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

Abstract

The application discloses a design method and device of a safe injection system, a storage medium and computer equipment, and mainly solves the problem of how to design a safe injection system meeting the safety target of a floating reactor in limited space, and comprises the following steps: constructing a single-column safe injection scheme comprising a water tank, an isolation valve, a pump and a check valve, and establishing a corresponding single-column fault tree; determining a first system failure probability corresponding to the single-column safe injection scheme based on the single-column fault tree; judging whether the first system failure probability meets safety requirements; if yes, determining the single-column safe injection scheme as a safe injection system design scheme; if not, constructing multiple-column safe injection schemes based on multiple connection modes, and respectively establishing multiple-column fault trees corresponding to each multiple-column safe injection scheme; determining a second system failure probability based on the multiple-column fault trees; and determining a safe injection system design scheme from each multiple-column safe injection scheme based on the second system failure probability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power safety, in particular to a design method and device of a safety injection system, a storage medium and a computer device. BACKGROUND

[0002] Maintaining the reactor coolant system water inventory is one of the basic safety functions of floating reactors. When a break occurs in the reactor coolant system or the pipe connected to the reactor coolant system and separated by the unused isolation valve, the coolant of the reactor coolant system will be lost quickly. With the decrease of the reactor coolant system water inventory, the reactor core may be exposed, and the fuel elements of the exposed core may be heated up quickly. If the fuel elements are not cooled in time, the fuel elements may face the risk of burning out, and the accident consequences will be further deteriorated.

[0003] The main system to deal with the reactor coolant system loss of coolant accident is the safety injection system. The safety injection system can provide makeup water for the reactor coolant system in the case of loss of coolant, and sufficient flow of makeup water can quickly flood the exposed core to cool the fuel elements and terminate the accident process. At present, the design method of the safety injection system of the land-based nuclear power plant is relatively mature. However, when designing the safety injection system of the 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 the land-based nuclear power plant cannot be completely used for reference. Therefore, it is urgent to design a safety injection system that meets the safety target of the floating reactor in the limited space and load. SUMMARY

[0004] Therefore, the present application provides a design method and device of a safety injection system, a storage medium and a computer device, which mainly aims to solve the problem of how to design a safety injection system that meets the safety target of the floating reactor in the limited space.

[0005] According to an aspect of the present application, a design method of a safety injection system is provided, which comprises:

[0006] constructing a single-column safety injection scheme comprising 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] determining a first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree; and judging whether the first system failure probability meets a safety requirement;

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

[0009] if the first system failure probability does not meet the safety requirement, a plurality of connection modes of a water tank, an isolation valve, a pump and a check valve are used to construct a plurality of safety injection schemes corresponding to various connection modes, and a plurality of fault trees corresponding to each of the plurality of safety injection schemes are established respectively;

[0010] Second system failure probabilities corresponding to each of 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 each of the plurality of safety injection schemes based on each of the second system failure probabilities.

[0011] Further, the establishment of the corresponding single fault tree based on the single safety injection scheme comprises:

[0012] The device level corresponding to each device is determined according to the connection order between each device in the single safety injection scheme;

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

[0014] Further, the determination of the first system failure probability corresponding to the single safety injection scheme based on the single fault tree comprises:

[0015] The failure probability corresponding to each of the failure modes in the single fault tree is obtained;

[0016] Each of the failure probabilities is summed to obtain the first system failure probability.

[0017] Further, before the plurality of connection modes of the water tank, the isolation valve, the pump and the check valve are used to construct the plurality of safety injection schemes corresponding to various connection modes, the method further comprises:

[0018] The spatial constraint condition of the safety injection system is determined based on the spatial volume of the containment of the floating reactor;

[0019] The volume of the water tank, the isolation valve, the pump, the check valve and the connecting pipeline is obtained, and the number of safety injection columns that can be accommodated in the containment is determined in combination with the spatial constraint condition.

[0020] Further, the plurality of connection modes of the water tank, the isolation valve, the pump and the check valve are used to construct the plurality of safety injection schemes corresponding to various connection modes, comprising:

[0021] A single water tank, an isolation valve, a pump and a check valve are connected as an independent single column, and each single column is connected in parallel to access the reactor pressure vessel to obtain a first plurality of safety injection schemes;

[0022] The water tank, the isolation valve, the pump and the check valve are divided into multiple sections by a pipeline based on common connection, the devices in each section are connected in sequence and then are connected in parallel with each other, and a second multi-column safe injection scheme is obtained;

[0023] All the devices except the water tank are connected in parallel according to the device level, and the parallel connection structure is connected in sequence by a pipeline based on common connection, and a third multi-column safe injection scheme is obtained.

[0024] Further, the multiple fault trees corresponding to the multiple safe injection schemes are respectively established, and the establishment includes:

[0025] A first multi-column fault tree containing the same number of branch nodes as the number of single columns is established based on the first multi-column safe injection scheme;

[0026] A second multi-column fault tree containing the same number of branch nodes as the number of nodes is established based on the number of nodes divided in the second multi-column safe injection scheme;

[0027] A third multi-column fault tree containing the same number of branch nodes as the highest device level is established based on the highest device level in the third multi-column safe injection scheme.

[0028] Further, the safe injection system design scheme is determined from the multiple safe injection schemes based on the second system failure probability, and the determination includes:

[0029] At least one to-be-analyzed system failure probability meeting the safety requirement is determined from the second system failure probability;

[0030] The minimum value of the to-be-analyzed system failure probability is determined, and the multi-column safe injection scheme corresponding to the minimum value is determined as the safe injection system design scheme.

[0031] According to another aspect of the present application, a design device of a safe injection system is provided, and the device includes:

[0032] A single-column construction module is configured to construct a single-column safe injection scheme containing 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 safe injection scheme;

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

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

[0035] a plurality of column construction modules, configured to, if the first system failure probability does not satisfy the safety requirement, construct a plurality of column safety injection schemes corresponding to a plurality of connection modes of the water tank, the isolation valve, the pump and the check valve based on the plurality of connection modes, and establish a plurality of fault trees corresponding to each of the plurality of column safety injection schemes respectively;

[0036] a second determination module, configured to determine a second system failure probability corresponding to each of the plurality of column 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 column safety injection schemes based on each of the second system failure probabilities.

[0037] Further, the single-column construction module is further configured to:

[0038] determine a device level corresponding to each device according to a connection order between the devices in the single-column safety injection scheme;

[0039] obtain a failure mode of each device, and establish the single-column fault tree based on the device level corresponding to each device and the failure mode.

[0040] Further, the judging module comprises a probability calculation unit, which is configured to:

[0041] obtain a failure probability corresponding to each of the failure modes in the single-column fault tree;

[0042] sum up each of the failure probabilities to obtain the first system failure probability.

[0043] Further, the apparatus further comprises a limitation condition determination module, which is configured to:

[0044] determine a space constraint condition of the safety injection system based on a space volume of a containment vessel in the floating type reactor;

[0045] obtain volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipeline, and determine a number of safety injection columns that can be accommodated in the containment vessel in combination with the space constraint condition.

[0046] Further, the plurality of column construction modules comprise a scheme design unit, which is configured to:

[0047] connect a single water tank, a single isolation valve, a single pump and a single check valve into an independent single column, and connect each single column in parallel to access the reactor pressure vessel to obtain a first plurality of column safety injection schemes;

[0048] divide the water tank, the isolation valve, the pump and the check valve into a plurality of sections based on a commonly connected pipeline, and connect the devices in each section in sequence and then in parallel to each other to obtain a second plurality of column safety injection schemes;

[0049] Parallel all the devices except the water tank according to the device level, and connect the parallel structures in turn through the common connecting pipeline to obtain a third multi-column safe injection scheme.

[0050] Further, the multi-column construction module further comprises a fault tree construction unit, which is configured to:

[0051] establish a first multi-column fault tree comprising the same number of branch nodes as the number of single columns based on the first multi-column safe injection scheme;

[0052] establish a second multi-column fault tree comprising the same number of branch nodes as the number of nodes divided in the second multi-column safe injection scheme;

[0053] establish a third multi-column fault tree comprising the same number of branch nodes as the highest device level in the third multi-column safe injection scheme.

[0054] Further, the second determination module is further configured to:

[0055] determine at least one to-be-analyzed system failure probability meeting the safety requirement from each of the second system failure probabilities;

[0056] determine the minimum value of the to-be-analyzed system failure probability, and determine the multi-column safe injection scheme corresponding to the minimum value as the safe injection system design scheme.

[0057] According to another aspect of the present application, a storage medium is provided, and the storage medium stores at least one executable instruction, and the executable instruction causes a processor to perform operations corresponding to the above-mentioned design method of the safe injection system.

[0058] According to another aspect of the present application, a computer device is provided, which comprises a processor, a memory, a communication interface and a communication bus, and the processor, the memory and the communication interface complete communication with each other through the communication bus.

[0059] The memory is configured to store at least one executable instruction, and the executable instruction causes the processor to perform operations corresponding to the above-mentioned design method of the safe injection system.

[0060] By means of the above technical solutions, the technical solutions provided by the embodiments of the present application have at least the following advantages:

[0061] The application provides a design method and device of a safe injection system, a storage medium and a computer device.

[0062] The above description is only a summary of the technical scheme of the application. In order to make the technical means of the application more clearly understood, the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0063] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiments. The drawings are for purposes of illustration only and are not considered a limitation thereof. Moreover, the same reference numbers in different drawings refer to the same or similar components. In the drawings:

[0064] Figure 1 A flowchart of a design method of a safe injection system is shown;

[0065] Figure 2 A structure diagram of a single-column safe injection scheme is shown;

[0066] Figure 3 A tree structure diagram of a single-column fault tree is shown;

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

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

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

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

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

[0072] Figure 9 A tree structure schematic diagram of a kth column fault tree in an xth section device in a second multi-column fault tree provided by an embodiment of the present application is shown;

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

[0074] Figure 11 A structural schematic diagram of a design device of a safe injection system provided by an embodiment of the present application is shown;

[0075] Figure 12 A structural schematic diagram of a computer device provided by an embodiment of the present application is shown;

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

[0077] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the 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. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0078] An embodiment of the present application provides a design method of a safe injection system, as shown in the figure, the method comprises: Figure 1

[0079] 101, a single-column safe injection scheme containing a water tank, an isolation valve, a pump and a check valve is constructed; and a corresponding single-column fault tree is established based on the single-column safe injection scheme;​

[0080] In the embodiment of the present application, the current execution end constructs a single-column safety injection scheme including a water tank, an isolation valve, a pump and a check valve, as shown in the figure. Figure 2 Among them, the water tank 1 is the water source of the safety injection system, providing water source for water supplement to the reactor pressure vessel 5. The isolation valve 2 is the valve for isolating the water tank 1 and the reactor pressure vessel 5, which is normally closed in normal operation. The pump 3 is the power source of the safety injection system, providing water injection pressure head for the system. The check valve 4 is a device for preventing fluid backflow in the pipeline. The reactor pressure vessel 5 is the pressure vessel of the floating reactor. After the current execution end constructs the single-column safety injection scheme, it establishes a corresponding single-column fault tree based on the single-column safety injection scheme, as shown in the figure. Figure 2 Figure 3

[0081] 102. Determine the 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 the safety requirement;

[0082] In the embodiment of the present application, the current execution end determines the first system failure probability corresponding to the single-column safety injection scheme based on the single-column fault tree, as shown in the figure. Figure 3 Figure 2 After obtaining the first system failure probability, the current execution end compares the first system failure probability with a 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 requirement; 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 requirement. The preset safety probability target can be 1%, 1.2%, 1.5%, etc., which is not limited in the embodiment of the present application.

[0083] 103. If the first system failure probability 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 application, when it is determined by step 102 that the first system failure probability meets the safety requirement, the current execution end accepts the system scheme, i.e. the single-column safety injection scheme constructed by step 101 is determined as the safety injection system design scheme.

[0085] 104. If the first system failure probability does not meet the safety requirement, a plurality of safety injection schemes corresponding to a plurality of connection modes of the water tank, the isolation valve, the pump and the check valve are constructed based on the connection modes, and a plurality of fault trees corresponding to the plurality of safety injection schemes are respectively established.

[0086] ​​​When it is determined by step 102 that the first system failure probability does not satisfy the safety requirement, 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 of the water tank, the isolation valve, the pump and the check valve. After the multi-column safety injection scheme is preliminarily completed, the current execution end establishes a corresponding multi-column fault tree according to the scheme, that is, a corresponding multi-column fault tree is established according to different pipeline connection modes, and the embodiment of the present application is not limited in this regard.

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

[0088] In the embodiment of the present application, since the water tank, the isolation valve, the pump and the check valve are connected through different pipeline connection modes, the corresponding second system failure probability under each connection mode is different, and the current execution end needs to determine the second system failure probability corresponding to each of the multi-column safety injection schemes based on the multi-column fault trees. After obtaining a plurality of second system failure probabilities, the optimal multi-column safety injection scheme is determined by comparison, that is, the scheme with the smallest failure probability, and the target safety injection system design scheme is obtained.

[0089] Further, as a refinement and expansion of the above embodiment, in order to quickly determine the first system failure probability and improve the efficiency and stability of the scheme design, another safety injection system design method is provided. The steps of establishing a corresponding single-column fault tree based on the single-column safety injection scheme include: determining the device level corresponding to each device according to the connection order 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 device level corresponding to each device and the failure mode.

[0090] In the embodiment of the present application, the current execution end determines the device level corresponding to each device according to the connection order between each device in the single-column safety injection scheme. Figure 2 For example, the device level of the water tank 1 in FIG. 1 is the first level, the device level of the isolation valve 2 is the second level, the device level of the pump 3 is the i-th level, and the device level of the check valve 4 is the n-th level. Figure 2 Figure 3 For example, the failure mode of the water tank 1 in FIG. 1 is the first level, the failure mode of the isolation valve 2 is the second level, the failure mode of the pump 3 is the i-th level, and the failure mode of the check valve 4 is the n-th level. Figure 3 ​The single-column fault tree is 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 comprises: 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 application, the current execution end obtains Figure 3 The failure probability corresponding to each failure mode in the single-column fault tree can refer to general data used in probabilistic safety analysis of nuclear power plants, such as data from RUREG-CR6928 or the Advanced Light Water Reactor User Requirements Document (URD) published by the U.S. Nuclear Regulatory Commission, and the embodiment of the present application is not limited in this regard. Then, the current execution end sums each failure probability to obtain the first system failure probability, and the specific summation formula is as follows:

[0093]

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

[0095] Further, as a refinement and expansion of the above embodiment, in order to design a safety injection system in a limited space, another safety injection system design method is provided, and before the step of constructing multiple safety injection schemes corresponding to various connection modes based on multiple connection modes of water tanks, isolation valves, pumps and check valves, the method further comprises:

[0096] Determining the spatial constraint condition of the safety injection system based on the spatial volume of the containment in the floating reactor;

[0097] Obtaining the volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipeline, and determining the number of safety injection columns that can be accommodated in the containment in combination with the spatial constraint condition.

[0098] In the embodiment of the present application, the current execution end obtains the space volume V1 of the containment of the floating reactor, estimates the space V2 required by other system devices in the containment, determines the space V3 = V1-V2 that can be allocated to the safety injection system by the containment, that is, the space constraint condition of the safety injection system is that the volume is not greater than V3, and the embodiment of the present application is not limited specifically. After determining the space constraint condition V3 of the safety injection system, the current execution end obtains the volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipeline. The volumes of the above-mentioned devices can be determined according to the current industrial level. The number of safety injection columns that can be accommodated in the containment is determined in combination with the calculated space constraint condition V3, 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, and the embodiment of the present application is not limited specifically.

[0099] Further, as a refinement and expansion of the specific implementation manner of the above-mentioned embodiment, in order to make the design scheme of the safety injection system more abundant and facilitate the selection of a more safe and stable design scheme in the later stage, another design method of the safety injection system is provided, and the steps are to construct a plurality of safety injection schemes corresponding to various connection modes based on a plurality of connection modes of the water tank, the isolation valve, the pump and the check valve, comprising:

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

[0101] In the embodiment of the present application, the current execution end connects a single water tank, an isolation valve, a pump and a check valve into an independent single column, as shown in FIG. 1, wherein the single column only contains a group of water tank 1, isolation valve 2, pump 3 and check valve 4. Figure 4 The current execution end connects each single column in parallel to access the reactor pressure vessel 5 to obtain the first multi-column safety injection scheme as shown in FIG. 2. Figure 4 It should be noted that in the first multi-column safety injection scheme, the maximum value of the number of single columns is determined by the number of safety injection columns that can be accommodated in the containment, such as the number of safety injection columns that can be accommodated in the containment is 4, and the maximum value of the number of single columns is 4, and the embodiment of the present application is not limited specifically.

[0102] dividing the water tank, the isolation valve, the pump and the check valve into a plurality of sections based on the common connecting pipeline, and connecting the devices in each section in turn and then connecting them in parallel to obtain a second multi-column safety injection scheme;

[0103] In the embodiment of the present application, the current execution end divides the devices in the safety injection system such as the water tank, the isolation valve, the pump and the check valve into a plurality of sections based on the common connecting pipeline in each column, as shown in FIG. 3. Figure 5 Figure 5 ​The middle water tank 1 and the isolation valve 2 are a first section, the pump 3 and the check valve 4 are a second section, and the embodiments of the present application are not limited specifically. Figure 5 As shown in the figure, the devices in each section are connected in turn and then are connected in parallel with each other, to obtain a second multi-column safety injection scheme. It should be noted that in the second multi-column safety injection scheme, the maximum value of the group number of the water tank, the isolation valve, the pump and the check valve is determined by the number of safety injection columns that can be accommodated in the safety shell, for example, if the number of safety injection columns that can be accommodated in the safety shell is 3, then the maximum value of the group number of the water tank, the isolation valve, the pump and the check valve is 3, and the like, and the embodiments of the present application are not limited specifically.

[0104] All the devices except the water tank are connected in parallel according to the device level, and the parallel structure is connected in turn through a common pipeline, to obtain a third multi-column safety injection scheme.

[0105] In the embodiments of the present application, all the devices except the water tank 1 are connected in parallel according to the device level, as shown in the figure, Figure 6 Figure 6 the second-level device isolation valve 2 is connected in parallel with each other, the i-level device pump 3 is connected in parallel with each other, the n-level device check valve 4 is connected in parallel with each other, and the like, and the embodiments of the present application are not limited specifically. After the devices of the same level are connected in parallel, the parallel structure is connected in turn through a common 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 value of the group number of the water tank, the isolation valve, the pump and the check valve is determined by the number of safety injection columns that can be accommodated in the safety shell, for example, if the number of safety injection columns that can be accommodated in the safety shell is 5, then the maximum value of the group number of the water tank, the isolation valve, the pump and the check valve is 5, and the like, and the embodiments of the present application are not limited specifically.

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

[0107] A first multi-column fault tree containing the same number of branch nodes as the number of single columns is established based on the first multi-column safety injection scheme;

[0108] In the embodiments of the present application, a first multi-column fault tree containing the same number of branch nodes as the number of single columns is established based on the first multi-column safety injection scheme, as shown in the figure, Figure 7 Figure 7 containing l branch nodes, and the number of branch nodes is the same as the number of single columns in Figure 4 the present application is not limited specifically. It should be noted that Figure 7 the branch nodes in the first single-column fault tree to the lth single-column fault tree are the same as the branch nodes in the first multi-column fault tree to the lth multi-column fault tree.​​Figure 3 The single-column fault tree structure in the above formula is consistent, and the embodiment of the application will not be described again. Based on the first multi-column fault tree constructed above, the second system failure probability Q Figure 7 is calculated corresponding to the first multi-column safety injection scheme. 21 As shown in the following formula:

[0109]

[0110] Wherein, F ijk 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, wherein 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 multi-column safety injection scheme, a second multi-column fault tree with the same number of branch nodes as the number of nodes is established.

[0112] In the embodiment of the application, the current execution end establishes a second multi-column fault tree with the same number of branch nodes as the number of nodes divided in the second multi-column safety injection scheme, as shown in the following formula: Figure 8 Figure 8 If the second multi-column fault tree in the above formula is divided into the first section to the x-th section, the second multi-column fault tree contains x number of branch nodes. Figure 8 The tree structure of the k-th column fault tree corresponding to the device in the x-th section is as shown in the following formula: Figure 9 Based on the second multi-column fault tree constructed above Figure 8 and Figure 9 , the second system failure probability Q 22 corresponding to the second multi-column safety injection scheme is calculated.As shown in the following formula:

[0113]

[0114] Wherein, F ijkx 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, wherein o and p are the range of the device level in the x-th section.

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

[0116] In the embodiment of the application, the current execution end establishes a third multi-column fault tree with the same number of branch nodes as the highest device level in the third multi-column safety injection scheme, as shown in the following formula: Figure 10 Figure 10 The fault tree of each branch node in the above formula is the same as Figure 3 ​The single-column fault tree structure is consistent, 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] Wherein, F ijk Indicates the failure probability of the i-th failure mode of the j-th level device of the k-th column, 1≤i≤n, 1≤j≤m, 2≤k≤l.

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

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

[0121] Determining the minimum value of the to-be-analyzed system failure probability, and determining the multi-column safety injection scheme corresponding to the minimum value as the safety injection system design scheme.

[0122] In the embodiment of the application, the current execution end compares each second system failure probability calculated with the preset safety probability target, determines the second system failure probability less than or equal to the preset safety probability target as the to-be-analyzed system failure probability, and then determines at least one to-be-analyzed system failure probability from each second system failure probability that meets the safety requirement. Then, the values of each to-be-analyzed system failure probability are compared to determine the minimum value, and the multi-column safety injection scheme corresponding to the minimum value is determined as the relatively optimal scheme, that is, the target safety injection system design scheme, combined with the containment arrangement of the floating reactor, the system design scheme is finally solidified.

[0123] The embodiment of the present application provides a design method of a safe injection system, compared with the prior art, the present application constructs a single-column safe injection scheme containing 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 safe injection scheme; determines a first system failure probability corresponding to the single-column safe injection scheme based on the single-column fault tree; and judges whether the first system failure probability meets a safety requirement; if the first system failure probability meets the safety requirement, the single-column safe injection scheme is determined as a safe injection system design scheme; if the first system failure probability does not meet the safety requirement, a plurality of connection modes of the water tank, the isolation valve, the pump and the check valve are used to construct a plurality of safe injection schemes corresponding to various connection modes, and a plurality of fault trees corresponding to each of the plurality of safe injection schemes are respectively established; the second system failure probability corresponding to each of the plurality of safe injection schemes is respectively determined based on the plurality of fault trees; and the safe injection system design scheme is determined from each of the plurality of safe injection schemes based on each of the second system failure probabilities. The present application can consider the space constraint conditions determined according to the overall design requirements of the floating type reactor, quickly propose a safe injection system design scheme meeting the functional requirements and reliability requirements. And significantly improve the design efficiency of the safe injection system design scheme of the floating type reactor, optimize the resource allocation, and provide strong support for optimizing the overall performance of the safety system of the floating type reactor.

[0124] As an implementation of the method shown in the above Figure 1 The embodiment of the present application provides a design device of a safe injection system, as shown in the above Figure 11 The device comprises:

[0125] A single-column construction module 21 is used for constructing a single-column safe injection scheme containing 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 safe injection scheme;

[0126] A judgment module 22 is used for determining a first system failure probability corresponding to the single-column safe injection scheme based on the single-column fault tree; and judging whether the first system failure probability meets a safety requirement;

[0127] A first determination module 23 is used for determining the single-column safe injection scheme as a safe injection system design scheme if the first system failure probability meets the safety requirement;

[0128] A plurality of column construction modules 24 are used for constructing a plurality of safe injection schemes corresponding to various connection modes based on a plurality of connection modes of a water tank, an isolation valve, a pump and a check valve if the first system failure probability does not meet the safety requirement, and a plurality of fault trees corresponding to each of the plurality of safe injection schemes are respectively established;

[0129] The second determining module 25 is configured to determine a second system failure probability corresponding to each of the multi-column safety injection schemes based on the multi-column fault trees respectively, and determine the safety injection system design scheme from each of the multi-column safety injection schemes based on the second system failure probability.

[0130] Further, the single-column constructing module 21 is further configured to:

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

[0132] obtain a failure mode of each of the devices, and establish the single-column fault tree based on the device level corresponding to each of the devices and the failure mode.

[0133] Further, the judging module 22 comprises a probability calculating unit, which is configured to:

[0134] obtain a failure probability corresponding to each of the failure modes in the single-column fault tree;

[0135] sum up each of the failure probabilities to obtain the first system failure probability.

[0136] Further, the device further comprises a restriction condition determining module, which is configured to:

[0137] determine a space constraint condition of the safety injection system based on a space volume of a containment vessel in the floating type reactor;

[0138] obtain volumes of the water tank, the isolation valve, the pump, the check valve and the connecting pipeline, and determine a number of safety injection columns that can be accommodated in the containment vessel in combination with the space constraint condition.

[0139] Further, the multi-column constructing module 24 comprises a scheme designing unit, which is configured to:

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

[0141] divide the water tank, the isolation valve, the pump and the check valve into multiple sections based on a commonly connected pipeline, sequentially connect the devices in each of the sections and then connect the devices in parallel to each other to obtain a second multi-column safety injection scheme;

[0142] parallel connect all the devices except the water tank according to the device level, and sequentially connect the parallel connected structure through the commonly connected pipeline to obtain a third multi-column safety injection scheme.

[0143] Further, the multi-column construction module 24 further comprises a fault tree construction unit, which is configured to:

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

[0145] establish a second multi-column fault tree comprising a same number of branch nodes as the number of nodes divided in the second multi-column safety injection scheme;

[0146] establish a third multi-column fault tree comprising a same number of branch nodes as the highest device level in the third multi-column safety injection scheme.

[0147] Further, the second determination module 25 is further configured to:

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

[0149] determine a minimum value of the to-be-analyzed system failure probabilities, and determine the multi-column safety injection scheme corresponding to the minimum value as the safety injection system design scheme.

[0150] The embodiment of the present application provides a safety injection system design device, compared with the prior art, the present application constructs a single-column safety injection scheme comprising 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 a safety requirement; if the first system failure probability meets the safety requirement, 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 requirement, a plurality of multi-column safety injection schemes corresponding to a plurality of connection modes of the water tank, the isolation valve, the pump and the check valve are constructed based on the plurality of connection modes, and a plurality of multi-column fault trees corresponding to the plurality of multi-column safety injection schemes are respectively established; a second system failure probability corresponding to each of the plurality of multi-column safety injection schemes is respectively determined based on the plurality of multi-column fault trees; and the safety injection system design scheme is determined from each of the plurality of multi-column safety injection schemes based on each of the second system failure probabilities. The present application can consider the spatial constraint conditions determined according to the overall design requirements of the floating type reactor, quickly propose a safety injection system design scheme meeting the functional requirements and reliability requirements. And significantly improve the design efficiency of the safety injection system design scheme of the floating type reactor, optimize the resource allocation, and provide strong support for optimizing the overall performance of the safety system of the floating type reactor.

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

[0152] Figure 12 A schematic structural diagram 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 Figure 12 As shown, the computer device may include: a processor 302 , a communications interface 304 , a memory 306 , and a communication bus 308 .

[0154] The processor 302 , the communication interface 304 , and the memory 306 communicate with each other via a 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 configured to execute the program 310 , and specifically to execute the relevant steps of the above-mentioned method for designing a safe injection system.

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

[0158] Processor 302 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors included in a computer device may be of the same type, such as one or more CPUs, or may be 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 cause 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 safe injection scheme based on the single-column fault tree; and determine whether the first system failure probability meets a safety requirement;

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

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

[0165] determine a second system failure probability corresponding to each of the plurality of safe injection schemes based on the plurality of fault trees respectively; and determine the safe injection system design scheme from each of the plurality of safe injection schemes based on each of the second system failure probabilities.

[0166] Obviously, those skilled in the art should understand that each module or each step of the present application described above can be realized by a general computing device, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, and optionally, each module or each step can be realized by program codes executable by a computing device, so that each module or each step can be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described can be executed in different order, or each module or each step can be manufactured as an integrated circuit module, or multiple modules or steps can be manufactured as a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0167] The preferred embodiments of the present application have been described above with the preferred embodiments; however, the present application is not limited to the above examples, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A design method for a safety injection system, characterized in that: include: Construct 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; The single-column safety injection scheme represents a scheme having only one injection path; the single-column fault tree includes failure modes of the equipment; 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, constructing multiple columns of safety injection schemes corresponding to various connection modes of the water tank, the isolation valve, the pump, and the check valve, and respectively establishing multiple columns of fault trees corresponding to each of the multiple columns of safety injection schemes; The multiple columns of safe injection protocols represent protocols with multiple injection routes; Determining a second system failure probability corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees; and 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; The determining, based on the single-column fault tree, a first system failure probability corresponding to the single-column safety injection scheme includes: Obtaining the failure probability corresponding to each failure mode in the single-column fault tree; Summing the failure probabilities to obtain the first system failure probability; The determining of the second system failure probability corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees comprises at least one of the following formulas: in, F ijk represents the failure probability of the i-th failure mode of the j-th level device in the k-th column, F ijkx represents the failure probability of the i-th failure mode of the j-th level equipment in the k-th column of the x-th section, n is the total number of levels, m is the total number of failure modes, l is the number of branch nodes, o and p are the ranges of the equipment level in section x, d The total number of sections.

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 the devices in the single-column safe 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 Before constructing a multi-column safety injection scheme corresponding to various connection modes of the water tank, the isolation valve, the pump, and the check valve, the method further includes: Determine the spatial constraints of the safety injection system based on the spatial volume of the containment vessel 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 vessel is determined in combination with the space constraints.

4. The method according to claim 1, wherein The multiple connection modes of the water tank, isolation valve, pump and check valve are used to construct a multi-column safety injection solution corresponding to each connection mode, including: Connecting individual water tanks, isolation valves, pumps, and check valves into independent single columns, and connecting each single column in parallel to the reactor pressure vessel to obtain a first multi-column safety injection solution; The water tank, isolation valve, pump and check valve are divided into multiple sections based on the commonly connected pipes. The equipment in each section is connected in sequence and then connected in parallel to obtain a second multi-column safety injection solution; 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 solution.

5. The method according to claim 4, characterized in that The step of respectively establishing multiple columns of fault trees corresponding to the multiple columns of safety injection schemes comprises: Establishing a first multi-column fault tree having 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.

6. The method according to any one of claims 1 to 5, characterized in that The step of determining the safety injection system design solution from a plurality of safety injection solutions based on the failure probabilities of the second systems includes: Determining, from each of the second system failure probabilities, at least one failure probability of the system to be analyzed that meets the safety requirements; 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.

7. A design device for a safety injection system, characterized in that: include: Single-column building blocks for constructing 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; The single-column safety injection scheme represents a scheme having only one injection path; the single-column fault tree includes failure modes of the equipment; 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 determining module, configured to determine the single-column safety injection solution as a safety injection system design solution if the first system failure probability meets the safety requirement; a multi-column construction module, configured to construct, if the failure probability of the first system does not meet the safety requirement, 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, and respectively establish a multi-column fault tree corresponding to each of the multi-column safety injection schemes; The multiple columns of safe injection protocols represent protocols with multiple injection routes; a second determination module, configured to determine, based on the multiple columns of fault trees, second system failure probabilities corresponding to the multiple columns of safety injection solutions; and determine, based on the respective second system failure probabilities, the safety injection system design solution from the multiple columns of safety injection solutions; The determining, based on the single-column fault tree, a first system failure probability corresponding to the single-column safety injection scheme includes: Obtaining the failure probability corresponding to each failure mode in the single-column fault tree; Summing the failure probabilities to obtain the first system failure probability; The determining of the second system failure probability corresponding to each of the plurality of safety injection schemes based on the plurality of fault trees comprises at least one of the following formulas: in, F ijk represents the failure probability of the i-th failure mode of the j-th level device in the k-th column, F ijkx represents the failure probability of the i-th failure mode of the j-th level equipment in the k-th column of the x-th section, n is the total number of levels, m is the total number of failure modes, l is the number of branch nodes, o and p are the ranges of the equipment level in section x, d The total number of sections.

8. A storage medium storing at least one executable instruction, wherein the executable instruction executes an operation corresponding to the design method of a safe injection system according to any one of claims 1 to 6.

9. 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 to 6.

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