A simulation method and simulation device for hydrogen deflagration-to-detonation transition probability in a containment, and a readable storage medium

Abstract

The present application relates to a kind of simulation method, simulation equipment and readable storage medium of hydrogen gas combustion explosion transition probability in containment.The simulation method includes the following steps: according to the geometric feature of the compartment in containment, the geometric structure grading of compartment and the level of belonging are determined;According to the explosion unit width of mixture, the category of mixture is determined;Based on the geometric structure grading of compartment and the category of mixture, the grading of hydrogen gas combustion explosion transition caused in compartment is determined, and the level failure probability CFP is distributed;The discrete probability distribution CPD of each category of mixture of compartment is calculated;Based on the level failure probability CFP and the discrete probability distribution CPD, the probability of hydrogen gas combustion explosion transition caused in containment is calculated.The present application can effectively support the evaluation of combustion explosion risk in containment.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant simulation technology, and in particular to a simulation method, simulation equipment, and readable storage medium for the hydrogen combustion and explosion transition probability inside a containment. Background Technology

[0002] In the event of a severe accident at a pressurized water reactor nuclear power plant, the fuel cladding may undergo a violent reaction with the reactor's coolant water and steam, producing a large amount of hydrogen. This hydrogen will be released into the containment vessel through breaches and primary circuit depressurization valves. The mixture of hydrogen with steam and air within the containment vessel can lead to rapid combustion or even an explosion. The hydrogen explosion in the Fukushima nuclear accident damaged the power plant, releasing large amounts of radioactive material into the environment and causing severe pollution. Therefore, assessing the risk of hydrogen combustion and explosion within the containment vessel during the design and operation of nuclear power plants is essential to ensure plant safety.

[0003] Currently, Shapiro diagrams and the λ criterion are commonly used to determine the occurrence of hydrogen deflagration-to-detonation transition (DDT). The Shapiro diagram is a ternary characteristic curve relating hydrogen, water vapor, and air concentrations, evaluating the potential combustion risk of hydrogen based on the gas composition within the compartment. The λ criterion provides a formula for the relationship between parameters such as hydrogen, water vapor, and air concentrations, as well as the geometric dimensions of the compartment. The hydrogen combustion state is assessed by comparing the criterion number with the value 1. These methods, from a deterministic analysis perspective, are used to assess whether hydrogen deflagration-to-detonation transition will occur within the compartment. However, for structurally complex systems such as nuclear power plant containment structures, relying solely on Shapiro diagrams and the λ criterion to determine the probability of hydrogen deflagration-to-detonation transition is quite difficult. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this invention proposes a simulation method, simulation equipment, and readable storage medium for the simulation of the probability of hydrogen combustion and explosion within a containment, which can be used to support the assessment of combustion and explosion risks within a containment.

[0005] Specifically, this invention proposes a simulation method for the probability of hydrogen combustion and explosion transition within a containment, comprising the following steps:

[0006] The geometric structure classification and level of the compartments within the containment are determined based on their geometric characteristics.

[0007] The category of the mixture is determined based on the width of the explosive cells of the mixture;

[0008] Based on the geometric classification of the compartment and the category of the mixture, the classification of the hydrogen combustion-detonation transition within the compartment is determined and the probability of failure (CFP) is assigned.

[0009] Calculate the discrete probability distribution (CPD) of each category of the mixture in the compartment;

[0010] Based on the failure probability level (CFP) and discrete probability distribution (CPD) mentioned above, the probability of hydrogen combustion and explosion transformation occurring inside the containment is calculated.

[0011] According to an embodiment of the present invention, determining the geometric structural hierarchy and level of the compartment includes the following steps:

[0012] The degree of flame acceleration within the compartment is determined based on the geometric characteristics of the compartment within the containment, and the geometric structure of the compartment is graded based on the degree of flame acceleration. The geometric characteristics include geometric dimensions, obstacles, pipe sizes, and ventilation opening locations.

[0013] The level of the compartment is determined based on its geometric structure and geometric features.

[0014] According to one embodiment of the present invention, determining the classification of the hydrogen combustion-detonation transition within the compartment and assigning the probability of failure (CFP) includes the following steps:

[0015] The geometry of the compartments and the category of the mixture are combined to determine the classification of each combination that triggers a hydrogen combustion-detonation transition;

[0016] Assign the failure probability (CFP) to each stage that triggers the hydrogen combustion-explosion transition.

[0017] According to an embodiment of the present invention, calculating the discrete probability distribution (CPD) of the mixture in the compartment includes the following steps:

[0018] The serious accident analysis program is used to calculate the accident evolution and obtain the range of steam concentration variation and equivalent ratio variation in the compartment.

[0019] Establish a curve relating the range of steam concentration variation to the range of equivalent ratio variation;

[0020] Based on the area share of the mixture category covered by the relationship curve, the discrete probability distribution (CPD) of the mixture category within the compartment is determined.

[0021] According to one embodiment of the present invention, the severe accident analysis program is a severe accident lumped parameter program or a three-dimensional computational fluid dynamics program for hydrogen distribution and combustion analysis.

[0022] According to one embodiment of the present invention, calculating the probability of hydrogen combustion and explosion transformation within the containment includes the following steps:

[0023] Calculate the probability of hydrogen combustion and explosion occurring within each of the compartments;

[0024] Calculate the probability of hydrogen combustion and explosion occurring inside the containment.

[0025] According to one embodiment of the present invention, the probability of hydrogen combustion and explosion occurring in each of the compartments is calculated using the following formula:

[0026] P i =∑CPD j CFP j ;

[0027] Among them, P i CPD is the probability of hydrogen combustion-detonation transformation in compartment i. j Discrete probability distribution of mixture category j, CFP j The failure probability of mixture category j.

[0028] According to one embodiment of the present invention, the probability P of the containment vessel triggering a hydrogen combustion explosion is calculated as follows:

[0029] P = 1 - (1 - P1)·(1 - P2)...(1 - P m )=1-∏(1-P i );

[0030] Where m is the total number of compartments within the containment structure.

[0031] The present invention also provides a simulation device for the probability of hydrogen combustion and explosion transformation within a containment, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the preceding simulation methods.

[0032] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the preceding simulation methods.

[0033] This invention provides a simulation method, simulation equipment, and readable storage medium for the probability of hydrogen combustion and explosion within a containment. From a probabilistic analysis perspective, it performs simulation calculations on the probability of hydrogen combustion and explosion within a nuclear power plant containment based on the compartment's geometric characteristics and the hydrogen concentration within the compartment, thereby supporting the assessment of combustion and explosion risks within the containment.

[0034] It should be understood that the above general description and the following detailed description of the present invention are exemplary and illustrative, and are intended to provide further explanation of the present invention. Attached Figure Description

[0035] The accompanying drawings are included to provide further explanation of the invention. They are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with this specification, serve to explain the principles of the invention.

[0036] In the attached image:

[0037] Figure 1 A flowchart illustrating a simulation method for the hydrogen combustion-explosion transition probability within a containment according to an embodiment of the present invention is shown.

[0038] Figure 2 A schematic diagram illustrating the calculation of the discrete probability distribution (CPD) of compartment A2 within the containment of an embodiment of the present invention is shown.

[0039] Figure 3 A system block diagram of a simulation device for the hydrogen combustion-explosion transition probability within a containment, according to an embodiment of the present invention, is shown. Detailed Implementation

[0040] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0044] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0046] Figure 1 A flowchart illustrating a simulation method for the hydrogen combustion-explosion transition probability within a containment according to an embodiment of the present invention is shown. As shown, a simulation method for the hydrogen combustion-explosion transition probability within a containment includes the following steps:

[0047] S1. Determine the geometric structure classification and level of the compartments based on their geometric characteristics within the containment. Specifically, by comprehensively considering the various geometric characteristics of different compartments, the level of each compartment is clarified. This allows for a more accurate assessment of the potential risks of different levels of compartments in the event of a hydrogen combustion explosion, providing more targeted safeguards for the safe operation of nuclear power plants.

[0048] S2. The category of a mixture is determined based on its explosive cell width. Explosive cell width is a key indicator of a mixture, reflecting its ability to sustain or propagate a hydrogen explosion. It is related to the inherent property of the hydrogen concentration in the mixture, which is denoted as the explosive cell width λ. Mixtures with a smaller λ are more prone to explosion. The explosive cell width λ is closely related to factors such as the vapor volume concentration, temperature, and equivalent ratio in the mixture. The equivalent ratio is a variable characterizing the degree of concentration equilibrium of the mixture relative to the chemical reaction, and it is related to the volume concentrations of combustibles, oxides, and their molar ratio in the chemical reaction equation. By accurately measuring the hydrogen concentration of the mixture, the equivalent ratio is calculated, and thus the explosive cell width of the mixture is determined. The category of the mixture can be determined based on the explosive cell width. Different categories of mixtures differ in terms of safety, handling methods, and potential risks; accurately determining the category of a mixture helps in understanding its potential explosion risk.

[0049] S3, based on the compartment geometry and mixture type, determines the classification of hydrogen combustion-detonation transitions within the compartment and assigns the corresponding probability of failure (CFP). By determining the classification of hydrogen combustion-detonation transitions within the compartment using its geometry and mixture type, and assigning the corresponding CFP, the risk of combustion-detonation can be assessed more accurately.

[0050] S4 calculates the discrete probability distribution (CPD) of each type of mixture within the compartment. Through detailed analysis and complex calculations of factors such as temperature, pressure, and gas composition ratio within the compartment, the probability of occurrence of each type of mixture under different conditions is determined, thereby helping to gain a more comprehensive understanding of the potential combustion and explosion risks within the compartment.

[0051] S5, based on the probability of failure level (CFP) and discrete probability distribution (CPD), calculates the probability of hydrogen combustion and explosion transformation within the containment, thereby effectively supporting the risk assessment of combustion and explosion within the containment, ensuring the safe design of nuclear power plants and ensuring the safety of subsequent operation.

[0052] In some examples, determining the geometric grading of the compartments and their corresponding levels includes the following steps:

[0053] S11. Determine the degree of flame acceleration within a compartment based on its geometric characteristics. Then, classify the compartment's geometry based on this degree of flame acceleration. Geometric characteristics include dimensions, obstructions, pipe sizes, and ventilation locations. Before a hydrogen deflagration can transition into an explosion, the flame must accelerate to a very high speed. Obstructions in the flame path can cause disturbances, thus accelerating the flame. Furthermore, factors such as compartment geometry and top openings, which can induce combustion instability, can also cause disturbances and accelerate the flame. The more top openings a compartment has, the more unenclosed it tends to be, making the hydrogen deflagration transition less likely. Compartments where hydrogen combustion is possible are classified according to their geometric characteristics based on the probability of flame acceleration, with a total of n levels. Level 1 compartments have the highest probability of flame acceleration, while level n compartments are the least likely. The probability of flame acceleration decreases as the geometric classification level increases. In this example, the compartment geometry is divided into 5 levels, as shown in Table 1.

[0054] Table 1. Geometric Structure Classification of Compartments

[0055]

[0056]

[0057] S12, determine the level of the compartment based on the geometric structure and geometric features of the compartment, refer to Table 2.

[0058] Table 2 Classification of Compartments

[0059]

[0060] In some examples, at 1 atmosphere and 20°C, mixtures were classified into five categories based on the range of explosive unit widths, with Category 1 mixtures exhibiting extremely explosive properties. The probability of explosion decreased as the mixture category increased, as shown in Table 3.

[0061] Table 3. Relationship between mixture type and explosion unit width (1 atmosphere, 20°C)

[0062]

[0063] In some examples, determining the classification of hydrogen combustion-detonation transitions within a compartment and assigning the probability of failure (CFP) to the classification includes the following steps:

[0064] S31, combine the compartment geometry classification and the mixture category to determine the classification of each combination that triggers hydrogen combustion-detonation transition. Referring to Table 4, if both the compartment geometry classification and the mixture category are level 1, then the classification of the combination triggering hydrogen combustion-detonation transition is determined to be level 1, and this combination is highly likely to cause hydrogen combustion-detonation transition (DDT); if both the compartment geometry classification and the mixture category are level 5, then the classification of the combination triggering hydrogen combustion-detonation transition is determined to be level 5, and the probability of this combination triggering hydrogen combustion-detonation transition (DDT) is extremely low.

[0065] Table 4. Classification of hydrogen combustion-detonation transitions

[0066]

[0067] S32, assign the failure probability (CFP) to each stage that triggers the hydrogen combustion-detonation transition, as shown in Table 5.

[0068] Table 5. Hydrogen combustion-explosion transition DDT level failure probability (CFP)

[0069] DDT Level The possibility of DDT Level failure probability 1 Highly likely to happen 0.99 2 It is more likely to happen 0.9 3 Possible 0.5 4 Less likely to happen 0.1 5 Extremely unlikely 0.01

[0070] From the above, the probability of failure (CFP) for hydrogen combustion-explosion transition at each compartment level can be obtained. For example, refer to Table 6 for compartment A2.

[0071] Table 6. DDT Level Failure Probability Values ​​(CFP) for Compartment A2

[0072]

[0073] In some examples, calculating the discrete probability distribution (CPD) of the mixture in the compartments includes the following steps:

[0074] S41, use the severe accident analysis program to calculate the accident evolution and obtain the range of steam concentration variation and equivalent ratio variation in the compartment;

[0075] S42, Establish the relationship curve between the range of steam concentration variation and the range of equivalent ratio variation;

[0076] S43. Based on the area share of the mixture categories covered by the relationship curve, determine the discrete probability distribution (CPD) of the mixture categories within the compartment. Specifically, by analyzing the area of ​​the mixture categories covered by the relationship curve, calculate the probability distribution of each mixture occurring within the compartment, thereby helping to gain a more comprehensive understanding of the potential combustion and explosion risks within the compartment.

[0077] In this example, taking the early reflooding accident data of a core of a passive pressurized water reactor as an example, the accident category was calculated by using the integrated severe accident analysis program, and the water vapor volume concentration range of the A2 compartment during the rapid hydrogen production stage was obtained as 0.2 to 0.3, and the equivalent ratio range was 1.0 to 4.0. Figure 2 A schematic diagram illustrating the calculation of the discrete probability distribution (CPD) of compartment A2 within the containment vessel according to an embodiment of the present invention is shown. As shown in the figure, the left vertical axis represents the width of the explosive element, and the horizontal axis represents the equivalent ratio. The four curves represent the relationship between the width of the explosive element and the equivalent ratio under different water vapor concentration conditions obtained through step S42. The mixture classification is determined based on the explosive element width, resulting in the black area shown in the figure. This black area relates to mixture categories 3 to 5. The discrete probability distribution (CPD) of the mixture categories within compartment A2 is obtained based on area share estimation, as shown in Table 7.

[0078] Table 7 Discrete Probability Distribution (CPD) of Compartment Mixture Categories in A2

[0079]

[0080] In some examples, the severe accident analysis procedure in step S41 is either a severe accident lumped parameter program or a three-dimensional computational fluid dynamics program for hydrogen distribution and combustion analysis. The severe accident lumped parameter program can analyze the accident from a macroscopic perspective, deriving the range of steam concentration variation and equivalent ratio variation within the compartment by comprehensively considering various parameters. The three-dimensional computational fluid dynamics program focuses on finely simulating fluid flow and chemical reactions within the compartment, accurately obtaining the range of steam concentration and equivalent ratio variation under different conditions.

[0081] In some examples, calculating the probability of a hydrogen combustion-detonation transition within the containment using Boolean algebra includes the following steps:

[0082] S51, based on the graded failure probability (CFP) and discrete probability distribution (CPD), calculate the probability of hydrogen combustion and explosion transformation in each compartment;

[0083] S52, calculate the probability of hydrogen combustion and explosion occurring inside the containment.

[0084] In some examples, the probability of a hydrogen combustion-detonation transition occurring in each compartment is calculated using the following formula:

[0085] P i =∑CPD j CFP j ;

[0086] Among them, P i CPD is the probability of hydrogen combustion-detonation transformation in compartment i. j Let CPD and CFP be the discrete probability distributions of mixture category j.j The probability of failure (CPD) of mixture category j.

[0087] In this example, referring to Table 8, based on the Class Failure Probability (CFP) and Discrete Probability Distribution (CPD) of compartment A2 obtained in the previous example, the probability of compartment A2 initiating a hydrogen combustion-detonation transition is calculated to be 0.193. Using the same method, the Class Failure Probability (CFP) and Discrete Probability Distribution (CPD) of compartment A6 can be obtained, and the probability of compartment A6 initiating a hydrogen combustion-detonation transition is calculated to be 0.01.

[0088] Table 8. Probability of DDT occurring in the containment structure under different types of early reflooding accidents.

[0089]

[0090] In some examples, the probability P of the containment vessel triggering a hydrogen combustion-explosion transition is calculated as follows:

[0091] P = 1 - (1 - P1)·(1 - P2)...(1 - P m )=1-∏(1-P i );

[0092] Where m is the total number of compartments within the containment.

[0093] Taking the aforementioned compartments A2 and A6 as examples, considering both compartments A2 and A6, the probability of hydrogen combustion-explosion transition (DDT) in the containment under the early reflooding accident category is approximately 0.201.

[0094] Figure 3A system block diagram of a simulation device for the probability of hydrogen combustion and explosion within a containment according to an embodiment of the present invention is shown. As shown, the simulation device 300 may include an internal communication bus 301, a processor 302, a read-only memory (ROM) 303, a random access memory (RAM) 304, and a communication port 305. When applied to a personal computer, the simulation device 300 may also include a hard disk 306. The internal communication bus 301 enables data communication between the components of the simulation device 300. The processor 302 can make judgments and issue prompts. In some embodiments, the processor 302 may consist of one or more processors. The communication port 305 enables data communication between the simulation device 300 and external devices. In some embodiments, the simulation device 300 can send and receive information and data from a network through the communication port 305. The simulation device 300 may also include different forms of program storage units and data storage units, such as the hard disk 306, the read-only memory (ROM) 303, and the random access memory (RAM) 304, capable of storing various data files used for computer processing and / or communication, as well as possible program instructions executed by the processor 302. Processor 302 executes these instructions to implement the main part of the method. The results processed by processor 302 are transmitted to the user equipment via communication port 305 and displayed on the user interface.

[0095] The above simulation method can be implemented as a computer program, stored in the hard disk 306, and loaded into the processor 302 for execution to implement the simulation method of this application.

[0096] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the aforementioned simulation methods for the probability of hydrogen combustion and explosion within a containment.

[0097] The specific implementation methods and technical effects of the simulation equipment and computer-readable storage medium used for the hydrogen combustion and explosion transition probability inside the containment can be found in the embodiments of the simulation method for the hydrogen combustion and explosion transition probability inside the containment provided by the present invention, and will not be repeated here.

[0098] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, circuits, and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps are described above in a generalized manner in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the invention.

[0099] The various illustrative logic modules and circuits described in conjunction with the embodiments disclosed herein may be implemented or performed using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, it may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0100] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor such that the processor can read and write information to / from the storage medium. In an alternative, the storage medium may be integrated into the processor. The processor and storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and storage medium may reside as discrete components in the user terminal.

[0101] In one or more exemplary embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functionality may be stored or transmitted as one or more instructions or code on or through a computer-readable medium. A computer-readable medium includes both computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. A storage medium may be any available medium accessible to a computer. By way of example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a computer. Any connection is also legitimately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of a medium. As used in this article, disk and disc include compact discs (CDs), laser discs, optical discs, digital multi-purpose discs (DVDs), floppy disks, and Blu-ray discs. Disks typically reproduce data magnetically, while discs reproduce data optically using lasers. Combinations of these should also be included within the scope of computer-readable media.

[0102] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments described above without departing from the spirit and scope of the invention. Therefore, it is intended that this invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A simulation method for hydrogen deflagration transition probability in a containment, comprising steps of: determining geometric structure classification of a compartment in the containment and a classification thereof according to geometric features of the compartment; determining a category of a mixture according to an explosion cell width of the mixture; determining a classification of hydrogen deflagration transition in the compartment and assigning a classification failure probability CFP based on the geometric structure classification of the compartment and the category of the mixture, comprising steps of: combining the geometric structure classification of the compartment and the category of the mixture to determine a classification of hydrogen deflagration transition for each combination; assigning a classification failure probability CFP to each classification of hydrogen deflagration transition; calculating discrete probability distribution CPD of each category of the mixture in the compartment, comprising steps of: performing calculation of accident evolution by using a severe accident analysis program to obtain a steam concentration variation range and an equivalent ratio variation range in the compartment; establishing a relationship curve between the steam concentration variation range and the equivalent ratio variation range; determining the discrete probability distribution CPD of the category of the mixture in the compartment based on an area fraction of the category of the mixture covered by the relationship curve; calculating a probability of hydrogen deflagration transition in the containment based on the classification failure probability CFP and the discrete probability distribution CPD, comprising calculating a probability of hydrogen deflagration transition in each compartment and calculating a probability of hydrogen deflagration transition in the containment; wherein a calculation formula of the probability of hydrogen deflagration transition in each compartment is: P i = ∑CPD j CFP j ; where P i is the probability of a hydrogen deflagration transition for compartment i, CPD r is the discrete probability distribution for mixture class j, CFP j is the order failure probability for mixture class j; a calculation formula of the probability P of hydrogen deflagration transition in the containment is: P=1-(1-P1)·(1-P2)…(1-P m )=1-∏(1-P i ); wherein m is a total number of compartments in the containment.

2. The simulation method of claim 1, wherein, determining the geometric structure classification of the compartment and the classification thereof, comprising steps of: determining a degree of flame acceleration in the compartment according to geometric features of the compartment, determining the geometric structure classification of the compartment based on the degree of flame acceleration, the geometric features including geometric size, obstacle, pipe size and vent location; determining the classification of the compartment based on the geometric structure classification and the geometric features of the compartment.

3. The simulation method of claim 1, wherein, The severe accident analysis program is a severe accident lumped parameter program or a three-dimensional computational fluid dynamics program for hydrogen distribution and combustion analysis.

4. A simulation device for hydrogen deflagration to detonation transition probability in a containment vessel, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the steps of the simulation method of any one of claims 1-3 when executing the computer program.

5. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by the processor, implements the steps of the simulation method of any one of claims 1-3.

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