KR20150032040A - System for Assessing of Emergency Planning Zone in Nuclear Power Plant using probabilistic safety assessment result - Google Patents

Abstract

The present invention relates to a system for evaluating a radiological emergency planning zone in a nuclear power plant using a stochastic safety analysis result, and includes a core stock information collection device collecting information on core stock that may vary when the nuclear power plant operates; a stochastic safety analysis device performing risk analysis in real time by reflecting various variations that may be made when the nuclear power plant operates; a weather data collection device collecting weather data observed at specific time intervals in the nuclear power plant; a population data collection device collecting, at specific time intervals, data related to the distribution of population within 1 km to 80 km radius of the nuclear power plant; a off-site consequence analysis device extracting, for each point, a distance that an average external whole-body dose and an average child thyroid equivalent dose reach a reference dose, based on information collected through the core stock information collection device, the stochastic safety analysis device, the weather data collection device, and the population data collection device; and an effectiveness evaluation device determining how much the radiological emergency planning zone (EPZ) evaluated according to a result of analysis by the off-site consequence analysis device exceeds the current radiological EPZ actually set, calculating an effectiveness evaluation ratio (EER) and determining effectiveness according to the calculated evaluation ratio.

Description

[0001] The present invention relates to a radiation emergency planning zone evaluation system for a nuclear power plant using probabilistic safety analysis results,

The present invention relates to a nuclear radiation emergency planning zone evaluation system, and more particularly, to a system for evaluating the feasibility of an EPZ specified in a radiation emergency plan using a probabilistic safety analysis result (PSA) of a nuclear power plant .

The radiation emergency planning area was set up and operated within a range of about 8 to 10 km based on the reference dose used to make the necessary measures to reduce the distance from the nuclear power plant and the exposure of surrounding residents.

The basis for the establishment is that the EPZ, which is currently set in accordance with the external dose calculated using the deterministic method from the basic diffusion equation and the pediatric thyroid equivalent dose, conforms to the protection measure standard (external system dose 10mSv, pediatric thyroid equivalent dose 100mSv) Respectively.

In addition to the evaluation of the scope of radiation emergency plan area for Korean standard nuclear power plants, there are a number of other reports related to the evaluation of the radiation emergency plan area of nuclear power plants. However, conventional assessments, including prior literature, do not reflect the various accident scenarios that occur within a nuclear power plant and the probabilistic elements of the scenario.

Therefore, in order to evaluate the validity of the currently established emergency planning zone (EPZ) according to the change of the power plant, it is necessary to use a stochastic EPZ validation system and method An invention is required.

By appropriately evaluating the effectiveness of the emergency planning zone (EPZ) in accordance with the changes in the interior of the nuclear power plant (ie, changes in the core system, changes in the safety system for mitigation of accidents, , It is possible to prevent the loss of life and property due to nuclear accident.

Journal of Radiation Protection 28 (3) 215-223 0253-4231 KCI, 2003 (Name of Prior Art: Evaluation of Radiation Emergency Plan Area for Korean Standard Nuclear Power Plants).

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a safety analysis apparatus, a safety analysis apparatus, a nuclear power plant periodic weather data collection apparatus, The purpose of the present invention is to evaluate the effectiveness of the current emergency planning zone (EPZ) with respect to the present state of the power plant by using a device, etc., and to provide decision information on the necessity of changing the emergency planning zone (EPZ).

Considering the changes inside the nuclear power plant (ie, changes in the core system, changes in the safety system to mitigate accidents, changes in measures for managing major accidents, etc.) and external changes (weather, population, etc.) (EPZ), and accordingly decided to reevaluate / reduce / expand the EPZ, it was decided to carry out an effective contingency plan of the similar city nuclear power plant to prevent the loss of life and property due to the accident. The present invention has been made in view of the above problems.

In order to accomplish the above object, the present invention relates to a radiation emergency planning zone evaluation system of a nuclear power plant using a stochastic safety analysis result, and more particularly, to a reactor core inventory information collecting system for collecting information on core stocks, ; A probabilistic safety analysis system that performs real - time risk analysis by reflecting various changes that may occur in the operation of a nuclear power plant; A meteorological data collecting device for collecting meteorological data observed at a specific time interval in a nuclear power plant; A population data collecting device for collecting data related to the distribution of the population within a radius of 1 km to 80 km based on the nuclear power plant at specific time intervals; Based on the information collected through the core stock information collecting device, the stochastic safety analyzing device, the weather data collecting device and the population data collecting device, the average external system dose and the average child pediatric thyroid equivalent dose reach the reference dose An alienation analysis device for extracting each lot; (EPZ) evaluated according to the analysis result of the marginal analysis apparatus and the actual radiation emergency planning zone (EPZ), and calculates the effectiveness evaluation value (EER) , A validity evaluating device for judging validity in accordance with the calculated evaluation value; .

Further, the information collected and stored through the core stock quantity information collecting apparatus includes at least one of half-life, atomic mass, mass, radioactivity, and increase / decrease according to the nuclide.

Further, the information analyzed and stored through the probabilistic safety analysis apparatus includes at least one of an accident occurrence frequency, a major accident content, and a nuclear species release fraction according to an accident scenario.

In addition, the information collected and stored through the meteorological data collecting apparatus may include at least one of wind direction, wind speed, atmospheric stability, and precipitation amount according to the measurement time.

In addition, the information collected and stored through the population data collection device includes population distribution data by direction / distance.

Further, the information extracted and stored through the above-mentioned exclusion analysis apparatus is obtained by comparing the average external system dose for each orientation and each distance information for which the average equivalent child's thyroid equivalent dose reaches the reference dose, And evaluation distance information.

The validity evaluation apparatus generates a validity evaluation map, and calculates a final evaluation distance (C) extracted for each orientation with respect to the average external radiation dose and the equivalent pediatric thyroid equivalent dose according to the analysis result of the exclusion analysis apparatus A map display module for displaying the area corresponding to the current radiation emergency plan area (EPZ) on the validity evaluation map and displaying the current radiation emergency planning area (EPZ) on the validity evaluation map; An area calculation module for calculating an area according to a final evaluation distance (C) extracted for each orientation indicated in the validity evaluation map and an area of the current radiation emergency planning area (EPZ); (EER) as a ratio between the area of the current radiation emergency planning area (EPZ) calculated through the area calculation module and the area of the area (20) according to the final evaluation distance (C) A validity judgment module for judging validity according to the calculated evaluation value; And a control unit.

According to the present invention as described above, the EPZ effectiveness is appropriately evaluated according to changes in the inside of the nuclear power plant (i.e., changes in the core, changes in the safety system for mitigation of accidents, Effective emergency planning can prevent the loss of life and property due to nuclear accident.

1 is a schematic view showing a conceptual view of a radiation emergency planning zone evaluation system of a nuclear power plant using a stochastic safety analysis result according to the present invention.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
3 is a diagram showing an example of a probabilistic safety analysis result table according to the present invention.
FIG. 4 illustrates an example of a weather data storage table according to the present invention. FIG.
FIG. 5 illustrates an example of a population data storage table according to the present invention. FIG.
FIG. 6 is an exemplary diagram showing an alienated end result analysis table according to the present invention. FIG.
7 shows an example of a validity evaluation map for evaluating the effectiveness of the radiation emergency planning zone (EPZ) according to the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

1 to 7, a description will be made of an evaluation system for a radiation emergency planning zone of a nuclear power plant using a stochastic safety analysis result according to the present invention.

1 is a block diagram conceptually showing a radiation emergency planning zone evaluation system (S) of a nuclear power plant using a stochastic safety analysis result according to the present invention. As shown in the figure, the core stock information collecting apparatus 100, A safety analysis device 200, a meteorological data collection device 300, a population data collection device 400, an extraneous end result analysis device 500, and an effectiveness evaluation device 600.

The core stock quantity information collecting apparatus 100 collects and stores information on the core stock quantities that can be changed during the operation of the nuclear power plant such as the output increase and the long core core use.

At this time, the core stock storing table is as shown in FIG. 2, and includes information such as half life, atomic mass, mass, radioactivity, increase / decrease according to the nuclide.

The probabilistic safety analysis apparatus 200 performs risk analysis in real time by reflecting various changes that may occur in operation of a nuclear power plant and stores the results.

Here, various kinds of changes include design change information on installation of a new device and a channel, change of operation mode, capacity change, procedure change information on an operation procedure, emergency operation procedure, Change information of device reliability data regarding device failure rate, common cause failure, human error, and the like. In the real-time risk analysis, necessary data can be used in connection with the analysis of marginal consequences including the fraction of release of radioactive materials per accident scenario.

3, and the probabilistic safety analysis apparatus 200 calculates the probability of occurrence of the accident based on the accident occurrence frequency, major accident content, and nuclear fraction release rate Analyze.

The meteorological data collection device 300 collects and stores information such as the wind direction, wind speed, atmospheric stability, and precipitation observed at intervals of about 10 minutes from the meteorological tower of the nuclear power plant.

At this time, the collected weather data storage table is as shown in FIG. 4, and includes information such as wind direction, wind speed, atmospheric stability, and rainfall amount according to the measurement time.

The population data collection device (400) collects and stores the data related to the distribution of the population within a radius of 80 km based on the nuclear power plant at about one year intervals.

At this time, the collected population data storage table is as shown in FIG. 5, and includes information such as population distribution data by orientation / distance.

Based on the collected information through the core stock quantity information collecting apparatus 100, the stochastic safety analyzing apparatus 200, the meteorological data collecting apparatus 300 and the population data collecting apparatus 400, The average external systemic dose and the distance at which the average equivalent child's thyroid equivalent dose reaches the reference dose are extracted for each bearing and the result is stored.

Specifically, the exclusion analysis apparatus 500 extracts distances exceeding the reference dose (10 mSv) by increasing the distance (1 km, 2 km, 3 km, ...) (1km, 2km, 3km ...) and extracting distances exceeding the reference dose (100mSv) in the average childhood thyroid dose, recorded in the end result analysis table (A) Record the results of the neglected ending analysis in (B) of the table. Thereafter, (A) and (B) are compared with respect to each bearing, and the longer distance is extracted and recorded as the final evaluation distance in (C) of the alienated ending analysis result table (see FIG. 6).

On the other hand, the average external body dose is calculated by [Equation 1], and the average equivalent child thyroid equivalent dose is calculated by [Equation 2].

[Equation 1]

Average external body dose = Σ (scenario I frequency) ㅧ (scenario I external dose)

[Equation 2]

Average childhood thyroid equivalent dose = Σ (scenario I frequency) ㅧ (scenario I child thyroid equivalent dose)

At this time, the reference dose for external system dose and pediatric thyroid equivalent dose are 10 mSv and 100 mSv, respectively.

The effectiveness evaluation apparatus 600 determines whether the estimated radiation emergency planning area EPZ evaluated according to the analysis result of the marginal analysis apparatus 500 exceeds the actually set current radiation emergency planning area EPZ 1, the map display module 610, the area calculating module 620, and the validity determining unit 620. The map display module 610, the area calculating module 620, and the validity determining unit 620, as shown in FIG. 1, Module 630. < / RTI >

Specifically, the map display module 10 generates a validity evaluation map 10 as shown in FIG. 7, and calculates an average external radiation dose and an average pediatric thyroid dose according to the analysis result of the exclusion analysis device 500 The area 20 according to the final evaluation distance C extracted for each orientation with respect to the equivalent dose is displayed on the effectiveness evaluation map 10 and the current radiation emergency planning zone EPZ 30 is displayed on the validity evaluation map 10 ).

The area calculation module 620 calculates the area of the area 20 and the current radiation emergency planning area EPZ 30 according to the final evaluation distance C extracted for each orientation shown in the validity evaluation map 10.

The validity determination module 630 determines the area of the current radiation emergency planning area EPZ 30 calculated through the area calculation module 620 and the area 20 corresponding to the final evaluation distance C extracted for each orientation. (EER), and judges the validity based on the following [Table 1] based on the calculated evaluation value.

That is, the calculation of the EPZ effectiveness ratio (EER Effectiveness Ratio: EER) is as follows.

[Equation 1]

EER = (Width of the evaluated EPZ zone - Width of the current EPZ zone) / Width of the current EPZ zone * 100

EER Display judgment measure 0 green No problem EPZ reduction can be considered Less than 5% green caution No special changes below 10 yellow warning No special changes 20% or less Orange Danger Recalculation Less than 50% Red Change EPZ Long-term EPZ change required 100% or less Red Change EPZ Middle EPZ change required 100% or more Red Change EPZ Short-term EPZ change required

In the case of the existing radiation emergency planning area (EPZ), it is estimated that the currently set radiation emergency planning zone (EPZ) conforms to the protection measures according to the external dose calculated using the deterministic method from the basic diffusion formula and the equivalent dose of the child's thyroid Respectively. These assessments have the disadvantage of not being able to reflect the various changes that may occur during the operation of a nuclear power plant and the resulting changes in accident scenarios.

Therefore, in the present invention, it is necessary to periodically consider the changes in the nuclear power plant (that is, changes in the core system, changes in the safety system for mitigating accidents, changes in measures for managing major accidents, etc.) (EPZ) in accordance with the effectiveness of the Emergency Planning Plan (EPZ) and the reevaluation / reduction / expansion of the Emergency Planning Zone (EPZ) There is a distinctive advantage in that the loss of property can be prevented in advance.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

S: Evaluation system of radiation emergency plan area of nuclear power plant using probabilistic safety analysis result
100: core stock quantity information collecting apparatus 200: probabilistic safety analyzing apparatus
300: meteorological data collection device 400: population data collection device
500: Extraneous end result analysis apparatus 600: Effectiveness evaluation apparatus
610: map display module 620: width calculation module
630: Validation module

Claims (7)

A core stock quantity information collecting device (100) for collecting information on a core stock quantity which can be changed when operating a nuclear power plant;
A probabilistic safety analysis device 200 for performing a risk analysis in real time by reflecting various changes that may occur in operating a nuclear power plant;
A meteorological data collection device (300) for collecting meteorological data observed at a specific time interval in a nuclear power plant;
A population data collection device 400 for collecting data related to the distribution of the population within a radius of 1 km to 80 km based on the nuclear power plant at specific time intervals;
Based on the information collected through the core stock quantity information collecting apparatus 100, the probabilistic safety analyzing apparatus 200, the meteorological data collecting apparatus 300 and the population data collecting apparatus 400, an average external system dose, An alienation analysis apparatus 500 for extracting the distance at which the thyroid equivalent dose reaches the reference dose by each bearing; And
(EPZ) evaluated according to the analysis result of the marginal analysis apparatus 500, determines the extent to which the presently set radiation emergency planning zone (EPZ) exceeds the actually set radiation emergency planning zone (EPZ), and evaluates the effectiveness evaluation value A validity evaluating device 600 for determining the validity according to the calculated evaluation value; Assessment System for Radiation Emergency Planning Area in Nuclear Power Plant Using Probabilistic Safety Analysis Results.
The method according to claim 1,
The information collected and stored through the core stock quantity information collecting apparatus 100 is,
Wherein the at least one information includes at least one of half-life, atomic mass, mass, radioactivity, and increase / decrease depending on the nuclide.
The method according to claim 1,
The information analyzed and stored through the stochastic safety analysis device 200 includes,
Wherein the nuclear safety evaluation system includes at least one of accident occurrence frequency, major accident content, and nuclear fraction emission rate according to an accident scenario.
The method according to claim 1,
The information collected and stored through the meteorological data collecting apparatus 300 is,
Wherein the information includes at least one of wind direction, wind speed, atmospheric stability, and precipitation amount according to the measurement time, based on the results of the probabilistic safety analysis.
The method according to claim 1,
The information collected and stored through the population data collection device 400 may be,
Evaluation system for radiation emergency planning zone of nuclear power plant using probabilistic safety analysis results, which includes information on population distribution data by direction / distance.
The method according to claim 1,
The information extracted and stored through the marginal end result analysis apparatus 500 is,
An average external radiation dose per orientation, and an average evaluation value of the pediatric thyroid equivalent dose to the reference dose and a final evaluation distance information obtained by comparing the respective distance information, Evaluation System for Radiation Emergency Planning Area in Nuclear Power Plant Using.
The method according to claim 1,
The effectiveness evaluation apparatus (600)
(10), and calculates an average external system dose and an average equivalent pediatric thyroid equivalent dose according to the final evaluation distance (C) extracted for each orientation, according to the analysis result of the exclusion analysis apparatus (500) A map display module (610) for displaying the area (20) on the validity evaluation map (10) and displaying the current radiation emergency planning area (EPZ) (30) on the validity evaluation map (10);
An area calculation module 620 for calculating the area of the area 20 and the current radiation emergency planning area EPZ 30 according to the final evaluation distance C extracted for each orientation shown in the validity evaluation map 10; And
As a ratio between the area of the current radiation emergency planning area (EPZ) 30 calculated through the area calculation module 620 and the area of the area 20 according to the final evaluation distance C extracted for each orientation, A validity determination module 630 for calculating an evaluation value (EER) and determining validity according to the calculated evaluation value; And the evaluation result of the radiation emergency planning zone of the nuclear power plant using the stochastic safety analysis result.

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