CN110766255B - Method and device for determining security level of item - Google Patents

Method and device for determining security level of item Download PDF

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CN110766255B
CN110766255B CN201810846811.1A CN201810846811A CN110766255B CN 110766255 B CN110766255 B CN 110766255B CN 201810846811 A CN201810846811 A CN 201810846811A CN 110766255 B CN110766255 B CN 110766255B
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security
safety
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event
parameter
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CN110766255A (en
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陈石
胡凌生
万砺珂
赵鑫樾
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Hualong International Nuclear Power Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/10—Services
    • G06Q50/26—Government or public services
    • G06Q50/265—Personal security, identity or safety
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

Abstract

The invention provides a method and a device for determining the safety level of an item, which are applied to a nuclear power station, wherein the method comprises the following steps: obtaining a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively related to an influence coefficient of the first safety function, the influence coefficient comprises at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failed execution of the first safety function; determining a security level of a target item according to a security parameter of the target item. The method for determining the safety level of the item provided by the embodiment of the invention has a wide application range.

Description

Method and device for determining security level of item
Technical Field
The embodiment of the invention relates to the technical field of nuclear power station safety level division, in particular to a method and a device for determining an item safety level.
Background
Because the nuclear power plant involves potential safety hazards such as nuclear radiation and high voltage, the safety requirements of various safety levels need to be met by items such as systems, equipment and structures in the nuclear power plant, so as to ensure safe and stable operation of the nuclear power plant. Wherein, the higher the security level of an item, the higher the requirements for design, manufacture, inspection, testing, etc. of that item.
In the related art, the security level of an item is classified using a determinism method that performs security level classification according to the importance of a security function performed by the item and the influence of a failure. For example: by adopting a determinism method, dividing the bearing equipment items into four safety levels from high to low according to the importance of the performed safety function: level 1 secure, level 2 secure, level 3 secure, level non-secure. Wherein, the safe level 1 refers to an item which forms a reactor coolant pressure boundary and can cause a loss of coolant accident if the reactor coolant pressure boundary fails; the safe level 2 refers to equipment, pipelines and items for preventing the time working condition caused by the predicted operation time, wherein the equipment and the pipelines belong to the pressure boundary of the reactor coolant, and the loss of the reactor coolant caused by failure does not exceed the water replenishing quantity provided by a normal water replenishing system, or the items for reducing the accident working condition consequences under the condition of an accident; level 3 safety refers to items used to cool level 2 safety equipment or to support and ensure the operation of the safety equipment.
The determinism method in the related art can only classify the safety level according to the importance degree of the safety function and the influence generated by failure, so that the classification accuracy is not high, and the determinism method is not convenient for classifying the safety level of a new item with unknown importance degree and influence generated by failure.
Therefore, the method for determining the safety level of the item in the related art has the defect of small application range.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining an item security level, which are used for solving the problem of small application range of a method for determining the item security level in the related art.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for determining an item security level, which is applied to a nuclear power plant, and the method includes:
obtaining a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively related to an influence coefficient of the first safety function, the influence coefficient comprises at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failed execution of the first safety function;
determining a security level of the target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function.
In a second aspect, an embodiment of the present invention further provides an apparatus for determining an item security level, where the apparatus is applied to a nuclear power plant, and the apparatus includes:
an obtaining module, configured to obtain a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, and the influence coefficient includes at least one of a probability of executing the first safety function in a case of an originating event target originating event, a time interval from an occurrence of the originating event target originating event to an execution of the first safety function, a duration of the execution of the first safety function, and an event value of a consequence event resulting from a failure of the execution of the first safety function;
a determination module configured to determine a security level of a target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the method for determining an item security level as described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the method for determining the security level of an item described above.
In an embodiment of the present invention, a safety parameter of a first safety function of the nuclear power plant is obtained, wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, the influence coefficient includes at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failure of execution of the first safety function; determining a security level of the target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function. Therefore, various influence factors of the safety function can be taken into the safety parameters of the safety function in an influence coefficient mode, and the safety level of the item is determined according to the safety parameters of the safety function executed by the item, so that the adaptability of the method for determining the safety level of the item is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flow chart of a method for determining a security level of an item according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for determining a security level of an item provided by an embodiment of the present invention;
FIG. 3 is a flow chart of another method for determining a security level of an item provided by an embodiment of the present invention;
fig. 4 is a block diagram of an apparatus for determining a security level of an item according to an embodiment of the present invention;
FIG. 5 is a block diagram of another apparatus for determining a security level of an item provided by an embodiment of the present invention;
fig. 6 is a block diagram of another apparatus for determining the security level of an item provided by an embodiment of the present invention;
fig. 7 is a block diagram of another apparatus for determining a security level of an item according to an embodiment of the present invention;
fig. 8 is a block diagram of another apparatus for determining the security level of an item provided by an embodiment of the present invention;
fig. 9 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for determining the safety level of the item is used for determining the safety level of the item which executes the safety function in the nuclear power station, wherein the item can be a protection device or a software system, and especially can be equipment. After the safety level of the item is determined, the method can be used for determining the design, structure, reliability and other indexes of the item so as to meet the requirement of the safety level determined by the method for determining the safety level of the item, thereby improving the reliability of the nuclear power station.
Of course, the application of the security level of the item determined by the method for determining the security level of the item provided by the present invention is not limited to the design, structure, reliability and other indicators for determining the item, and is not limited herein.
Referring to fig. 1, fig. 1 is a flowchart of a method for determining an item security level according to an embodiment of the present invention, where the method for determining an item security level may be applied to a nuclear power plant. As shown in fig. 1, the method for determining the security level of an item includes the following steps:
step 101, obtaining a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively related to an influence coefficient of the first safety function, and the influence coefficient comprises at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event generated by execution failure of the first safety function.
Wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, meaning that if the influence coefficient increases, the safety parameter also increases, and if the influence coefficient decreases, the safety parameter also decreases.
In addition, the time interval between the occurrence of the originating event and the execution of the first security function may be a degree of urgency for executing the first security function.
In addition, after the starting event target starting event occurs, different security functions may be executed, and the probability of executing the first security function may be determined through probability analysis or through data execution on the history of the previous security functions.
It should be noted that, depending on the originating event, the security function performed for the originating event may be different, and when the accident size of the originating event is different, the device performing the same security function may be different, wherein the originating event may refer to an event with a fault.
For example: when the originating event is small, the first security function engages one standby device to be able to effectively control the originating event, but when the originating event is large, the first security function requires two standby devices to be engaged to effectively control the large originating event.
In addition, the event value of the above-mentioned consequence event may be an evaluation value of an accident condition caused by unsuccessful or non-executed safety function execution after the occurrence of the initiating event, for example: leakage amount of radioactive substance, and temperature exceeding value when the temperature is too high.
It should be noted that, in addition to the above-listed influencing factors, the influencing factors may include other parameters such as an accident control effect evaluation value, an energy loss value, and the like for performing the first safety function, and are not particularly limited herein.
In this step, the influence factors of the security function are included in the security parameters of the security function in the form of the numerical values of the influence coefficients, and the safety importance degree of the security function can be clearly reflected by the numerical value of the security parameter, so that the importance degree of the security function can be more easily and conveniently identified, and a basis is provided for dividing the security level of the item in the step 102.
Step 102, determining a security level of a target item according to a security parameter of the target item, wherein the target item is related to the first security function, and the security parameter of the target item is equal to the security parameter of the first security function.
Wherein the item related to the security function may be an item for performing the security function when an originating event target originating event occurs.
It should be noted that, when different originating events occur, the items performing the same security function may be different, for example: the cooling safety function puts a backup cooling device into operation when a minor cooling initiation event occurs, wherein the item associated with the cooling safety function is a backup cooling device; if a large cooling fault occurs, the cooling safety function puts into operation two backup cooling devices, in which case the items relevant to the cooling safety function are the two backup cooling devices.
In addition, the item may be configured to execute a plurality of safety functions, and when safety parameters of a plurality of safety functions executed by the same item are different, the first safety function may be a safety function with a maximum safety parameter value among the plurality of safety functions.
In addition, preset intervals corresponding to the safety levels in a one-to-one mode can be preset, and the safety level of the item can be determined to be the safety level corresponding to one preset interval by comparing the safety parameter displacement of the item within one preset interval.
Through this step, it can be determined that the security parameter of the item is equal to the security parameter of the security function performed by the item, and the security level of the item is determined according to the magnitude of the security parameter of the item. Therefore, the security level of each item is determined by comparing numerical values, so that the difficulty of the method for determining the security level of the item is simplified, and the application range of the method for determining the security level of the item is widened.
In an embodiment of the present invention, a safety parameter of a first safety function of the nuclear power plant is obtained, wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, the influence coefficient includes at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failure of execution of the first safety function; determining a security level of the target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function. Therefore, various influence factors of the safety function can be taken into the safety parameters of the safety function in an influence coefficient mode, and the safety level of the item is determined according to the safety parameters of the safety function executed by the item, so that the adaptability of the method for determining the safety level of the item is improved.
Fig. 2 is a flowchart of another method for determining the safety level of an item according to an embodiment of the present invention, and the method is applied to a nuclear power plant. As shown in fig. 2, the method comprises the steps of:
step 201, obtaining a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively related to an influence coefficient of the first safety function, and the influence coefficient comprises at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event generated by execution failure of the first safety function.
As an alternative embodiment, step 201 includes:
using the formula S First of all Determining a security parameter S of the first security function First of all ；
Wherein f is the probability of executing the first security function in the case of the occurrence of the originating event target originating event, μ (t) is the time interval from the occurrence of the originating event target originating event to the execution of the first security function, β (t) is the duration of the execution of the first security function, and c is the event value of a consequence event resulting from the failure of the execution of the first security function.
Wherein c may be a leakage amount of the radioactive substance leakage event caused by the failure of the first safety function. Specifically, the specific value of c may be determined by way of a working condition analysis.
In addition, the specific values of μ (t) and β (t) may be determined according to the originating event occurring and the configuration of the originating event by the first security function, for example: when the water level of the steam generator is abnormally failed, the reaction time of the first safety function to the failure is configured to be 0.1s, and the duration is configured to be 30 s.
In addition, μ (t) may be referred to as a degree of urgency.
Of course, in the nuclear power plant shown, the configuration of the reaction time and duration of the first safety function may be different from the above-mentioned distances.
In this embodiment, a specific calculation formula is provided for calculating the safety parameter of the first safety function, and in the process of determining the safety parameter, only the value of the corresponding coefficient needs to be substituted to obtain the specific value of the safety parameter, thereby simplifying the complexity of determining the safety parameter.
Of course, the security of the first security function is determinedThe formula of the full parameter is not limited to S only First of all F × μ (t) × β (t) × c, for example: each influence coefficient may be assigned a weight, and the weight of the influence coefficient having a higher degree of importance may be increased.
In addition, the formula for calculating the safety parameter may be modified according to whether the first safety function has the urgency degree μ (t) and the duration β (t) as follows: s First of all F × β (t) × c or S First of all ＝f×μ(t)×c。
As an alternative embodiment, after the originating event target originating event occurs and before the first safety function is executed, the nuclear power plant further executes a second safety function, and the step 201 includes:
determining a first security parameter S of the first security function in case the execution of the second security function is successful 1 ＝f 0 ×p 1 ×μ 1 (t)×β 1 (t)×c 1 ；
Wherein f is 0 Frequency of target originating events for the originating event, p 1 Is the probability of the first security function being performed, mu 1 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 1 (t) duration of execution of the first safety function, c 1 An event value of a consequence event resulting from a failure to execute the first security function;
determining a second security parameter S of the first security function in case of a failure of the execution of the second security function 2 ＝f 0 ×p 2 ×μ 2 (t)×β 2 (t)×c 2 ；
Wherein p is 2 Is the probability of the first security function being performed, mu 2 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 2 (t) duration of execution of the first safety function, c 2 And executing event values of the consequence events generated by failure for the second safety function and the first safety function.
As shown in table 1, when the execution of the second security function is successful and the execution is not successful, the probability, urgency, duration, etc. of executing the first security function will change.
TABLE 1
Figure BDA0001746787690000081
Wherein the content of the first and second substances,
Figure BDA0001746787690000083
Figure BDA0001746787690000084
for representing a time coefficient for performing the first security function.
In addition, as shown in table 2, successful execution and unsuccessful execution of the second security function will also result in c1 not having the same value as c 2.
TABLE 2
Figure BDA0001746787690000082
The sequence described in table 2 refers to a series of security functions executed after the occurrence of the initiating event and the results of executing the security functions, and the execution results and the occurring initiating event of each security function affect the time consequences.
In this embodiment, when two security functions need to be executed after an originating event occurs, a calculation formula of security parameters of the security function to be executed after specific calculation is provided. Therefore, the method for determining the security level of the item can be suitable for the situation of executing two security functions in sequence, and the application range of the method for determining the security level of the item is widened.
It should be noted that after the originating event occurs, 3 or more security functions may be executed, and so on, in the same way as the second security function and the first security function are executed, until the security parameters capable of effectively controlling the last executed security function of the originating event are determined.
Step 202, determining an item related to executing the first safety function through fault tree analysis.
The item associated with performing the first safety function may be, inter alia, a device for performing the first safety function.
In addition, the fault tree analysis method may simulate which devices execute actions when the first safety function is executed after an initial event occurs, so as to determine that the devices are related to the first safety function.
Through this step, the correlation between the item and the first security function can be determined, thereby providing a basis for determining the security level of the item.
Step 203, if the target item is related to a plurality of safety functions, determining that the safety parameter of the target item is equal to the safety parameter of the first safety function, where the first safety function is a safety function with a maximum safety parameter value among the plurality of safety functions.
As an alternative embodiment, the step 203 includes:
if it is determined through the fault analysis that the target item is related to the first safety function both in the case where the second safety function is successfully executed and in the case where the second safety function is failed to be executed, it is determined that the safety parameter of the target item is equal to the maximum value of the first safety parameter and the second safety parameter.
In this embodiment, under the condition that the second safety function is successfully executed or unsuccessfully executed, the safety parameters of the first safety function may be different, and therefore, the one with the largest numerical value in the first safety parameter and the second safety parameter is selected as the safety parameter of the target item, so that the safety level determined in step 204 can ensure that the target item meets various safety requirements, and the reliability of the method for determining the safety level of the item is improved.
In this step, the maximum security parameter value is selected from the plurality of security functions related to the target item as the security parameter of the target item, so that the security level determined in step 204 can ensure that the target item meets various security requirements, thereby improving the reliability of the method for determining the security level of the item.
And 204, determining the safety level of the target item according to the safety parameters of the first safety function.
As an alternative implementation, the values of the safety parameters may be divided into value intervals corresponding to the safety classes one by one according to the pairs of devices in the nuclear power plant, for which the safety classes have been determined.
Specifically, the method in steps 201 to 203 may be adopted to determine the security parameters of a plurality of devices, and compare the determined security levels of the devices with the security parameters of the devices, so as to obtain the value intervals corresponding to the security levels one to one.
In this way, after the security parameter of the new device is determined, the security level of the new device can be determined to be the security level corresponding to the value range only by looking at which value range the security parameter is located in.
In this embodiment, the numerical value interval of the security parameter is checked by using the security level determined by the existing device, so that the accuracy of the method for determining the security level of the item is higher.
In the embodiment of the invention, the maximum safety parameter value is selected from a plurality of safety functions related to the target item as the safety parameter of the target item, so that the safety level determined according to the maximum safety parameter is the highest, the safety level determined by the target item can be ensured to meet various safety requirements, and the reliability of the method for determining the safety level of the item is improved.
Referring to fig. 3, a flowchart of another method for determining an item security level according to an embodiment of the present invention is shown, where the method is applied to a nuclear power plant, and as shown in fig. 3, the method includes the following steps:
step 301, event sequence analysis, determining probability f of executing security function anddegree or duration of urgency
Figure BDA0001746787690000101
Wherein the content of the first and second substances,
Figure BDA0001746787690000102
is either one of the degree of urgency for execution of the safety function μ (t), the duration of execution of the safety function β (t), or the product of both
Figure BDA0001746787690000103
In addition, the degree of urgency may also be referred to as the time interval from the occurrence of the originating event to the execution of the security function. The event sequence analysis may be to determine the value of each data shown in 1 by simulation analysis, viewing historical data, obtaining parameters of security functions, and the like after the occurrence of the originating event.
Step 302, analyzing the working conditions, and determining the accident working conditions generated after the execution of the safety function fails and the leakage dose c of the radioactive substances caused by the working conditions.
Step 303, calculating the security parameter S of the security function,
Figure BDA0001746787690000104
wherein i is a positive integer, and can be used to distinguish the security parameters of multiple security functions when the value of i changes.
Step 304, fault tree analysis, determining the correlation between the safety function and the equipment.
The correlation may be a correlation between a related device for performing the security function and the security function being performed.
Step 305, if the target device is related to a plurality of security functions, determining that the security parameter with the largest value in the plurality of security functions is the security parameter of the target device.
And step 306, checking the numerical value interval of the safety parameter corresponding to each safety level.
Most of the devices in the existing nuclear power plant have been determined for safety level based on experience or by using a deterministic method.
In this step, the device with the determined security level is used to divide the security parameters obtained in the above step into a plurality of value intervals corresponding to the security levels one to one, and when the security parameters determined in the step 301 and the step 305 are located in a certain value interval, whether the security level corresponding to the value interval matches with the existing security level of the device is determined.
If not, the numerical value interval can be corrected, so that the accuracy of the method for determining the safety level of the item is improved.
Step 307, comparing the security parameter of the target device with the value interval, and determining the security level of the target device.
The embodiment of the invention adopts a formula
Figure BDA0001746787690000111
And determining the safety parameters of the safety function, and correcting the numerical value intervals of the safety parameters corresponding to the safety levels by adopting the safety levels of the existing equipment, thereby improving the accuracy of the method for determining the safety levels of the items.
Fig. 4 is a structural diagram of an apparatus for determining an item safety level according to an embodiment of the present invention, where the apparatus 400 for determining an item safety level is applied to a nuclear power plant. As shown in fig. 4, the apparatus 400 includes:
an obtaining module 401, configured to obtain a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, the influence coefficient includes at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failure of execution of the first safety function;
a determining module 402, configured to determine a security level of a target item according to a security parameter of the target item, where the target item is related to the first security function, and the security parameter of the target item is equal to the security parameter of the first security function.
Optionally, as shown in fig. 5, the obtaining module 401 includes:
a first determination unit 4011 for employing formula S First of all Determining a security parameter S of the first security function First of all ；
Wherein f is the probability of executing the first security function in the case of the occurrence of the originating event target originating event, μ (t) is the time interval from the occurrence of the originating event target originating event to the execution of the first security function, β (t) is the duration of the execution of the first security function, and c is the event value of a consequence event resulting from the failure of the execution of the first security function.
Optionally, as shown in fig. 6, the determining module 402 includes:
a second determination unit 4021, configured to determine, through fault tree analysis, an item related to performing the first safety function;
a third determining unit 4022, configured to determine that the security parameter of the target item is equal to the security parameter of the first security function if the target item is related to multiple security functions, where the first security function is a security function with a largest security parameter value among the multiple security functions;
a fourth determining unit 4023, configured to determine a security level of the target item according to the security parameter of the first security function.
Optionally, as shown in fig. 7, after the originating event target originating event occurs and before the first safety function is executed, the nuclear power plant further executes a second safety function, and the obtaining module 401 includes:
a fifth determining unit 4012, configured to determine the first security parameter S of the first security function when the second security function is successfully executed 1 ＝f 0 ×p 1 ×μ 1 (t)×β 1 (t)×c 1 ；
Wherein f is 0 Frequency of target originating events for the originating event, p 1 Is the probability of the first security function being performed, mu 1 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 1 (t) duration of execution of the first safety function, c 1 An event value of a consequence event resulting from a failure to execute the first security function;
a sixth determining unit 4013 configured to determine a second security parameter S of the first security function in case of failure of execution of the second security function 2 ＝f 0 ×p 2 ×μ 2 (t)×β 2 (t)×c 2 ；
Wherein p is 2 Is the probability of the first security function being performed, mu 2 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 2 (t) duration of execution of the first safety function, c 2 And executing event values of the consequence events generated by failure for the second safety function and the first safety function.
Optionally, as shown in fig. 8, the third determining unit 4022 includes:
a determining subunit 40221, configured to determine that the safety parameter of the target item is equal to the maximum value of the first safety parameter and the second safety parameter if it is determined, through the fault analysis, that the target item is related to the first safety function both in a case where the second safety function is successfully executed and in a case where the second safety function is failed to be executed.
The device for determining the security level of the item provided by the embodiment of the present invention can implement the steps of the method for determining the security level of the item provided by the method embodiments shown in fig. 1 to 3, and obtain the same beneficial effects, and in order to avoid repetition, the details are not repeated herein.
As shown in fig. 9, an embodiment of the present invention further provides an electronic device, which includes a processor 901, a memory 902, a transceiver 903, and a computer program stored on the memory 902 and executable on the processor 901, where the transceiver 903 may be configured to receive or transmit an influence coefficient of a security function, and the computer program, when executed by the processor 901, may determine a security level of an item related to the security function according to the influence coefficient of the security function. The steps of the method for determining the security level of an item provided in the method embodiments shown in fig. 1 to fig. 3 are implemented, and the same beneficial effects are obtained, and are not described herein again to avoid repetition.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for determining the security level of an item provided in the method embodiments shown in fig. 1 to 3 are implemented, and the same beneficial effects are obtained, and are not described herein again to avoid repetition.
The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method for determining the safety level of an item is applied to a nuclear power station, and is characterized by comprising the following steps:
obtaining a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively related to an influence coefficient of the first safety function, the influence coefficient comprises at least one of a probability of executing the first safety function in case of occurrence of an originating event target originating event, a time interval from occurrence of the originating event target originating event to execution of the first safety function, a duration of execution of the first safety function, and an event value of a consequence event resulting from failed execution of the first safety function;
determining a security level of a target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function;
the step of determining a security level of the target item in dependence on the security parameter of the target item comprises:
determining, by fault tree analysis, an item associated with performing the first safety function;
if the target item is related to a plurality of safety functions, determining that the safety parameter of the target item is equal to the safety parameter of the first safety function, wherein the first safety function is the safety function with the maximum safety parameter value in the plurality of safety functions;
and determining the safety level of the target item according to the safety parameters of the first safety function.
2. The method of claim 1, wherein the step of obtaining safety parameters of the first safety function of the nuclear power plant comprises:
using the formula S First of all Determining a security parameter S of the first security function First of all ；
Wherein f is the probability of executing the first security function in the case of the occurrence of the originating event target originating event, μ (t) is the time interval from the occurrence of the originating event target originating event to the execution of the first security function, β (t) is the duration of the execution of the first security function, and c is the event value of a consequence event resulting from the failure of the execution of the first security function.
3. The method of claim 1, wherein after the originating event target originating event occurs and before the first safety function is performed, the nuclear power plant further performs a second safety function, and wherein the step of obtaining safety parameters of the first safety function of the nuclear power plant comprises:
determining a first security parameter S of the first security function in case the execution of the second security function is successful 1 ＝f 0 ×p 1 ×μ 1 (t)×β 1 (t)×c 1 ；
Wherein f is 0 Frequency of target originating events for the originating event, p 1 Is the probability of the first security function being performed, mu 1 (t) originating an event from the target where the originating event occurredTime interval, β, between execution of said first safety function 1 (t) duration of execution of the first safety function, c 1 An event value of a consequence event resulting from a failure to execute the first security function;
determining a second security parameter S of the first security function in case of a failed execution of the second security function 2 ＝f 0 ×p 2 ×μ 2 (t)×β 2 (t)×c 2 ；
Wherein p is 2 Is the probability of the first security function being performed, mu 2 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 2 (t) duration of execution of the first safety function, c 2 And executing event values of the consequence events generated by failure for the second safety function and the first safety function.
4. The method of claim 3, wherein the step of determining that the security parameter of the target item is equal to the security parameter of the first security function if the target item is associated with performing a plurality of security functions comprises:
if it is determined through the fault analysis that the target item is related to the first safety function both in the case where the second safety function is successfully executed and in the case where the second safety function is failed to be executed, it is determined that the safety parameter of the target item is equal to the maximum value of the first safety parameter and the second safety parameter.
5. An apparatus for determining an item safety level, for use in a nuclear power plant, the apparatus comprising:
an obtaining module, configured to obtain a safety parameter of a first safety function of the nuclear power plant, wherein the safety parameter is positively correlated to an influence coefficient of the first safety function, and the influence coefficient includes at least one of a probability of executing the first safety function in a case of an originating event target originating event, a time interval from an occurrence of the originating event target originating event to an execution of the first safety function, a duration of the execution of the first safety function, and an event value of a consequence event resulting from a failure of the execution of the first safety function;
a determining module for determining a security level of a target item according to a security parameter of the target item, wherein the target item is associated with the first security function, and the security parameter of the target item is equal to the security parameter of the first security function;
the determining module comprises:
a second determination unit for determining an item related to performing the first safety function through fault tree analysis;
a third determining unit, configured to determine that a security parameter of the target item is equal to a security parameter of the first security function if the target item is related to multiple security functions, where the first security function is a security function with a largest security parameter value among the multiple security functions;
a fourth determining unit, configured to determine a security level of the target item according to the security parameter of the first security function.
6. The apparatus of claim 5, wherein the obtaining module comprises:
a first determination unit for employing the formula S First of all Determining a security parameter S of the first security function First of all ；
Wherein f is the probability of executing the first security function in the case of the occurrence of the originating event target originating event, μ (t) is the time interval from the occurrence of the originating event target originating event to the execution of the first security function, β (t) is the duration of the execution of the first security function, and c is the event value of a consequence event resulting from the failure of the execution of the first security function.
7. The apparatus of claim 5, wherein the nuclear power plant further performs a second safety function after the originating event target originating event occurs and before the first safety function is performed, the obtaining module comprising:
a fifth determining unit, configured to determine the first security parameter S of the first security function if the second security function is successfully executed 1 ＝f 0 ×p 1 ×μ 1 (t)×β 1 (t)×c 1 ；
Wherein f is 0 Frequency of target originating events for the originating event, p 1 Is the probability of the first security function being performed, mu 1 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 1 (t) duration of execution of the first safety function, c 1 An event value of a consequence event resulting from a failure to execute the first security function;
a sixth determining unit, configured to determine a second security parameter S of the first security function in case of failure of execution of the second security function 2 ＝f 0 ×p 2 ×μ 2 (t)×β 2 (t)×c 2 ；
Wherein p is 2 Is the probability of the first security function being performed, mu 2 (t) is the time interval, β, between the occurrence of the originating event and the target originating event and the execution of the first security function 2 (t) duration of execution of the first safety function, c 2 And executing event values of the consequence events generated by failure for the second safety function and the first safety function.
8. The apparatus according to claim 7, wherein the third determining unit comprises:
a determining subunit, configured to determine that a security parameter of the target item is equal to a maximum value of the first security parameter and the second security parameter if, through the fault analysis, it is determined that the target item is related to the first security function both in a case where the second security function is successfully executed and in a case where the second security function is failed to be executed.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of determining a security level of an item of any of claims 1 to 4.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method for determining a security level of an item according to any one of claims 1 to 4.
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