Design method and device of safe injection system, storage medium and computer equipment

Abstract

The invention discloses a design method and device of a safety injection system, a storage medium and computer equipment, and mainly aims to solve the problem of how to design the safety injection system meeting the established safety target of a floating reactor in a limited space, and the design method comprises the following steps: constructing a single-row safety injection scheme comprising a water tank, an isolating valve, a pump and a check valve, establishing a corresponding single-row fault tree; a first system failure probability corresponding to the single-column safety injection scheme is determined based on the single-column fault tree. Judging whether the first system failure probability meets safety requirements or not; if yes, determining the single-row safety injection scheme as a safety injection system design scheme; if not, constructing a multi-column safety injection scheme based on multiple connection modes, and respectively establishing a multi-column fault tree corresponding to each multi-column safety injection scheme; determining a second system failure probability based on the multi-column fault tree; and determining a safety injection system design scheme from each multi-column safety injection scheme based on the second system failure probability.

Description

Technical Field

[0001] The present invention relates to the field of nuclear energy safety technology, and in particular to a design method and device, storage medium, and computer equipment for a safety injection system. Background Art

[0002] Maintaining the water level of the reactor coolant system is one of the basic safety functions of floating reactors. When the reactor coolant system or the pipes connected to it that are not isolated by isolation valves are breached, the coolant in the reactor coolant system will be lost quickly. As the water level of the reactor coolant system decreases, the reactor core may be exposed, and the fuel elements in the exposed core may heat up rapidly. If the fuel elements are not cooled again in time, the fuel elements may face the risk of burning, and the consequences of the accident will be further worsened.

[0003] The main system for dealing with the loss of coolant system accident is the safety injection system. The safety injection system can provide water to the reactor coolant system in the event of a loss of coolant. A sufficient flow of water will quickly submerge the exposed core, allowing the fuel elements to be recooled and ending the process of the accident. At present, the design method of the safety injection system of land-based nuclear power plants is relatively mature. However, when designing the safety injection system of a floating reactor, due to the influence of the floating reactor containment space and the floating platform load, the design method of the safety injection system of a land-based nuclear power plant cannot be fully referenced. Therefore, there is an urgent need for a safety injection system that meets the established safety goals of a floating reactor under limited space and load. Summary of the invention

[0004] In view of this, the present invention provides a design method and device for a safety injection system, a storage medium, and a computer device, the main purpose of which is to solve the problem of how to design a safety injection system that meets the established safety goals of a floating reactor in a limited space.

[0005] According to one aspect of the present invention, a design method for a safe injection system is provided, comprising:

[0006] Constructing a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and establishing a corresponding single-column fault tree based on the single-column safety injection scheme;

[0007] Determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judge whether the first system failure probability meets the safety requirements;

[0008] If the failure probability of the first system meets the safety requirement, determining the single-column safety injection scheme as the safety injection system design scheme;

[0009] If the failure probability of the first system does not meet the safety requirement, construct multiple columns of safety injection schemes corresponding to various connection modes based on various connection modes of the water tank, the isolation valve, the pump and the check valve, and respectively establish multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes;

[0010] The second system failure probabilities corresponding to the plurality of safety injection schemes are determined based on the plurality of fault trees respectively; and the safety injection system design scheme is determined from the plurality of safety injection schemes based on the second system failure probabilities.

[0011] Furthermore, the establishing of a corresponding single-column fault tree based on the single-column safety injection scheme includes:

[0012] Determine the device level corresponding to each device according to the connection sequence between each device in the single-column safety injection scheme;

[0013] The failure mode of each device is obtained, and the single-column fault tree is established based on the device level and the failure mode corresponding to each device.

[0014] Further, the determining of the first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree includes:

[0015] Obtaining the failure probability corresponding to each failure mode in the single-column fault tree;

[0016] The failure probabilities are summed to obtain the first system failure probability.

[0017] Furthermore, before constructing multiple columns of safety injection schemes corresponding to various connection modes based on the various connection modes of the water tank, the isolation valve, the pump and the check valve, the method further includes:

[0018] Determine the space constraints of the safety injection system based on the space volume of the containment in the floating reactor;

[0019] The volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipes are obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the space constraints.

[0020] Furthermore, the multiple connection modes of the water tank, the isolation valve, the pump and the check valve are used to construct a multi-column safety injection scheme corresponding to the various connection modes, including:

[0021] Connecting a single water tank, an isolation valve, a pump and a check valve into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection scheme;

[0022] The water tank, the isolation valve, the pump and the check valve are divided into multiple sections based on the commonly connected pipelines, and the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme;

[0023] All devices except the water tank are connected in parallel according to the device level, and the parallel structures are connected in sequence through commonly connected pipes to obtain a third multi-column safety injection scheme.

[0024] Furthermore, the establishing of multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes includes:

[0025] Establishing a first multi-column fault tree including the same number of branch nodes as the number of the single column based on the first multi-column safety injection scheme;

[0026] Based on the number of nodes divided in the second plurality of columns of safety injection schemes, establishing a second plurality of columns of fault trees having the same number of branch nodes as the number of nodes;

[0027] Based on the highest equipment level in the third multi-column safety injection scheme, a third multi-column fault tree having the same number of branch nodes as that of the highest equipment level is established.

[0028] Further, the determining of the safety injection system design scheme from each of the plurality of safety injection schemes based on each of the second system failure probabilities includes:

[0029] Determine at least one failure probability of the system to be analyzed that meets the safety requirement from each of the second system failure probabilities;

[0030] The minimum value of the failure probability of the system to be analyzed is determined, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the safety injection system design scheme.

[0031] According to another aspect of the present invention, there is provided a design device for a safe injection system, comprising:

[0032] A single-column construction module is used to construct a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and to establish a corresponding single-column fault tree based on the single-column safety injection scheme;

[0033] A judgment module, configured to determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and to judge whether the first system failure probability meets safety requirements;

[0034] A first determination module, configured to determine the single-column safety injection scheme as a safety injection system design scheme if the failure probability of the first system meets the safety requirement;

[0035] a multi-column construction module, configured to construct a multi-column safety injection scheme corresponding to various connection modes of the water tank, the isolation valve, the pump and the check valve if the failure probability of the first system does not meet the safety requirement, and respectively establish a multi-column fault tree corresponding to each of the multi-column safety injection schemes;

[0036] The second determination module is used to determine the second system failure probability corresponding to each of the multiple columns of safety injection solutions based on the multiple columns of fault trees respectively; and determine the safety injection system design solution from each of the multiple columns of safety injection solutions based on each of the second system failure probabilities.

[0037] Furthermore, the single column building module is also used for:

[0038] Determine the device level corresponding to each device according to the connection sequence between each device in the single-column safety injection scheme;

[0039] The failure mode of each device is obtained, and the single-column fault tree is established based on the device level and the failure mode corresponding to each device.

[0040] Furthermore, the judgment module includes a probability calculation unit, and the probability calculation unit is used to:

[0041] Obtaining the failure probability corresponding to each failure mode in the single-column fault tree;

[0042] The failure probabilities are summed to obtain the first system failure probability.

[0043] Furthermore, the device also includes a restriction condition determination module, which is used to:

[0044] Determine the space constraints of the safety injection system based on the space volume of the containment in the floating reactor;

[0045] The volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipes are obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the space constraints.

[0046] Furthermore, the multi-column building module includes a scheme design unit, and the scheme design unit is used to:

[0047] Connecting a single water tank, an isolation valve, a pump and a check valve into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection scheme;

[0048] The water tank, the isolation valve, the pump and the check valve are divided into multiple sections based on the commonly connected pipelines, and the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme;

[0049] All devices except the water tank are connected in parallel according to the device level, and the parallel structures are connected in sequence through commonly connected pipes to obtain a third multi-column safety injection scheme.

[0050] Furthermore, the multi-column construction module further includes a fault tree construction unit, and the fault tree construction unit is used to:

[0051] Establishing a first multi-column fault tree including the same number of branch nodes as the number of the single column based on the first multi-column safety injection scheme;

[0052] Based on the number of nodes divided in the second plurality of columns of safety injection schemes, establishing a second plurality of columns of fault trees having the same number of branch nodes as the number of nodes;

[0053] Based on the highest equipment level in the third multi-column safety injection scheme, a third multi-column fault tree having the same number of branch nodes as that of the highest equipment level is established.

[0054] Furthermore, the second determining module is further used for:

[0055] Determine at least one failure probability of the system to be analyzed that meets the safety requirement from each of the second system failure probabilities;

[0056] The minimum value of the failure probability of the system to be analyzed is determined, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the safety injection system design scheme.

[0057] According to another aspect of the present invention, a storage medium is provided, wherein the storage medium stores at least one executable instruction, wherein the executable instruction enables a processor to execute operations corresponding to the above-mentioned method for designing a safe injection system.

[0058] According to another aspect of the present invention, there is provided a computer device, comprising a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0059] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute operations corresponding to the design method of the safe injection system as described above.

[0060] By means of the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

[0061] The present invention provides a design method and device, storage medium, and computer equipment for a safety injection system. Compared with the prior art, the present invention constructs a single-column safety injection scheme including a water tank, an isolation valve, a pump, and a check valve; and establishes a corresponding single-column fault tree based on the single-column safety injection scheme; determines a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judges whether the first system failure probability meets the safety requirements; if the first system failure probability meets the safety requirements, the single-column safety injection scheme is determined as a safety injection system design scheme; if the first system failure probability does not meet the safety requirements, then based on multiple connection methods of the water tank, the isolation valve, the pump, and the check valve, multiple-column safety injection schemes corresponding to various connection methods are constructed, and multiple-column fault trees corresponding to each of the multiple-column safety injection schemes are respectively established; the second system failure probability corresponding to each of the multiple-column safety injection schemes is determined based on the multiple-column fault trees; and the safety injection system design scheme is determined from each of the multiple-column safety injection schemes based on each of the second system failure probabilities. The present invention can consider the space constraints determined by the overall design requirements of the floating reactor and quickly propose a safety injection system design that meets the functional requirements and reliability requirements. It can also significantly improve the design efficiency of the floating reactor safety injection system design, optimize resource allocation, and provide strong support for optimizing the overall performance of the floating reactor safety system.

[0062] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0064] Figure 1 A schematic flow chart of a design method for a safe injection system provided by an embodiment of the present invention is shown;

[0065] Figure 2 A schematic structural diagram of a single-row safe injection solution provided by an embodiment of the present invention is shown;

[0066] Figure 3 A schematic diagram of a tree structure of a single-column fault tree provided by an embodiment of the present invention is shown;

[0067] Figure 4 A schematic structural diagram of a first multi-column safe injection solution provided by an embodiment of the present invention is shown;

[0068] Figure 5 A schematic structural diagram of a second multi-column safe injection solution provided by an embodiment of the present invention is shown;

[0069] Figure 6 A schematic structural diagram of a third multi-column safe injection solution provided by an embodiment of the present invention is shown;

[0070] Figure 7 A schematic diagram of a tree structure of a first multi-column fault tree provided by an embodiment of the present invention is shown;

[0071] Figure 8 A schematic diagram of a tree structure of a second multi-column fault tree provided by an embodiment of the present invention is shown;

[0072] Fig. 9 A tree structure diagram of a k-th column fault tree in an x-th device in a second multi-column fault tree provided by an embodiment of the present invention is shown;

[0073] Fig.10 A schematic diagram of a tree structure of a third multi-column fault tree provided by an embodiment of the present invention is shown;

[0074] Fig.11 A schematic diagram showing the structure of a design device for a safe injection system provided by an embodiment of the present invention is shown;

[0075] Fig.12 A schematic diagram of the structure of a computer device provided by an embodiment of the present invention is shown;

[0076] Among them, 1-water tank; 2-isolation valve; 3-pump; 4-check valve; 5-reactor pressure vessel. DETAILED DESCRIPTION

[0077] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0078] The embodiment of the present invention provides a design method of a safe injection system, such as Figure 1 As shown, the method includes:

[0079] 101. Construct a single-column safety injection scheme including a water tank, an isolation valve, a pump, and a check valve; and establish a corresponding single-column fault tree based on the single-column safety injection scheme;

[0080] In the embodiment of the present invention, the current execution end constructs a single-column safety injection solution including a water tank, an isolation valve, a pump and a check valve, such as Figure 2 As shown. Among them, water tank 1 is the water source of the safety injection system, which provides water for replenishing water to the reactor pressure vessel 5. Isolation valve 2 is a valve that isolates water tank 1 and reactor pressure vessel 5. This valve is normally closed during normal operation. Pump 3 is the power source of the safety injection system, providing the system with water injection pressure head. Check valve 4 is a device on the pipeline to prevent fluid backflow. Reactor pressure vessel 5 is the pressure vessel of a floating reactor. After the current execution end has built a single-column safety injection scheme, based on the above Figure 2 The single-column safety injection scheme shown in the figure establishes a corresponding single-column fault tree, such as Figure 3 shown.

[0081] 102. Determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and determine whether the first system failure probability meets safety requirements;

[0082] In the embodiment of the present invention, the current execution end is based on Figure 3 The single column fault tree shown determines the Figure 2 The first system failure probability corresponding to the single-column safety injection scheme shown. After obtaining the first system failure probability, the first system failure probability is compared with the preset safety probability target. When the first system failure probability is less than or equal to the preset safety probability target, it is considered that the first system failure probability meets the safety requirements; when the first system failure probability is greater than the preset safety probability target, it is considered that the first system failure probability does not meet the safety requirements. The preset safety probability target can be 1%, 1.2%, 1.5%, etc., which is not specifically limited in the embodiment of the present invention.

[0083] 103. If the failure probability of the first system meets the safety requirement, the single-column safety injection scheme is determined as the safety injection system design scheme;

[0084] In the embodiment of the present invention, when it is determined in step 102 that the first system failure probability meets the safety requirement, the current execution end accepts the system solution, that is, the single-column safety injection solution constructed in step 101 is determined as the safety injection system design solution.

[0085] 104. If the failure probability of the first system does not meet the safety requirement, construct multiple columns of safety injection schemes corresponding to various connection modes based on multiple connection modes of the water tank, the isolation valve, the pump and the check valve, and respectively establish multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes;

[0086] In the embodiment of the present invention, when it is determined in step 102 that the failure probability of the first system does not meet the safety requirements, the current execution end does not accept the single-column safety injection scheme, and needs to construct a multi-column safety injection scheme corresponding to various connection modes based on various connection modes of the water tank, isolation valve, pump and check valve. After the multi-column safety injection scheme is initially completed, the current execution end establishes corresponding multi-column fault trees according to the scheme, that is, establishes corresponding multi-column fault trees according to different pipeline connection modes, which is not specifically limited in the embodiment of the present invention.

[0087] 105. Determine the second system failure probability corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees respectively; and determine the safety injection system design scheme from each of the plurality of safety injection schemes based on each of the second system failure probabilities.

[0088] In the embodiment of the present invention, since the water tank, isolation valve, pump and check valve are connected through different pipeline connection methods, the corresponding second system failure probability under each connection method is different. The current execution end needs to determine the second system failure probability corresponding to each multi-column safety injection scheme based on the multi-column fault tree. After obtaining multiple second system failure probabilities, the optimal multi-column safety injection scheme, that is, the scheme with the smallest failure probability, is determined by comparison to obtain the target safety injection system design scheme.

[0089] Furthermore, as a refinement and extension of the specific implementation methods of the above-mentioned embodiments, in order to quickly determine the failure probability of the first system and improve the efficiency and stability of the scheme design, another design method for a safety injection system is provided, wherein the steps of establishing a corresponding single-column fault tree are based on the single-column safety injection scheme, including: determining the corresponding device level of each device according to the connection sequence between each device in the single-column safety injection scheme; obtaining the failure mode of each device, and establishing the single-column fault tree based on the corresponding device level and the failure mode of each device.

[0090] In the embodiment of the present invention, the current execution end follows Figure 2 The connection order between the various devices in the single-column safe injection scheme shown determines the device level corresponding to each device; for example, Figure 2 The equipment level of the water tank 1 is level 1, the equipment level of the isolation valve 2 is level 2, ..., the equipment level of the pump 3 is level i, ..., the equipment level of the check valve 4 is level n, etc., which are not specifically limited in the embodiment of the present invention. After determining the equipment level of each device, the current execution end obtains the failure mode of each device as the leaf node corresponding to each level of equipment, such as Figure 3 As shown in the figure, the failure modes corresponding to each level of equipment are different. The current execution end establishes the following based on the equipment level and failure mode corresponding to each device: Figure 3Single column fault tree shown.

[0091] The step of determining the first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree includes: obtaining the failure probability corresponding to each failure mode in the single-column fault tree; and summing each failure probability to obtain the first system failure probability.

[0092] In the embodiment of the present invention, the current execution end obtains Figure 3 The failure probability corresponding to each failure mode in the single-column fault tree shown, the specific failure probability can refer to the general data used in the probabilistic safety analysis of nuclear power plants, such as data from RUREG-CR6928 or the Advanced Light Water Reactor User Requirements Document (URD) ​​issued by the US Nuclear Regulatory Commission, etc., and the embodiment of the present invention does not make specific limitations. Then, the current execution end sums up each of the failure probabilities to obtain the first system failure probability, and the specific summation formula is as follows:

[0093]

[0094] Where Q1 is the failure probability of the first system; F ij is the failure probability of the jth failure mode of the i-th level equipment, 1≤i≤n, 1≤j≤m, n is the highest equipment level, and m is the number of failure modes.

[0095] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to design a safety injection system in a limited space, another design method of a safety injection system is provided. Before constructing a multi-column safety injection scheme corresponding to various connection modes based on various connection modes of a water tank, an isolation valve, a pump and a check valve, the method further includes:

[0096] Determine the space constraints of the safety injection system based on the space volume of the containment in the floating reactor;

[0097] The volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipes are obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the space constraints.

[0098] In an embodiment of the present invention, the current execution end obtains the spatial volume V1 of the containment in the floating reactor, and estimates the space V2 required for other system equipment in the containment, and determines that the space V3=V1-V2 that the containment can allocate to the safety injection system, that is, the spatial constraint condition of the safety injection system is that the volume is not greater than V3, which is not specifically limited in the embodiment of the present invention. After determining the spatial constraint condition V3 of the safety injection system, the current execution end obtains the volume of the water tank, the isolation valve, the pump, the check valve and the connecting pipe. The volume of the above equipment can be determined according to the current industrial level. Combined with the above-calculated spatial constraint condition V3, the number of safety injection columns that can be accommodated in the containment is determined, that is, the number of water tanks, isolation valves, pumps and check valves that can be accommodated in the containment. It should be noted that the number of water tanks, isolation valves, pumps and check valves contained in each column is consistent, which is not specifically limited in the embodiment of the present invention.

[0099] Further, as a refinement and extension of the specific implementation methods of the above embodiment, in order to enrich the design schemes of the safety injection system and facilitate the selection of a safer and more stable design scheme in the later stage, another design method of the safety injection system is provided, wherein the steps are based on multiple connection modes of the water tank, the isolation valve, the pump and the check valve to construct multiple columns of safety injection schemes corresponding to the various connection modes, including:

[0100] Connecting a single water tank, an isolation valve, a pump and a check valve into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection scheme;

[0101] In the embodiment of the present invention, the current execution end connects a single water tank, an isolation valve, a pump and a check valve into an independent single column, such as Figure 4 As shown, a single column only includes a set of water tanks 1, isolation valves 2, pumps 3 and check valves 4. The current execution end connects each single column in parallel to the reactor pressure vessel 5, and obtains the following Figure 4 The first multi-column safety injection scheme is shown. It should be noted that in the first multi-column safety injection scheme, the maximum number of single columns is determined by the number of safety injection columns that can be accommodated in the containment shell. For example, if the number of safety injection columns that can be accommodated in the containment shell is 4, then the maximum number of single columns is 4, etc., and the embodiment of the present invention does not make specific limitations.

[0102] The water tank, the isolation valve, the pump and the check valve are divided into multiple sections based on the commonly connected pipelines, and the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme;

[0103] In the embodiment of the present invention, the current execution end divides the equipment in the safety injection system such as water tanks, isolation valves, pumps and check valves into multiple sections based on the commonly connected pipes in each column, such as Figure 5 As shown, Figure 5The water tank 1 and the isolation valve 2 are the first section, and the pump 3 and the check valve 4 are the second section, which is not specifically limited in the embodiment of the present invention. Figure 5 As shown, the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme. It should be noted that in the second multi-column safety injection scheme, the maximum number of groups of water tanks, isolation valves, pumps and check valves is determined by the number of safety injection columns that can be accommodated in the containment. For example, if the number of safety injection columns that can be accommodated in the containment is 3, then the maximum number of groups of water tanks, isolation valves, pumps and check valves is 3, etc., which is not specifically limited in the embodiment of the present invention.

[0104] All devices except the water tank are connected in parallel according to the device level, and the parallel structures are connected in sequence through commonly connected pipes to obtain a third multi-column safety injection scheme.

[0105] In the embodiment of the present invention, the current execution end connects all devices except water tank 1 in parallel according to the device level, such as Figure 6 As shown, Figure 6 The isolation valves 2 of the second-level equipment are connected in parallel with each other, the pumps 3 of the i-th-level equipment are connected in parallel with each other, the check valves 4 of the n-th-level equipment are connected in parallel with each other, etc., which are not specifically limited in the embodiment of the present invention. After the equipment of the same level is connected in parallel, the parallel structures are connected in sequence through a commonly connected pipeline to obtain a third multi-column safety injection scheme. It should be noted that in the third multi-column safety injection scheme, the maximum number of groups of water tanks, isolation valves, pumps and check valves is determined by the number of safety injection columns that can be accommodated in the containment shell. For example, if the number of safety injection columns that can be accommodated in the containment shell is 5, then the maximum number of groups of water tanks, isolation valves, pumps and check valves is 5, etc., which are not specifically limited in the embodiment of the present invention.

[0106] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to quickly determine the failure probability of the second system and improve the efficiency and stability of the scheme design, another design method of a safety injection system is provided, wherein the steps of respectively establishing a multi-column fault tree corresponding to each of the multi-column safety injection schemes include:

[0107] Establishing a first multi-column fault tree including the same number of branch nodes as the number of the single column based on the first multi-column safety injection scheme;

[0108] In the embodiment of the present invention, the current execution end establishes a first multi-column fault tree including the same number of branch nodes as the number of a single column based on the first multi-column safety injection scheme, such as Figure 7 As shown, Figure 7 contains l number of branch nodes, the number of which is the same as Figure 4 The number of single columns in the embodiment of the present invention is not specifically limited. It should be noted that: Figure 7 The branch nodes from the first single-column fault tree to the lth single-column fault tree are Figure 3 The single-column fault tree structure is consistent with that in the embodiment of the present invention, and will not be described in detail. Figure 7 Construct the first multi-column fault tree and calculate the second system failure probability Q corresponding to the first multi-column safety injection scheme 21 , as shown in the following formula:

[0109]

[0110] Among them, F ijk It represents the failure probability of the i-th failure mode of the j-th level equipment in the k-th column, 1≤i≤n, 1≤j≤m, 2≤k≤l, where l is determined by the number of safety injection columns that can be accommodated in the containment.

[0111] Based on the number of nodes divided in the second plurality of columns of safety injection schemes, establishing a second plurality of columns of fault trees having the same number of branch nodes as the number of nodes;

[0112] In the embodiment of the present invention, the current execution end establishes a second multi-column fault tree having the same number of branch nodes as the number of nodes based on the number of nodes divided in the second multi-column safety injection scheme, such as Figure 8 As shown, Figure 8 is divided into section 1 to section x, then the second multi-column fault tree contains x branch nodes. Figure 8 The tree structure of the fault tree in column k corresponding to the device in section x is as follows Fig. 9 The current execution end is based on the above Figure 8 and Fig. 9 The second multi-column fault tree constructed is used to calculate the second system failure probability Q corresponding to the second multi-column safety injection scheme. 22 , as shown in the following formula:

[0113]

[0114] Among them, F ijkx It represents the failure probability of the i-th failure mode of the j-th level device in the k-th column of the x-th section, 2≤x≤d, 1≤j≤m, 2≤k≤l, o≤i≤p, where o and p are the ranges of the device levels in the x-th section, respectively.

[0115] Based on the highest equipment level in the third multi-column safety injection scheme, a third multi-column fault tree having the same number of branch nodes as that of the highest equipment level is established.

[0116] In the embodiment of the present invention, the current execution end establishes a third multi-column fault tree having the same number of branch nodes as the highest device level in the third multi-column safety injection scheme, such as Fig.10 As shown, Fig.10 The fault tree of each branch node in Figure 3The single-column fault tree structure is consistent with that of the third multi-column safety injection scheme, so the third system failure probability Q corresponding to the third multi-column safety injection scheme is calculated. 23 , as shown in the following formula:

[0117]

[0118] Among them, F ijk It represents the failure probability of the i-th failure mode of the j-th level device in the k-th column, 1≤i≤n, 1≤j≤m, 2≤k≤l.

[0119] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to determine a relatively optimal design scheme from a plurality of design schemes of a safety injection system, another design method of a safety injection system is provided, wherein the steps of determining the design scheme of the safety injection system from each plurality of columns of safety injection schemes based on each second system failure probability include:

[0120] Determine at least one failure probability of the system to be analyzed that meets the safety requirement from each of the second system failure probabilities;

[0121] The minimum value of the failure probability of the system to be analyzed is determined, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the safety injection system design scheme.

[0122] In the embodiment of the present invention, the current execution end compares the calculated failure probabilities of each second system with the preset safety probability target, determines the failure probability of the second system that is less than or equal to the preset safety probability target as the failure probability of the system to be analyzed, and then determines at least one failure probability of the system to be analyzed that meets the safety requirements from the failure probabilities of each second system. Next, the values ​​of the failure probabilities of each system to be analyzed are compared to determine the minimum value, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the relatively optimal scheme, that is, the target safety injection system design scheme, and the system design scheme is finally solidified in combination with the containment layout of the floating reactor.

[0123] The embodiment of the present invention provides a design method for a safety injection system. Compared with the prior art, the present invention constructs a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and establishes a corresponding single-column fault tree based on the single-column safety injection scheme; determines the first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judges whether the first system failure probability meets the safety requirements; if the first system failure probability meets the safety requirements, the single-column safety injection scheme is determined as the safety injection system design scheme; if the first system failure probability does not meet the safety requirements, then a multi-column safety injection scheme corresponding to various connection modes is constructed based on various connection modes of the water tank, the isolation valve, the pump and the check valve, and a multi-column fault tree corresponding to each of the multi-column safety injection schemes is established respectively; the second system failure probability corresponding to each of the multi-column safety injection schemes is determined based on the multi-column fault tree; and the safety injection system design scheme is determined from each of the multi-column safety injection schemes based on each of the second system failure probabilities. The present invention can consider the space constraints determined by the overall design requirements of the floating reactor and quickly propose a safety injection system design scheme that meets the functional requirements and reliability requirements. It also significantly improves the design efficiency of the floating reactor safety injection system design, optimizes resource allocation, and provides strong support for optimizing the overall performance of the floating reactor safety system.

[0124] As the above Figure 1 The embodiment of the present invention provides a design device for a safe injection system, such as Fig.11 As shown, the device comprises:

[0125] A single-column construction module 21 is used to construct a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and to establish a corresponding single-column fault tree based on the single-column safety injection scheme;

[0126] A judgment module 22 is used to determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and to judge whether the first system failure probability meets the safety requirements;

[0127] A first determination module 23, configured to determine the single-column safety injection scheme as a safety injection system design scheme if the first system failure probability meets the safety requirement;

[0128] A multi-column construction module 24, configured to construct a multi-column safety injection scheme corresponding to each connection mode based on various connection modes of the water tank, the isolation valve, the pump and the check valve if the failure probability of the first system does not meet the safety requirement, and respectively establish a multi-column fault tree corresponding to each of the multi-column safety injection schemes;

[0129] The second determination module 25 is used to determine the second system failure probability corresponding to each of the multiple columns of safety injection solutions based on the multiple columns of fault trees respectively; and determine the safety injection system design solution from each of the multiple columns of safety injection solutions based on each of the second system failure probabilities.

[0130] Furthermore, the single-column building module 21 is also used for:

[0131] Determine the device level corresponding to each device according to the connection sequence between each device in the single-column safety injection scheme;

[0132] The failure mode of each device is obtained, and the single-column fault tree is established based on the device level and the failure mode corresponding to each device.

[0133] Furthermore, the judgment module 22 includes a probability calculation unit, and the probability calculation unit is used to:

[0134] Obtaining the failure probability corresponding to each failure mode in the single-column fault tree;

[0135] The failure probabilities are summed to obtain the first system failure probability.

[0136] Furthermore, the device also includes a restriction condition determination module, which is used to:

[0137] Determine the space constraints of the safety injection system based on the space volume of the containment in the floating reactor;

[0138] The volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipes are obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the space constraints.

[0139] Furthermore, the multi-column building module 24 includes a scheme design unit, and the scheme design unit is used to:

[0140] Connecting a single water tank, an isolation valve, a pump and a check valve into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection scheme;

[0141] The water tank, the isolation valve, the pump and the check valve are divided into multiple sections based on the commonly connected pipelines, and the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme;

[0142] All devices except the water tank are connected in parallel according to the device level, and the parallel structures are connected in sequence through commonly connected pipes to obtain a third multi-column safety injection scheme.

[0143] Furthermore, the multi-column construction module 24 further includes a fault tree construction unit, and the fault tree construction unit is used to:

[0144] Establishing a first multi-column fault tree including the same number of branch nodes as the number of the single column based on the first multi-column safety injection scheme;

[0145] Based on the number of nodes divided in the second plurality of columns of safety injection schemes, establishing a second plurality of columns of fault trees having the same number of branch nodes as the number of nodes;

[0146] Based on the highest equipment level in the third multi-column safety injection scheme, a third multi-column fault tree having the same number of branch nodes as that of the highest equipment level is established.

[0147] Furthermore, the second determining module 25 is further configured to:

[0148] Determine at least one failure probability of the system to be analyzed that meets the safety requirement from each of the second system failure probabilities;

[0149] The minimum value of the failure probability of the system to be analyzed is determined, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the safety injection system design scheme.

[0150] The embodiment of the present invention provides a design device for a safety injection system. Compared with the prior art, the present invention constructs a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and establishes a corresponding single-column fault tree based on the single-column safety injection scheme; determines the first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judges whether the first system failure probability meets the safety requirements; if the first system failure probability meets the safety requirements, the single-column safety injection scheme is determined as the safety injection system design scheme; if the first system failure probability does not meet the safety requirements, then a multi-column safety injection scheme corresponding to various connection modes is constructed based on various connection modes of the water tank, the isolation valve, the pump and the check valve, and a multi-column fault tree corresponding to each of the multi-column safety injection schemes is established respectively; the second system failure probability corresponding to each of the multi-column safety injection schemes is determined based on the multi-column fault tree; and the safety injection system design scheme is determined from each of the multi-column safety injection schemes based on each of the second system failure probabilities. The present invention can consider the space constraints determined by the overall design requirements of the floating reactor and quickly propose a safety injection system design scheme that meets the functional requirements and reliability requirements. It also significantly improves the design efficiency of the floating reactor safety injection system design, optimizes resource allocation, and provides strong support for optimizing the overall performance of the floating reactor safety system.

[0151] According to one embodiment of the present invention, a storage medium is provided, wherein the storage medium stores at least one executable instruction, and the computer executable instruction can execute the design method of the safe injection system in any of the above method embodiments.

[0152] Fig.12 A schematic diagram of the structure of a computer device provided according to an embodiment of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the computer device.

[0153] like Fig.12 As shown, the computer device may include: a processor (processor) 302 , a communication interface (Communications Interface) 304 , a memory (memory) 306 , and a communication bus 308 .

[0154] The processor 302 , the communication interface 304 , and the memory 306 communicate with each other via the communication bus 308 .

[0155] The communication interface 304 is used to communicate with other devices such as clients or other servers.

[0156] The processor 302 is used to execute the program 310, and specifically can execute the relevant steps of the above-mentioned design method of the safe injection system.

[0157] Specifically, the program 310 may include program codes, which include computer operation instructions.

[0158] The processor 302 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention. The one or more processors included in the computer device may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0159] The memory 306 is used to store the program 310. The memory 306 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0160] The program 310 may be specifically configured to enable the processor 302 to perform the following operations:

[0161] Constructing a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve; and establishing a corresponding single-column fault tree based on the single-column safety injection scheme;

[0162] Determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judge whether the first system failure probability meets the safety requirements;

[0163] If the failure probability of the first system meets the safety requirement, determining the single-column safety injection scheme as the safety injection system design scheme;

[0164] If the failure probability of the first system does not meet the safety requirement, construct multiple columns of safety injection schemes corresponding to various connection modes based on various connection modes of the water tank, the isolation valve, the pump and the check valve, and respectively establish multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes;

[0165] The second system failure probabilities corresponding to the plurality of safety injection schemes are determined based on the plurality of fault trees respectively; and the safety injection system design scheme is determined from the plurality of safety injection schemes based on the second system failure probabilities.

[0166] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0167] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A design method for a safe injection system, characterized in that: include: Construct a single-column safety injection solution that includes a water tank, isolation valve, pump, and check valve; and establishing a corresponding single-column fault tree based on the single-column safety injection scheme; Determining a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and determining whether the failure probability of the first system meets safety requirements; If the failure probability of the first system meets the safety requirement, determining the single-column safety injection scheme as the safety injection system design scheme; If the failure probability of the first system does not meet the safety requirement, construct multiple columns of safety injection schemes corresponding to various connection modes based on various connection modes of the water tank, the isolation valve, the pump and the check valve, and respectively establish multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes; Determining second system failure probabilities corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees respectively; The safety injection system design scheme is determined from each of the multiple columns of safety injection schemes based on each of the second system failure probabilities.

2. The method according to claim 1, characterized in that The establishing of a corresponding single-column fault tree based on the single-column safety injection scheme includes: Determine the device level corresponding to each device according to the connection sequence between each device in the single-column safety injection scheme; The failure mode of each device is obtained, and the single-column fault tree is established based on the device level and the failure mode corresponding to each device.

3. The method according to claim 1, characterized in that The determining, based on the single-column fault tree, a first system failure probability corresponding to the single-column safety injection scheme comprises: Obtaining the failure probability corresponding to each failure mode in the single-column fault tree; The failure probabilities are summed to obtain the first system failure probability.

4. The method according to claim 1, characterized in that Before constructing a multi-column safety injection scheme corresponding to various connection modes based on various connection modes of the water tank, the isolation valve, the pump and the check valve, the method further includes: Determine the space constraints of the safety injection system based on the space volume of the containment in the floating reactor; The volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipes are obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the space constraints.

5. The method according to claim 1, characterized in that The multiple connection modes of the water tank, the isolation valve, the pump and the check valve are used to construct a multi-column safety injection scheme corresponding to the various connection modes, including: Connecting a single water tank, an isolation valve, a pump and a check valve into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection scheme; The water tank, the isolation valve, the pump and the check valve are divided into multiple sections based on the commonly connected pipelines, and the devices in each section are connected in sequence and then connected in parallel to obtain a second multi-column safety injection scheme; All devices except the water tank are connected in parallel according to the device level, and the parallel structures are connected in sequence through commonly connected pipes to obtain a third multi-column safety injection scheme.

6. The method according to claim 5, characterized in that The step of respectively establishing multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes comprises: Establishing a first multi-column fault tree including the same number of branch nodes as the number of the single column based on the first multi-column safety injection scheme; Based on the number of nodes divided in the second plurality of columns of safety injection schemes, establishing a second plurality of columns of fault trees having the same number of branch nodes as the number of nodes; Based on the highest equipment level in the third multi-column safety injection scheme, a third multi-column fault tree having the same number of branch nodes as that of the highest equipment level is established.

7. The method according to any one of claims 1 to 6, characterized in that: The step of determining the safety injection system design scheme from each of the plurality of safety injection schemes based on each of the second system failure probabilities comprises: Determine at least one failure probability of the system to be analyzed that meets the safety requirement from each of the second system failure probabilities; The minimum value of the failure probability of the system to be analyzed is determined, and the multiple columns of safety injection schemes corresponding to the minimum value are determined as the safety injection system design scheme.

8. A design device for a safe injection system, characterized in that: include: Single-column building blocks for building a single-column safety injection solution including a water tank, isolation valve, pump and check valve; and establishing a corresponding single-column fault tree based on the single-column safety injection scheme; A judgment module, configured to determine a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and determining whether the failure probability of the first system meets safety requirements; A first determination module, configured to determine the single-column safety injection scheme as a safety injection system design scheme if the failure probability of the first system meets the safety requirement; a multi-column construction module, configured to construct a multi-column safety injection scheme corresponding to various connection modes of the water tank, the isolation valve, the pump and the check valve if the failure probability of the first system does not meet the safety requirement, and respectively establish a multi-column fault tree corresponding to each of the multi-column safety injection schemes; A second determination module, configured to determine a second system failure probability corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees respectively; The safety injection system design scheme is determined from each of the multiple columns of safety injection schemes based on each of the second system failure probabilities.

9. A storage medium, wherein at least one executable instruction is stored in the storage medium, and the executable instruction executes an operation corresponding to the design method of a safe injection system according to any one of claims 1 to 7.

10. A computer device, comprising a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute an operation corresponding to the design method of a safe injection system according to any one of claims 1-7.

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