KR20090034236A - System for evaluating safety of transporting nuclear waste by road - Google Patents

Abstract

The present invention relates to a safety evaluation system for radioactive waste landmass. Specifically, to assess the risk by establishing a virtual route of the land transport group to calculate the collective dose, to assess the risk, the route is segmented and the collective dose according to the accident status is evaluated for each segmented route, and the evaluated group The present invention relates to a ground transportation safety evaluation system that can derive an optimal safe transport route from a combination of sections based on dose.

The radioactive waste land transportation safety evaluation system according to the present invention comprises a virtual path selection module comprising selecting a plurality of road virtual paths segmented between a radioactive waste generating site and a disposal site; A data input module for receiving and processing respective transport condition data for each of a plurality of sections; A risk assessment module for assessing risk from the input data; A comparison evaluation module for comparing the transportation according to various conditions from the evaluated risk; And a result output module for deriving optimal transport conditions.

Description

System for Evaluating Safety of Transporting Nuclear Waste by Road}

The present invention relates to a safety evaluation system for radioactive waste landmass. Specifically, it is to assess the risk by calculating the collective dose by setting the virtual route of the land vehicle, and segmenting the paths to evaluate the risks, and evaluating the group doses according to the accident status by the segmented paths. The present invention relates to a land transportation group safety assessment system that can derive an optimal safe transport route from a combination of intervals based on the collected collective dose.

Because of the risks associated with radioactive waste, ensuring safety is a charging agent for the transport of radioactive waste. To this end, measures must be taken to ensure that all relevant personnel comply with the safety rules and protect residents and the environment from radiation hazards associated with transportation. Several factors should be considered in determining the route of radioactive waste transport, but the evaluation of radiological safety, ie the covering dose of workers and residents, is very important for the safety and environmental aspects of the residents, apart from the large and small radiation doses. In addition, in the case of activities involving radiation coating, such as the transport of radioactive waste, it is necessary to keep the dose as low as reasonably possible.

In accordance with the International Atomic Energy Agency's Safety Assessment Regulations for the Safe Transport of Radioactive Materials, the radiological impact of transportation may be extended to the transport workers, routes and residents living in the vicinity of the transport routes before carrying out the transport operations. Safety assessment should be preceded.

Many computer codes are currently used in countries to assess the risks of transporting radioactive waste. In order to carry out the transport safety assessment, it is necessary to evaluate the collective dose rate received by the general public and workers during normal transport according to the transport route and the change of the evaluation factors, and the potential risk for the radiation-covered object in the case of a virtual accident. There are various evaluation codes to accomplish this. For example, the British CONDOR code, the INTERTRAN code of France, the US Radtran code, and the like correspond to such codes. The CONDOR code calculates the collective dose according to the type of waste or the route of transportation. The INTRANRAN code calculates the cover dose for transporting trains and vehicles on a 1995 basis. The RADTRAN code is characterized by assessing risk using half-life, particle energy and nuclide characteristics. Currently, the Radtran code is the most used worldwide, and the Radtran code is used to calculate the collective dose of radiation workers and locals for radioactive material transport and virtual accident conditions.

Radiation risk and safety assessments provide the basis for routing by evaluating the radiological impacts of various pathways on a variety of factors, and therefore risk and safety assessments should be preceded to ensure the safe transport of radioactive waste. Radioactive waste can be transported through various routes. Since the transport conditions vary according to the transport route and different safety assessment methods must be applied, the most appropriate stability assessment system along the route needs to be selected and the radioactive waste needs to be transported based on the assessed system. Particularly, in case of land transportation of radioactive waste, there is a possibility of directly damaging not only the environment but also the surrounding residents when an accident occurs, so it is necessary to select a path that can minimize the damage in case of an accident. The present invention provides a land transportation safety evaluation system that can obtain the optimal safe transportation conditions by evaluating the safety according to the transport conditions and the path in consideration of the radiological effects on various transport routes that can be selected in the case of land transport of radioactive waste. Suggest.

The present invention calculates the collective dose through normal transport and derives the collective dose through the data statistics of accidents reflecting the risk of accidents to calculate the collective dose for the entire transport route and optimizes the virtual transport situation. It provides a radioactive waste transportation safety evaluation system that can select the route and use the risk of radioactive leakage in case of actual transportation through the selected optimal route or the estimated risk in case of actual accident. For the purpose of

According to a preferred embodiment of the present invention, the radioactive waste land transportation safety evaluation system includes a virtual path selection module including selecting a plurality of road virtual paths segmented between a radioactive waste generation site and a disposal site; A data input module for receiving and processing respective transport condition data for each of a plurality of sections; A risk assessment module for assessing risk from the input data; A comparison evaluation module for comparing the transportation according to various conditions from the evaluated risk; And a result output module for calculating optimal transport conditions.

According to another suitable embodiment of the present invention, the risk assessment module includes a risk assessment module for evaluating risk by dividing it into normal transportation and accident.

According to another suitable embodiment of the present invention, the data is characterized in that the information according to the actual grounding is data is utilized again as input data.

According to the present invention, by using the traffic statistics data to evaluate the risk according to the collective dose during the virtual transport, it can be applied during the actual transport has the advantage that the radioactive waste can be transported through a low risk safe road. In addition, by applying a feedback system that re-datas the accident risks that occur during actual transportation and reflects them in the actual safe transportation evaluation, the risks associated with transportation are best achieved through the safety evaluation system for radioactive waste land transportation system that reflects actual transportation conditions along various routes. It has the advantage of allowing radioactive waste to be transported through a low land route.

The transport risk assessment is to assess the impact of the transport of radioactive material on normal transport or accident conditions and on the general population living in or near the transport route. Radiation effects associated with normal transport are mainly limited to workers, and in the case of accidents with a very low probability of occurrence, the effects are so low that it is common to apply probabilistic methods to assess the risks associated with transport. For land transport groups, the results of the assessment of the hazards caused by the everyday clothing received by the people in the vicinity of the haul are to be included, as well as the hazards caused by the handling of unloading workers.

Radioactive waste Road traffic statistics are used during normal normal transport to assess the risk of overland traffic. And the transportation accident frequency is calculated based on statistical data about accidents during transportation along each route. Accident frequency applies to the probability of accident occurring when transporting radioactive waste. Based on the probability of accidents, the scenarios of virtual accidents are derived to take into account the risk factors, and the transport risks are evaluated by calculating the radiological risks during transport accidents.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram of a radioactive waste land transportation safety evaluation system according to an embodiment of the present invention.

Referring to FIG. 1, the radioactive waste transport safety evaluation system includes a central management server 10, a safety evaluation program 11, and a database 12. The safety evaluation program 11 includes a virtual path selection module 111, a data input module 112, a risk evaluation module 113, a comparison evaluation module 114, and a result output module 115.

The safety assessment program uses the transport conditions as input data and evaluates the risk according to the transport situation. The risks of the possible transport conditions are compared to determine the best transport conditions.

The virtual path selection module 111 is a program that provides a predetermined path for evaluating safety, determines a location of a waste source and a waste disposal site, and derives an optimal path therebetween. At this time, the most appropriate geographic and human sociological transport routes are selected among the expected land transport routes. There may be several sections between the starting point and the destination, and the set virtual path may be several for each section. In addition, railroads may be selected as appropriate. The set transport route is the basis for the data data to be input later. For example, the population density and the distance passed around the selected transport route are investigated to the minimum unit in the administrative district and used as input data for evaluation. The transport condition data necessary for evaluating the risk based on the set virtual path is input to the data input module 112. The input data may be information about the waste to be transported, the route data, the matter about the transport container, the matter about the transportation means such as the type of vehicle, etc.In the case of a land transportation group, the number of stops, the moving speed and the stop time are the input data. . Incident rates, transit times, shielding factors, and population density around the route and population density in the established route are input data for evaluating the cover dose in risk assessment.

The risk assessment module 113 evaluates a risk according to a given transport route based on the input data. In areas where the risk of accidents is high, the risks of accidents in the accidents are assessed, and the risks of clothing cover to residents in case of accidents in densely populated areas. The risk assessment utilizes codes such as Radtran or Intertran, for example, and is described in detail below.

The comparative evaluation module 114 compares the risks and safety for the possible paths based on the calculated risk data. The result output module 115, which is a safety evaluation program, derives an optimal safe transport condition in actual transport from each of the compared transport conditions. Data input and output of calculated results can be totally managed by the administrator at the central management server. The result of each module is stored in the database 12 and managed. Each condition and result can be applied in various ways.

When calculating the risk in the risk assessment module 113, mainly Radtran or Intertran code is used. These codes are mainly used to calculate the collective cover doses of workers and residents for radioactive material transport and virtual accident conditions. Radtran codes use nuclide characteristics such as half-life, particle energy, and dose-conversion factor, and are capable of analyzing and evaluating the probabilistic effects of coating dose in consideration of inhabitability. Intertran or Radtran codes are also compatible. Entering data into the Intertran or Radtran codes calculates the consequences of the accident, the situation and the degree of risk, depending on the configuration. At this time, the main input variables are the package type of radioactive material, the number of packages, the number of shipments per year, the amount of radioactivity in the package, the transport index, the transport distance and the transport situation. Modeling of the transport route in the Intertran or Radtran computational code is classified according to population density, and there is a transport model divided into outlying areas, suburbs, and rural areas. The proportion of each route in the route that passes through this area is used as input for the calculation of population density. The main variables that apply to the calculation include the packaging status of the radioactive material, the quantity of the package, the number of shipments per year, the amount of radioactivity in the package, the delivery index, the delivery distance and the transport situation. In addition, it is possible to mark the location of people and to consider radiation shielding by buildings, etc. in the risk of covering. In virtual accidents, individual effective doses are calculated using a model of radiation dose at various locations. In the effective dose assessment, individual effective doses can be converted into risks, for example using dose-risk conversion factors recommended by the International Commission on Radiological Protection (ICRP).

In land transport risk assessments, the transport route often passes through dense areas of the population, so the results of the daily risk assessments of the daily coverage of the residents around the transport route are also included. Therefore, the following describes the risk assessment in normal transportation and the risk assessment in the case of a virtual transportation accident.

2 is a diagram illustrating a risk assessment process during normal transportation according to an embodiment of the present invention.

Referring to Figure 2, it is assumed that the external dose rate of the packaging material transport (S20). The collective dose is calculated by dividing each section of the set path (S21), and the risk (S22) is calculated. At this time, the collective dose is calculated in consideration of factors such as the transportation mode, the moving speed, the number of stops, the transportation route, the population density around the route, and the vehicle density. Other factors to consider during normal transport include crew members, unloading workers and warehouse workers, pedestrians around radioactive material carriers, individuals in residents and vehicles, workers in areas where frequent transport is carried out, and people living near the shipping or destination of radioactive material. The type of clothing of the individual is considered. Population density classification criteria for regional classification can be divided into urban areas, suburbs, and rural areas. Based on the population density per 1 km ² , the areas with more than 1,000 people are classified into urban areas and 150 to 1,000 suburban areas with less than 150 rural areas. The data as described above is input to the data input module to calculate the collective dose and risk for each section of the set path.

3 is a diagram illustrating a process of evaluating collective dose and risk in an accident according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the accident category is classified into a diffuse waste (S31) and a non-diffusing waste (S32) at the time of accident (S30), and the amount of coating is calculated. Since the non-diffusing packaging waste (S32) is directly coated to calculate the direct coating amount (S321). Non-diffusing waste (S32) is no longer spread radiation when treating the waste itself. However, in the case of diffuse waste (S31), radiation is diffused through the atmosphere. In the case of diffuse waste (S31), based on the isotope content when calculating the collective dose, the atmospheric diffusivity is evaluated (S312), the accident frequency is calculated (S313), and the reaction state of the package is calculated at the accident (S314). . According to the response of the vesicles can be calculated the collective dose diffused through the atmosphere (S315). The risk is calculated through the direct dose and the collective dose evaluated above (S33).

4 illustrates an algorithm for evaluating the safety of a set virtual path according to an embodiment of the present invention.

Referring to FIG. 4, a transport route sectioning is performed to set a virtual transport route (S40) and divide the set route into several sections (S41). As described above, the path setting and the segmentation may include several virtual paths between the radioactive waste source and the disposal site, and several virtual paths may be variously segmented. Risk assessment is performed for each segmented route, after which a safe route can be derived from the combination. When the route is segmented, the probability of an accident is calculated by referring to the road statistics (S42). From the calculated likelihood of occurrence of the accident, the risk of radioactive transport depending on whether the accident (S43) through the risk of the accident is determined. According to the risk of accidents, the collective dose is calculated during normal transport without an accident (S44). Collected dose in normal transport is calculated according to the method described with reference to FIG. And collective dose is calculated when the accident is assumed in the section with high probability of accident. In the case of a virtual accident, an accident scenario is derived based on information and transport information of a given section (S45). Through the derived accident scenario, the collective dose is calculated at the assumed accident (S46), and the collective dose calculation at the accident may be performed as in the method described with reference to FIG. 3 above. Such a process may be performed using, for example, Intertran or Radtran codes through the transport condition data in case of an accident as described above. The risk is calculated based on the calculated collective dose after calculating the collective dose in the case of normal transport or accident (S47). The risk of each section is calculated by repeating the process of calculating the collective dose for the other sections. The operation of comparing the risk of each section through the calculated risk (S48). As described above, an optimal safety path may be derived from a combination of a plurality of paths through a risk comparison operation for each path (S49).

The land transportation group safety evaluation system according to the present invention can evaluate safety using various data, and obtain transport conditions with optimal safety conditions. In the case of land-based farming, in particular, the data can be refined to effectively assess the risks and safety of actual land-based farming. Due to the nature of land transportation, there is a radiation effect on local residents. Therefore, the risk assessment involved in normal transportation is used as a data for reducing the risk and safe transportation in normal transportation. In addition, accidents that occur during actual transport are re-datad as a new dangerous condition, which can be effectively applied to actual transport by providing feedback to obtain safety conditions.

The present invention has been described above in detail by using an embodiment. The presented embodiments are exemplary and can be made by those skilled in the art to various modifications and modifications to the disclosed embodiments without departing from the spirit of the present invention. The scope of the invention is not limited by these modifications and variations, but only by the claims appended below.

1 is a block diagram of a radioactive waste land transportation safety evaluation system according to an embodiment of the present invention.

2 is a diagram illustrating a risk assessment process during normal transportation according to an embodiment of the present invention.

3 is a diagram illustrating a process of evaluating collective dose and risk in an accident according to an exemplary embodiment of the present invention.

4 illustrates an algorithm for evaluating the safety of a set virtual path according to an embodiment of the present invention.

Claims (3)

In the radioactive waste land transportation safety evaluation system, A virtual path selection module comprising selecting a plurality of overland virtual paths segmented into a plurality of areas between a radioactive waste generating site and a disposal site; A data input module for receiving and processing respective transport condition data for each of a plurality of sections; A risk assessment module for assessing risk from the input data; A comparison evaluation module for comparing the transportation according to various conditions from the evaluated risk; And A radioactive waste transportation safety assessment system that includes a resultant output module that yields optimal transport conditions. The radioactive waste transportation safety evaluation system according to claim 1, further comprising a risk assessment module for evaluating risk by dividing the risk into normal transportation and an accident. The radioactive waste land transportation safety evaluation system according to claim 1, wherein the information according to the actual land transportation is converted into data and used as input data.

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