Reactor core test bench, arrangement method and system of electric heating rod power partitions, and electronic equipment

Abstract

The invention discloses a reactor core test bench, an electric heating rod power partition arrangement method and system, and electronic equipment, and belongs to the technical field of reactor core test analysis. The arrangement method comprises the following steps: acquiring design parameters of electric heating rods of a test bench, wherein the design parameters comprise the total number, the diameter and the center distance between adjacent rods; according to the total number of the electric heating rods, the corresponding shapes and the rod number of the three subareas under radial power distribution are determined; determining radial power peak factors corresponding to the three subareas according to design parameters, the rod numbers corresponding to the three subareas and a critical heat flux CHF number similarity criterion; determining partition power corresponding to the three partitions according to the radial power peak factor; axial power peak factors corresponding to the three partitions are determined to determine an axial power distribution. According to the method, the problem that a test bed in the prior art cannot simulate the uneven distribution characteristics of the axial power and the radial power of an actual reactor core can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of core test analysis, and in particular relates to a core test bench, a method and system for arranging power partitions of electric heating rods, and electronic equipment. Background Art

[0002] The core is the core component of the reactor. Nuclear fuel realizes chain fission reaction in the core, releasing nuclear energy and converting nuclear energy into heat energy. At the same time, the core is also a high-temperature heat source and a strong radiation source. Taking a pressurized water reactor as an example, the core is composed of 157 fuel assemblies of the same size and square cross-section. When the core is first loaded, there are three different 235 The U-enriched fuel assemblies are 1.8%, 2.4% and 3.1% respectively. The core neutron injection rate shows a distribution of high in the middle and low outside along the radial direction. In order to make full use of nuclear fuel and improve the average power density of the core, the nuclear fuel is loaded in different zones according to different fuel enrichments and the fuel cycle mode of partial refueling is adopted. Zone loading method: In the outer area of ​​the core, 52 fuel assemblies with an enrichment of 3.1% form the third zone, and in the inner area, 52 fuel assemblies with an enrichment of 2.4% and 53 fuel assemblies with an enrichment of 1.8% are mixed and staggered to form the second zone and the first zone respectively. The traditional three-zone partial refueling method: During the refueling stage, the spent fuel assemblies in the first zone are unloaded, the peripheral assemblies are switched to the inner area, and the newly added fuel assemblies are placed in the outermost third zone. This refueling method can flatten the core power distribution, obtain a higher burnup depth, and improve the utilization rate of nuclear fuel.

[0003] The heat source of the core comes from the huge energy released during nuclear fission. The average total energy released by each fission is 200 MeV. More than 90% of the total fission energy is converted into heat energy in the fuel elements, about 5% of the total fission energy is converted into heat energy in the moderator, and the remaining 5% of the total fission energy is converted into heat energy in the reflector, heat shield and other components. In the design of pressurized water reactors, most of the fission energy is converted into heat energy in the fuel elements, and the removal of heat from the fuel elements is the key to the design of thermal hydraulic problems in the reactor core. During the stable operation of the reactor, the heat release rate q of the nuclear fuel per unit volume in the core is v satisfy

[0004] q v =0.97Φσ f NE f (1)

[0005] where σ f is the fission cross section, N is the number of neutrons per unit volume, E f is the single fission energy, due to σ f 、E fis a constant, Φ is the neutron fluence rate distribution, and N changes little in a short period of time. Therefore, the heat release rate distribution of the nuclear fuel at a certain moment is consistent with the neutron fluence rate distribution.

[0006] For a cylindrical core, if the fuel is uniformly distributed in the core, the neutron flux rate distribution in the radial direction is a Bessel function, and in the axial direction is a cosine function, as shown in formula (2):

[0007]

[0008] In formula (2), R e and L e are the extrapolated radius and extrapolated height of the core, Φ 0 is the neutron injection rate at the origin. However, the above formula cannot accurately reflect the actual radial distribution of the neutron injection rate in the reactor core. The nuclear fuel of the pressurized water reactor of a large nuclear power plant adopts a non-uniform partition loading scheme, such as the three-zone loading method, which can flatten the radial power distribution and avoid the high power peak in the center area.

[0009] The actual reactor core assembly layout is as follows Figure 1 As shown in the figure, different colored areas are used to distinguish fuel assemblies (first area, second area and third area) of different powers and control rod assembly areas, and each assembly contains 17*17 rod positions.

[0010] Referring to the reactor fuel partition scheme, there are difficulties in setting up the core simulation body (electric heating rod bundle) in the reactor integral test bench. In the reactor integral test bench that has been built, a scheme of simulating a group of fuel assemblies with an electric heating rod is adopted, and the control rod assembly is not set in the core simulation body. In the process of proportional modeling from the actual reactor to the integral test bench, it is necessary to ensure that the cross-sectional area of ​​the flow channel between the rod bundle gaps meets the requirements of proportional scaling. This puts forward higher design requirements for the design of the electric heating rod bundle, including the number, diameter, partition scheme, radial power configuration scheme, etc.

[0011] Another example Figure 2 As shown in Figure 2, the actual radial power distribution and inlet flow distribution of the reactor core are described. Figure 2 The origin o in the upper left corner is the center of the core. The closer the normalized radial power distribution factor is to the center, the higher the power is, and vice versa, which is in line with the fuel zoning layout idea. The closer to the center, the lower the normalized inlet flow rate is, and vice versa, the higher it is. This is because the core thermal calculation takes a conservative assumption, that is, the flow rate in the hottest area of ​​the core is set low, and the highest temperature that can be achieved can still meet the limit below the maximum temperature of the core.

[0012] Another example Figure 3The figure shows the actual axial power distribution of the fuel rods in the reactor core. When the presence of xenon poisoning is not considered, the axial power distribution presents a nearly cosine distribution that is uniform and symmetrical along the core height direction. As the core operation burnup increases, xenon poisoning accumulates in the upper or lower half of the core, and the axial normalized power of the fuel rods will show a "peak" along the height direction. Figure 3 For example, the red curve with mid-xenon biased toward the bottom corresponds to the maximum fuel rod power density in the middle area of ​​the core (e.g. Figure 3 The vertical axis at the middle peak is about 1.6), while the corresponding core top and bottom areas have the lowest power (e.g. Figure 3 The vertical axis corresponding to the two ends of the curve where xenon is biased toward the bottom is approximately 0.2).

[0013] In addition, in the event of an accidental shutdown, the remaining decay heat power in the reactor needs to be discharged through the residual heat removal system. This is an important feature that distinguishes nuclear reactors from other energy structures. The smooth discharge of residual heat in the reactor is also the key to ensuring reactor safety.

[0014] The integral test bench is a test device used to study the overall effects of various thermal-hydraulic phenomena in reactors under accident conditions. It is obtained by proportional modeling of the prototype power plant model. It is necessary to simulate the prototype reactor structure and thermal-hydraulic parameters as realistically as possible. The cooling process after shutdown is also the focus of the integral test bench research.

[0015] The core thermal simulation of the overall test bench is the key to the study of thermal hydraulic problems. The test bench design uses electric heating to simulate nuclear heat release. According to the relationship between the residual power and time after the reactor is shut down, the power value required for the overall test bench is given. This power value provides the conditions for using a few electric heating rods to simulate fuel rods, that is, one heating rod simulates a box of fuel assemblies. The heating power after simulation is consistent with the residual heat power level after the reactor is shut down, meeting the design requirements.

[0016] The design of using one heating rod to simulate a box of fuel assemblies ensures the similarity of the core geometry, which is conducive to the overall design and similarity of the test bench. In addition, it is necessary to ensure that the area occupied by the electric heating rod and the area occupied by the fuel assembly meet the requirements of proportional modeling, so that the cooling channel area remains similar to the prototype.

[0017] Due to the nuclear physics heat generation mechanism, the core power has the characteristics of axial and radial uneven distribution. The core radial power distribution is designed as a three-zone layout. Although there are existing technologies such as Figure 1 The three-zone layout is shown, but in the process of proportional modeling of the overall test bench, it is necessary to ensure that the cross-sectional area of ​​the flow channel between the gaps of the electric heating rod bundles meets the requirements of proportional design. This puts forward higher design requirements for the design of the electric heating rod bundles (number, diameter, partition scheme, radial power, etc.), which is more in line with the requirements of thermal engineering similar to the core simulation body.

[0018] Prototype core partition scheme (such as Figure 1 The control rod vacancy reservation (black area) and the simplicity of the actual dumping process ( Figure 1 The comprehensive solution obtained by the third zone in the middle envelops the black control rod zone and the second zone) will cause the following problems if it is directly applied to the core simulation body of the reactor integral test bench: the existence of the reserved flow channel at the control rod position will cause the local flow rate in the flow channel to be too large, the coolant will cool the electric heating rods around the flow channel too strongly, the power peak will be discontinuous along the radial direction, and the conservative margin of the hot spot limit of the electric heating rod will increase, that is, the economic efficiency of the heat generated by the electric energy used to heat the electric heating rod will be reduced.

[0019] Therefore, a method for arranging power zones of electric heating rods in a core test bench is urgently needed, so that the arranged test bench has consistent axial power and radial power uneven distribution characteristics with the actual core, and ensures that the cross-sectional area of ​​the flow channel between the rod bundle gaps meets the requirements of proportional scaling. Summary of the invention

[0020] The technical problem to be solved by the present invention is to provide a core test bench, a method and system for arranging power zones of electric heating rods, and electronic equipment in view of the above-mentioned deficiencies in the prior art, so that the test bench can have consistent axial power and radial power uneven distribution characteristics with the actual core, and ensure that the cross-sectional area of ​​the flow channel between the rod bundle gaps meets the requirements of proportional scaling.

[0021] In a first aspect, the present invention provides a method for arranging power zones of electric heating rods of a core test bench, comprising: obtaining design parameters of the electric heating rods of the test bench, wherein the design parameters include the total number, diameter, and center distance between adjacent rods; determining the shapes and number of rods corresponding to three zones under radial power distribution according to the total number of electric heating rods; determining the radial power peak factors corresponding to the three zones according to the design parameters and the number of rods corresponding to the three zones and the critical heat flux density CHF number similarity criterion; determining the zone powers corresponding to the three zones according to the radial power peak factors; and determining the axial power peak factors corresponding to the three zones to determine the axial power distribution.

[0022] Preferably, the obtaining of the design parameters of the electric heating rods of the test bench specifically includes: calculating the diameter range of the electric heating rods according to the total number of the electric heating rods, the height-to-diameter ratio range, and the fuel rod cross-sectional area reduction ratio; calculating the ratio range of the center distance between adjacent electric heating rods to the diameter of the electric heating rods according to the effective flow area between adjacent electric heating rods and the design reduction ratio of the prototype core; and determining the center distance between adjacent rods according to the ratio range and the diameter range of the electric heating rods.

[0023] Preferably, the three sub-areas include a first area, a second area, and a third area. The shapes and numbers of the three sub-areas corresponding to the radial power distribution are determined according to the total number of electric heating rods, specifically including: according to the total number of electric heating rods, the first area under the radial power distribution is determined to be located at the center and is a square, the second area is an octagon, and the third area is an irregular polygon, and the three sub-areas have a common center point, the numbers of electric heating rods from the first area to the third area are arranged in ascending order, and the second area and the third area have an array of electric heating rods with the same number of layers.

[0024] Preferably, the radial power peak factors corresponding to the three partitions are determined according to the design parameters and the number of rods corresponding to the three partitions and the critical heat flux density CHF number similarity criterion, specifically including: substituting the design parameters and the number of rods corresponding to the three partitions into the CHF number similarity criterion and the heat rod design criterion to calculate the heat pipe peak factors corresponding to the three partitions; and determining the heat pipe peak factor as the radial power peak factor.

[0025] Preferably, the CHF number similarity criterion satisfies:

[0026]

[0027] Among them, CHF,R is the CHF number similarity criterion, q″ C ″ RIT is the critical heat flow relationship of two-phase natural circulation at low flow rate, q″ c ″ ,ROD is the heat flux of the electric heating rod, m is the test bench, p is the prototype reactor, and R is the ratio of the test bench to the prototype core.

[0028] Preferably, determining the corresponding partition powers of the three partitions according to the radial power peak factor specifically includes: determining the average power of a single electric heating rod according to the total power of the prototype core and the total number; calculating the corresponding single-rod maximum powers of the three partitions according to the radial power peak factor and the single-rod average power; determining the corresponding partition powers of the three partitions according to the corresponding single-rod maximum powers and the number of rods of the three partitions.

[0029] Preferably, the determining of the corresponding axial power peak factors of the three partitions specifically includes: obtaining a polynomial relationship of axial normalized power distribution according to the axial power distribution curve of the prototype core fuel assembly by fitting:

[0030] P a =f×(Ah 5 +Bh 4 +Ch 3 +Dh 2 +Eh+F),

[0031] Among them, P a$P$ is the axial normalized power of the electric heating rod, $f$ is the adjustment factor, $h$ is the non-dimensional height of the prototype core in the axial direction, where $0 < h < 1$, $61 < A < 64$, $-177 < B < -171$, $164 < C < 170$, $-72 < D < -66$, $11 < E < 17$, $2.0 < F < 2.5$, $0.97 < f < 0.99$; the axial power peak factors corresponding to the three zones are determined according to the multiple relational expressions.

[0032] Preferably, the arrangement method further includes: simulating the axial non-uniform power distribution of the fuel assemblies of the prototype core based on the way of discrete series connection of resistance segments.

[0033] Preferably, the total number is 177, and the numbers of electric heating rods in the first zone to the third zone are 9, 60, and 108 respectively. The ranges of the radial power peak factors corresponding to the three zones are 1.50 - 1.56, 1.21 - 1.27, and 0.79 - 0.85 respectively. The ranges of the axial power peak factors corresponding to the three zones are all 1.5 - 1.7. The maximum values of the maximum power of a single rod corresponding to the three zones are 44, 35, and 23 respectively. The ranges of the zone powers corresponding to the three zones are 233.39 - 388.98, 1261.02 - 2101.7, and 1500 - 2500 respectively.

[0034] In a second aspect, the present invention further provides an arrangement system for power zoning of electric heating rods of a core test bench, including:

[0035] An acquisition module, configured to acquire the design parameters of the electric heating rods of the test bench, where the design parameters include the total number, diameter, and center distance between adjacent rods, and the total number is the same as the total number of fuel assemblies of the prototype core.

[0036] A determination module, connected to the acquisition module, configured to determine the shapes and the numbers of rods corresponding to the three zones under the radial power distribution according to the total number of the electric heating rods, and further configured to determine the radial power peak factors corresponding to the three zones according to the design parameters, the numbers of rods corresponding to the three zones, and the critical heat flux density CHF number similarity criterion, and determine the zone powers corresponding to the three zones according to the radial power peak factors, and also configured to determine the axial power peak factors corresponding to the three zones to determine the axial power distribution.

[0037] In a third aspect, the present invention further provides an electronic device, including: a memory and a processor, which are communicatively connected to each other, where the memory stores computer instructions, and the processor executes the computer instructions to execute the arrangement method for power zoning of electric heating rods of the core test bench described in the first aspect.

[0038] In a fourth aspect, the present invention further provides a core test bench, comprising a plurality of electric heating rods, wherein the plurality of electric heating rods are used for power partitioning arrangement according to the method for arranging power partitions of electric heating rods of a core test bench described in the first aspect.

[0039] Preferably, each electric heating rod comprises M resistors, and the M resistors are connected in series to lead out power supply wires, and 20≤M≤40.

[0040] The present invention provides a method and system for arranging power partitions of electric heating rods of a core test bench, an electronic device, and a core test bench. The shapes and number of rods of the three partitions under the radial power distribution are determined according to the design parameters of the electric heating rods of the test bench, and then the radial power peak factor, partition power, and axial power peak factor corresponding to the three partitions are determined. Based on the design parameters, it is ensured that the cross-sectional area of ​​the flow channel meets the requirements of the reduction ratio; based on the shapes and number of rods of the three partitions, and using the radial power peak factor and partition power determined by the CHF number similarity criterion, not only the similarity of each partition in thermal conditions is ensured, the heat flow characteristics of the actual core are simulated when the core is heated up, but also the radial power non-uniformity can be accurately simulated; based on the axial power peak factor, the axial power distribution can be controlled to simulate the non-uniform axial power distribution of the actual core. Thereby, the test bench and the actual core have consistent axial power and radial power non-uniform distribution characteristics, and it is ensured that the cross-sectional area of ​​the flow channel between the rod bundle gaps meets the requirements of the proportional reduction ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of a reactor core arrangement of Example 1 of the present invention;

[0042] Figure 2 It is a schematic diagram of radial power distribution and inlet flow distribution of the reactor core (1 / 8 core) of Example 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of the axial power distribution of the core fuel rods of Example 1 of the present invention;

[0044] Figure 4 This is a flow chart of a method for arranging power zones of electric heating rods of a core test bench according to Example 1 of the present invention;

[0045] Figure 5 This is a schematic diagram of the partition loading of electric heating rods on a test bench according to Example 1 of the present invention;

[0046] Figure 6 This is a schematic diagram of a core axial power distribution curve of Example 1 of the present invention;

[0047] Figure 7 This is a schematic diagram of axial distributed resistance control of an electric heating rod according to Example 1 of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the technical solution of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] It should be understood that the specific embodiments and drawings described herein are only used to explain the present invention rather than to limit the present invention.

[0050] It can be understood that, in the absence of conflict, the various embodiments of the present invention and the various features in the embodiments can be combined with each other.

[0051] It can be understood that, for the convenience of description, the drawings of the present invention only show the parts related to the present invention, while the parts irrelevant to the present invention are not shown in the drawings.

[0052] It can be understood that each unit and module involved in the embodiments of the present invention may correspond to only one physical structure, or may be composed of multiple physical structures, or multiple units and modules may be integrated into one physical structure.

[0053] It can be understood that, without conflict, the functions and steps marked in the flowcharts and block diagrams of the present invention may occur in an order different from that marked in the drawings.

[0054] It is understood that the flowcharts and block diagrams of the present invention illustrate the possible architectures, functions, and operations of the systems, devices, equipment, and methods according to the various embodiments of the present invention. Each box in the flowchart or block diagram may represent a unit, module, program segment, or code, which contains executable instructions for implementing the specified functions. Moreover, each box or combination of boxes in the block diagram and flowchart may be implemented by a hardware-based system that implements the specified functions, or may be implemented by a combination of hardware and computer instructions.

[0055] It can be understood that the units and modules involved in the embodiments of the present invention can be implemented by software or hardware. For example, the units and modules can be located in a processor.

[0056] Embodiment 1:

[0057] like Figure 4 As shown, this embodiment provides a method for arranging power zones of electric heating rods of a core test bench, which is applied to a reactor. The arrangement method includes:

[0058] Step 101, obtaining design parameters of the electric heating rods of the test bench, wherein the design parameters include the total number, diameter, and center distance between adjacent rods.

[0059] Step 102: determine the corresponding shapes and numbers of the three subareas under the radial power distribution according to the total number of electric heating rods.

[0060] Step 103, determining the radial power peak factors corresponding to the three partitions according to the design parameters and the similarity criterion of the number of rods and the critical heat flux CHF number corresponding to the three partitions.

[0061] Step 104: determine the corresponding partition powers of the three partitions according to the radial power peak factor.

[0062] Step 105 , determining the corresponding axial power peak factors of the three partitions to determine the axial power distribution.

[0063] In this embodiment, the design parameters of the electric heating rod of the test bench are obtained by scaling down the design size parameters of the prototype core through proportional modeling. On the basis of satisfying the similarity criterion of thermal phenomena, different design parameters have corresponding reduction ratios. The design parameters of the electric heating rod include the total number of electric heating rods, the diameter of the electric heating rod, the length of the electric heating rod, the center distance between adjacent rods, etc. The design basis of the design parameters includes: the core flow area meets the area ratio, the heating section length meets the height ratio, the sub-channel geometry is similar, and the sub-channel flow area accounts for a similar ratio of the total fluid flow area of ​​the core. Obtaining the design parameters of the electric heating rod of the test bench includes the following methods: receiving the design parameters of the electric heating rod input by the user, or calculating the design parameters of the electric heating rod of the test bench according to the total number, height-to-diameter ratio, fuel rod cross-sectional area reduction ratio, effective flow area between adjacent rods of the electric heating rod and the prototype core design reduction ratio input by the user. Since the actual core of the reactor has a control rod assembly and the test bench is not provided with a control rod assembly, the test bench needs to ensure that the cross-sectional area of ​​the flow channel between the gaps of the rod bundles meets the requirements of proportional reduction, so it is necessary to determine the corresponding shapes and number of rods of the three partitions under the radial power distribution according to the total number of electric heating rods, so as to facilitate the subsequent determination of the radial power peak factor, partition power, and axial power peak factor of each partition, and then power the electric heating rods through the power supply to realize the test bench to simulate the power distribution characteristics of the actual core. This embodiment ensures that the cross-sectional area of ​​the flow channel meets the requirements of the reduction ratio based on the design parameters; based on the shapes and number of rods of the three partitions, and using the radial power peak factor and partition power determined by the CHF number similarity criterion, not only ensures the similarity of each partition in thermal conditions, simulates the heat flow characteristics of the actual core when heating up, but also can accurately simulate the radial power non-uniformity; based on the axial power peak factor, the axial power distribution can be controlled to simulate the non-uniform axial power distribution of the actual core. Thereby, the test bench has consistent axial power and radial power non-uniform distribution characteristics with the actual core, and ensures that the cross-sectional area of ​​the flow channel between the gaps of the rod bundles meets the requirements of proportional reduction.

[0064] In some embodiments, obtaining design parameters of the test bench electric heating rod includes:

[0065] Step 1011, calculating the diameter range of the electric heating rods according to the total number of electric heating rods, the height-to-diameter ratio range, and the fuel rod cross-sectional area reduction ratio.

[0066] Step 1012, based on the effective flow area between adjacent electric heating rods and the design scale of the prototype core, calculate the ratio range of the center distance between adjacent rods to the diameter of the electric heating rod.

[0067] Step 1013, determining the center distance between adjacent rods according to the ratio range and the diameter range of the electric heating rods.

[0068] In this embodiment, the total number of electric heating rods, the height-to-diameter ratio range, the fuel cross-sectional area reduction ratio, the effective flow area between adjacent rods and the prototype core design reduction ratio can be data set by the user according to actual conditions. Specifically, the diameter of the electric heating rod is obtained by comprehensively considering the fuel rod cross-sectional area reduction ratio, the total number and engineering feasibility. When the effective flow area between the electric heating rods meets the 1:30 reduction ratio requirement of the prototype core design, the ratio range of the center distance between adjacent electric heating rods and the heating rod diameter ratio (1.30-1.34) can be calculated, thereby determining the center distance between adjacent rods (i.e., the spacing between electric heating rods). In step 1011, with the height-to-diameter ratio range: l R / d R = 2-3 as an example, the diameter range of the electric heating rod is calculated to be 13-30mm. R is the test bench height ratio, d R is the diameter ratio, height-to-diameter ratio (l R / d R ) is determined based on the external shape of the test bench. The larger the ratio, the taller and thinner the scaled-down bench will be; on the contrary, the smaller the ratio, the shorter and fatter the shape will be. It should be noted that the height-to-diameter ratio range, the electric heating rod diameter range, the ratio range, etc. are determined based on the proportional modeling analysis process and similarity criteria. Therefore, the parameter range value in this embodiment is a layout reference range, and the parameters selected when the test bench is actually built are only a set of parameter matrices in each parameter range. In other words, selecting any data from each parameter range to form a set of parameter matrices can achieve a consistent simulation with the uneven power distribution of the actual core, and after a limited number of tests, one of the parameter matrices can be obtained, which can achieve the effect of accurately simulating the uneven power distribution of the actual core.

[0069] In some embodiments, the three partitions include a first zone, a second zone, and a third zone. The shapes and numbers of the three partitions under the radial power distribution are determined according to the total number of electric heating rods, specifically including: according to the total number of electric heating rods, the first zone under the radial power distribution is determined to be located at the center and is a square, the second zone is an octagon, and the third zone is an irregular polygon, and the three partitions have a common center point, the number of electric heating rods from the first zone to the third zone is arranged in ascending order, and the second zone and the third zone have an array of electric heating rods with the same number of layers.

[0070] In this embodiment, since the actual core adopts a non-uniform partition loading scheme, such as a three-zone loading method for flattening the radial power distribution, the electric heating rods of the test bench are also divided into three zones. One electric heating rod is used to simulate a box of fuel assemblies, but the number and shape of the electric heating rods in each zone (such as Figure 5 ) are respectively compared with the actual core (as shown in Figure 1 There are obvious differences. Figure 1 The layout of the fuel assembly flattens the radial power distribution of the core and obtains a low-leakage unloading and replacement scheme with better neutron economy. The number of fuel assemblies in the third central zone is the largest. Since the use of electric heating rods to simulate the actual core heat release is highly accurate and has the best layout adjustability, Figure 5 Except for the first hottest zone with fewer electric heating rods, the second and third zones have the same number of layers of electric heating rods arranged in an array. This more uniform layer arrangement greatly alleviates the problem of uneven thermal stress in the core simulation body (i.e., electric heating rods) during the operation of the test bench. Figure 5 As shown, there is no control rod vacancy reservation in the partition loading, the electric heating rods are evenly and closely arranged, the first zone is located in the center and is a square, the second zone is an octagon, and the third zone is an irregular polygon, and the three partitions have a common center point. The number of electric heating rods from the first zone to the third zone is arranged in ascending order, and the second zone and the third zone have the same number of layers of electric heating rods (such as Figure 5 The number of layers in the X-axis direction and the Y-axis direction are both 3).

[0071] In some embodiments, taking 177 electric heating rods (corresponding to 177 boxes of fuel assemblies) as an example, they are divided into three zones and arranged from the center to the surrounding areas. The number of rods is 9 in the first zone, 60 in the second zone, and 108 in the third zone. The electric heating rods in the first zone form a square, the outer layer of the electric heating rods in the second layer forms an octagon, and the outermost layer of the third zone forms an irregular polygon.

[0072] In some embodiments, the radial power peak factors corresponding to the three partitions are determined according to the design parameters and the number of rods and the critical heat flux CHF number similarity criterion corresponding to the three partitions, specifically including:

[0073] Step 1031, the design parameters and the corresponding numbers of rods in the three partitions are substituted into the CHF number similarity criterion and the heat rod design criterion to calculate the corresponding heat pipe peak factors in the three partitions.

[0074] Step 1032, determining the heat pipe peak factor as the radial power peak factor.

[0075] In this embodiment, the radial power peak factor is determined based on the CHF number similarity criterion, which not only ensures the similarity of the thermal conditions of each partition of the test bench with the actual core, simulates the heat flow characteristics of the actual core when heating up, but also can accurately simulate the radial power non-uniformity. The heat pipe peak factor is determined as the radial power peak factor, that is, the solved heat pipe peak factor is equivalent to the radial power peak factor.

[0076] In some embodiments, the CHF number similarity criterion satisfies:

[0077]

[0078] Among them, CHF,R is the CHF number similarity criterion, q″ CRIT is the critical heat flux relationship for low velocity two-phase natural circulation proposed by Katto, q″ c,ROD is the heat flux of the electric heating rod, m is the test bench, p is the prototype reactor, and R is the ratio of the test bench to the prototype core.

[0079] in,

[0080]

[0081] G c is the mass flow rate through the core, σ is the surface tension, d h,c is the hydraulic diameter of the sub-channel, and for the electric heating rods arranged in a square:

[0082]

[0083] Where s is the center distance between adjacent rods, d is the diameter, is the total core power.

[0084] Substituting formula (4), (5), and (6) into formula (3), we get:

[0085]

[0086] In the formula, m is the test bench, p is the prototype reactor, R is the ratio of the test bench to the prototype core, c is the core, N is the number of electric heating rods or sub-channels, and F is q is the heat pipe peak factor, l c is the core length, h sub is the supercooling enthalpy, hlg is the latent heat of vaporization, ρ ls is the saturated liquid density.

[0087] In this embodiment, the radial power peak factor of different partitions can be determined based on the design parameters of the electric heating rod and the CHF number similarity criterion. Specifically, in addition to meeting the geometric requirements of the electric heating rod (such as the number of rods, diameter, and center distance between adjacent rods in the partition), the electric heating rod also needs to meet the requirements of the CHF number similarity criterion (i.e., formula (3)). Based on the determined design parameters of the electric heating rod, on the premise of ensuring that the CHF number meets the requirements, the radial power peak factor (p r,1 ,p r,2 ,p r,3 ).

[0088] In some embodiments, determining the partition powers corresponding to the three partitions according to the radial power peak factor specifically includes:

[0089] Step 1041, determine the average power of a single electric heating rod according to the total power and total number of the prototype core.

[0090] Step 1042: Calculate the corresponding single-rod maximum powers of the three partitions according to the radial power peak factor and the single-rod average power.

[0091] Step 1043: Determine the corresponding partition powers of the three partitions according to the corresponding single-rod maximum powers and the number of rods of the three partitions.

[0092] In some embodiments, determining the average power of a single electric heating rod based on the total power and total number of the prototype core includes: calculating the total power requirement of the electric heating rods of the core test bench based on the total power of the prototype core; dividing the total power requirement of the electric heating rods by the total number of electric heating rods to obtain the average power of a single electric heating rod.

[0093] In some embodiments, calculating the corresponding single-rod maximum powers of the three partitions according to the radial power peak factor and the single-rod average power includes: multiplying the corresponding radial power peak factors of the three partitions by the single-rod average power to obtain the corresponding single-rod maximum powers of the three partitions.

[0094] In some embodiments, according to the single rod maximum power and the number of rods corresponding to the three partitions, determining the partition power corresponding to the three partitions includes: multiplying the single rod maximum power corresponding to the three partitions by the number of rods respectively to obtain the partition power corresponding to the three partitions. The number of rods refers to the number of electric heating rods.

[0095] In some embodiments, the single-rod average power and the single-rod maximum power can also be calculated in the following manner: according to the on-site electrical conditions, the DC voltage is divided into two groups to supply power to the electric heating rods, one group of voltages is used to supply power to the electric heating rods in the first zone and the second zone, and the other group of power supplies is used to supply power to the electric heating rods in the third zone, that is:

[0096] P 1 +P 2 =P 3 =P / 2 (8)

[0097] Among them, P 1 , P 2 are the power of the first and second zones respectively, P 3 is the power of the third zone, P is the total power requirement of the electric heating rod, then the average power of a single rod is:

[0098]

[0099] in, is the average power of a single rod in the nth zone, N 1 、N 2 、N 3 The numbers of rods in the first zone, second zone, and third zone respectively.

[0100] When there are different P, the maximum power of a single rod in different partitions is:

[0101]

[0102] Among them, p r,1 、p r,2 、p r,3 They are the radial power peak factors of the first zone, the second zone, and the third zone respectively.

[0103] In some embodiments, determining the axial power peak factors corresponding to the three partitions specifically includes:

[0104] Step 1051, obtain a polynomial relationship of axial normalized power distribution according to the axial power distribution curve of the prototype core fuel assembly:

[0105] P a =f×(Ah 5 + Bh 4 + Ch 3 + Dh 2 + Eh+ F), (11)

[0106] Among them, P a is the normalized axial power of the electric heating rod, f is the adjustment factor, h is the dimensionless axial height of the prototype core, <h<1,61<A<64,-177<B<-171,164<C<170,-72<D<-66,11<E<17,2.0<F<2.5,0.97<f<0.99;

[0107] Step 1052: determine the corresponding axial power peak factors of the three partitions according to the polynomial relationship.

[0108] In this embodiment, based on the axial power distribution curve of the prototype core fuel rod (xenon is biased towards the bottom), the curve shape is fitted as follows: Figure 6 Curve; The axial normalized power distribution obtained by fitting satisfies the polynomial relationship (11) with the highest term being five times, and the curve fitting coefficients A, B, C, D, E, and F respectively satisfy the following ranges:

[0109] 61 <A<64;-177<B<-171;164<C<170;

[0110] -72 <D<-66;11<E<17;2.0<F<2.5;

[0111] Among them, the curve fitting coefficient gives a parameter range, which expands the protection range of considering the difference of xenon peak deviation in different fuel zones. In practice, when the power of the electric heating rod is limited, the curve fitting coefficient can be adaptively adjusted as follows: when the axial power peak factor is limited, the fitting curve peak can be changed by adjusting the factor f.

[0112] In conventional design, f = 1; when considering the axial power peak factor limit, that is, f = 0.97-0.99 (interval value) in the peak pressure design, combined with Figure 6 Get the axial power peak factor p a,1 =p a,2 =p a,3 (The vertical coordinate value corresponding to the highest point of curve 6, the range is adjusted according to the actual situation); At the same time, considering the difference of xenon peak deviation between different areas of the three fuel zones, the range intervals satisfied by the curve fitting coefficients A, B, C, D, E, and F are given. The pressure peak design can reduce the maximum power of a single rod and avoid damage to the electric heating rod due to excessive temperature, thereby improving the safety and reliability of the test bench. Due to the possibility of exposed working conditions in the upper part of the core such as LOCA accidents, the axial power adopts a non-uniform distribution layout scheme with a peak deviation. This hump-shaped power distribution biased to the upper part (i.e., xenon is biased to the bottom) is more enveloping. Therefore, in this embodiment, the axial power distribution can be controlled based on the axial power peak factor to simulate the uneven axial power distribution of the actual core. In a specific embodiment, A=63.37, B=-174.66, C=166.99, D=-69.26, and E=14.33.

[0113] In some embodiments, the arrangement method further includes: simulating the axial non-uniform power distribution of the prototype core fuel assembly based on a piecewise discrete series connection of resistors.

[0114] In this embodiment, in order to realize the processing and manufacturing of electric heating rods with more accurate axial power distribution curve, higher technical requirements are put forward for the control of axial resistance of the electric heating rods. At the same time, it is also necessary to meet the requirement of radial power arrangement in three zones to achieve the power ratio of different zones (i.e., power peak factor). A piecewise discrete design of resistance is adopted to realize a more accurate fitting of the normalized power distribution curve of the axial non-uniform distribution of the electric heating rod. The heating length is divided into discrete ways of L / 20-L / 40, where L is the length of the core heating section. The actual electric heating rod adopts a discontinuous power distribution. Processing and manufacturing experience suggests that at least 20 equal segmentation requirements are met. Figure 7 As shown in the figure, there are 20-40 resistors in series in the heating section of the electric heating rod, and power supply wires are led out from both ends to connect to the power supply. By evenly dividing the heating section, the axial power of the electric heating rod can be more accurately controlled, so that the axial power distribution is consistent with Figure 6 The curve shown is more fitting, so that the electric heating rod of the test bench can accurately simulate the axial power distribution of the actual core.

[0115] In some embodiments, the total number is 177, and the number of electric heating rods in the first zone to the third zone is 9, 60, and 108, respectively. The ranges of the radial power peak factors of the three partitions are 1.50-1.56, 1.21-1.27, and 0.79-0.85, respectively. The ranges of the axial power peak factors of the three partitions are all 1.5-1.7. The maximum values ​​of the single rod maximum power of the three partitions are 44, 35, and 23, respectively. The ranges of the partition power of the three partitions are 233.39-388.98, 1261.02-2101.7, and 1500-2500, respectively.

[0116] In this embodiment, taking 177 electric heating rods as an example, according to the total power of the prototype core (2400-4000MW) and the power reduction ratio requirement of the test bench (for example, 1:52) and 6.5% decay heat power (considering that the purpose of the test bench layout is to study the safety system response after shutdown, the design power of the test bench is too high, which will cause the design temperature of the electric heating rod to exceed the limit value. Therefore, the design power of the test bench is considered from the decay heat release after shutdown, and the maximum power is designed to be the decay heat power after shutdown, that is, 6.5% of the total thermal power), the total power demand of the core heating rod is 3000-5000kW. According to the total number of 177 electric heating rods, the heating rod partition power is shown in Table 1.

[0117] Table 1 Electric heating rod power partition table (sample data are the same as the protection range interval)

[0118]

[0119] In this embodiment, the sum of the powers of the first zone and the second zone is equal to the sum of the powers of the third zone, that is, the DC power supply can be divided into two groups to supply power to the electric heating rods, one of which is for the heating rods in the first zone and the second zone, and the other is for the heating rods in the third zone. This method is convenient for power supply. In summary, this embodiment proposes a method for rapid power zoning layout of an electric heating rod simulation body based on electrical conditions. This method proposes in detail the design ideas and zoning of the zoning layout of the reactor overall test bench, involving the calculation and solution process of parameters such as the number of rods arranged in three zones of the total electric power of the electric heating rod bundle, the radial power peak factor, and the axial power peak factor. The calculation ideas are clear and the calculation process is simple and efficient. Moreover, the layout method of this embodiment can be executed by a computer to obtain the layout results, which is more efficient and accurate than manual calculation, and avoids accuracy problems caused by differences in personnel experience. It should be noted that when the total power P is above or below the range of Table 1, in order to ensure the similarity criterion and the proportional modeling relationship between the test bench core simulation body and the prototype core, while ensuring Figure 5 Under the premise that the number of partitions (i.e. three partitions) remains unchanged, the partition layout of the electric heating rods must meet the requirements of similar shapes and the same number ratio.

[0120] In a specific embodiment, the power partitioning results of the electric heating rod are shown in Table 2:

[0121] Table 2 Example of power partitioning of electric heating rods

[0122]

[0123] The arrangement method of the power partition of the electric heating rod of the core test bench of this embodiment ensures that the cross-sectional area of ​​the flow channel meets the requirements of the reduction ratio based on the design parameters; based on the shape and number of rods of the three partitions, and using the radial power peak factor and partition power determined by the CHF number similarity criterion, not only ensures the similarity of each partition in thermal conditions, simulates the heat flow characteristics of the actual core when heating up, but also can accurately simulate the radial power non-uniformity; based on the axial power peak factor, the axial power distribution can be controlled to simulate the axial power non-uniform distribution of the actual core. Thereby, the test bench and the actual core have the same axial power and radial power non-uniform distribution characteristics, and ensure that the cross-sectional area of ​​the flow channel between the rod bundle gaps meets the requirements of the proportional reduction ratio. In addition, in order to simulate the uneven axial and radial power distribution of the reactor core, this embodiment uses three kinds of electric heating rods of power to simulate the non-uniform distribution of radial power, and simulates the axial non-uniform power distribution of the fuel assembly by the axial non-uniform distribution segmented resistance fitting method. The layout of the electric heating rods is consistent with that of the fuel assembly of the reactor prototype, with rectangular, octagonal and irregular polygonal partitions. The rod structure size and spacing can well meet the principle of similarity, and the space layout is compact. The electric heating rods model the power size of the reactor under low power and shutdown conditions, and can simulate the decay heat power curve through the power supply to meet the overall test requirements. One heating rod is used to simulate a box of fuel assemblies, and the spacing of the electric heating rods is determined on the basis that the flow channel area meets the similarity criterion. The radial power partition design and axial distribution power curve and segmented discrete resistor processing and production.

[0124] Embodiment 2:

[0125] This embodiment provides a system for arranging power zones of electric heating rods of a core test bench, including:

[0126] An acquisition module is used to obtain design parameters of the electric heating rods of the test bench, wherein the design parameters include the total number, diameter, and center distance between adjacent rods, and the total number is the same as the total number of fuel assemblies of the prototype core.

[0127] The determination module is connected to the acquisition module, and is used to determine the corresponding shapes and numbers of rods of the three partitions under the radial power distribution according to the total number of electric heating rods, and is also used to determine the corresponding radial power peak factors of the three partitions according to the design parameters and the corresponding numbers of rods and critical heat flux density CHF number similarity criteria of the three partitions, and determine the corresponding partition powers of the three partitions according to the radial power peak factors, and is used to determine the corresponding axial power peak factors of the three partitions to determine the axial power distribution.

[0128] In some embodiments, the acquisition module is used to calculate the diameter range of the electric heating rods based on the total number of electric heating rods, the height-to-diameter ratio range, and the fuel rod cross-sectional area ratio; and is also used to calculate the ratio range of the center distance between adjacent electric heating rods to the diameter of the electric heating rods based on the effective flow area between adjacent electric heating rods and the prototype core design ratio; and is used to determine the center distance between adjacent rods based on the ratio range and the electric heating rod diameter range.

[0129] In some embodiments, the three partitions include a first zone, a second zone, and a third zone. The determination module is used to determine, based on the total number of electric heating rods, that the first zone under radial power distribution is located at the center and is a square, the second zone is an octagon, and the third zone is an irregular polygon, and the three partitions have a common center point, the number of electric heating rods from the first zone to the third zone is arranged in ascending order, and the second zone and the third zone have an array of electric heating rods with the same number of layers.

[0130] In some embodiments, the determination module is used to bring the design parameters and the corresponding rod numbers of the three partitions into the CHF number similarity criterion and the heat rod design criterion, calculate the corresponding heat pipe peak factors of the three partitions, and also to determine the heat pipe peak factor as the radial power peak factor.

[0131] In some embodiments, the CHF number similarity criterion satisfies:

[0132]

[0133] Among them, CHF,R is the CHF number similarity criterion, q″ CRIT is the critical heat flux relationship for low velocity two-phase natural circulation proposed by Katto, q″ c,ROD is the heat flux of the electric heating rod, m is the test bench, p is the prototype reactor, and R is the ratio of the test bench to the prototype core.

[0134] in,

[0135]

[0136] G c is the mass flow rate through the core, σ is the surface tension, d h,c is the hydraulic diameter of the sub-channel, and for the electric heating rods arranged in a square:

[0137]

[0138] Where s is the center distance between adjacent rods, d is the diameter, is the total core power.

[0139] Substituting formula (4), (5), and (6) into formula (3), we get:

[0140]

[0141] In the subscript of the formula, m is the test bench, p is the prototype reactor, R represents the ratio of the test bench to the prototype reactor core, c is the reactor core, N is the number of electric heating rods or sub-channels, and F q is the heat pipe peak factor, l c is the reactor core length, h sub is the subcooled enthalpy value, h lg is the latent heat of vaporization, ρ ls is the saturated liquid density.

[0142] In some embodiments, the determination module is configured to determine the average power per single electric heating rod according to the total power and the total number of the prototype reactor core, and calculate the maximum power per single rod corresponding to three zones according to the radial power peak factor and the average power per single rod. The determination module is further configured to determine the zone power corresponding to the three zones according to the maximum power per single rod and the number of rods corresponding to the three zones.

[0143] In some embodiments, the determination module is configured to obtain a polynomial relationship of the axial normalized power distribution by fitting the axial power distribution curve of the fuel assembly of the prototype reactor core:

[0144] P a = f×(Ah 5 + Bh 4 + Ch 3 + Dh 2 + Eh + F),

[0145] where P a is the axial normalized power of the electric heating rod, f is an adjustment factor, h is the dimensionless axial height of the prototype reactor core, 0 < h < 1, 61 < A < 64, -177 < B < -171, 164 < C < 170, -72 < D < -66, 11 < E < 17, 2.0 < F < 2.5, 0.97 < f < 0.99, and the determination module is further configured to determine the axial power peak factors corresponding to the three zones according to the polynomial relationship. In a specific embodiment, A = 63.37, B = -174.66, C = 166.99, D = -69.26, and E = 14.33.

[0146] In some embodiments, the electric heating rods are configured to simulate the axial non-uniform power distribution of the fuel assembly of the prototype reactor core based on the way of discrete series connection by resistance segments.

[0147] In some embodiments, the total number is 177, and the number of electric heating rods in the first zone to the third zone is 9, 60, and 108, respectively. The ranges of the radial power peak factors of the three partitions are 1.50-1.56, 1.21-1.27, and 0.79-0.85, respectively. The ranges of the axial power peak factors of the three partitions are all 1.5-1.7. The maximum single-rod maximum powers of the three partitions are 44, 35, and 23, respectively. The ranges of the partition powers of the three partitions are 233.39-388.98, 1261.02-2101.7, and 1500-2500, respectively.

[0148] Embodiment 3:

[0149] This embodiment provides an electronic device, comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for arranging power partitions of electric heating rods of a core test bench as described in Example 1 by executing the computer instructions.

[0150] Embodiment 4:

[0151] This embodiment provides a core test bench, including a plurality of electric heating rods.

[0152] A plurality of electric heating rods are used for power partitioning arrangement according to the power partitioning arrangement method of the core test bench electric heating rods described in Example 1. Each electric heating rod includes M resistors, and the M resistors are connected in series to lead out power supply wires, 20≤M≤40.

[0153] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for arranging power zones of electric heating rods of a core test bench, characterized in that: include: Obtaining design parameters of the electric heating rods of the test bench, wherein the design parameters include the total number, diameter, and center distance between adjacent rods; Determine the corresponding shapes and numbers of the three subareas under radial power distribution according to the total number of electric heating rods; Determine the radial power peak factors corresponding to the three partitions according to the design parameters and the similarity criterion of the number of rods and the critical heat flux CHF number corresponding to the three partitions; Determine the corresponding partition powers of the three partitions according to the radial power peak factor; Determine the corresponding axial power crest factors of the three partitions to determine the axial power distribution.

2. The method according to claim 1, characterized in that The obtaining of the design parameters of the electric heating rod of the test bench specifically includes: The diameter range of the electric heating rods is calculated based on the total number of electric heating rods, the height-to-diameter ratio range, and the cross-sectional area reduction ratio of the fuel rods; According to the effective flow area between adjacent electric heating rods and the design scale ratio of the prototype core, the ratio range of the center distance between adjacent rods to the diameter of the electric heating rod is calculated; The center distance between adjacent rods is determined according to the ratio range and the diameter range of the electric heating rods.

3. The method according to claim 1, characterized in that The three zones include the first zone, the second zone, and the third zone. According to the total number of electric heating rods, the corresponding shapes and rod numbers of the three subareas under the radial power distribution are determined, specifically including: According to the total number of electric heating rods, it is determined that the first zone under the radial power distribution is located at the center and is a square, the second zone is an octagon, and the third zone is an irregular polygon, and the three partitions have a common center point. The number of electric heating rods in the first zone to the third zone is arranged in ascending order, and the second zone and the third zone have an array of electric heating rods with the same number of layers.

4. The method according to claim 1, characterized in that: According to the design parameters and the similarity criterion of the number of rods and the critical heat flux CHF number of the three partitions, the radial power peak factors corresponding to the three partitions are determined, specifically including: Substituting the design parameters and the corresponding number of rods in the three partitions into the CHF number similarity criterion and the heat rod design criterion, the corresponding heat pipe peak factors of the three partitions are calculated; The heat pipe crest factor is determined as the radial power crest factor.

5. The method according to claim 4, characterized in that The CHF number similarity criterion satisfies: Among them, CHF,R is the CHF number similarity criterion, q″ CRIT is the critical heat flow relationship of two-phase natural circulation at low flow rate, q″ c,ROD is the heat flux of the electric heating rod, m is the test bench, p is the prototype reactor, and R is the ratio of the test bench to the prototype core.

6. The method according to claim 1, characterized in that The determining the partition powers corresponding to the three partitions according to the radial power peak factor specifically includes: Determine the average power of a single electric heating rod according to the total power of the prototype core and the total number; Calculate the corresponding single-rod maximum powers of the three partitions according to the radial power peak factor and the single-rod average power; According to the corresponding single-rod maximum power and number of rods in the three partitions, the corresponding partition powers of the three partitions are determined.

7. The method according to claim 6, characterized in that The determining of the corresponding axial power peak factors of the three partitions specifically includes: The polynomial relationship of axial normalized power distribution is obtained by fitting the axial power distribution curve of the prototype core fuel assembly: P a =f×(Ah 5 +Bh 4 +Ch 3 +Dh 2 +Eh+F), Among them, P a is the normalized axial power of the electric heating rod, f is the adjustment factor, h is the dimensionless axial height of the prototype core, <h<1,61<A<64,-177<B<-171,164<C<170,-72<D<-66,11<E<17,2.0<F<2.5,0.97<f<0.99; The corresponding axial power peak factors of the three partitions are determined according to the polynomial relationship.

8. The method according to claim 7, characterized in that Also includes: The axial non-uniform power distribution of the prototype core fuel assembly is simulated based on the piecewise discrete series resistor method.

9. The method according to claim 6, characterized in that The total number is 177, and the number of electric heating rods in the first zone to the third zone are 9, 60, and 108 respectively. The corresponding radial power peak factors of the three partitions range from 1.50 to 1.56, 1.21 to 1.27, and 0.79 to 0.85, respectively. The corresponding axial power peak factors of the three partitions are all in the range of 1.5-1.

7. The maximum single-rod power values ​​of the three partitions are 44, 35, and 23, respectively. The corresponding partition powers of the three partitions range from 233.39-388.98, 1261.02-2101.7, and 1500-2500 respectively.

10. A power partitioning arrangement system for electric heating rods of a core test bench, characterized in that: include: An acquisition module is used to acquire design parameters of the electric heating rods of the test bench, wherein the design parameters include the total number, diameter, and center distance between adjacent rods, and the total number is the same as the total number of fuel assemblies of the prototype core. A determination module, connected to the acquisition module, is used to determine the corresponding shapes and numbers of the three partitions under the radial power distribution according to the total number of electric heating rods, It is also used to determine the radial power peak factors corresponding to the three partitions according to the design parameters and the number of rods corresponding to the three partitions and the critical heat flux density CHF similarity criterion, and determine the partition powers corresponding to the three partitions according to the radial power peak factors, And, used to determine the corresponding axial power peak factors of the three partitions to determine the axial power distribution.

11. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for arranging power partitions of electric heating rods of a core test bench according to any one of claims 1 to 9 by executing the computer instructions.

12. A core test bench, characterized in that: It comprises a plurality of electric heating rods, and the plurality of electric heating rods are used for power partitioning arrangement according to the method for arranging power partitions of electric heating rods of a core test bench according to any one of claims 1-9.

13. The core test bench according to claim 12, characterized in that: Each electric heating rod includes M resistors, and the M resistors are connected in series to lead out power supply wires, 20≤M≤40.

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