Design method and system for arrangement scheme of hydrogen recombiner in containment vessel of nuclear power plant

Abstract

The invention discloses a design method of a hydrogen recombiner arrangement scheme in a nuclear power plant containment. The design method comprises the following steps: step 1, determining the total number of hydrogen recombiners; step 2, determining the number of the hydrogen recombiner in the compartment: step 2-1, selecting a serious accident sequence; 2-2, carrying out risk analysis on the selected serious accident sequence, and determining a hydrogen risk compartment; step 2-3, carrying out sensitivity analysis on the number of the hydrogen recombiner in the risk compartment, and determining the number of the hydrogen recombiner in the compartment; and step 3, determining a hydrogen recombiner arrangement scheme according to the total number of the hydrogen recombiners and the number of the recombiners in each compartment. The method can be used for guiding the scheme arrangement of the hydrogen recombiner, solves the problem of lack of a standard design process of the arrangement scheme of the hydrogen recombiner in the prior art, and improves the effectiveness of the arrangement scheme of the hydrogen recombiner, thereby avoiding the processes of slow combustion, fast combustion, fire blast, explosion and the like after a serious accident occurs in a nuclear power plant, and guaranteeing the integrity of a containment.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to a design method and system for a hydrogen recombiner arrangement scheme in a containment of a nuclear power plant. Background Art

[0002] After a serious accident in a nuclear power plant, the coolant and metals such as the zirconium cladding will undergo a violent oxidation reaction, releasing hydrogen. As the hydrogen concentration increases, slow combustion, fast combustion, explosion, and other processes may occur. Large-scale combustion of hydrogen or explosion-explosion transitions will seriously threaten the integrity of the containment. Therefore, the elimination of hydrogen risks must be considered during the design of nuclear power plants.

[0003] At present, the main hydrogen risk elimination solutions include hydrogen recombiner solution and hydrogen igniter solution. In addition, there is no standard solution design process for hydrogen recombiner solution. Its layout solution mainly relies on the two processes of "solution assumption" and "validity verification" to obtain iterative calculation and analysis, which has problems such as large amount of calculation and inexhaustible accident sequence. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a risk-guided design method and device for a hydrogen recombiner layout scheme in a nuclear power plant containment, which can be used to guide the layout of the hydrogen recombiner scheme, solve the problem of the lack of a standard hydrogen recombiner layout scheme design process in the prior art, improve the design efficiency of the hydrogen recombiner layout scheme, and increase the effectiveness of the scheme, thereby avoiding slow combustion, fast combustion, combustion and explosion processes after a serious accident in a nuclear power plant, and ensuring the integrity of the containment.

[0005] In a first aspect, the present invention provides a design method for a hydrogen recombiner arrangement scheme in a nuclear power plant containment, comprising:

[0006] Step 1, determining the total number of hydrogen recombiners;

[0007] Step 2, determining the number of hydrogen recombiners in the compartment, includes:

[0008] Step 2-1, selecting a severe accident sequence;

[0009] Step 2-2, conduct risk analysis on the selected severe accident sequence and determine the hydrogen risk compartment;

[0010] Step 2-3, conduct a sensitivity analysis of the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment;

[0011] Step 3: Determine the layout plan of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

[0012] Optionally, the method further comprises:

[0013] Step 4: Analyze the effectiveness of the hydrogen recombiner layout plan.

[0014] Optionally, determining the total number of hydrogen recombiners comprises the following steps:

[0015] Conduct severe accident phenomenon analysis of nuclear power plants and identify uncertainty parameters affecting hydrogen concentration;

[0016] Sampling of uncertainty parameters;

[0017] Carry out uncertainty calculation of hydrogen concentration to obtain the volume concentration of hydrogen in the containment;

[0018] A hydrogen generation-recombination model is built based on the hydrogen concentration, and the total number of hydrogen recombiners is calculated using the hydrogen generation-recombination model.

[0019] Optionally, the uncertainty parameters include containment pressure, hydrogen release time, core zirconium loading, containment volume, and containment temperature.

[0020] Optionally, the number of samples for sampling the uncertainty parameter is calculated according to the following formula:

[0021] β=1-γ N

[0022] In the formula, β is the confidence level, N is the number of samples, and γ is the probability.

[0023] Optionally, the uncertainty calculation of hydrogen concentration to obtain the hydrogen volume concentration in the containment vessel comprises the following steps:

[0024] Calculate the volume V of hydrogen under standard conditions;

[0025] The hydrogen volume concentration in the containment is calculated based on the sampling sensitivity parameters and the hydrogen volume V under standard conditions.

[0026] Optionally, building a hydrogen generation-compound model based on hydrogen concentration and calculating the total number of hydrogen recombiners using the hydrogen generation-compound model specifically includes:

[0027] (1) Start by initializing the parameters, setting t = 0, n = 1,

[0028] (2) According to formula F H2 (t+1)=F H2 (t)+F release (t)-F recom (t), let t = t + Δt, and perform iterative calculation, where:

[0029] ——the volume fraction of hydrogen in the containment at time t;

[0030] n——the total number of hydrogen recombiners;

[0031] F release (t)——the volume fraction of hydrogen released at time t;

[0032] F recom (t)——the volume fraction of composite hydrogen at time t;

[0033] T——hydrogen release time, s;

[0034] Δt——time step, s;

[0035] (3) Determine whether t is less than T, where:

[0036] If so, that is, t<T, then update F recom (t), and return to step (2) to continue iterative calculation;

[0037] If not, that is, t ≥ T, then further determine F H2 (t) Is <10%, where:

[0038] If not, then F H2 (t) ≥ 10%, then set n = n + 1, t = 0, and update F recom (t), and return to step (2) to continue iterative calculation;

[0039] If so, F H2 (t)<10%, then the process ends, and n at this time is the total number of hydrogen recombiners.

[0040] Optionally, the accident selection basis for selecting the severe accident sequence includes:

[0041] 1) The selected accident sequence includes important accident types in the safety analysis of nuclear power plants, including main pipeline rupture, coolant leakage, power loss, and heat sink loss;

[0042] 2) considering the most unfavorable hydrogen source characteristics, wherein the most unfavorable hydrogen source characteristics include large amount and large release rate;

[0043] 3) Covering the most unfavorable containment conditions, including low possibility of hydrogen convection.

[0044] Optionally, the step of performing risk analysis on the selected severe accident sequence to determine the hydrogen risk compartment comprises the following steps:

[0045] Build a severe accident analysis model for nuclear power plants;

[0046] Based on the severe accident analysis model of nuclear power plants, the selected severe accident sequences are calculated, and the deflagration-combustion transition risk of each compartment under various accident conditions is analyzed;

[0047] Identify hydrogen risk compartments based on the risk of deflagration-explosion transition.

[0048] Optionally, the performing of a sensitivity analysis on the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment specifically includes the following steps:

[0049] First, the DDT risk probability curve in the compartment is calculated as the number of hydrogen recombiners increases;

[0050] Then, based on engineering judgment, the number of hydrogen recombiners in the compartment is determined according to the DDT risk probability curve, the size of the compartment space, and the cost of the hydrogen recombiners.

[0051] In a second aspect, the present invention provides a design system for a hydrogen recombiner arrangement scheme in a nuclear power plant containment, comprising:

[0052] A first processing module is used to determine the total number of hydrogen recombiners;

[0053] The second processing module specifically includes a selection unit, a risk analysis unit and a third calculation unit, wherein: the selection unit is used to select a severe accident sequence; the risk analysis unit is connected to the selection unit and is used to perform risk analysis on the selected severe accident sequence to determine the hydrogen risk compartment; the third calculation unit is connected to the risk analysis unit and is used to perform sensitivity analysis on the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment;

[0054] The third processing module is connected to the first processing module and the second processing module respectively, and is used to determine the arrangement plan of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

[0055] Optionally, the system further includes:

[0056] The effectiveness analysis module is connected to the third processing module and is used to perform effectiveness analysis on the hydrogen recombiner arrangement scheme.

[0057] Optionally, the first processing module includes:

[0058] Parameter analysis unit, used to analyze severe accident phenomena in nuclear power plants and identify uncertain parameters that affect hydrogen concentration;

[0059] A sampling unit, connected to the parameter analysis unit, for sampling the uncertainty parameters;

[0060] A first calculation unit, connected to the sampling unit, is used to perform uncertainty calculation of hydrogen concentration to obtain the volume concentration of hydrogen in the containment;

[0061] The second calculation unit is connected to the first calculation unit, and is used to build a hydrogen generation-recombination model based on the hydrogen concentration, and calculate the total number of hydrogen recombiners using the hydrogen generation-recombination model.

[0062] In a third aspect, the present invention provides a design system for a hydrogen recombiner layout scheme within a nuclear power plant containment, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to implement the design method for a hydrogen recombiner layout scheme within a nuclear power plant containment as described above.

[0063] Beneficial effects:

[0064] The design method of the arrangement scheme of hydrogen recombiner in the containment of a nuclear power plant of the present invention,

[0065] The system first determines the total number of hydrogen recombiners; then determines the number of hydrogen recombiners in the compartment, including selecting a severe accident sequence, performing a risk analysis on the selected severe accident sequence, determining a hydrogen risk compartment, performing a sensitivity analysis on the number of hydrogen recombiners in the risk compartment, and determining the number of hydrogen recombiners in the compartment; finally, according to the total number of hydrogen recombiners and the number of recombiners in each compartment, determines the hydrogen recombiner layout scheme, which can be used to guide the layout of the hydrogen recombiner scheme, solve the problem of lack of a standard hydrogen recombiner layout scheme design process in the prior art, improve the effectiveness of the hydrogen recombiner layout scheme, ensure that the hydrogen in the containment can be eliminated after a severe accident in the nuclear power plant, thereby avoiding slow combustion, fast combustion, combustion and explosion, etc. after a severe accident in the nuclear power plant, and ensuring the integrity of the containment. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a flow chart of a design method for a hydrogen recombiner arrangement scheme in a nuclear power plant containment vessel according to Embodiment 1 of the present invention;

[0067] Figure 2 This is a flow chart for determining the number of hydrogen recombiners in a compartment in Example 1 of the present invention;

[0068] Figure 3 This is a flow chart for determining the total number of hydrogen recombiners in Example 1 of the present invention;

[0069] Figure 4 is a calculation flow chart for determining the total number of hydrogen recombiners in Example 1 of the present invention;

[0070] Figure 5This is a schematic diagram of the structure of a design system for the arrangement of a hydrogen recombiner in a nuclear power plant containment vessel according to Embodiment 2 of the present invention;

[0071] Figure 6 This is a schematic diagram of the structure of the second processing module in Embodiment 2 of the present invention;

[0072] Figure 7 This is a schematic diagram of the structure of the first processing module in Embodiment 2 of the present invention;

[0073] Figure 8 This is a structural schematic diagram of a design system for a hydrogen recombiner arrangement scheme within a nuclear power plant containment vessel according to Example 3 of the present invention.

[0074] In the figure: 10, first processing module; 11, parameter analysis unit; 12, sampling unit; 13, first calculation unit; 14, second calculation unit; 20, second processing module; 21, selection unit; 22, risk analysis unit; 23, third calculation unit; 30, third processing module; 40, effectiveness analysis module; 51, memory; 52 processor. DETAILED DESCRIPTION

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] Example 1

[0084] like Figure 1 , Figure 2 As shown, this embodiment discloses a design method for a hydrogen recombiner arrangement scheme in a nuclear power plant containment, the method comprising:

[0085] Step 1, determining the total number of hydrogen recombiners;

[0086] In some embodiments, Figure 3 As shown, the determination of the total number of hydrogen recombiners comprises the following steps:

[0087] Step 1-1, conduct severe accident phenomenon analysis of nuclear power plants and identify uncertainty parameters affecting hydrogen concentration;

[0088] Step 1-2, sampling the uncertainty parameters;

[0089] Step 1-3, performing uncertainty calculation of hydrogen concentration to obtain the volume concentration of hydrogen in the containment;

[0090] Step 1-4, build a hydrogen generation-recombination model based on hydrogen concentration, and use the hydrogen generation-recombination model to calculate the total number of hydrogen recombiners.

[0091] In some embodiments, the uncertainty parameters include containment pressure, hydrogen release time, core zirconium loading, containment volume, containment temperature and other parameters, which are identified through analysis results combined with engineering experience and expert judgment.

[0092] In some embodiments, the sampling of the uncertainty parameter may be performed using a Latin hypercube method, and the number of samples is implemented with reference to the Wilks sampling theory. Specifically, the number of samples for sampling the uncertainty parameter is calculated according to the following formula:

[0093] β=1-γ N

[0094] In the formula, β is the confidence level, N is the number of samplings, and γ is the probability. When γ and β are both 95%, we get N = 59, that is, the minimum number of samplings is 59, which can meet the "95 / 95 criterion".

[0095] In some embodiments, the uncertainty calculation of hydrogen concentration to obtain the hydrogen volume concentration in the containment vessel comprises the following steps:

[0096] (1) Calculate the volume V of hydrogen under standard conditions;

[0097] Specifically, based on the zirconium-water reaction equation and the amount of zirconium in the reactor m (kg), the hydrogen volume V (m 3 ), where the zirconium water reaction equation is:

[0098] Zr+2H 2 O→ZrO 2 +2H 2 ↑

[0099] (2) Based on the sampling sensitivity parameters and the hydrogen volume V under standard conditions, the hydrogen volume concentration in the containment is calculated.

[0100] In this embodiment, the sensitive parameters include containment pressure, containment temperature, core zirconium loading and containment volume, but are not limited thereto.

[0101] In some embodiments, a hydrogen generation-compound model is built based on hydrogen concentration, and the total number of hydrogen recombiners is calculated using the hydrogen generation-compound model. The entire calculation process is guided by a 10% hydrogen concentration risk to meet the regulatory requirement that the hydrogen concentration in the containment cannot exceed 10%.

[0102] Specifically, the total number of hydrogen recombiners is calculated as follows: Figure 4 As shown, the following steps are included:

[0103] (1) Start by initializing the parameters, setting t = 0, n = 1,

[0104] (2) According to formula F H2 (t+1)=F H2 (t)+F release (t)-F recom (t), let t = t + Δt, and perform iterative calculation, where:

[0105] ——the volume fraction of hydrogen in the containment at time t;

[0106] n——the total number of hydrogen recombiners;

[0107] F release (t)——the volume fraction of hydrogen released at time t;

[0108] F recom (t)——the volume fraction of composite hydrogen at time t;

[0109] T——hydrogen release time, s;

[0110] Δt——time step, s.

[0111] (3) Determine whether t is less than T, where:

[0112] If so, that is, t<T, then update F recom (t), and return to step (2) to continue iterative calculation;

[0113] If not, that is, t ≥ T, then further determine F H2 (t) Is <10%, where:

[0114] If not, then F H2 (t) ≥ 10%, then set n = n + 1, t = 0, and update F recom (t), and return to step (2) to continue iterative calculation;

[0115] If so, F H2 (t)<10%, then the process ends, and n at this time is the total number of hydrogen recombiners.

[0116] Step 2, determine the number of hydrogen recombiners in the compartment, such as Figure 2 As shown, specifically including:

[0117] Step 2-1, select severe accident sequences.

[0118] In some implementations, the accident selection basis for selecting a severe accident sequence includes:

[0119] 1) The selected accident sequence includes important accident types in the safety analysis of nuclear power plants, including main pipeline rupture, coolant leakage, power loss, heat sink loss, etc.;

[0120] 2) considering the most unfavorable hydrogen source characteristics, wherein the most unfavorable hydrogen source characteristics include large quantity, large release rate, etc.;

[0121] 3) Covering the most unfavorable containment operating conditions, including conditions where the possibility of hydrogen convection is small.

[0122] Step 2-2: Conduct risk analysis on the selected severe accident sequences and determine the hydrogen risk compartments.

[0123] In some embodiments, performing risk analysis on the selected severe accident sequence to determine the hydrogen risk compartment comprises the following steps:

[0124] Build a severe accident analysis model for nuclear power plants;

[0125] Based on the severe accident analysis model of nuclear power plants, the selected severe accident sequences are calculated and the deflagration-detonation transition (DDT) risk of each compartment under various accident conditions is analyzed;

[0126] Identify hydrogen risk compartments based on the risk of deflagration-explosion transition.

[0127] In this embodiment, an integrated program (such as MAAP, full name Modular Accident Analysis Program) is specifically used to build a nuclear power plant severe accident analysis model to calculate the selected severe accident sequence. The DDT risk analysis calculation can be specifically referred to the Sherman-Berman method, which is not described here one by one.

[0128] Step 2-3, conduct a sensitivity analysis on the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment.

[0129] In some embodiments, the sensitivity analysis of the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment can comprehensively consider the DDT risk benefits brought by different numbers of hydrogen recombiners, the space and economy of the compartment, which includes the following steps:

[0130] First, the DDT risk probability curve in the compartment is calculated as the number of hydrogen recombiners increases;

[0131] Then, based on engineering judgment, the number of hydrogen recombiners in the compartment is determined according to the DDT risk probability curve, the size of the compartment space, and the cost of the hydrogen recombiners.

[0132] Step 3: Determine the layout plan of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

[0133] It should be noted that the arrangement of the hydrogen recombiners in this embodiment includes two aspects: 1) the total number of hydrogen recombiners; 2) the number of hydrogen recombiners in each compartment, without considering the specific position of the recombiners in the compartment.

[0134] In some embodiments, Figure 1 As shown, the method also includes:

[0135] Step 4: Analyze the effectiveness of the hydrogen recombiner layout plan.

[0136] Specifically, an integrated program is used to establish a severe accident analysis model for nuclear power plants, taking into account the layout of the hydrogen recombiner. For example, the hydrogen concentration in the large space and the DDT risk in the compartment are mainly considered, and the effectiveness of the hydrogen recombiner layout plan is analyzed.

[0137] The design method of the arrangement scheme of hydrogen recombiners in the containment of a nuclear power plant disclosed in the present embodiment first determines the total number of hydrogen recombiners; then determines the number of hydrogen recombiners in a compartment, including selecting a severe accident sequence, performing a risk analysis on the selected severe accident sequence, determining a hydrogen risk compartment, performing a sensitivity analysis on the number of hydrogen recombiners in the risk compartment, and determining the number of hydrogen recombiners in the compartment; finally, determining the arrangement scheme of hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment, which can be used to guide the arrangement of hydrogen recombiner schemes, solve the problem of lack of a standard hydrogen recombiner arrangement scheme design process in the prior art, improve the effectiveness of the hydrogen recombiner arrangement scheme, ensure that hydrogen in the containment can be eliminated after a severe accident occurs in the nuclear power plant, thereby avoiding slow combustion, fast combustion, combustion and explosion, etc. after a severe accident occurs in the nuclear power plant, and ensuring the integrity of the containment.

[0138] Example 2

[0139] like Figure 5 , Figure 6 As shown, this embodiment discloses a design system for a layout scheme of a hydrogen recombiner in a containment of a nuclear power plant, which is used to execute the design method for a layout scheme of a hydrogen recombiner in a containment of a nuclear power plant, including:

[0140] A first processing module 10 is used to determine the total number of hydrogen recombiners;

[0141] The second processing module 20 specifically includes a selection unit 21, a risk analysis unit 22 and a third calculation unit 23, wherein: the selection unit 21 is used to select a severe accident sequence; the risk analysis unit 22 is connected to the selection unit 21, and is used to perform a risk analysis on the selected severe accident sequence to determine the hydrogen risk compartment; the third calculation unit 23 is connected to the risk analysis unit 22, and is used to perform a sensitivity analysis on the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment;

[0142] The third processing module 30 is connected to the first processing module 10 and the second processing module 20 respectively, and is used to determine the arrangement scheme of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

[0143] In some embodiments, Figure 7 As shown, the first processing module 10 includes:

[0144] A parameter analysis unit 11 is used to analyze severe accident phenomena of nuclear power plants and identify uncertain parameters that affect hydrogen concentration;

[0145] A sampling unit 12, connected to the parameter analysis unit 11, for sampling the uncertainty parameters;

[0146] The first calculation unit 13 is connected to the sampling unit 12 and is used to calculate the uncertainty of the hydrogen concentration to obtain the volume concentration of hydrogen in the containment;

[0147] The second calculation unit 14 is connected to the first calculation unit 13, and is used to build a hydrogen generation-recombination model based on the hydrogen concentration, and calculate the total number of hydrogen recombiners using the hydrogen generation-recombination model.

[0148] In some embodiments, Figure 5 As shown, the system also includes:

[0149] The effectiveness analysis module 40 is connected to the third processing module 30 and is used to perform effectiveness analysis on the hydrogen recombiner arrangement scheme.

[0150] Example 3

[0151] like Figure 8 As shown, this embodiment discloses a design system for a hydrogen recombiner layout scheme in a nuclear power plant containment, comprising a memory 51 and a processor 52, wherein the memory 51 stores a computer program, and the processor 52 is configured to run the computer program to implement a design method for a hydrogen recombiner layout scheme in a nuclear power plant containment as described in Example 1.

[0152] The memory 51 is connected to the processor 52 . The memory 51 may be a flash memory, a read-only memory or other memory. The processor 52 may be a central processing unit or a single-chip microcomputer.

[0153] The design system of the arrangement scheme of hydrogen recombiners in the containment of a nuclear power plant disclosed in Examples 2 and 3 first determines the total number of hydrogen recombiners; then determines the number of hydrogen recombiners in a compartment, including selecting a severe accident sequence, performing a risk analysis on the selected severe accident sequence, determining a hydrogen risk compartment, performing a sensitivity analysis on the number of hydrogen recombiners in the risk compartment, and determining the number of hydrogen recombiners in the compartment; finally, according to the total number of hydrogen recombiners and the number of recombiners in each compartment, determines the arrangement scheme of hydrogen recombiners, which can be used to guide the arrangement of hydrogen recombiners, solve the problem of lack of a standard design process for the arrangement scheme of hydrogen recombiners in the prior art, improve the effectiveness of the arrangement scheme of hydrogen recombiners, ensure that the hydrogen in the containment can be eliminated after a severe accident in the nuclear power plant, thereby avoiding slow combustion, fast combustion, combustion and explosion, etc. after a severe accident in the nuclear power plant, and ensuring the integrity of the containment.

[0154] 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 design method for the arrangement of a hydrogen recombiner in a containment of a nuclear power plant, characterized in that: include: Step 1, determining the total number of hydrogen recombiners; Step 2, determining the number of hydrogen recombiners in the compartment, includes: Step 2-1, selecting a severe accident sequence; Step 2-2, conduct risk analysis on the selected severe accident sequence and determine the hydrogen risk compartment; Step 2-3, conduct a sensitivity analysis of the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment; Step 3: Determine the layout plan of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

2. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 1, characterized in that: Also includes: Step 4: Analyze the effectiveness of the hydrogen recombiner layout plan.

3. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 1 or 2, characterized in that: Determining the total number of hydrogen recombiners comprises the following steps: Conduct severe accident phenomenon analysis of nuclear power plants and identify uncertainty parameters affecting hydrogen concentration; Sampling of uncertainty parameters; Carry out uncertainty calculation of hydrogen concentration to obtain the volume concentration of hydrogen in the containment; A hydrogen generation-recombination model is built based on the hydrogen concentration, and the total number of hydrogen recombiners is calculated using the hydrogen generation-recombination model.

4. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 3, characterized in that: The uncertain parameters include containment pressure, hydrogen release time, core zirconium loading, containment volume, and containment temperature.

5. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 3, characterized in that: The number of samples for sampling the uncertainty parameter is calculated according to the following formula: β=1-γ N In the formula, β is the confidence level, N is the number of samples, and γ is the probability.

6. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 3, characterized in that: The uncertainty calculation of hydrogen concentration is performed to obtain the volume concentration of hydrogen in the containment vessel, comprising the following steps: Calculate the volume V of hydrogen under standard conditions; The hydrogen volume concentration in the containment is calculated based on the sampling sensitivity parameters and the hydrogen volume V under standard conditions.

7. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 3, characterized in that: The hydrogen generation-compound model is established based on the hydrogen concentration, and the total number of hydrogen recombiners is calculated using the hydrogen generation-compound model, specifically including: (1) Start by initializing the parameters, setting t = 0, n = 1, (2) According to formula F H2 (t+1)=F H2 (t)+F release (t)-F recom (t), let t = t + Δt, and perform iterative calculation, where: ——the volume fraction of hydrogen in the containment at time t; n——the total number of hydrogen recombiners; F release (t)——the volume fraction of hydrogen released at time t; F recom (t)——the volume fraction of composite hydrogen at time t; T——hydrogen release time, s; Δt——time step, s; (3) Determine whether t is less than T, where: If so, that is, t<T, then update F recom (t), and return to step (2) to continue iterative calculation; If not, that is, t ≥ T, then further determine F H2 (t) Is <10%, where: If not, then F H2 (t) ≥ 10%, then set n = n + 1, t = 0, and update F recom (t), and return to step (2) to continue iterative calculation; If so, F H2 (t)<10%, then the process ends, and n at this time is the total number of hydrogen recombiners.

8. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 1 or 2, characterized in that: The accident selection basis for selecting the severe accident sequence includes: 1) The selected accident sequence includes important accident types in the safety analysis of nuclear power plants, including main pipeline rupture, coolant leakage, power loss, and heat sink loss; 2) considering the most unfavorable hydrogen source characteristics, wherein the most unfavorable hydrogen source characteristics include large amount and large release rate; 3) Covering the most unfavorable containment conditions, including low possibility of hydrogen convection.

9. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 1 or 2, characterized in that: The risk analysis of the selected severe accident sequence to determine the hydrogen risk compartment includes the following steps: Build a severe accident analysis model for nuclear power plants; Based on the severe accident analysis model of nuclear power plants, the selected severe accident sequences are calculated, and the deflagration-combustion transition risk of each compartment under various accident conditions is analyzed; Identify hydrogen risk compartments based on the risk of deflagration-explosion transition.

10. The design method for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 1 or 2, characterized in that: The sensitivity analysis of the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment specifically includes the following steps: First, the DDT risk probability curve in the compartment is calculated as the number of hydrogen recombiners increases; Then, based on engineering judgment, the number of hydrogen recombiners in the compartment is determined according to the DDT risk probability curve, the size of the compartment space, and the cost of the hydrogen recombiners.

11. A design system for the arrangement of hydrogen recombiners in the containment of a nuclear power plant, characterized in that: include: A first processing module (10) is used to determine the total number of hydrogen recombiners; The second processing module (20) specifically comprises a selection unit (21), a risk analysis unit (22) and a third calculation unit (23), wherein: the selection unit is used to select a severe accident sequence; the risk analysis unit is connected to the selection unit and is used to perform a risk analysis on the selected severe accident sequence to determine a hydrogen risk compartment; the third calculation unit is connected to the risk analysis unit and is used to perform a sensitivity analysis on the number of hydrogen recombiners in the risk compartment to determine the number of hydrogen recombiners in the compartment; The third processing module (30) is connected to the first processing module and the second processing module respectively, and is used to determine the arrangement plan of the hydrogen recombiners according to the total number of hydrogen recombiners and the number of recombiners in each compartment.

12. The design system for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 11, characterized in that: Also includes: The effectiveness analysis module (40) is connected to the third processing module and is used to perform effectiveness analysis on the hydrogen recombiner arrangement scheme.

13. The design system for the arrangement of hydrogen recombiners in the containment of a nuclear power plant according to claim 11 or 12, characterized in that: The first processing module comprises: A parameter analysis unit (11), used for analyzing severe accident phenomena of nuclear power plants and identifying uncertain parameters affecting hydrogen concentration; A sampling unit (12), connected to the parameter analysis unit, for sampling the uncertainty parameter; A first calculation unit (13), connected to the sampling unit, is used to calculate the uncertainty of hydrogen concentration to obtain the volume concentration of hydrogen in the containment; The second calculation unit (14) is connected to the first calculation unit and is used to build a hydrogen generation-recombination model based on the hydrogen concentration, and calculate the total number of hydrogen recombiners using the hydrogen generation-recombination model.

14. A design system for the arrangement of hydrogen recombiners in the containment of a nuclear power plant, characterized in that: The invention comprises a memory (51) and a processor (52), wherein the memory stores a computer program, and the processor is configured to run the computer program to execute a design method for a hydrogen recombiner arrangement scheme in a nuclear power plant containment vessel as claimed in any one of claims 1 to 10.

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