Example 4
As shown in fig. 1 and 5, the structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the core according to the embodiment includes:
a central layer 1 positioned at the center of the non-uniform tubular MA transmutation rod, wherein the outside of the central layer 1 is provided with a6LiD/MA/UO2The mixed fuel layer 2, the tube wall thickness of the non-uniform tube type MA transmutation rod is 0.1cm, the thickness of the tube wall is larger than the thickness of the tube wall6LiD/MA/UO2An air gap layer 3 is arranged outside the mixed fuel layer 2, and a zirconium alloy cladding 4 is arranged outside the air gap layer 3;
the non-uniform tubular MA transmutation rod is provided with seven sections in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer 212, second segment6LiD/MA/UO2Mixed fuel layer 213, third stage6LiD/MA/UO2Mixed fuel layer 214, fourth stage6LiD/MA/UO2Mixed fuel layer 215, fifth stage6LiD/MA/UO2Mixed fuel layer 216, sixth stage6LiD/MA/UO2Mixed fuel bed 217 and seventh stage6LiD/MA/UO2Mixed fuel bed 218, first section thereof6LiD/MA/UO2Mixed fuel layer 212 and seventh stage6LiD/MA/UO2The MA nuclide content in the mixed fuel layer 218 is 0%, and the second stage6LiD/MA/UO2Mixed fuel layer 213 and sixth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer 217 is 1%, and the third section6LiD/MA/UO2Mixed fuel layer 214 and fifth stage6LiD/MA/UO23% of MA nuclide in the mixed fuel layer 216, and a fourth stage6LiD/MA/UO2The proportion of MA species in the mixed fuel layer 215 is 5%,6the mass ratio of LiD to MA nuclein is fixed at 1: 9.
Example 5
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 1, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.05 cm.
Example 6
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 1, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.15 cm.
Example 7
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 1, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.2 cm.
Example 8
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 2, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.05 cm.
Example 9
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 2, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.15 cm.
Example 10
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 2, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.2 cm.
Example 11
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 3, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.05 cm.
Example 12
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 3, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.15 cm.
Example 13
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 3, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.2 cm.
Example 14
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 4, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.05 cm.
Example 15
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 4, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.15 cm.
Example 16
The structure of the non-uniform tubular MA transmutation rod with the function of flattening the axial power of the reactor core is the same as that of the non-uniform tubular MA transmutation rod in the embodiment 4, but the wall thickness of the non-uniform tubular MA transmutation rod is 0.2 cm.
Example 17
As shown in fig. 6, the structure of the uniform tube MA transmutation rod provided in this embodiment includes:
a central layer 5 positioned at the center of the uniform tube type MA transmutation rod, wherein the outside of the central layer 5 is provided with6LiD/MA/UO2The mixed fuel layer (6) is,6LiD/MA/UO2the mixed fuel layer 6 is uniformly distributed in the axial direction of the uniform tube type MA transmutation rod6LiD/MA/UO2The outside of the mixed fuel layer 6 is provided with an air gap layer 7, and the outside of the air gap layer 7 is provided with a zirconium alloy bagA shell 8; the wall thickness of the uniform tubular MA transmutation rod is 0.05 cm.
Example 18
The structure of the uniform tubular MA transmutation rod of this example is the same as that of the uniform tubular MA transmutation rod of example 17, but the wall thickness of the uniform tubular MA transmutation rod is 0.1 cm.
Example 19
The uniform tube-type MA transmutation rod of this example had the same structure as the uniform tube-type MA transmutation rod of example 17, but the wall thickness of the uniform tube-type MA transmutation rod was 0.15 cm.
Example 20
The structure of the uniform tubular MA transmutation rod of this example is the same as that of the uniform tubular MA transmutation rod of example 17, but the wall thickness of the uniform tubular MA transmutation rod is 0.2 cm.
Example 21
The uniform tube-type MA transmutation rod of this example had the same structure as the uniform tube-type MA transmutation rod of example 17, but the wall thickness of the uniform tube-type MA transmutation rod was 0.25 cm.
Example 22
The structure of the uniform tubular MA transmutation rod of this example is the same as that of the uniform tubular MA transmutation rod of example 17, but the wall thickness of the uniform tubular MA transmutation rod is 0.3 cm.
Examples 1, 2, 3 and 4 are four different designs of the non-uniform tubular MA transmutation rods with flattened core axial power of the invention, respectively, and examples 5-7 are the same designs as in example 1, but with the same structure6LiD/MA/UO2The thickness of the mixed fuel layer is different; examples 8 to 10 are the same as in example 2, except that6LiD/MA/UO2The thickness of the mixed fuel layer is different; examples 11 to 13 are the same design as in example 3, but6LiD/MA/UO2The thickness of the mixed fuel layer is different; examples 14 to 16 are the same design as in example 4, but6LiD/MA/UO2The thickness of the mixed fuel layer is different; examples 17 to 22 are designs of homogeneous tube MA transmutation rods, in whichIn various embodiments6LiD/MA/UO2The mixed fuel layer is different in thickness. Example 1, example 5, example 6 and example 7 are referred to as scheme one, example 2, example 8, example 9 and example 10 are referred to as scheme two, example 3, example 11, example 12 and example 13 are referred to as scheme three, and example 4, example 14, example 15 and example 16 are referred to as scheme four.
The effects of the homogeneous tube MA transmutation rods on the core performance parameters were studied by loading examples 17-22 into the core. Based on the example 17 to the example 22, the MA/UO of the MA nuclide is adjusted2The mass fractions in the mixed materials are6The ratio of LiD and MA nuclides to further research the ratio of MA to UO2The effect on the performance of the transmutation,6influence of the ratio of LiD to MA on transmutation performance; MA/UO2The mass portions of the MA in the material are respectively 1 percent, 3 percent and 5 percent,6LiD: MA ratios were studied in the ranges 1:9, 2:8, 3:7, 4:6 and 5: 5.
The uniform tube MA transmutation rods or uniform tube MA transmutation rods of the above embodiments are loaded into the fuel assemblies, which will then be loaded into the core. As shown in fig. 7, in the scheme of loading the uniform tube-type MA transmutation rods and the non-uniform tube-type MA transmutation rods in the fuel assemblies, 2 transmutation rods 9 are respectively loaded in the central x-axis direction and the central y-axis direction of the fuel assembly 10, and 3 transmutation rods 9 are respectively loaded at 4 corners of the fuel assembly 10, that is, 16 transmutation rods 9 are loaded in one fuel assembly 10 in total; as shown in fig. 8, a schematic view of loading 36 groups of fuel assemblies 10 with transmutation rods 9 in a core 11, 36 groups of assemblies 10 with a fuel enrichment of 3.1% near the center and 60 groups of assemblies 10 with a fuel enrichment of 3.1% except the center are loaded in the entire core 11, and 1536 transmutation rods 9 are loaded in total in one core.
Since the addition of MA into the reactor obviously causes the change of the performance parameters of the core, the influence of the loaded transmutation rods on the performance parameters of the core needs to be considered while carrying out the research on the transmutation energy. Using RMC program, k of each scheme is counted through critical calculation, burnup calculation and countereffThe energy spectrum, etc.,the influence of each scheme on the performance parameters of the reactor core is analyzed.
According to clean reactor core, loading MA transmutation rod (without)6LiD), load addition6The research idea of the transmutation rod of the LiD and the axial nonuniform tube type MA transmutation rod is that four groups of burnup calculation data of a more typical scheme are selected and processed to obtain a curve of the change of the effective increment coefficient of the reactor core along with the burnup time step length of 540 days, as shown in FIG. 9.
FIG. 9 shows the initial k of the core after loading the MA transmutation rodseffDecreases and in the subsequent burn-up time step, keffIt remains almost unchanged because the MA nuclide can act as a burnable poison rod, and generally speaking, the core k is added with a proper amount of burnable poisoneffThe value of the effective increment coefficient of the core is gradually increased along with the progress of burnup because the large quantity of burnable poison introduces large negative reactivity to cause the core k to be in the early burnup stageeffThere is a significant drop in the burnable poison as the core operates, the introduced negative reactivity also decreases gradually, and fissionable nuclides may also be produced, thereby gradually raising the core reactivity back up.
K hereeffThe reason why the change can be kept is that the mass share ratio of the MA nuclide in the transmutation rod is only 5%, the MA nuclide also has the performance of fission, and the loading of the transmutation rod also means that fissile fuel is added, so that the effective value-added coefficient is reduced less in the initial stage, and the fission of the MA nuclide plays the role of a burnable poison in the later stage, so that the k nuclide has the function of a burnable poisoneffAnd keeping stable.
Adding different proportions of an initial reactor (without MA) energy spectrum and a transmutation rod with 5% of loaded MA mass fraction6And comparing the energy spectrums of the LiD scheme and the axial non-uniform scheme. Transmutation material is6LiD/MA/UO2The transmutation rods of the mixed materials have less influence on the energy spectrum of the reactor core. But in the thermal energy region, follow6The neutron flux is improved by increasing the ratio of LiD to MA. Computational studies have revealed that in transmutation rods6An increase in the loading of LiD will cause the transmutation rod to become inside235Decrease of U disappearanceLow (difference between initial and final burnup nucleus density/initial burnup nucleus density) so that there is a large absorption cross section for thermal neutrons235The absorption of U is reduced, and6LiD as thermal fast neutron conversion material makes MA nuclide and238the fission reaction of U is increased, and finally the neutron flux in the high energy area is almost unchanged, and the neutrons in the heat energy area follow6The LiD loading increases.
As shown in fig. 10 and 11, which reflect the radial relative neutron flux changes of the initial reactor and the core loaded with the homogeneous tube type MA transmutation rods, it can be seen that in the initial reactor, the radial neutron flux of the core generally shows a high middle and low sides, but there is a phenomenon of "high-low interleaving", and the place where the thermal neutron flux is low corresponds to the place where the high-energy neutrons are high, because the enrichment degrees of the fuel in the middle region fuel assemblies on the radial cross section are respectively 3.1% and 2.4%, when the fuel enrichment degree is 3.1%, the fuel assemblies have a strong absorption capacity for the thermal neutrons, and at the same time, the fission releases more high-energy neutrons. In addition, it can be seen that in the curve of E <1eV, the neutron fluxes at the left and right sides are higher, because the light water is in the pressurized water reactor as the reflecting layer, and the reflecting effect of the reflecting layer enables the neutron fluence rate distribution of the core flux at the central and outer edges to be improved. And because the fuel enrichment degree of the fuel assemblies at the outermost periphery of the reactor core is 4.4%, the assemblies have strong absorption capacity for thermal neutrons, and the neutron flux at the corresponding position in the curve is lower than that in the reflecting layer.
After the reactor core of the reactor core fuel assembly is loaded with the MA transmutation rods, the flux of the high, medium and low energy regions of the reactor core is in a concave shape, because the number of the MA transmutation rods loaded in the inner region of the reactor core is large, and the MA nuclides absorb a large number of neutrons with high, medium and low energy, so that the neutron flux of the corresponding region is reduced. No transmutation rods are placed within the central fuel assembly so that the thermal neutron flux has a small peak at the center.
Since the power of the core is in direct proportion to the neutron flux, corresponding to fig. 12, the variation trend of the power distribution nonuniformity coefficient of the module in the central area after loading the MA transmutation rods relative to the core is the same as the variation trend of the neutron flux, while the fuel enrichment degree in the two modules at the upper right corner is higher (4.4%), so the power distribution nonuniformity coefficient of the module is higher instead. According to the idea, a transmutation rod loading scheme is further improved, the MA transmutation rods are loaded into fuel assemblies with the enrichment degree of 3.1% and assemblies with the enrichment degree of 4.4% in the inner region of the reactor core, and 60+8 fuel assemblies are used, so that the nonuniform coefficient of the power distribution of the reactor core shown in fig. 13 can be obtained. The power non-uniformity coefficient (also called power peak factor or hot spot factor) is calculated as follows.
Figure BDA0003182765720000131
FIG. 14 reflects the axial power change of the reactor core when the reactor core is loaded with the axial nonuniform tube type MA transmutation rods with different design schemes and when the transmutation rods are not loaded. As can be seen from the figure, the axial power of the core can be effectively flattened by reasonably designing the axial non-uniformity of the transmutation rods and loading the transmutation rods into the core. In the four axial non-uniform schemes (the tube wall thicknesses are all 0.1cm), the optimal flattening effect is scheme three, namely, the shaft uniformly divides the transmutation rod into five sections, the mass fractions of the MA nuclides are 1%, 3% and 5% from two ends to the middle section in sequence, and the power peak shape under the scheme is greatly improved compared with the condition without the transmutation rod. In contrast, the flattening effect of the second scheme is insufficient, the first scheme and the fourth scheme both obviously make the axial power peak flare towards two ends, but the mass fraction of MA at two ends of the first scheme is lower, and the segmentation of the mass fraction of high MA in the fourth scheme is too concentrated, so that the relative power of the middle section of the two schemes is slightly lower. The axial power peak factor of each scheme is calculated as shown in table 1, and the axial power peak factor of the third scheme is the lowest and is 1.249.
TABLE 1 influence of axial inhomogeneous tubular MA transmutation rods on axial power peak factor of reactor core
Initial pile Scheme one Scheme two Scheme three Scheme four
Power peak factor 1.666 1.391 1.461 1.249 1.390
The transmutation rods with various schemes described in the embodiment 1-the embodiment 22 are loaded into a reactor core, the total fuel consumption time is 540 days, and the cycle of once full-power operation of a million kilowatt-level commercial pressurized water reactor is simulated. According to the result of the burnup calculation, the variation trend of the nuclear density of the MA nuclide of the partial scheme along with the burnup time step is as follows. The results show that the nuclear density of the MA nuclide in each scheme is different in the early and late burn-up period, but the overall trend of the nuclear density change along with the burn-up time step is the same, wherein237Np、 241Am、243Am decreases in nuclear density with burn time steps,244cm increases with the burn time step, since237Np、241Am、243Am can be converted to244Cm, resulting in244Cm generation rate is greater than disappearance rate, and therefore244The total amount of Cm does not decrease or increase.
In addition, because the mass share of the MA nuclide in the segment is changed by the axial non-uniform tubular MA transmutation rod, for example, the mass share of the MA nuclide at two ends in the second scheme is 3%, the total loading amount of the MA of the axial uniform transmutation rod is larger than that of the axial non-uniform transmutation rod. FIG. 15, FIG. 16, FIG. 17, FIG. 18 and FIG. 19 are views of a heterogeneous tubular MA transmutation rod in examples 1 to 4, respectively237Np、241Am、243Am、 244Cm and MA nuclei density as a function of burn-up.
The transmutation rate of the MA nuclides will decrease with increasing loading, so to determine the appropriate MA: UO2The proportion is calculated and researched by fuel consumption to obtain three MA: UO2The transmutation rates of the lower MA species in proportion are shown in table 2. The results show that as the proportion of MA in the transmutation rods increases, the rate of MA transmutation decreases, but the total amount of transmutation increases. When MA/UO2At a mass fraction of 5% MA in the mixed material, the total transmutation rate was only reduced by about 5% compared to a mass fraction of 1% MA, but the total amount of MA loading was increased by a factor of 5. The evaluation method of the transmutation rate is shown in the following formula.
Figure BDA0003182765720000141
Figure BDA0003182765720000142
Figure BDA0003182765720000151
Adding into transmutation material with 5% of mass of MA in transmutation rod6LiD, respectively calculate6The MA transmutation rates in five cases, i.e., 1:9, 2:8, 3:7, 4:6, and 5:5, are shown in table 3. The results show that6The increase of the ratio of LiD to MA gradually decreases the total transmutation rate of MA nuclides, but244The evolution rate of Cm is significantly increased due to6LiD converts part of low-energy neutrons into high-energy neutrons, and the fission cross section of the MA nuclide in a high-energy region is larger, so that the direct fission rate of the MA nuclide is improved, and the absorption capture rate is reduced.
Figure BDA0003182765720000152
The solid central layer of the non-uniform tubular MA transmutation rod is changed into the central layer of a hollow structure, and the calculation and research are carried out in the transmutation rod6(iii) transmutation performance when the thickness of each of the LiD groups is 0.05cm, 0.1cm, 0.15cm, 0.2cm, 0.25cm and 0.3cm when MA is 1:9, 2:8, 3:7, 4:6 and 5:5, five of which are6Ratio of LiD to MA237Np、 241Am、243Am and244cm the transmutation rates of the four nuclides are as shown in FIGS. 20-24. The result shows that the space self-screen effect has obvious influence on the MA transmutation, namely the MA transmutation rate is reduced along with the increase of the thickness of the tube wall, because the thin tube wall is easier to be penetrated by neutrons, the neutrons incident to the deeper part of the tube wall are reduced, and the MA nuclide positioned at the shallower part is easier to transmute. A thinner wall means a higher rate of transmutation of MA nuclides, but also means a reduction in MA loading.
The flux/power distribution of the reactor core in the axial direction is also characterized by high middle and low two sides, the neutron flux density closer to the center of the reactor core is higher, so that in order to further improve the transmutation performance of the transmutation rod, the transmutation rod is divided into three, five and seven sections in the axial direction, and the fuel consumption calculation research is carried out by four axial non-uniform schemes, wherein the schemes are respectively a scheme one: axially dividing the nuclear reactor into three sections, wherein the MA nuclide content at two ends is 1 percent, and the middle section is 5 percent; scheme II: axially dividing the structure into three sections, wherein the MA nuclide content at two ends is 3 percent, and the middle section is 5 percent; the third scheme is as follows: the nuclear power generation device is divided into five sections in the axial direction, wherein the nuclear power of MA is 1%, 3% and 5% in sequence from two ends to the middle section; scheme 4: the nuclear power generation device is axially divided into seven sections, wherein the two ends of the nuclear power generation device extend to the middle section, and the MA nuclide content is 0%, 1%, 3% and 5% in sequence. The effect of the axial non-uniformity scheme on the transmutation rate of MA nuclides is shown in table 4.
Figure BDA0003182765720000161
The results show that the second of the four solutions is used for each wall thickness244The Cm transmutation rates are the highest, which indicates that the MA nuclide direct fission rate under the scheme is higher, meanwhile, the total transmutation rate of the scheme II is the highest when the tube wall thickness is 0.1Cm and 0.15Cm, the total transmutation rate of the scheme III is the highest when the tube wall thickness is 0.05Cm and 0.2Cm, and the flattening of the axial power of the scheme III is better than that of the scheme II from the viewpoint of power flattening. In summary, the second solution can be the best solution if better transmutation effect is to be obtained, and the third solution can be the best solution if the axial power of the reactor core is better flattened while the transmutation performance is pursued.
According to transmutation rods, loading additions6The research idea of the LiD transmutation rod, changing the tube wall thickness and axial inhomogeneous homogenization of the transmutation rod is to compare the transmutation rates of partial research schemes to prepare the transmutation performance of different schemes in a table 5 and the transmutation effect of partial schemes in a table 6, wherein the tube wall thickness adopted by the axial inhomogeneous scheme is also 0.1 cm. It can be seen that the total transmutation rate of MA nuclide can be increased by making the transmutation rod into hollow transmutation tube or making non-uniform design in axial direction6The total transmutation rate of the MA nuclide can be improved by more than 10% by changing the solid transmutation rod with the LiD: MA ratio of 1:9 into an axial nonuniform scheme of two or three (the thickness of the tube wall is 0.1 cm).
Figure BDA0003182765720000171
Figure BDA0003182765720000172
According to the situation that the transmutation rate is along with the thickness of the tube wall, the trend that the spatial self-screen effect influences the change of the transmutation rate is obvious, namely the total transmutation rate is higher as the tube wall is thinner, and according to the actual transmutation situation,the total amount of MA loaded increases with increasing wall thickness of the tube, so that6An example of a transmutation rod protocol with a wall thickness of 0.05cm at 1:9 (LiD: MA) is 0.4096cm in outside diameter, 0.3596cm in inside diameter, and a transmutation material density of 10.3g/cm3The length of the transmutation rods is 365.76cm, and the mass share of the MA nuclides is 0.04972, so that the total mass of the MA nuclides in each transmutation rod is as follows:
π×(0.40962-0.35962)×365.76×10.3×0.04972＝22.63204g
the total mass of MA in the reactor core is as follows:
22.63204×1536/1000＝34.75998kg
the total reactor core MA transmutation quality after 540 days of transmutation is as follows:
34.75998×57.83％＝20.10219kg
and the ordinary pressurized water reactors generate about 25.166kg of MA nuclides every year, the total amount of the MA nuclides which can be transmuted under the scheme is less than the annual output of the MA nuclides of one ordinary pressurized water reactor, but if the wall thickness of the tube wall is increased to 0.2cm and the axial non-uniform scheme II is adopted, about 47kg of the MA nuclides can be transmuted, the transmutation total amount achieved by the scheme is close to the annual output of the MA nuclides of two ordinary pressurized water reactors, and the transmutation effect is obviously improved.
The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor with which the invention may be practiced, and further modifications may readily be effected therein by those skilled in the art, without departing from the general concept as defined by the claims and their equivalents, which are not limited to the details given herein and the examples shown and described herein.

Claims (8)

1. A non-uniform tubular MA transmutation rod with a function of flattening axial power of a reactor core, which is characterized by comprising:
a central layer, which is positioned at the center of the heterogeneous tubular MA transmutation rod,the outside of the central layer is provided with6LiD/MA/UO2Mixed fuel layer, said6LiD/MA/UO2An air gap layer is arranged outside the mixed fuel layer, and a zirconium alloy cladding is arranged outside the air gap layer;
the non-uniform tubular MA transmutation rod is provided with odd sections in the axial direction6LiD/MA/UO2Mixed fuel layer, and two adjacent sections6LiD/MA/UO2The mass shares of MA nuclides in the mixed fuel layer are different from the upper end to the middle position of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer increases gradually section by section; from the middle position to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer decreases section by section.
2. The non-uniform tubular MA transmutation rod with a flattened core axial power function as claimed in claim 1, wherein the central layer is a solid structure or a hollow void structure.
3. The non-uniform tube MA transmutation rod with the function of flattening the axial power of the core as claimed in claim 1, wherein the non-uniform tube MA transmutation rod is provided with three sections in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer and third stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel layer and third stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 1% -3%, and the second stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
4. The non-uniform tube with axial power function of flattening core of claim 1The MA transmutation rod is characterized in that the non-uniform tubular MA transmutation rod is provided with five sections in the axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer, third stage6LiD/MA/UO2Mixed fuel layer, fourth stage6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 1%, and the second stage6LiD/MA/UO2Mixed fuel bed and fourth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 3%, and the third stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
5. The non-uniform tube MA transmutation rod with a function of flattening axial power of a core of claim 1, wherein the non-uniform tube MA transmutation rod is provided with seven sections in an axial direction6LiD/MA/UO2The mixed fuel layer is marked as a first section from the upper end to the lower end of the non-uniform tubular MA transmutation rod6LiD/MA/UO2Mixed fuel layer, second stage6LiD/MA/UO2Mixed fuel layer, third stage6LiD/MA/UO2Mixed fuel layer, fourth stage6LiD/MA/UO2Mixed fuel layer, fifth stage6LiD/MA/UO2Mixed fuel layer, sixth stage6LiD/MA/UO2Mixed fuel bed and seventh stage6LiD/MA/UO2Mixed fuel bed, first section thereof6LiD/MA/UO2Mixed fuel bed and seventh stage6LiD/MA/UO2The ratio of MA nuclide in the mixed fuel layer is 0%, and the second stage6LiD/MA/UO2Mixed fuel bed and sixth stage6LiD/MA/UO2MA nuclide portion in mixed fuel layerRatio of 1%, third stage6LiD/MA/UO2Mixed fuel bed and fifth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 3%, and the fourth stage6LiD/MA/UO2The proportion of MA nuclide in the mixed fuel layer is 5%,6the mass ratio of LiD to MA nuclides is fixed at 1: 9.
6. The non-uniform tubular MA transmutation rod with a function of flattening axial power of a core as claimed in claim 1, wherein the said rod is characterized in that6LiD/MA/UO2The composition of the MA nuclide in the mixed fuel layer comprises237Np、241Am、243Am, and244cm, wherein237The mass ratio of Np is 56.36%,241am accounts for 26.48 percent by mass,243am accounts for 12.03 percent by mass,244cm accounts for 5.12% of the total mass.
7. The non-uniform tube type MA transmutation rod with the function of flattening the axial power of the core as claimed in claim 1, wherein the center positions of the fuel assembly in the x-axis direction and the y-axis direction are respectively loaded with 2 non-uniform tube type MA transmutation rods, and the four corners of the fuel assembly are respectively loaded with 3 non-uniform tube type MA transmutation rods, namely 16 non-uniform tube type MA transmutation rods are loaded in one fuel assembly; 36 groups of fuel assemblies with the fuel enrichment degree of 3.1 percent are loaded in the reactor core close to the central position, and 60 groups of fuel assemblies with the fuel enrichment degree of 3.1 percent are loaded in the reactor core except the central position, namely 1536 non-uniform tubular MA transmutation rods are loaded in one reactor core.
8. The non-uniform tubular MA transmutation rod with the function of flattening the axial power of the core as claimed in claim 1, wherein the wall thickness of the non-uniform tubular MA transmutation rod is 0.05cm to 0.3 cm.
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