Method and device for calculating toxicity of reactor core of nuclear power plant, storage medium and electronic equipment

Abstract

The invention relates to a nuclear power plant reactor core toxicity calculation method and device, a storage medium and electronic equipment. The method comprises the following steps: determining boundary conditions for calculating the reactor core toxicity; determining parameters of the single group point pile model based on the boundary conditions; and calculating the reactor core toxicity of the reactor at any moment according to the parameters of the single-group-point reactor model and the dynamic equation. According to the method, the toxicity of the reactor core is calculated based on the single-group-point reactor model, so that the calculation time can be shortened, the calculation time can be shortened, an effective reference can be provided for reactivity balance calculation and reactivity of an operator, the reactivity control risk is reduced, and the three-waste emission of a unit is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plants, and more specifically, to a method, device, storage medium and electronic equipment for calculating the toxicity of a reactor core in a nuclear power plant. Background Art

[0002] The change in reactivity caused by fission products in the reactor is called the toxicity of the fission products. 135 Xe and 149 There are two fission products, Sm, and Sm, which have large absorption cross sections and have a huge impact on the reactivity of the reactor. Especially when the reactor power changes rapidly, the toxicity of the core changes dramatically, which brings difficulties to the operation of the reactor. With the continuous expansion of my country's nuclear power installed capacity, nuclear power plants are increasingly involved in peak load regulation and load tracking. Real-time tracking of core toxicity helps operators predict changes in core reactivity.

[0003] At present, the core calculation of pressurized water reactors based on multi-group equations is very mature. However, due to the complexity of the model, the large amount of calculation, and the long time required to obtain the calculation results, it is difficult to use it for real-time tracking of core toxicity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method, device, storage medium and electronic equipment for calculating the toxicity of a reactor core in a nuclear power plant in view of the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for calculating the toxicity of a nuclear power plant reactor core, comprising the following steps:

[0006] Determine the boundary conditions for calculating reactor core toxicity;

[0007] Determining parameters of a single cluster point pile model based on the boundary conditions;

[0008] The core toxicity of the reactor at any time is calculated according to the parameters of the single-group point reactor model and the dynamic equation.

[0009] In the method for calculating the toxicity of the nuclear power plant reactor core of the present invention, the core toxicity includes: xenon toxicity;

[0010] The boundary conditions include: xenon poison boundary conditions;

[0011] The xenon toxicity boundary conditions include: balanced xenon toxicity at full power, maximum xenon toxicity of a stack jump at full power, and xenon toxicity at time T after the new stack is increased to full power.

[0012] In the method for calculating the toxicity of a nuclear power plant reactor core according to the present invention, the boundary conditions for determining and calculating the toxicity of the reactor core include:

[0013] Based on the conditions of full-power balanced xenon poisoning and the dynamic equation of xenon poisoning, the calculation formula of balanced xenon poisoning at full power is determined;

[0014] The calculation formula to determine the change of xenon toxicity when the reactor is tripped at full power;

[0015] Determining the intermediate parameters in the calculation formula for the change of the xenon poisoning of the stack at full power;

[0016] Calculating the equilibrium xenon toxicity at full power according to the determined intermediate parameters;

[0017] Calculating according to the determined intermediate parameter and the calculation formula of the change of the xenon toxicity of the stack under full power, to obtain the maximum xenon toxicity of the stack under full power;

[0018] The xenon toxicity at time T after the new stack reaches full power is calculated based on the determined intermediate parameters.

[0019] In the method for calculating the toxicity of a nuclear power plant reactor core according to the present invention, the parameters of the single cluster point pile model include: a first group of parameters;

[0020] The first set of parameters includes: 135 The fission yield of I, 135 The fission yield of Xe and the first change at full power;

[0021] The determining of the parameters of the single cluster point pile model based on the boundary conditions includes:

[0022] Based on the equilibrium xenon toxicity at full power, the maximum xenon toxicity of the stack jump at full power, and the xenon toxicity at time T after the new stack is increased to full power, and by calculating through a transcendental equation, the time corresponding to the maximum xenon toxicity of the stack jump at full power is obtained;

[0023] The maximum xenon toxicity of the reactor under full power condition is calculated to obtain the 135 The fission yield of I, 135 The fission yield of Xe and the first change at the full power.

[0024] In the method for calculating the toxicity of the nuclear power plant reactor core of the present invention, the core toxicity further includes: samarium poisoning;

[0025] The boundary conditions include: samarium poison boundary conditions;

[0026] The samarium poisoning boundary conditions include: balanced samarium poisoning at full power and maximum samarium poisoning of the stack tripping at full power.

[0027] In the method for calculating the toxicity of a nuclear power plant reactor core according to the present invention, the boundary conditions for determining and calculating the toxicity of the reactor core include:

[0028] Based on the conditions of full-power balanced samarium poisoning and the dynamic equation of samarium poisoning, the calculation formula of balanced samarium poisoning at full power is determined;

[0029] Calculate according to the calculation formula of the balanced samarium toxicity at full power to obtain the balanced samarium toxicity at full power;

[0030] The maximum samarium poisoning of the full power down-trip stack is determined.

[0031] In the method for calculating the toxicity of a nuclear power plant reactor core according to the present invention, the parameters of the single cluster point pile model include: a second group of parameters;

[0032] The second set of parameters includes: 149 The fission yield of Pm and the second variation at full power;

[0033] The determining of the parameters of the single cluster point pile model based on the boundary conditions includes:

[0034] The equilibrium samarium poisoning at full power and the maximum samarium poisoning of the stack at full power are calculated to obtain the 149 The fission yield of Pm and the second change at the full power.

[0035] The present invention also provides a nuclear power plant reactor core toxicity calculation device, comprising:

[0036] A boundary condition determination unit, used for determining boundary conditions for calculating reactor core toxicity;

[0037] A parameter calculation unit, used to determine the parameters of the single group point pile model based on the boundary conditions;

[0038] The core toxicity calculation unit is used to calculate the core toxicity of the reactor at any time according to the parameters of the single group point reactor model and the dynamic equation.

[0039] The present invention also provides a storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor to execute the steps of the method for calculating the toxicity of a nuclear power plant reactor core as described above.

[0040] The present invention also provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the method for calculating the toxicity of a nuclear power plant reactor core as described above by calling the computer program stored in the memory.

[0041] The method, device, storage medium and electronic device for calculating the toxicity of the reactor core of a nuclear power plant according to the present invention have the following beneficial effects: including the following steps: determining the boundary conditions for calculating the toxicity of the reactor core; determining the parameters of the single group point pile model based on the boundary conditions; calculating the core toxicity of the reactor at any time according to the parameters of the single group point pile model and the dynamic equation. The present invention calculates the toxicity of the reactor core based on the single group point pile model, which can not only reduce the calculation time, but also provide an effective reference for the operator to perform reactivity balance calculation and reactivity, reduce the risk of reactivity control, and reduce the emission of three wastes from the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0043] Figure 1 It is a schematic flow chart of a method for calculating toxicity of a nuclear power plant reactor core provided by the present invention;

[0044] Figure 2 It is a principle block diagram of the nuclear power plant reactor core toxicity calculation device provided by the present invention;

[0045] Figure 3 It is a schematic diagram of the measured values ​​of core toxicity provided by the present invention and the calculated values ​​of the single group point reactor model. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] refer to Figure 1 , Figure 1 A schematic flow chart of a method for calculating toxicity of a nuclear power plant reactor core provided by the present invention.

[0048] Specifically, Figure 1 As shown, the method for calculating the toxicity of the reactor core of a nuclear power plant includes the following steps:

[0049] Step S101: Determine the boundary conditions for calculating reactor core toxicity.

[0050] Optionally, in the embodiment of the present invention, the core toxicity includes: xenon toxicity; accordingly, the boundary condition includes: xenon toxicity boundary condition; the xenon toxicity boundary condition includes: equilibrium xenon toxicity at full power (P Xe (∞)), the maximum xenon toxicity of the full-power down-trip reactor (P Xe (t m)) and the xenon toxicity (P Xe (T)).

[0051] Among them, determining and calculating the boundary conditions for reactor core toxicity includes: determining a calculation formula for balanced xenon toxicity at full power based on conditions under full-power balanced xenon toxicity conditions and a dynamic equation of xenon toxicity; determining a calculation formula for changes in xenon toxicity due to stack jump at full power; determining intermediate parameters in the calculation formula for changes in xenon toxicity due to stack jump at full power; calculating balanced xenon toxicity at full power according to the determined intermediate parameters; calculating according to the determined intermediate parameters and the calculation formula for changes in xenon toxicity due to stack jump at full power to obtain the maximum xenon toxicity due to stack jump at full power; and calculating the xenon toxicity at time T after the new stack is increased to full power according to the determined intermediate parameters.

[0052] Further, in the embodiment of the present invention, the core toxicity also includes: samarium poisoning; the boundary conditions include: samarium poisoning boundary conditions; the samarium poisoning boundary conditions include: balanced samarium poisoning at full power (P Sm (∞)) and the maximum samarium poisoning of the full-power down-trip reactor (P Sm (t m )).

[0053] Correspondingly, determining the boundary conditions for calculating the toxicity of the reactor core includes: determining the calculation formula for the equilibrium samarium poisoning at full power based on the conditions under the full-power equilibrium samarium poisoning condition and the dynamic equation of samarium poisoning; calculating according to the calculation formula for the equilibrium samarium poisoning at full power to obtain the equilibrium samarium poisoning at full power; and determining the maximum samarium poisoning of the reactor when it jumps at full power.

[0054] Step S102: Determine the parameters of the single cluster point pile model based on the boundary conditions.

[0055] Optionally, in an embodiment of the present invention, the parameters of the single cluster point pile model include: a first group of parameters; wherein the first group of parameters includes: 135 The fission yield of I (γ I ), 135 The fission yield of Xe (γ Xe ) and the first change at full power.

[0056] In the embodiment of the present invention, the parameters of the single cluster point reactor model are determined based on the boundary conditions, including: based on the equilibrium xenon toxicity at full power, the maximum xenon toxicity of the stack jump at full power, and the xenon toxicity at time T after the new stack is increased to full power, and calculated by transcendental equations to obtain the time corresponding to the maximum xenon toxicity of the stack jump at full power; according to the time corresponding to the maximum xenon toxicity of the stack jump at full power, the time corresponding to the maximum xenon toxicity of the stack jump is calculated to obtain 135 The fission yield of I, 135 Xe fission yield and first variation at full power.

[0057] Further, in the embodiment of the present invention, the parameters of the single cluster point pile model also include: a second group of parameters; wherein the second group of parameters includes: 149 The fission yield of Pm (γ Pm ) and the second variation at full power. Correspondingly, determining the parameters of the single cluster point pile model based on the boundary conditions includes: calculating according to the equilibrium samarium poisoning at full power and the maximum samarium poisoning of the jump pile at full power, obtaining 149 The fission yield of Pm and the second change at full power.

[0058] Step S103: Calculate the core toxicity of the reactor at any time based on the parameters of the single cluster point reactor model and the dynamic equation.

[0059] The single group point pile model has the advantages of simplicity and fast calculation speed. Based on this characteristic, the present invention uses a set of boundary conditions to determine the parameters of the single group point pile model, and then uses the determined parameters of the single group point pile model to perform actual nuclear power plant core toxicity calculations.

[0060] Specifically, xenon toxicity is determined as follows:

[0061] Under the single group point approximation, 135 Xe concentrationN Xe and 135 I concentration N I Obey the following formula:

[0062]

[0063]

[0064] and 135 The reactivity changes caused by Xe (i.e. xenon poisoning) are:

[0065]

[0066] Among them, γ I and γ Xe They are 135 I and 135 The fission yield of Xe, ∑ f is the macroscopic fission cross section of the fuel, Φ(t) is the average thermal neutron flux density in the pile, λ I and λ Xe They are 135 I and 135 The decay constant of Xe. is the macroscopic absorption cross section of the fuel. σ: the reaction surface, which indicates the probability or probability of a nuclear reaction between a microscopic particle and a target nucleus; σ a，Xe for 135The microscopic absorption cross section of Xe is the probability or probability of a nuclear reaction between a neutron and a Xe nucleus; Φ: the neutron flux level, which indicates the number of neutrons passing through a unit area per unit time, and its unit is: neutron / square centimeter·second; Φ(t) represents the neutron energy level at any time t.

[0067] Introducing auxiliary variables The dynamic equation of xenon poisoning is obtained as follows:

[0068]

[0069]

[0070] From the dynamic equation of xenon poisoning, we know that if we can determine the parameter λ I , Xe , σ a，Xe Φ(t),γ I , γ Xe , The change in xenon toxicity can be determined. a，Xe Φ(t) represents the probability of a nuclear reaction between a neutron and a Xe nucleus passing through a unit area per unit time. a，Xe Φ0 represents the first change at full power, and Φ0 is the neutron energy level at full power.

[0071] Among them, λ I , Xe is the decay constant of the nuclide, and its values ​​are: Xe =2.1×10 -5 / s,λ I =2.87×10 -5 / s. Ratio of fuel fission cross section to absorption cross section is almost unchanged. 135 I and 135 Xe fission yield γ I , γ Xe , σ a，Xe As the neutron energy changes, assuming that for a certain core, γ I , γ Xe , σ a，Xe Does not change with power level. Reactor power is proportional to neutron flux. If σ at full power is determined a，Xe Φ0, we can determine σ at any power a，Xe Φ(t). Therefore, based on the above, we only need to determine γ I , γ Xe , σ a,XeWith the three parameters of Φ0, the dynamic equation of xenon poisoning can be completely determined, and then the core toxicity of the reactor at any time can be determined by the determined dynamic equation of xenon poisoning.

[0072] In the embodiment of the present invention, the balanced xenon poison P at full power is selected. Xe (∞), the maximum xenon toxicity P of the reactor under full power conditions Xe (t m ) and the xenon poison P at time T after the new stack reaches full power Xe (T) is used as a boundary condition to determine γ I , γ Xe , σ a,Xe Φ0, these three parameters. The specific determination process is as follows:

[0073] Full power balanced xenon poisoning condition Substituting into equation (4) and (5), we get:

[0074]

[0075] When the reactor is tripped at full power, the change of xenon toxicity is:

[0076] P Xe (t) = aexp(-λ Xe t)-bexp(-λ I t) (7).

[0077] in,

[0078]

[0079]

[0080] Assume that at time t m The maximum xenon toxicity P after the jump occurs Xe (t m ),at this time It follows that:

[0081]

[0082]

[0083] From equations (6), (8) and (9), we can get:

[0084]

[0085] From equations (8) and (9), we can get:

[0086]

[0087]

[0088] When the new stack rapidly rises to full power, the xenon toxicity at time T is,

[0089]

[0090] Therefore, when P Xe (∞), P Xe (t m ) and P Xe (T), the time t corresponding to the maximum xenon poisoning of the reactor under full power conditions can be obtained by transcending equation (12): m , and then calculate a and b through equations (10) and (11). Finally, equations (13), (14) and (15) can be combined to determine γ I , γ Xe , σ a，Xe Φ0 these three parameters.

[0091] Determination of Samarium Poisoning:

[0092] Under the single group point heap approximation, 149 Sm and 149 The nuclear density of Pm is N Sm (t) and N Pm (t) follows the following equation:

[0093]

[0094]

[0095] Samarium poison is:

[0096]

[0097] where γ Pm for 149 The fission yield of Pm, λ Pm for 149 Decay constant of Pm, σ a，Sm for 149 Microscopic absorption cross section of Sm. Introducing auxiliary variables The dynamic equation of samarium poisoning is as follows:

[0098]

[0099]

[0100] 149 The decay constant λ of Pm Pm =3.56×10 -6 / s, and its output γ Pm Related to the neutron energy spectrum, σ a，SmΦ(t) represents 149 The probability of Sm reacting with neutrons in the reactor under neutron flux Φ(t). Similar to the treatment of xenon poisoning, assuming that for a certain reactor γ Pm , σ a，Sm does not change with power, then σ a，Sm Φ is proportional to the power. The relative nuclear power Pn is measured by the on-site instrument. As long as we know σ at full power a，Sm Φ0, σ at any nuclear power a，Sm Φ=σ a，Sm Φ0Pn. Therefore, in order to determine the change of samarium poisoning, it is necessary to obtain σ through boundary conditions a，Sm Φ0、γ Pm Two parameters.

[0101] Select full power and balanced SmdP Sm (∞) and the maximum samarium poison P after the reactor trip under full power conditions Sm (t m ) as the boundary condition. By solving (19) and (20), we can obtain:

[0102]

[0103]

[0104] From the above two formulas, we can get:

[0105]

[0106]

[0107] Next, taking the core of the first cycle of a nuclear power plant as an example, the xenon and samarium poisoning of the core are simulated and calculated under the single cluster point reactor approximation. The M310 core used in the power plant is widely used in second-generation nuclear power plants and is representative. Xe (∞),P Xe (t m ), P Xe (T), P Sm (∞),P Sm (t m ) Five boundary conditions determine γ I , γ Xe , γ Pm , σ a，Xe Φ0、σ a，Sm Φ0 five parameters.

[0108] The boundary conditions used in the present invention are calculated by using the SCEINECE program package of Framatome and verified by a startup physical test. The program has been widely used in the core design of commercial nuclear power plants. Table 1 shows the five boundary conditions and the five parameters determined by them.

[0109] Table 1 Boundary conditions and undetermined parameters of point pile model

[0110]

[0111] Table 1 gives the γ I , γ Xe , γ Pm , σ a，Xe φ0、σ a，Sm As long as the nuclear power is given, the xenon poisoning and samarium poisoning at any time can be calculated through the single-group point reactor model.

[0112] In order to solve the xenon and samarium poisoning under real working conditions, the differential equations (4)(5) and (19)(20) are transformed into difference equations.

[0113]

[0114]

[0115]

[0116] P Sm (t+Δt)=λ Pm X Pm (t)Δt+P Sm (t)(1-σ a，Sm Φ(t)Δt) (28).

[0117] The final effect is as follows Figure 3 As shown, most of the time, the reactivity changes caused by xenon poisoning and samarium poisoning given by the single-group point reactor model (shown by the blue line) are basically consistent with the core toxicity changes calculated by the reactivity balance equation (shown by the green line).

[0118] The present invention can realize simulation calculation of core toxicity and reactivity under unit power operation conditions, provide effective reference for operators to perform reactivity balance calculation and reactivity control, reduce reactivity control risks, and reduce unit three waste emissions.

[0119] refer to Figure 2 , Figure 2 This is a principle block diagram of the nuclear power plant reactor core toxicity calculation device provided by the present invention.

[0120] Specifically, Figure 2 As shown, the nuclear power plant reactor core toxicity calculation device comprises:

[0121] The boundary condition determination unit 201 is used to determine the boundary conditions for calculating the reactor core toxicity.

[0122] The parameter calculation unit 202 is used to determine the parameters of the single cluster point pile model based on the boundary conditions.

[0123] The core toxicity calculation unit 203 is used to calculate the core toxicity of the reactor at any time according to the parameters of the single group point reactor model and the dynamic equation.

[0124] Specifically, the specific coordinated operation process between the various units in the nuclear power plant reactor core toxicity calculation device here can refer to the above-mentioned nuclear power plant reactor core toxicity calculation method, which will not be repeated here.

[0125] In addition, an electronic device of the present invention includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement a method for calculating the toxicity of a nuclear power plant reactor core as described in any one of the above. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and when executed, it executes the above functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, a desktop, a tablet computer, a smart phone, or a server.

[0126] In addition, a storage medium of the present invention stores a computer program thereon, and when the computer program is executed by a processor, any one of the above methods for calculating the toxicity of a nuclear power plant reactor core is implemented. Specifically, it should be noted that the above storage medium of the present invention may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system, device or device or used in combination with it. In the present invention, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate, or transmit programs for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0127] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0128] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0129] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0130] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0131] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A method for calculating the toxicity of a nuclear power plant reactor core, characterized in that: The following steps are involved: Determine the boundary conditions for calculating reactor core toxicity; Determining parameters of a single cluster point pile model based on the boundary conditions; The core toxicity of the reactor at any time is calculated according to the parameters of the single-group point reactor model and the dynamic equation.

2. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 1, characterized in that: The core toxicity includes: xenon toxicity; The boundary conditions include: xenon poison boundary conditions; The xenon toxicity boundary conditions include: balanced xenon toxicity at full power, maximum xenon toxicity of a stack jump at full power, and xenon toxicity at time T after the new stack is increased to full power.

3. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 2, characterized in that: The boundary conditions for determining and calculating the reactor core toxicity include: Based on the conditions of full-power balanced xenon poisoning and the dynamic equation of xenon poisoning, the calculation formula of balanced xenon poisoning at full power is determined; The calculation formula to determine the change of xenon toxicity when the reactor is tripped at full power; Determining the intermediate parameters in the calculation formula for the change of the xenon poisoning of the stack at full power; Calculating the equilibrium xenon toxicity at full power according to the determined intermediate parameters; Calculating according to the determined intermediate parameter and the calculation formula of the change of the xenon toxicity of the stack under full power, to obtain the maximum xenon toxicity of the stack under full power; The xenon toxicity at time T after the new stack reaches full power is calculated based on the determined intermediate parameters.

4. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 3, characterized in that: The parameters of the single cluster point pile model include: a first set of parameters; The first set of parameters includes: 135 The fission yield of I, 135 The fission yield of Xe and the first change at full power; The determining of the parameters of the single cluster point pile model based on the boundary conditions includes: Based on the equilibrium xenon toxicity at full power, the maximum xenon toxicity of the stack jump at full power, and the xenon toxicity at time T after the new stack is increased to full power, and by calculating through a transcendental equation, the time corresponding to the maximum xenon toxicity of the stack jump at full power is obtained; The maximum xenon poisoning time corresponding to the jump of the reactor under the full power condition is calculated to obtain the 135 The fission yield of I, 135 The fission yield of Xe and the first change at the full power.

5. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 1, characterized in that: The core toxicity also includes: samarium poisoning; The boundary conditions include: samarium poison boundary conditions; The samarium poisoning boundary conditions include: balanced samarium poisoning at full power and maximum samarium poisoning of the stack tripping at full power.

6. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 5, characterized in that: The boundary conditions for determining and calculating the reactor core toxicity include: Based on the conditions of full-power balanced samarium poisoning and the dynamic equation of samarium poisoning, the calculation formula of balanced samarium poisoning at full power is determined; Calculate according to the calculation formula of the balanced samarium toxicity at full power to obtain the balanced samarium toxicity at full power; The maximum samarium poisoning of the full power down-trip stack is determined.

7. The method for calculating the toxicity of a nuclear power plant reactor core according to claim 6, characterized in that: The parameters of the single cluster point pile model include: a second set of parameters; The second set of parameters includes: 149 The fission yield of Pm and the second variation at full power; The determining of the parameters of the single cluster point pile model based on the boundary conditions includes: The equilibrium samarium poisoning at full power and the maximum samarium poisoning of the stack tripping at full power are calculated to obtain the 149 The fission yield of Pm and the second change at the full power.

8. A nuclear power plant reactor core toxicity calculation device, characterized in that: include: A boundary condition determination unit, used for determining boundary conditions for calculating reactor core toxicity; A parameter calculation unit, used to determine the parameters of the single group point pile model based on the boundary conditions; The core toxicity calculation unit is used to calculate the core toxicity of the reactor at any time according to the parameters of the single group point reactor model and the dynamic equation.

9. A storage medium, characterized in that: The storage medium stores a computer program, and the computer program is suitable for being loaded by a processor to execute the steps of the method for calculating the toxicity of a nuclear power plant reactor core as described in any one of claims 1 to 7.

10. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the method for calculating the toxicity of the reactor core of a nuclear power plant as claimed in any one of claims 1 to 7 by calling the computer program stored in the memory.

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