CN113393014A - Method and device for dividing nuclear power plant smoke plume emergency plan zone - Google Patents
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Abstract
The invention discloses a method and a device for dividing a nuclear power plant smoke plume emergency plan zone, wherein the method comprises the following steps: 1) establishing a simulation area by taking a nuclear power plant as a center; 2) sampling time-by-time meteorological conditions aiming at a preset position to obtain meteorological data, and calculating dosage results of all release types under all time-by-time meteorological sampling conditions by adopting probability source items given by secondary probability safety analysis; 3) obtaining source items by combining the occurrence frequency of each source item release class, and then calculating to obtain a weighted dose result; 4) obtaining the change of the frequency exceeding the specified dosage along with the dosage, and combining the specified dosage limit value to obtain the frequency exceeding the specified dosage limit value; 5) obtaining the frequency that all preset positions exceed the specified dosage limit value; 6) and determining the range of the smoke plume emergency plan area by combining the specified frequency limit value. The device and the method provided by the invention are reasonable in design for the smoke plume emergency plan zone, and lay a technical foundation for the development of the three-level probability safety analysis work of the nuclear power plant.
Description
Technical Field
The invention belongs to the technical field of safety analysis of nuclear power plants, and particularly relates to a method and a device for dividing a smoke plume emergency plan zone of a nuclear power plant.
Background
The emergency plan area is an area which is established around the nuclear power station in advance, makes an emergency plan and is ready for emergency so that a protection action for protecting the public can be effectively taken in time when an accident occurs in the nuclear power station. Once a nuclear accident occurs, emergency preparation needs to be carried out in an emergency planning area, and effective emergency response actions can be conveniently and rapidly organized under the condition of emergency intervention, so that the possible influence of the accident on the public and the environment is reduced to the maximum extent. The smoke plume emergency planning region is an emergency planning region established aiming at a radioactive smoke plume irradiation way under the condition of a nuclear power station accident, and the main influence factor is airborne radioactivity release in the early stage of the accident. The research of the smoke plume emergency planning zoning is of great significance in scientifically making the appropriate size of the smoke plume emergency planning zone and relating to fund for emergency planning and preparation, risk, difficulty and cost brought by executing various emergency protective measures and whether public safety can be effectively protected.
In the traditional nuclear power plant smoke plume emergency planning region division design, only a single determination source item is adopted, and some accidents with smaller accident occurrence probability but more serious consequences are not considered, so that the nuclear power plant smoke plume emergency planning region division design is possibly unreasonable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for dividing a nuclear power plant smoke plume emergency plan zone aiming at the defects in the prior art, which have reasonable design on the nuclear power plant smoke plume emergency plan zone and lay a technical foundation for developing the three-level probability safety analysis work of a nuclear power plant.
The technical scheme adopted for solving the technical problem of the invention is to provide a division method for a nuclear power plant smoke plume emergency plan zone, which comprises the following steps:
1) establishing a simulation area in an area range within a preset distance from a nuclear power plant by taking the nuclear power plant as a center, wherein the simulation area consists of a plurality of preset positions;
2) sampling time-by-time meteorological conditions in preset time of a nuclear power plant aiming at a preset position in a simulation area to obtain meteorological data, adopting probability source items given by secondary probability safety analysis, and calculating dosage results of all release types under all time-by-time meteorological sampling conditions of the preset position aiming at each secondary probability safety analysis source item release type;
3) combining the dose result with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result weighted by the occurrence frequency of all secondary probability safety analysis source item release classes at the preset position;
4) sequencing all dosage results of the preset positions from large to small so as to obtain the change of the frequency of exceeding the specified dosage at the preset positions along with the dosage, and obtaining the frequency of exceeding the specified dosage at the preset positions by combining with the specified dosage limit;
5) repeating the steps 2), 3) and 4) to obtain the frequency of all preset positions in the simulation area exceeding the specified dose limit value;
6) and combining the frequencies of all preset positions in the simulation area exceeding the specified dose limit value with the specified frequency limit value to determine the smoke plume emergency plan area range of the nuclear power plant.
Preferably, the chronological meteorological conditions within the preset time refers to the meteorological conditions monitored once every fixed interval within the preset time, and include: any one or more of wind direction, wind speed, stability and precipitation.
Preferably, the calculation formula of the dose result obtained in step 3) after all secondary probability safety analysis source item release classes at the preset position are weighted according to the occurrence frequency is as follows:
wherein friAnalyzing the occurrence frequency of the source item release class for the ith secondary probability safety;
Di,j,kdose results for the kth preset position;
fri×Di,j,kanalyzing the source term fr for secondary probability safetyi×Di,j,k；
i is the ith source item release class of the secondary probability safety analysis, the range of i is 1-M, and M is a positive integer;
j is the jth meteorological sample, the range of j is 1-N, and N is a positive integer;
k is the kth preset position in the simulation area, the range of k is 1-P, and P is a positive integer.
Preferably, the specified dosage limits are those of existing regulatory standards.
Preferably, the specified frequency limit is 0.3.
The invention also provides a device used by the division method for the nuclear power plant smoke plume emergency plan zone, which comprises the following steps:
the modeling unit is used for establishing a simulation area within a preset distance from the nuclear power plant by taking the nuclear power plant as a center, and the simulation area consists of a plurality of preset positions;
the sampling unit is used for sampling the hourly meteorological conditions in the preset time of the nuclear power plant aiming at a preset position in the simulation area established by the modeling unit to obtain meteorological data;
the first calculation unit is used for calculating dosage results of all release classes under all time-by-time meteorological sampling conditions at the preset position aiming at each secondary probability safety analysis source item release class by adopting probability theory source items given by secondary probability safety analysis according to the meteorological data obtained by the sampling unit;
the second calculation unit is used for combining the dose result obtained by the first calculation unit with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result obtained by weighting all secondary probability safety analysis source item release classes at the preset position according to the occurrence frequency;
the frequency acquisition unit is used for sequencing all the dosage results of the preset positions obtained by the second calculation unit from large to small so as to obtain the frequency of the preset positions exceeding the specified dosage along with the change of the dosage, and the frequency of the preset positions exceeding the specified dosage limit is obtained by combining the specified dosage limit, and the frequency acquisition unit is also used for acquiring the frequency of all the preset positions in the simulation area exceeding the specified dosage limit;
and the emergency planning zone dividing unit is used for combining the frequencies of all preset positions in the simulation area, which are obtained by the frequency obtaining unit and exceed the specified dosage limit value, with the specified frequency limit value to determine the smoke plume emergency planning zone range of the nuclear power plant.
Preferably, the chronological meteorological conditions within the preset time refers to the meteorological conditions monitored once every fixed interval within the preset time, and include: any one or more of wind direction, wind speed, stability and precipitation.
Preferably, the calculation formula of the dose result obtained by weighting all secondary probability safety analysis source item release classes according to the occurrence frequency of the release classes in the preset position by the second calculation unit is as follows:
wherein friAnalyzing the occurrence frequency of the source item release class for the ith secondary probability safety;
Di,j,kdose results for the kth preset position;
fri×Di,j,kanalyzing the source term fr for secondary probability safetyi×Di,j,k；
i is the ith source item release class of the secondary probability safety analysis, the range of i is 1-M, and M is a positive integer;
j is the jth meteorological sample, the range of j is 1-N, and N is a positive integer;
k is the kth preset position in the simulation area, the range of k is 1-P, and P is a positive integer.
Preferably, the specified dosage limits are those of existing regulatory standards.
Preferably, the specified frequency limit is 0.3.
According to the method and the device for dividing the nuclear power plant smoke plume emergency plan zone, the application of a probability theory method in the nuclear power plant smoke plume emergency plan zone division is considered for the first time, probability theory source items are considered, probability statistics analysis on hourly meteorological data is also included, the method and the device can be directly applied to division design and optimization of the nuclear power plant smoke plume emergency plan zone, accident sequences with different accident occurrence probabilities include accidents with small accident occurrence probability but serious consequences, the nuclear power plant smoke plume emergency plan zone division is reasonably designed, and a technical basis is laid for development of three-level probability safety analysis work of a nuclear power plant.
Drawings
Fig. 1 is a flowchart of a division method of a nuclear power plant smoke plume emergency plan zone in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of an apparatus used in a division method for a nuclear power plant smoke plume emergency plan zone in embodiments 1 and 2 of the present invention;
FIG. 3 is a flowchart of a division method for a nuclear power plant smoke plume emergency plan zone in embodiment 2 of the present invention;
FIG. 4 is a frequency-dose graph of the kth grid in example 2 of the present invention;
FIG. 5 is a graphical representation of the frequency of exceeding the prescribed dose limit of 10mSv in a Cartesian coordinate system in accordance with example 2 of the present invention;
FIG. 6 is a graphical representation of the frequency of exceeding the prescribed dose limit of 50mSv in a Cartesian coordinate system in accordance with example 2 of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
Example 1
As shown in fig. 1, the present embodiment provides a method for partitioning a nuclear power plant smoke plume emergency plan zone, including the following steps:
s101, with a nuclear power plant as a center, establishing a simulation area in an area range within a preset distance from the nuclear power plant, wherein the simulation area is composed of a plurality of preset positions;
s102, aiming at a preset position in a simulation area, sampling time-by-time meteorological conditions in preset time of a nuclear power plant to obtain meteorological data, adopting probability theory source items given by secondary probability safety analysis, aiming at each secondary probability safety analysis source item release class, and calculating dosage results of all release classes in all time-by-time meteorological sampling conditions of the preset position;
s103, combining the dose result with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result weighted by the occurrence frequency of all secondary probability safety analysis source item release classes at a preset position;
s104, sequencing all dosage results of the preset position from large to small so as to obtain the change of the frequency exceeding the specified dosage at the preset position along with the dosage, and obtaining the frequency exceeding the specified dosage limit at the preset position by combining with the specified dosage limit;
s105, repeating the steps 2), 3) and 4) if the frequency that all preset positions in the simulation area exceed the specified dose limit value is obtained, executing the step S106, otherwise, repeating the steps 2), 3) and 4);
and S106, combining the frequencies of all preset positions in the simulation area exceeding the specified dose limit value with the specified frequency limit value to determine the smoke plume emergency plan area range of the nuclear power plant.
As shown in fig. 2, the present embodiment further provides an apparatus for the division method for the nuclear power plant smoke plume emergency plan zone, including:
the modeling unit is used for establishing a simulation area within a preset distance from the nuclear power plant by taking the nuclear power plant as a center, and the simulation area consists of a plurality of preset positions;
the sampling unit is used for sampling the hourly meteorological conditions in the preset time of the nuclear power plant aiming at a preset position in the simulation area established by the modeling unit to obtain meteorological data;
the first calculation unit is used for calculating dosage results of all release classes under all time-by-time meteorological sampling conditions at the preset position aiming at each secondary probability safety analysis source item release class by adopting probability theory source items given by secondary probability safety analysis according to the meteorological data obtained by the sampling unit;
the second calculation unit is used for combining the dose result obtained by the first calculation unit with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result obtained by weighting all secondary probability safety analysis source item release classes at the preset position according to the occurrence frequency;
the frequency acquisition unit is used for sequencing all the dosage results of the preset positions obtained by the second calculation unit from large to small so as to obtain the frequency of the preset positions exceeding the specified dosage along with the change of the dosage, and the frequency of the preset positions exceeding the specified dosage limit is obtained by combining the specified dosage limit, and the frequency acquisition unit is also used for acquiring the frequency of all the preset positions in the simulation area exceeding the specified dosage limit;
and the emergency planning zone dividing unit is used for combining the frequencies of all preset positions in the simulation area, which are obtained by the frequency obtaining unit and exceed the specified dosage limit value, with the specified frequency limit value to determine the smoke plume emergency planning zone range of the nuclear power plant.
The method and the device for dividing the nuclear power plant smoke plume emergency plan area in the embodiment consider the application of the probability theory method in the nuclear power plant smoke plume emergency plan area division for the first time, not only consider the probability theory source item, but also include the probability statistical analysis of the hourly meteorological data, and can be directly applied to the division design and optimization of the nuclear power plant smoke plume emergency plan area, and the accident sequences with different accident occurrence probabilities, including the accidents with smaller accident occurrence probability but serious consequences, are reasonable in the design of the nuclear power plant smoke plume emergency plan area division, and lay a technical foundation for the development of the nuclear power plant three-level probability safety analysis work.
Example 2
As shown in fig. 3, the embodiment provides a method for partitioning a nuclear power plant smoke plume emergency plan zone, including the following steps:
s201, with a nuclear power plant as a center, establishing a simulation area in an area range within a preset distance from the nuclear power plant, wherein the simulation area is composed of a plurality of preset positions; specifically, in this embodiment, a grid with a preset resolution of 200m × 200m is established on a cartesian coordinate system with a nuclear power plant as a center, the simulation area is composed of a plurality of preset grids, the preset position is the preset grid, and the simulation area is 10km around the plant site of the nuclear power plant.
S202 is directed to a k-th preset grid in the simulation area from the nuclear power plant release source, that is, a k-th grid from the nuclear power plant release source.
S203, carrying out meteorological sampling on the jth group of meteorological abstract conditions in the hourly meteorological conditions in the preset time of the nuclear power plant, wherein preferably, the hourly meteorological conditions in the preset time refer to monitoring once every fixed interval time in the preset time, and the meteorological conditions comprise: any one or more of wind direction, wind speed, stability and precipitation. Specifically, the hourly meteorological conditions in the preset time in this embodiment are sampling meteorological conditions every 6 hours for 8760 hours in the last year. The meteorological conditions in this embodiment include: wind direction, wind speed, stability, precipitation. A total of 8760h/6h 1460 set of dose values for each release class.
S204, obtaining the jth group of meteorological data.
S205, probability source items given by the second-level probability safety analysis are adopted, and the probability source items given by the ith second-level Probability Safety Analysis (PSA) are used.
S206, the release amount of the release class of the probability source item given by the ith secondary Probability Safety Analysis (PSA) is obtained.
S207, combining S204 and S206, calculating a dose result D of the ith release class under the time-by-time meteorological sampling condition of the kth preset gridi,j,k。
S208, j ═ j +1, judging whether j is greater than N, if j is greater than N>N, calculating the dosage result D of the ith release class under all the time-by-time meteorological sampling conditions of the kth preset gridi,j,kThen, go to step S210; otherwise, repeating the steps S203-S207, wherein N is a positive integer.
S209 obtains the occurrence frequency fr of the ith secondary probability safety analysis source item release class through S205i。
S210, combining S208 and S209, calculating to obtain the ith secondary probability safety analysis source item fri×Di,j,k。
S211 wherein i ═i +1, judging whether i is greater than M, if i is greater than M>M, calculating all release class secondary probability safety analysis source items fr of the kth preset gridi×Di,j,kOtherwise, step S205 to S210 are repeated, where M is a positive integer.
S212, calculating to obtain a dose result of all secondary probability safety analysis source item release classes of the kth preset grid after weighting according to occurrence frequency of the release classes
S213, as shown in fig. 4, sorts all the dose results of the kth preset grid from large to small, thereby obtaining a schematic diagram of the frequency of exceeding the specified dose at the same preset grid k along with the change of the dose, in the diagram, for the same grid, the doses under different meteorological conditions can be obtained according to the annual meteorological sampling, and sorts all the doses from large to small, thereby giving each corresponding dose and the frequency of exceeding the specified dose. Where the abscissa represents dose and the ordinate represents frequency of over-dosing. For the sake of distinction, different colors and different squares merely represent a sequence of corresponding different weather conditions.
S214 dosage limit Dth. Preferably, the specified dosage limits are those of existing regulatory standards. Specifically, the dose limit value of the existing regulatory standard in this embodiment is the dose limit value given in appendix E of "basic standard for ionizing radiation protection and radiation source safety" of national regulatory standard GB 18871-2002.
S215, combining 213 and S214, obtaining the frequency f exceeding the appointed dose limit value at the k preset gridi。
S216, if k is equal to k +1, determining whether k is greater than P, and if k is greater than P, obtaining a frequency that all preset grids in the simulation region exceed the specified dose limit, then performing step S218; otherwise, the steps S202 to S215 are repeated, and P is a positive integer.
S217 specifies a frequency limit fth。
And S218, combining S216 and S217, determining the smoke plume emergency plan area range of the nuclear power plant. Namely, from the angle of combining the specified dose limit value and the specified frequency limit value, the smoke plume emergency planning area of the nuclear power plant is measured and calculated based on a probability theory method.
Preferably, the formula for calculating the dose result of all secondary probabilistic security analysis source item release classes weighted according to the occurrence frequency of the release classes of the kth preset grid is as follows:
wherein friFrequency of occurrence of source item release classes for the ith secondary Probabilistic Safety Analysis (PSA);
Di,j,kdose results for the kth preset grid;
fri×Di,j,kanalyzing the source term fr for secondary probability safetyi×Di,j,k；
i is the ith source item release class of the secondary probability safety analysis, the range of i is 1-M, and M is a positive integer;
j is the jth meteorological sample, the range of j is 1-N, and N is a positive integer;
k is the kth preset grid in the simulation area, the range of k is 1-P, and P is a positive integer.
In a specific embodiment, the 2-day effective dose not exceeding 10mSv is selected as the dose limit value of the outer boundary of the emergency planning area of the nuclear power plant smoke plume, and the frequency fi of the 2-day effective dose exceeding 10mSv at the grid can be obtained.
Preferably, the specified frequency limit is 0.3.
As shown in fig. 5, in detail, the method in this embodiment initially determines that the nuclear power plant smoke plume emergency plan area outer boundary is 10 km.
As shown in fig. 1, the present embodiment further provides an apparatus for the division method for the nuclear power plant smoke plume emergency plan zone, including:
the modeling unit is used for establishing a simulation area within a preset distance from the nuclear power plant by taking the nuclear power plant as a center, and the simulation area consists of a plurality of preset positions;
the sampling unit is used for sampling the hourly meteorological conditions in the preset time of the nuclear power plant aiming at a preset position in the simulation area established by the modeling unit to obtain meteorological data;
the first calculation unit is used for calculating dosage results of all release classes under all time-by-time meteorological sampling conditions at the preset position aiming at each secondary probability safety analysis source item release class by adopting probability theory source items given by secondary probability safety analysis according to the meteorological data obtained by the sampling unit;
the second calculation unit is used for combining the dose result obtained by the first calculation unit with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result obtained by weighting all secondary probability safety analysis source item release classes at the preset position according to the occurrence frequency;
the frequency acquisition unit is used for sequencing all the dosage results of the preset positions obtained by the second calculation unit from large to small so as to obtain the frequency of the preset positions exceeding the specified dosage along with the change of the dosage, and the frequency of the preset positions exceeding the specified dosage limit is obtained by combining the specified dosage limit, and the frequency acquisition unit is also used for acquiring the frequency of all the preset positions in the simulation area exceeding the specified dosage limit;
and the emergency planning zone dividing unit is used for combining the frequencies of all preset positions in the simulation area, which are obtained by the frequency obtaining unit and exceed the specified dosage limit value, with the specified frequency limit value to determine the smoke plume emergency planning zone range of the nuclear power plant.
The method and the device for dividing the nuclear power plant smoke plume emergency plan area in the embodiment consider the application of the probability theory method in the nuclear power plant smoke plume emergency plan area division for the first time, not only consider the source item of the probability theory, but also include the probability statistical analysis of the hourly meteorological data, can be directly applied to the division design and optimization of the nuclear power plant smoke plume emergency plan region, takes the accident sequences with different accident occurrence probabilities into consideration, including the accidents with smaller accident occurrence probability but serious consequences, namely, the probability theory source items given by the secondary probability safety analysis are adopted, and on the basis, the meteorological sampling method is adopted to carry out sampling analysis on the meteorological condition data time by time all the year around, and the smoke plume emergency plan area of the nuclear power plant is designed by combining the specified dose limit value and the specified frequency limit value, the design of the nuclear power plant smoke plume emergency plan zone is reasonable, and a technical foundation is laid for the development of the nuclear power plant three-level probability safety analysis work.
Example 3
The embodiment provides a method for dividing a nuclear power plant smoke plume emergency plan zone, which is different from the embodiment 2 in that:
as shown in FIG. 6, the effective dose of not more than 50mSv for 7 days is selected as the dose limit value of the outer boundary of the emergency planning area of the nuclear power plant smoke plume, and the frequency fi of the effective dose of more than 10mSv for 2 days at the grid can be obtained.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A method for dividing a nuclear power plant smoke plume emergency plan zone is characterized by comprising the following steps:
1) establishing a simulation area in an area range within a preset distance from a nuclear power plant by taking the nuclear power plant as a center, wherein the simulation area consists of a plurality of preset positions;
2) sampling time-by-time meteorological conditions in preset time of a nuclear power plant aiming at a preset position in a simulation area to obtain meteorological data, adopting probability source items given by secondary probability safety analysis, and calculating dosage results of all release types under all time-by-time meteorological sampling conditions of the preset position aiming at each secondary probability safety analysis source item release type;
3) combining the dose result with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result weighted by the occurrence frequency of all secondary probability safety analysis source item release classes at the preset position;
4) sequencing all dosage results of the preset positions from large to small so as to obtain the change of the frequency of exceeding the specified dosage at the preset positions along with the dosage, and obtaining the frequency of exceeding the specified dosage at the preset positions by combining with the specified dosage limit;
5) repeating the steps 2), 3) and 4) to obtain the frequency of all preset positions in the simulation area exceeding the specified dose limit value;
6) and combining the frequencies of all preset positions in the simulation area exceeding the specified dose limit value with the specified frequency limit value to determine the smoke plume emergency plan area range of the nuclear power plant.
2. The method for partitioning the nuclear power plant smoke plume emergency plan area according to claim 1, wherein the time-by-time meteorological conditions in the preset time refer to monitoring once every fixed interval in the preset time, and the meteorological conditions include: any one or more of wind direction, wind speed, stability and precipitation.
3. The method for partitioning the nuclear power plant smoke plume emergency plan zone according to claim 1, wherein the calculation formula of the dose result obtained in the step 3) after weighting all secondary probability safety analysis source item release classes of the preset position according to the occurrence frequency thereof is as follows:
wherein friAnalyzing the occurrence frequency of the source item release class for the ith secondary probability safety;
Di,j,kdose results for the kth preset position;
fri×Di,j,kanalyzing the source term fr for secondary probability safetyi×Di,j,k；
i is the ith source item release class of the secondary probability safety analysis, the range of i is 1-M, and M is a positive integer;
j is the jth meteorological sample, the range of j is 1-N, and N is a positive integer;
k is the kth preset position in the simulation area, the range of k is 1-P, and P is a positive integer.
4. The method for partitioning a nuclear power plant smoke plume emergency plan zone as claimed in claim 1, wherein the prescribed dose limit is a dose limit of an existing regulatory standard.
5. The method for partitioning a nuclear power plant smoke plume emergency plan zone as claimed in claim 1, wherein the specified frequency limit is 0.3.
6. An apparatus for the division method of the nuclear power plant smoke plume emergency plan zone according to any one of claims 1 to 5, comprising:
the modeling unit is used for establishing a simulation area within a preset distance from the nuclear power plant by taking the nuclear power plant as a center, and the simulation area consists of a plurality of preset positions;
the sampling unit is used for sampling the hourly meteorological conditions in the preset time of the nuclear power plant aiming at a preset position in the simulation area established by the modeling unit to obtain meteorological data;
the first calculation unit is used for calculating dosage results of all release classes under all time-by-time meteorological sampling conditions at the preset position aiming at each secondary probability safety analysis source item release class by adopting probability theory source items given by secondary probability safety analysis according to the meteorological data obtained by the sampling unit;
the second calculation unit is used for combining the dose result obtained by the first calculation unit with the occurrence frequency of each secondary probability safety analysis source item release class to obtain a secondary probability safety analysis source item, and then calculating to obtain a dose result obtained by weighting all secondary probability safety analysis source item release classes at the preset position according to the occurrence frequency;
the frequency acquisition unit is used for sequencing all the dosage results of the preset positions obtained by the second calculation unit from large to small so as to obtain the frequency of the preset positions exceeding the specified dosage along with the change of the dosage, and the frequency of the preset positions exceeding the specified dosage limit is obtained by combining the specified dosage limit, and the frequency acquisition unit is also used for acquiring the frequency of all the preset positions in the simulation area exceeding the specified dosage limit;
and the emergency planning zone dividing unit is used for combining the frequencies of all preset positions in the simulation area, which are obtained by the frequency obtaining unit and exceed the specified dosage limit value, with the specified frequency limit value to determine the smoke plume emergency planning zone range of the nuclear power plant.
7. The apparatus for partitioning a nuclear power plant smoke plume emergency plan area according to claim 6, wherein the time-by-time meteorological conditions in a preset time are monitored every fixed interval time in the preset time, and the meteorological conditions include: any one or more of wind direction, wind speed, stability and precipitation.
8. The device for the partition method of the nuclear power plant smoke plume emergency plan zone according to claim 6, wherein the second calculation unit obtains the dosage result of all secondary probability safety analysis source item release classes weighted according to the occurrence frequency of the release classes at the preset position by the following calculation formula:
wherein friAnalyzing the occurrence frequency of the source item release class for the ith secondary probability safety;
Di,j,kdose results for the kth preset position;
fri×Di,j,kanalyzing the source term fr for secondary probability safetyi×Di,j,k；
i is the ith source item release class of the secondary probability safety analysis, the range of i is 1-M, and M is a positive integer;
j is the jth meteorological sample, the range of j is 1-N, and N is a positive integer;
k is the kth preset position in the simulation area, the range of k is 1-P, and P is a positive integer.
9. The apparatus for use in the division method for a nuclear power plant smoke plume emergency plan zone of claim 6, wherein the prescribed dose limit is a dose limit of an existing regulatory standard.
10. The apparatus for the division method for the nuclear power plant smoke plume emergency plan area of claim 6, wherein the specified frequency limit is 0.3.
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