A nuclear accident emergency response evaluation method and evaluation system

Abstract

The present invention belongs to the field of public nuclear safety technology, and discloses a nuclear accident emergency rescue action optimization analysis method and analysis system, which obtains protective measures plans, optimizes multiple emergency rescue action plans according to the front-end radiation field calculation results and the formulated emergency action plan (given emergency personnel departure time, forward and retreat routes plotted in the GIS system, protective measures taken, and transportation vehicles taken), and gives the most reasonable action plan suggestions. The present invention can implement targeted emergency protection measures analysis and evaluation for different elements of the evaluation target, such as various components of relevant measures, personnel related to various types of accidents, etc. The present invention can complete the dose evaluation and analysis functions of corresponding countermeasures or measures within the time specified by the system, and obtain accurate analysis results. The modules of the present invention are scientifically designed and implemented, and operate in an efficient and coordinated manner.

Description

Technical Field

[0001] The present invention belongs to the field of public nuclear safety technology, and in particular relates to a nuclear accident emergency response evaluation method and evaluation system. Background Art

[0002] At present, nuclear emergency decision-making is the basis of emergency response to nuclear power plant accidents. At present, a lot of research has been carried out on emergency decision support technology for nuclear accidents, and some nuclear emergency decision support systems have been developed with model prediction as the main function. Among them, the more representative ones are Europe's Real-time Online Decision Support System (RODOS), the United States' National Atmospheric Release Decision Support Capability System NARAC, and Japan's Global Environmental Emergency Dose Information Prediction System WSPEEDI. The existing emergency decision support systems are all based on the results of simulation calculations based on theoretical models of radionuclide diffusion, and in recent years, methods for real-time calculations based on nuclear accident monitoring data have been developed. However, the existing technology currently does not have a solution for comprehensive evaluation of nuclear accident emergency countermeasures.

[0003] Through the above analysis, the problems and defects of the existing technology are as follows: the existing technology currently has no solution for comprehensive evaluation of nuclear accident emergency response measures.

[0004] Currently, this field focuses more on the optimization analysis of radiation protection actions for the surrounding public after a nuclear accident. There is little attention paid to the action plans and radiation protection of emergency rescue personnel (such as emergency repair personnel, radiation monitoring personnel, decontamination personnel, medical rescue personnel, etc.). There is a lack of methods and tools that can quickly and effectively optimize and analyze emergency action plans.

[0005] The difficulty of solving the above problems and defects is:

[0006] (1) How to formulate a reasonable and feasible emergency action plan (including different action times, routes, transportation tools and radiation protection measures) in practice is a very difficult problem. Based on the source term release results and radiation field calculation results of the front-end system, the present invention combines the atmospheric radiation field distribution and plots in the GIS system to formulate multiple emergency action plans for selection;

[0007] (2) In practice, there is a lack of a reasonable and effective optimization analysis method and framework for emergency action plans. The present invention performs coordinate conversion on multiple candidate routes mapped in the GIS system, matches the emergency action plan with the radiation field calculation results, obtains the radiation field grid and residence time of the emergency personnel during their advance and evacuation, and further optimizes the calculation of the expected dose, preventable dose and residual dose of the emergency personnel on the route and on the scene.

[0008] The significance of solving the above problems and defects is:

[0009] The present invention proposes a reasonable and feasible emergency action plan formulation and optimization analysis method.

[0010] The present invention can give optimized emergency action plan suggestions, ensure that the on-site working time is maximized while ensuring that the exposure dose of emergency personnel does not exceed the limit, provide professional and technical support for nuclear accident emergency command organizations, and improve the scientificity, effectiveness and timeliness of the formulation of nuclear accident emergency action plans.

[0011] The present invention focuses on the optimization analysis problem of emergency rescue actions. The input of the model includes the action time, forward route, evacuation route, protective measures, transportation, dose limit, etc. of the emergency personnel. The optimization goal of the model is to maximize the on-site stay time (i.e., the time available for emergency operations) within the dose limit. The output of the model includes the arrival time at the scene, the maximum on-site stay time, the evacuation time, the route and the expected dose at the scene, the preventable dose, the remaining dose, etc. Finally, through the optimization calculation and analysis of the present invention, the optimal emergency action plan is obtained. Summary of the invention

[0012] In view of the problems existing in the prior art, the present invention provides a nuclear accident emergency response evaluation method and evaluation system. The present invention optimizes multiple emergency rescue action plans based on the front-end radiation field calculation results and the formulated emergency action plan (given the departure time of emergency personnel, the forward and retreat routes mapped in the GIS system, the protective measures taken, and the means of transportation taken), and gives the most reasonable action plan suggestions.

[0013] The present invention is implemented as follows: a nuclear accident emergency response evaluation system, the nuclear accident emergency response evaluation system comprising:

[0014] The emergency protection measures evaluation module is used to obtain the protection measures plan and conduct targeted emergency protection measures analysis and evaluation based on different elements of the evaluation target;

[0015] The accident emergency decision optimization module is used to perform the optimization analysis, evaluation and calculation of countermeasure actions according to specific accident consequences, interface requirements, data formats and overall task requirements;

[0016] A storage module, used to store the relevant results obtained and calculated;

[0017] The emergency rescue action determination module is used to verify the generated optimal emergency rescue action plan.

[0018] Furthermore, the emergency protection measures evaluation module includes:

[0019] Environmental data acquisition unit, used to acquire radioactive material concentration field and radiation field data;

[0020] A data extraction unit, used to extract the protective equipment information of the accident operation personnel and the task time and task path data from the protection measures plan;

[0021] An effectiveness parameter determination unit, for generating possible protective effectiveness parameters of the protective equipment based on the extracted protective equipment information;

[0022] A path setting unit, used for setting a path;

[0023] The evaluation unit is used to generate the evaluation results of the protection effectiveness evaluation strategy based on the acquired radioactive material concentration field and radiation field data, task time, and task path data according to the set multiple paths.

[0024] Furthermore, the operating personnel protective equipment information includes external radiation protection facilities and internal radiation protection equipment information.

[0025] Furthermore, the accident emergency decision optimization module includes:

[0026] The preventable dose calculation unit is used to calculate the expected dose and preventable dose for the early radiation protection measures to be adopted for different personnel based on the upstream meteorological data and dose field analysis data;

[0027] A protection countermeasure generation unit is used to prioritize radiation protection measures based on the evaluation results of the protection effectiveness evaluation strategy and the calculated expected dose and preventable dose, and to generate radiation protection countermeasures for emergency workers respectively;

[0028] The optimization unit is used to evaluate and optimize the generated protection countermeasures and emergency rescue action plans, and output the optimal emergency rescue action plan.

[0029] Furthermore, the emergency rescue action plan includes: entry path, entry start time, evacuation path and on-site protection parameters.

[0030] Another object of the present invention is to provide a nuclear accident emergency response evaluation method applied to the nuclear accident emergency response evaluation system, the nuclear accident emergency response evaluation method comprising:

[0031] Step 1: Obtain the protection measures plan and conduct targeted emergency protection measures analysis and evaluation based on different elements of the evaluation target;

[0032] Step 2: Based on the specific accident consequences, interface requirements, data format and overall mission requirements, the optimal analysis and evaluation calculation of countermeasure actions is carried out to generate the optimal emergency rescue action plan;

[0033] Step three: verify the generated optimal emergency rescue action plan.

[0034] Furthermore, in step 2, the optimization analysis and evaluation calculation of countermeasure actions is performed according to the specific accident consequences, interface requirements, data format and overall task requirements to generate the optimal emergency rescue action plan, including:

[0035] Based on upstream meteorological data and dose field analysis data, the expected dose and preventable dose are calculated for the early radiation protection measures to be adopted for different personnel; the radiation protection measures are prioritized based on the evaluation results of the protection effectiveness evaluation strategy and the calculated expected dose and preventable dose, and radiation protection countermeasures are generated for emergency workers respectively; the generated protection countermeasures and emergency rescue action plans are evaluated and optimized, and the optimal emergency rescue action plan is output.

[0036] Further, the optimization of the generated emergency rescue action plan includes:

[0037] Based on the specific values ​​of the accident consequences and the selected paths, time points and other parameters, the path information is extracted, and different time slices and sections are divided and combined in combination with the specific path conditions to construct the sample space to be optimized. The time slices are iterated and screened based on the analysis results of the emergency protection measures, and the optimization results are determined by comparing the grid structure of the area to be optimized and the specified relevant time points.

[0038] Furthermore, the optimizing the generated emergency rescue action plan also includes: optimizing the action decision, path suggestion, and entry time of the generated emergency rescue action plan.

[0039] Furthermore, the evaluation of the generated emergency rescue action plan includes: calculating the cumulative doses of the entry path, on-site stay and evacuation path stages respectively, and by adjusting the length of stay on the scene, on the premise that the total cumulative dose does not exceed the personal cumulative dose limit, calculating the maximum personal residual dose on the scene under the emergency rescue action plan, and using it as a reference for the dose threshold of the on-site operation of the emergency rescue action plan.

[0040] Furthermore, the step of evaluating and optimizing the generated emergency rescue action plan and outputting the optimal emergency rescue action plan includes the following steps:

[0041] (1) Obtain the entry path and evacuation path of each emergency rescue action plan respectively, and divide the entry path and evacuation path into a continuous set of small sections according to the grid size; at the same time, refer to the latitude and longitude coordinates of the incident site and the grid coordinates to map each path point to the closest grid point on the grid according to the latitude and longitude coordinates;

[0042] (2) Calculate the cumulative dose on each path for each emergency rescue action plan, iteratively calculate the cumulative dose of on-site stay and the cumulative dose on the evacuation path, and obtain the maximum possible on-site stay time and cumulative dose on-site stay, provided that the total cumulative dose of the protection plan does not exceed the personal cumulative dose limit;

[0043] (3) Sort each emergency rescue action plan according to the cumulative dose at the scene, and obtain the best emergency rescue action plan from the perspective of cumulative dose.

[0044] Furthermore, the total cumulative dose of the protection scheme is the sum of the cumulative dose of the entry path, the cumulative dose of the on-site stay, and the cumulative dose of the evacuation path.

[0045] Further, the step (2) comprises:

[0046] Calculate the cumulative dose of the entry path, obtain the specific time of arrival at the scene, and calculate the cumulative dose of the evacuation path according to the evacuation route and time; measure the relative size of the individual cumulative dose limit according to the corresponding cumulative doses of the entry route, evacuation route, and on-site stay; and iterate the calculation of the stay time based on the comparison results:

[0047] When the dose is below the dose limit, increase the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0048] When the dose exceeds the limit, reduce the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0049] It is sufficient when the result compared with the personal dose limit is basically close to (not higher than) and the difference is lower than the set threshold.

[0050] Furthermore, the calculation formula for the cumulative dose of the road section is as follows:

[0051] Cumulative dose of the path = ∑(cloud concentration of sub-section i × residence time on sub-section i × cloud dose conversion factor × plume external radiation shielding factor + cloud concentration of sub-section i × residence time on sub-section i × accumulated dose conversion factor × inhalation protection factor + (ground dry deposition concentration of sub-section i + ground wet deposition concentration of sub-section i) × residence time on sub-section i × ground external radiation dose rate conversion factor × ground external radiation shielding factor);

[0052] Among them, the smoke cloud dose conversion factor, the accumulated dose conversion factor, and the ground external exposure dose rate conversion factor are all dose conversion factors for the whole body; the smoke plume external exposure shielding factor and the ground external exposure shielding factor are the external exposure protection factors of the current section, and the inhalation protection factor is the internal exposure protection factor of the section; the smoke cloud concentration, ground dry deposition concentration, and ground wet deposition concentration of the sub-section i are all read from the concentration field result file.

[0053] In combination with all the above-mentioned technical solutions, the advantages and positive effects of the present invention are as follows: the present invention can realize different elements of the evaluation target and realize targeted analysis and evaluation of emergency protection measures under the condition of obtaining information such as the various components of relevant measures (such as resource type, quantity, task time, etc.) and personnel related to various types of accidents.

[0054] The present invention can comprehensively, timely and accurately display the relevant case information content that meets the needs of users. The present invention has a case analysis function and can quickly, accurately and effectively give analysis and evaluation conclusions. The present invention can promptly respond to the operation interruption request made by the user, promptly feedback the operation errors and anomalies, and can automatically restore to the initial default state.

[0055] The present invention can realize targeted analysis and evaluation of emergency protection measures for different elements of the evaluation target, such as various components of relevant measures (such as resource type, quantity, task time, etc.), personnel related to various types of accidents, etc. The present invention can complete the dosage evaluation and analysis function of the corresponding countermeasures or measures within the time specified by the system, and obtain accurate analysis results. The modules of the present invention are scientifically designed and implemented, and operate in efficient and coordinated manner without preemption, freezing or downtime. If an abnormality or error occurs, the user can be effectively prompted through reasonable error information, and the initial state of each module and subsystem is automatically restored without affecting the effective operation of other subsystems. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0057] Figure 1 It is a schematic diagram of the structure of a nuclear accident emergency countermeasures evaluation system provided by an embodiment of the present invention;

[0058] In the figure: 1. Emergency protection measures evaluation module; 2. Accident emergency decision-making optimization module; 3. Storage module; 4. Emergency rescue action measurement module; 11. Environmental data acquisition unit; 12. Data extraction unit; 13. Effectiveness parameter determination unit; 14. Path setting unit; 15. Evaluation unit; 21. Preventable dose calculation unit; 22. Protection countermeasures generation unit; 23. Optimization unit.

[0059] Figure 2 It is a flow chart of a nuclear accident emergency countermeasures evaluation method provided by an embodiment of the present invention.

[0060] Figure 3It is a flow chart of a method for obtaining the maximum possible on-site residence time and the cumulative dose of the on-site residence provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0062] In view of the problems existing in the prior art, the present invention provides a nuclear accident emergency response evaluation system, which is described in detail below in conjunction with the accompanying drawings.

[0063] like Figure 1 As shown, the nuclear accident emergency response evaluation system provided by the embodiment of the present invention includes:

[0064] Emergency protection measures evaluation module 1 is used to obtain protection measures plans and conduct targeted emergency protection measures analysis and evaluation based on different elements of the evaluation target;

[0065] Accident emergency decision optimization module 2 is used to perform optimal analysis, evaluation and calculation of countermeasure actions based on specific accident consequences, interface requirements, data formats and overall task requirements;

[0066] Storage module 3, used to store the relevant results obtained and calculated;

[0067] The emergency rescue action determination module 4 is used to verify the generated optimal emergency rescue action plan.

[0068] The emergency protection measures evaluation module 1 provided in the embodiment of the present invention includes:

[0069] An environmental data acquisition unit 11 is used to acquire radioactive material concentration field and radiation field data;

[0070] A data extraction unit 12 is used to extract the accident operation personnel protection equipment information and the task time and task path data from the protection measures plan;

[0071] An effectiveness parameter determination unit 13, for generating possible protective effectiveness parameters of the protective equipment based on the extracted protective equipment information;

[0072] A path setting unit 14, used for performing path setting;

[0073] The evaluation unit 15 is used to generate a protection effectiveness evaluation strategy evaluation result based on the acquired radioactive material concentration field and radiation field data, task time, and task path data according to the set multiple paths.

[0074] The operating personnel protection equipment information provided by the embodiment of the present invention includes external radiation protection facilities and internal radiation protection equipment information.

[0075] The accident emergency decision optimization module 2 provided in the embodiment of the present invention includes:

[0076] The preventable dose calculation unit 21 is used to calculate the expected dose and the preventable dose for the early radiation protection measures to be adopted for different personnel based on the upstream meteorological data and the dose field analysis data;

[0077] A protection countermeasure generation unit 22 is used to prioritize radiation protection measures based on the protection effectiveness evaluation strategy evaluation results and the calculated expected dose and preventable dose, and to generate radiation protection countermeasures for emergency workers respectively;

[0078] The optimization unit 23 is used to evaluate and optimize the generated protection countermeasures and emergency rescue action plan, and output the optimal emergency rescue action plan.

[0079] The emergency rescue action plan provided by the embodiment of the present invention includes: an entry path, a start time of entry, an evacuation path and on-site protection parameters.

[0080] like Figure 2 As shown, the nuclear accident emergency countermeasures evaluation method provided by the embodiment of the present invention includes the following steps:

[0081] S101, obtain the protection measures plan, and conduct targeted emergency protection measures analysis and evaluation for different elements of the evaluation target;

[0082] S102, based on the specific accident consequences, interface requirements, data format and overall mission requirements, perform optimization analysis and evaluation calculations on countermeasure actions to generate the optimal emergency rescue action plan;

[0083] S103, verifying the generated optimal emergency rescue action plan.

[0084] In step S102, the embodiment of the present invention provides an optimization analysis and evaluation calculation of countermeasure actions according to specific accident consequences, interface requirements, data formats and overall task requirements, and generates an optimal emergency rescue action plan, including:

[0085] Based on upstream meteorological data and dose field analysis data, the expected dose and preventable dose are calculated for the early radiation protection measures to be adopted for different personnel; the radiation protection measures are prioritized based on the evaluation results of the protection effectiveness evaluation strategy and the calculated expected dose and preventable dose, and radiation protection countermeasures are generated for emergency workers respectively; the generated protection countermeasures and emergency rescue action plans are evaluated and optimized, and the optimal emergency rescue action plan is output.

[0086] The optimization of the generated emergency rescue action plan provided by the embodiment of the present invention includes:

[0087] Based on the specific values ​​of the accident consequences and the selected paths, time points and other parameters, the path information is extracted, and different time slices and sections are divided and combined in combination with the specific path conditions to construct the sample space to be optimized. The time slices are iterated and screened based on the analysis results of the emergency protection measures, and the optimization results are determined by comparing the grid structure of the area to be optimized and the specified relevant time points.

[0088] The optimization of the generated emergency rescue action plan provided by the embodiment of the present invention also includes: optimizing the action decision, path suggestion, and entry time of the generated emergency rescue action plan.

[0089] The evaluation of the generated emergency rescue action plan provided in the embodiment of the present invention includes: calculating the cumulative doses of the entry path, on-site stay and evacuation path stages respectively, and by adjusting the length of stay on the scene, on the premise that the total cumulative dose does not exceed the personal cumulative dose limit, calculating the maximum personal residual dose on the scene under the emergency rescue action plan, and using it as a reference for the dose threshold of the emergency rescue action plan in on-site operation.

[0090] The embodiment of the present invention provides the following steps of evaluating and optimizing the generated emergency rescue action plan and outputting the optimal emergency rescue action plan:

[0091] (1) Obtain the entry path and evacuation path of each emergency rescue action plan respectively, and divide the entry path and evacuation path into a continuous set of small sections according to the grid size; at the same time, refer to the latitude and longitude coordinates of the incident site and the grid coordinates to map each path point to the closest grid point on the grid according to the latitude and longitude coordinates;

[0092] (2) Calculate the cumulative dose on each path for each emergency rescue action plan, iteratively calculate the cumulative dose of on-site stay and the cumulative dose on the evacuation path, and obtain the maximum possible on-site stay time and cumulative dose on-site stay, provided that the total cumulative dose of the protection plan does not exceed the personal cumulative dose limit;

[0093] (3) Sort each emergency rescue action plan according to the cumulative dose at the scene, and obtain the best emergency rescue action plan from the perspective of cumulative dose.

[0094] The total cumulative dose of the protection scheme provided by the embodiment of the present invention is the sum of the cumulative dose of the entry path, the cumulative dose of the on-site stay, and the cumulative dose of the evacuation path.

[0095] like Figure 3As shown, the method of obtaining the maximum possible on-site residence time and the cumulative dose of on-site residence provided by the embodiment of the present invention includes:

[0096] Calculate the cumulative dose of the entry path, obtain the specific time of arrival at the scene, and calculate the cumulative dose of the evacuation path according to the evacuation route and time; measure the relative size of the individual cumulative dose limit according to the corresponding cumulative doses of the entry route, evacuation route, and on-site stay; and iterate the calculation of the stay time based on the comparison results:

[0097] When the dose is below the dose limit, increase the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0098] When the dose exceeds the limit, reduce the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0099] It is sufficient when the result compared with the personal dose limit is basically close to (not higher than) and the difference is lower than the set threshold.

[0100] The formula for calculating the cumulative dose of a road section provided by the embodiment of the present invention is as follows:

[0101] Cumulative dose of the path = ∑(cloud concentration of sub-section i × residence time on sub-section i × cloud dose conversion factor × plume external radiation shielding factor + cloud concentration of sub-section i × residence time on sub-section i × accumulated dose conversion factor × inhalation protection factor + (ground dry deposition concentration of sub-section i + ground wet deposition concentration of sub-section i) × residence time on sub-section i × ground external radiation dose rate conversion factor × ground external radiation shielding factor);

[0102] Among them, the smoke cloud dose conversion factor, the accumulated dose conversion factor, and the ground external exposure dose rate conversion factor are all dose conversion factors for the whole body; the smoke plume external exposure shielding factor and the ground external exposure shielding factor are the external exposure protection factors of the current section, and the inhalation protection factor is the internal exposure protection factor of the section; the smoke cloud concentration, ground dry deposition concentration, and ground wet deposition concentration of the sub-section i are all read from the concentration field result file.

[0103] The technical effects of the present invention are further described below in conjunction with specific embodiments.

[0104] Embodiment 1:

[0105] The accident emergency decision optimization function module realizes the optimal analysis, evaluation and calculation of countermeasure actions according to specific accident consequences, interface requirements, data format and overall task requirements. It mainly includes two functions:

[0106] 1) Retrieve the results of upstream meteorological analysis and dose field analysis modules, present the relevant results of expected dose and preventable dose for the early radiation protection measures to be adopted by different personnel, and prioritize the radiation protection measures according to the analysis results of the early emergency protection measures module. Generate radiation protection countermeasures for emergency workers according to the results of the upstream analysis module, provide decision support, and complete the storage of result information.

[0107] 2) Taking the specific values ​​of accident consequences and parameters such as the selected paths and time points as input, the path information is extracted through the input data, and different time slices and sections are divided and combined according to the specific path conditions to construct the sample space to be optimized. On this basis, the upstream analysis module is called to analyze the specific input content, and the time slices are iterated and screened according to the analysis results, so as to determine the optimization results, such as time points (entry and exit), path selection and corresponding consequence values, by comparing the grid structure of the area to be optimized and the specified relevant time points.

[0108] As a subsystem of the nuclear accident emergency rescue operation platform, this functional module follows the unified installation, deployment and data interaction methods of the platform. The entire platform system is deployed on the internal LAN and isolated from the external network. Each subsystem communicates with the platform through TCP Socket, and uploads and downloads files through the FTP file server to achieve data file storage and sharing.

[0109] An emergency rescue action plan includes the following elements:

[0110] Access path

[0111] Start entering the moment

[0112] Evacuation route

[0113] On-site protection parameters, etc.

[0114] The evaluation of the emergency rescue action plan is to calculate the cumulative doses of the entry path, on-site stay and evacuation path stages respectively. By adjusting the length of stay on the scene, on the premise that the total cumulative dose does not exceed the personal cumulative dose limit, the maximum personal residual dose on the scene under the action plan is obtained, which serves as a reference for the dose threshold of the action plan in on-site operation.

[0115] The main steps include:

[0116] In the evaluation preparation stage, the entry and exit paths of the scheme are segmented into a set of continuous small sections according to the grid size, so as to obtain the concentration value on the section more accurately.

[0117] After the path segmentation is completed, the path points on each road section are still longitude and latitude coordinates. In order to obtain the concentration value of each point, each path point needs to be mapped to the closest grid point on the grid according to the longitude and latitude coordinates. This process needs to refer to the longitude and latitude coordinates of the incident site and the grid coordinates (the default is the grid center point (50, 50));

[0118] After completing the above path segmentation and mapping conversion of path points, the cumulative dose on each path can be calculated. When the path has been determined, the cumulative dose result is also related to the concentration value of the path point passed at that time, because the speed of passing each section on the path is determined, and the real-time concentration value of the path point is related to the moment of entering the path, which will affect the moment of passing each path point later.

[0119] For a specific action plan, the entry path and the start time of entry are determined, so the cumulative dose on the entry path is determined; the variable of the entire plan lies in the length of stay at the scene, from which the cumulative dose on the scene is deduced, and the stay time on the scene will also affect the start time of the evacuation path, thereby affecting the cumulative dose on the evacuation path.

[0120] It is necessary to adjust the length of stay on site, iteratively calculate the cumulative dose of the on-site stay and the cumulative dose on the evacuation path, and obtain the maximum possible on-site stay time and cumulative dose on site, under the premise that the total cumulative dose (entry path + on-site stay + evacuation path) does not exceed the personal cumulative dose limit.

[0121] When all the emergency rescue action plans to be evaluated have been analyzed, the various action plans can be sorted according to the cumulative dose of staying on site to obtain the best action plan from the perspective of cumulative dose.

[0122] Calculation of cumulative dose on road section:

[0123] Both the entry path and the exit path are composed of a series of road segments connected in sequence by path points. Calculating the cumulative dose of the entry path or the exit path is converted into calculating the cumulative dose on these road segments. Adding up the cumulative doses on all road segments gives the cumulative dose on the entire entry path or the exit path.

[0124] After the above path segmentation and path point mapping operations, the initial segment is split into a series of sub-segments close to the grid spacing, so as to more accurately obtain the average concentration value on each sub-segment, and thus more accurately calculate the cumulative dose of the initial segment. For all sub-segments of an initial segment, the following parameters are inherited from the initial segment:

[0125] Internal and external radiation protection factors;

[0126] Mode of action;

[0127] Layer height parameters;

[0128] The cumulative dose consists of three parts: external exposure from the smoke plume during the operation, external exposure from ground deposition, and internal exposure from inhalation.

[0129] Factors that affect the cumulative dose (residual dose) on a certain road section include:

[0130] The concentration values ​​of (smoke, dry ground deposition, and wet ground deposition) at the entry points of each sub-section during the time period;

[0131] The dwell time on each sub-segment;

[0132] the internal and external radiation protection factors on the road section;

[0133] Dose conversion factors for whole body from plume external exposure, ground deposition external exposure, and inhalation internal exposure;

[0134] The cumulative dose calculation process on the road section can be described by the following formula:

[0135] The cumulative dose of the road section = ∑ (the smoke cloud concentration of sub-section i × the residence time on sub-section i × the smoke cloud dose conversion factor × the smoke plume external radiation shielding factor + the smoke cloud concentration of sub-section i × the residence time on sub-section i × the accumulated dose conversion factor × the inhalation protection factor + (the ground dry deposition concentration of sub-section i + the ground wet deposition concentration of sub-section i) × the residence time on sub-section i × the ground external radiation dose rate conversion factor × the ground external radiation shielding factor)

[0136] Among them, the smoke cloud dose conversion factor, the accumulated dose conversion factor, and the ground external radiation dose rate conversion factor are all dose conversion factors for the "whole body". The smoke plume external radiation shielding factor and the ground external radiation shielding factor are the external radiation protection factors of the road section, and the inhalation protection factor is the internal radiation protection factor of the road section.

[0137] The smoke cloud concentration, ground dry deposition concentration, and ground wet deposition concentration of sub-section i are all read from the concentration field result file. Since the concentration field result file is the concentration data stored according to time slices, take the data containing a time slice at every hour for three consecutive days, a total of 72 time slices as an example (the time slice and resolution of the concentration field result file can be adjusted and set according to the actual application requirements), considering the residence time of each sub-section, it is necessary to map this small period of time into the time slice sequence, find the time slice closest to this period of residence time before this time period, and take the concentration at this slice as the concentration value of the sub-section. If the residence time of the sub-section spans multiple time slices, it is necessary to consider the residence time in each time slice, and perform separate dose calculation and accumulation for each time slice passed.

[0138] External radiation from ground fallout is considered only when the action is near the ground. External radiation from ground fallout is not considered if the action is near the water surface or in the air. (The dose calculation for underwater actions is not currently being conducted.)

[0139] Because the required concentration value is read from the concentration field result file, and the concentration field result file usually only stores the concentration data of the time slice of 72 hours for three consecutive days, if the residence time on the path exceeds the range of the concentration field time slice, the dose calculation cannot be performed by the above method. Considering the actual situation, the concentration of smoke and ground deposition for more than three days should have dropped to a very low concentration level, and the main dose contribution after that comes from the dose generated by decay. The above formula needs to be calculated for each nuclide separately, and finally the calculation results of each nuclide are added to get the total dose value.

[0140] Embodiment 2:

[0141] Prerequisites

[0142] A complete test case, add the test case and start analysis command in server_simulate.py, and store the case definition input file and atmospheric concentration field result file in the FTP path specified in the start analysis command.

[0143] Test objectives:

[0144] The result file generated by the emergency rescue action module is as expected. The optimization evaluation results of the emergency rescue action plan will be saved in a file called <taskid>.json special case output file, which also saves the action radius calculation results of each protection action plan of the public protection module.

[0145] The result file also contains a calculation completion flag field, which is set to true if the calculation completed successfully and false if the calculation was aborted.

[0146] Prerequisites:

[0147] A complete test case, add the test case and start analysis command in server_simulate.py, and store the case definition input file and atmospheric concentration field result file in the FTP path specified in the start analysis command.

[0148] step:

[0149] Start socket_communication.py to listen for calculation requests, and start server_simulate.py to listen for return messages;

[0150] Set taskContent in the start analysis command to 0 or 1 to support the calculation of the emergency rescue action module, send the start analysis command, start the calculation and wait for the calculation to complete;

[0151] Check the generated case result files to see if the calculation result format of each emergency rescue action plan meets the specifications;

[0152] If public protection actions are calculated at the same time, the action radius calculation results of the public protection action plan will also be included in this file;

[0153] When the calculation is terminated during the calculation process, all the public protection action plans and emergency action plans that have been calculated will be recorded in the result file and uploaded to FTP, and the calculation completion flag "outJudgement" will be set to false.

[0154] Expected results:

[0155] The emergency rescue action module can calculate and generate the specified result file. In the above cases, verify that the file format is correct and the content is complete. Test that the priority order of the solutions in the result file calculated and generated by the emergency rescue action module meets the design requirements.

[0156] The calculation results of the emergency rescue action plan are as follows:

[0157] -1: Stay at the accident center for 48 hours cumulatively and still not reach the limit

[0158] -2: The concentration value at the accident center is 0

[0159] 0: After staying at the accident center for a period of time, it is possible to reach the limit value

[0160] -3: Staying at the center of the accident for a very short time (less than 1 minute) will exceed the limit

[0161] -4: The limit will be exceeded on the entry path

[0162] In the case output result file, all the emergency rescue action plans that have been evaluated will be arranged in the above order.

[0163] For solutions with the same status code,

[0164] -1: Sort by "limit remaining" from large to small;

[0165] -2: Sort by "remaining dose" on the entry path from small to large;

[0166] 0: Sort by "remaining dose on site" from large to small;

[0167] -3: Sort by "remaining dose" within 1 minute at the accident center point from small to large;

[0168] -4: Sort by "remaining dose" on the entry path from small to large;

[0169] step:

[0170] Start socket_communication.py to listen for calculation requests, and start server_simulate.py to listen for return messages;

[0171] Set taskContent in the start analysis command to 0 or 1 to support the calculation of the emergency rescue action module, send the start analysis command, start the calculation and wait for the calculation to complete;

[0172] Check the generated case result file to verify that the sorting format of the calculation results of the emergency rescue action plan meets the design requirements;

[0173] Calculate multiple different cases and verify that the calculation results of the emergency rescue action plan in the case output file meet the design requirements.

[0174] Embodiment 3:

[0175] like Figure 3 As shown in the figure, after the input conditions are given (the user selects the entry and exit paths), the specific workflow is as follows:

[0176] Calculate the cumulative dose along the entry path;

[0177] Get the exact time of arrival at the scene;

[0178] Calculate the cumulative dose along the evacuation route according to the evacuation route and time;

[0179] Measure the relative size of the individual cumulative dose limit based on the corresponding cumulative doses of the entry route, exit route, and on-site stay;

[0180] According to the comparison results, the residence time is iteratively calculated:

[0181] When the dose is below the dose limit, increase the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0182] When the dose exceeds the limit, reduce the on-site stay time and recalculate the cumulative dose of entry, exit and stay;

[0183] When the result compared with the personal dose limit is basically close (not higher) and the difference is lower than the set threshold, the optimization calculation is completed.

[0184] The specific output content is as follows:

[0185] Optimize recommended action decisions (taking iodine, hiding, evacuating, and related area scopes): provide information windows and prompt signs.

[0186] Optimize the recommended path (countermeasures and contingency plan index): provide information prompts and GIS coordinate information.

[0187] When optimization suggestions are entered: an information window and a prompt icon are displayed.

[0188] Quantitative evaluation results of personnel dose (remaining, expected, preventable): Provide information windows, prompt labels and graphs with the information required for display on the platform interface.

[0189] Comparison of multiple options: Provide numerical information of corresponding characteristic parameters and provide a platform interface for displaying relevant charts.

[0190] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.< / taskid>

Claims

1. A method for evaluating nuclear accident emergency response measures, characterized in that: The nuclear accident emergency response evaluation method comprises: Obtain protection measures plan, and conduct targeted emergency protection measures analysis and evaluation according to different elements of the evaluation target; According to the specific accident consequences, interface requirements, data format and overall mission requirements, we will conduct the optimization analysis, evaluation and calculation of countermeasure actions to generate the optimal emergency rescue action plan; Verify the generated optimal emergency rescue action plan; The step of evaluating and optimizing the generated emergency rescue action plan and outputting the optimal emergency rescue action plan comprises the following steps: (1) Obtain the entry path and evacuation path of each emergency rescue action plan respectively, and divide the entry path and evacuation path into a continuous set of small sections according to the grid size; at the same time, refer to the latitude and longitude coordinates of the incident site and the grid coordinates to map each path point to the closest grid point on the grid according to the latitude and longitude coordinates; (2) Calculate the cumulative dose on each path for each emergency rescue action plan, iteratively calculate the cumulative dose of on-site stay and the cumulative dose on the evacuation path, and obtain the maximum possible on-site stay time and cumulative dose on-site stay, provided that the total cumulative dose of the protection plan does not exceed the personal cumulative dose limit; (3) Sort each emergency rescue action plan according to the cumulative dose at the scene, and obtain the best emergency rescue action plan from the perspective of cumulative dose; The step (2) comprises: Calculate the cumulative dose of the entry path, obtain the specific time of arrival at the scene, and calculate the cumulative dose of the evacuation path according to the evacuation route and time; measure the relative size of the individual cumulative dose limit according to the corresponding cumulative doses of the entry route, evacuation route, and on-site stay; and iterate the calculation of the stay time based on the comparison results: When the dose is below the dose limit, increase the on-site stay time and recalculate the cumulative dose of entry, exit and stay; When the dose exceeds the limit, reduce the on-site stay time and recalculate the cumulative dose of entry, exit and stay; When the comparison result with the personal dose limit is basically close and the difference is lower than the set threshold, it is OK; The calculation formula of path cumulative dose is as follows: Cumulative dose of the path = ∑ (cloud concentration of sub-section i × residence time on sub-section i × cloud dose conversion factor × plume external radiation shielding factor + cloud concentration of sub-section i × residence time on sub-section i × accumulated dose conversion factor × inhalation protection factor + (ground dry deposition concentration of sub-section i + ground wet deposition concentration of sub-section i) × residence time on sub-section i × ground external radiation dose rate conversion factor × ground external radiation shielding factor); Among them, the smoke cloud dose conversion factor, the accumulated dose conversion factor, and the ground external radiation dose rate conversion factor are all dose conversion factors for the whole body; the smoke plume external radiation shielding factor and the ground external radiation shielding factor are the external radiation protection factors of the current sub-section, and the inhalation protection factor is the internal radiation protection factor of the sub-section; the smoke cloud concentration, ground dry deposition concentration, and ground wet deposition concentration of the sub-section i are all read from the concentration field result file; The optimization analysis, evaluation and calculation of countermeasure actions based on specific accident consequences, interface requirements, data formats and overall mission requirements to generate the optimal emergency rescue action plan includes: Based on upstream meteorological data and dose field analysis data, the expected dose and preventable dose are calculated for the early radiation protection measures to be adopted by different personnel; the radiation protection measures are prioritized based on the evaluation results of the protection effectiveness evaluation strategy and the calculated expected dose and preventable dose, and radiation protection countermeasures for emergency workers are generated respectively; the generated protection countermeasures and emergency rescue action plans are evaluated and optimized, and the optimal emergency rescue action plan is output; The optimization of the generated emergency rescue action plan includes: Based on the specific values ​​of accident consequences and the selected paths, time points and other parameters, the path information is extracted, and different time slices and sections are divided and combined according to the specific path conditions to construct the sample space to be optimized. The time slices are iterated and screened based on the analysis results of emergency protection measures, and the grid structure of the area to be optimized and the specified relevant time points are compared to determine the optimization results; The optimizing of the generated emergency rescue action plan also includes: optimizing action decision, path suggestion and entry time of the generated emergency rescue action plan.

2. The nuclear accident emergency response evaluation method according to claim 1, characterized in that: The evaluation of the generated emergency rescue action plan includes: calculating the cumulative doses of the entry path, on-site stay and evacuation path stages respectively, and by adjusting the length of stay on the scene, on the premise that the total cumulative dose does not exceed the personal cumulative dose limit, calculating the maximum personal residual dose on the scene under the emergency rescue action plan, and using it as a reference for the dose threshold of the emergency rescue action plan in on-site operation.

3. The nuclear accident emergency response evaluation method according to claim 2, characterized in that: The total cumulative dose of the protection scheme is the sum of the cumulative dose of the entry path, the cumulative dose of the on-site stay, and the cumulative dose of the evacuation path.

4. A nuclear accident emergency response evaluation system for implementing the nuclear accident emergency response evaluation method according to any one of claims 1 to 3, characterized in that: The nuclear accident emergency response evaluation system comprises: The emergency protection measures evaluation module is used to obtain the protection measures plan and conduct targeted emergency protection measures analysis and evaluation based on different elements of the evaluation target; The accident emergency decision optimization module is used to perform the optimization analysis, evaluation and calculation of countermeasure actions according to specific accident consequences, interface requirements, data formats and overall task requirements; A storage module, used to store the relevant results obtained and calculated; The emergency rescue action determination module is used to verify the generated optimal emergency rescue action plan.

5. The nuclear accident emergency response evaluation system according to claim 4, characterized in that: The emergency protection measures evaluation module includes: Environmental data acquisition unit, used to acquire radioactive material concentration field and radiation field data; A data extraction unit, used to extract the protective equipment information of the accident operation personnel and the task time and task path data from the protection measures plan; an effectiveness parameter determination unit, for generating a protective effectiveness parameter of the protective equipment based on the extracted protective equipment information; A path setting unit, used for setting a path; An evaluation unit, for generating an evaluation result of a protection effectiveness evaluation strategy based on the acquired radioactive material concentration field and radiation field data, task time, and task path data according to the set multiple paths; The operator protection equipment information includes external radiation protection facilities and internal radiation protection equipment information; The accident emergency decision optimization module includes: The preventable dose calculation unit is used to calculate the expected dose and preventable dose for the early radiation protection measures to be adopted for different personnel based on the upstream meteorological data and dose field analysis data; A protection countermeasure generation unit is used to prioritize radiation protection measures based on the evaluation results of the protection effectiveness evaluation strategy and the calculated expected dose and preventable dose, and to generate radiation protection countermeasures for emergency workers respectively; The optimization unit is used to evaluate and optimize the generated protection countermeasures and emergency rescue action plans, and output the optimal emergency rescue action plan; The emergency rescue action plan includes: entry path, entry start time, evacuation path and on-site protection parameters.

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