Nghiên cứu ứng dụng mô hình khu vực đánh giá phát tán và ảnh hưởng phóng xạ hạt nhân tới lãnh thổ việt nam từ các nguồn xuyên biên giới TA

MINISTRY OF EDUCATION AND TRAINING MINISTRY OF SCIENCE AND TECHNOLOGY VIETNAM ATOMIC ENERGY INSTITUTE RESEARCH AND APPLICATION OF THE REGIONAL MODEL (FLEXPART-WRF) IN ASSESSING THE ATMOSPHERIC DISPERSION AND EFFECTS OF RADIOACTIVE FALLOUTS ON THE VIETNAMESE TERRITORY Major: Nuclear and Atomic Physics Code: 44 01 06 SUMARY OF DOCTORAL DISSERTATION OF PHHYSICS Hanoi - 2022 The name of the postgraduate training institution: Nuclear training center, Vietnam Atomic Energy Institute 140 Nguyen Tuan, Thanh Xuan, Hanoi Supervisor: Dr Vietnam Atomic Energy Institute Dr Institute of Geophysics, Vietnam Academy of Science and Technology Introduction Motivation Forecasting and calculating the trajectory and impact on the environment of the radioactive plume from nuclear incidents are absolutely necessary To improve the efficiency of forecasting and the calculation of near-range radioactive emissions require more detailed and comprehensive studies of regional influences on atmospheric dispersion such as: - Initial conditions (resolution, meteorological data, source terms ); - Microphysics factors of the process of radionuclide dispersion in the atmosphere; - Sensitivity and reliability of physical-mathematical models for radionuclide dispersion in the atmosphere; For the above-mentioned reasons, the research topic entitled: “Research and application of the regional model (FLEXPART-WRF) in assessing the atmospheric dispersion and effects of radioactive fallouts on the Vietnamese territory” was chosen Dissertation objectives The purpose of the dissertation is to find out the radioactive dispersion assessment model suitable for the conditions of Vietnam, which is expressed by four specific objectives: - Study the appropriate mathematical model for the regional radioactive emission assessment; - Study the regional meteorological model and the factors that affect the accuracy of meteorological conditions in the area ; - Verifying the calculation of radioactive dispersion in the atmosphere through the accident of the Fukushima Daiichi nuclear power plant; - Applying the selected model to assess the impact on the Northern area of Vietnam in case of a nuclear incident occurs from the Fangchenggang/China nuclear power plants Work performed in the dissertation With the above-mentioned general objectives, the dissertation needs to address the following issues: - Studying and selecting the simulation model, evaluate the radioactive dispersion in the atmosphere (FLEXPART-WRF); - Studying the influence of regional factors such as topography, vegetation, regional meteorological field, and microphysical parameters in the atmosphere, which affect the accuracy and reliability of the model; - Evaluating the reliability of the model through the simulation results of radiation emission from the Fukushima incident with the results from Futaba and Nahara monitoring stations using the Taylor diagram - Applying suitable configurations to simulate the incident of the Fangchengang nuclear power plant in March 2020 affecting Vietnam, including the impact on the environment and the population in the Northern area of Vietnam Scientific impact of the dissertation Scientific impact - The application of the area model (Flexpart-WRF) to evaluate and simulate the short-range radioactive dispersion in the atmosphere is appropriate and gives results that have a high correlation with real monitoring results; - Select the microphysics configuration including topography, vegetation, regional meteorological field, microphysical parameters in the atmosphere (from 48 trials in the dissertation) for the regional meteorological model WRF and short-range radiation emission assessment simulation code (Flexpart-WRF); - Assess the impact on the environment and citizens in the Northern area of Vietnam in the case of a cross-border nuclear incident Major results - Perform 48 tests (24 microphysics configurations with 02 source terms) to evaluate the sensitivity and correlation of the regional model in the simulation and assessment of radioactive material dispersion in the atmosphere - Select a number of configuration sets to apply to the simulation problem for the North Vietnam region - Calculation results of the level of impact on Vietnam from the hypothetical nuclear accident at Fangchenggang NPP The practical application of the dissertation The contents of the dissertation are the basis for applying calculation and simulation tools to the reality of command support to the Head of the Ministry of National Defense and The National Committee for Search and Rescue (VINASARCOM) in response to transboundary nuclear incidents Dissertation layout The dissertation consists of 136 pages, 12 tables, 73 figures, 04 published papers, 69 references, and pages of appendices and is distributed as follows: Introduction: 03 pages, introducing the motivation, purposes, objectives, and scope of research, scientific and practical significance of the dissertation; Chapter 1: Assessment of the risk of impacts from transboundary nuclear incidents and the literature review of research and assessment of radioactive dispersion in the atmosphere (28 pages); Chapter 2: Research Methodology (32 pages); Chapter 3: Results and discussion (48 pages); Conclusions and recommendations (02 pages); List of published papers during dissertation, references, and appendices CHAPTER LITERATURE REVIEW OF RISK ASSESSMENT OF THE TRANSBORDER NUCLEAR INCIDENTS 1 Evaluating the effect risk from transnational NPP accidents The site and layout of nuclear power facilities must fulfill extremely high safety standards while also meeting economic, technological, social, and environmental concerns, with a focus on reducing consequences According to experts, China's nuclear power program is being implemented too rapidly in terms of both quantity and variety of technology, but it is essentially replicating established technologies Meanwhile, the risk management system for nuclear safety and security remains restricted, possibly generating substantial operational hazards When incidents occur, nuclear power facilities have a wide-ranging detrimental impact, including in Vietnam, as follows: - In the case of a nuclear accident at the Fangchenggang Nuclear Power Plant, the areas of Fangcheng, Qinzhou, Beihai, and Guangxi within a 30km radius of the incident would be exposed to radiation, affecting nearby regions and territories as follows: If the incident occurs in winter, with the Northeast region's topographical characteristics being the midlands and low hills, with many arcs extending to the north and in Tam Dao/Vinh Phuc, combined with the Northeast monsoon, the entire Northeast region, and the Red River Delta will be affected by radioactive fallout within 10 to 12 hours In the period of 02 - 03 days, it may affect most of the North of Vietnam; If the incident occurs in the summer: the wind direction will turn to the north, so it will affect most of Guangxi and part of Ha Giang, Cao Bang/Vietnam Water sources: Due to the features of ocean currents, radioactive compounds may follow coastal currents within 24 hours, producing radioactive pollution in the Beihai region, the Leizhou peninsula, the northern portion of Hainan island, and all coastal provinces in North and Central Vietnam - In the event of a nuclear accident at the Changjiang and Yangjiang nuclear power plants, Hainan and Yangjiang islands/Guangdong province will be immediately exposed to radiation, affecting nearby territories In winter, monsoon and ocean currents in the northeast-southwest direction will bring radioactive dust to the North Sea, Leizhou peninsula, north, and northwest of Hainan island/China, as well as the Hoang Sa archipelago and the central provinces of Vietnam; in summer, winds and ocean currents in the Northwest and Southwest - Northeast directions will bring radioactive dust to infect the Beihai area, Leizhou peninsula, Northwest of Hainan island/China, and the Northern coastal provinces of Vietnam - When a nuclear disaster (nuclear reactor explosion) happens, the amount of damage is several times larger, destroying human life and the environment within a 30km radius and leaving environmental impacts Studies on atmospheric radioactive dispersion Lessons from the Fukushima nuclear power plant accident in March 2011 highlight the critical importance of environmental radiation monitoring, simulation, calculation, and assessment of radioactive material emissions from nuclear power plants in the preparation and response to radiation and nuclear incidents Many research groups and organizations throughout the globe have undertaken extensive study in the area of modeling and assessment of radioactive material dispersion in the atmosphere as a result of nuclear plant mishaps Literature review Prior to the Fukushima nuclear plant accident, researches were conducted to assess the dispersion ability and compute the movement trajectory of particles (aerosols) in the atmosphere Fast et al [1] utilized the findings of a WRF model that simulated circulation fields in central Mexico in 2006 In 2011, Foy et al used the FLEXPART-WRF model to investigate the movement and transformation of aerosol particles (exhaust gases) in metropolitan Mexico[2] Zarauz and Pasken (2010) utilized the WRF model to simulate meteorological fields for the computation of the CALPUFF and HYSPLIT gas emission models to analyze pollution dispersion in the atmosphere Angevine et al (2013) investigated the transport of contaminants in the California region using the Lagrangian FLEXPART particle dispersion model (2015) utilized the FLEXPART-WRF model to simulate NOx dispersion in the atmosphere over Ranchi, India's complicated terrain [6] a) Study on the radioactive emission from the Fukushima nuclear plant incident on a local-scale In 2012, Katata et colleagues utilized the GEARN software's Lagrange particle dispersion model to simulate radioactive particles I-131 and Cs-137 in a 190 km2 region around the Fukushima Daiichi nuclear power plant [7] Srinivas et al (2012) [8] published a simulation of regional-scale air dispersion of radioactive substances from the Fukushima Dai-ichi nuclear power plant accident Furthermore, Korsakissok et al conducted research on "studying and evaluating the sensitivity of localized air dispersion and surface deposition from the Fukushima nuclear accident" [61] Christoudias et al (2014) employed the EMAC (atmospheric circulation model) model with a resolution of 50 km to estimate the worldwide risk of radioactive leaks into the atmosphere from future radioactive incidents [9] b) Study the radioactive emission on a regional-scale Terada et al constructed various regional-scale analytical models with the goal of analyzing the source terms, dispersion processes, and dosage distribution of certain radioactive chemicals (I-131 and Cs-137) [43], the authors utilized the GEARN software's Lagrange particle dispersion model to compute radioactive air dispersion and re-evaluate the source and emission parameters of I-131 and Cs137 from the 2011 Fukushima nuclear plant accident H Huang et al from the People's the Public Security University of China in China also performed regional research, the results of which were published in the journal Atmos Chem Phys in 2014 The researchers evaluated the dry and wet deposition of two isotopes, I131 and Cs-137, using the Eulerian dispersion model in the WRF-Chem program [62] c) Researching the process of radioactive dispersion on the global-scale Many research groups around the world have conducted global-scale radioactive dispersion studies, and the research of Roland Draxler et al (2015) in many countries around the world has used many different global analytical models to assess the extent of radiation effects after the Fukushima nuclear power plant accident [14] Wai, K M , and Peter, K N (2015) evaluated the possibility of the influence of radioactive Cs-137 emitted from accidents (similar to the Fukushima accident) at nuclear power plants in southern China with different four-season meteorological conditions using the Lagrange particle dispersion model in HYSPLIT4 software [10] Rakesh et al (2015) utilized the FLEXPART-WRF model to simulate radioactive material dispersion in the air at a fictional nuclear power facility in southern France[11] Shekhar et al (2020) conducted research and developed the "Online Nuclear Emergency Response System" (ONERS) It is a "Decision Support System" (DSS) designed to handle nuclear incident-related situations at Indian Nuclear Power Plant locations 2 Domestic research From the 1980s to the 1990s, the Nuclear Research Institute (NRI) VINATOM studied the propagation of radioactive materials from nuclear power plants With the scientific advice of Professor Pham Duy Hien and the participation of many experts, however, the new studies only focus on understanding the methodology and simulating the emission from the NPP to the area according to the wind directions of the year The Nuclear Research Institute (NRI) - VINATOM researched the transmission of radioactive elements from nuclear power plants from the 1980s through the 1990s The latest research, however, with the scientific assistance of Professor Pham Duy Hien and the cooperation of many specialists, solely concentrates on comprehending the technique and modeling the emission from the NPP to the region according to the wind directions of the year Prof Pham Duy Hien, Dr Nguyen Hao Quang, and Dr Pham Kim Long used the Lagrange long-range particle dispersion model in 2011 to examine the spread of radioactive substances such as Cs-137 and I-131 from the Fukushima disaster to the Western Pacific and Southeast Asia; From 2011 to 2015, Dr Nguyen Tuan Khai conducted studies on "Researching and assessing the environmental impact of radiation emitted from nuclear power plants According to the study findings, the match between the FLEXPART model and the monitoring data is good However, there is still a difference between the estimated concentration levels and the actual ones Meteorological variables influence the dispersion process in the atmosphere Vietnam is in Southeast Asia and has borders with East Asia, the Western Pacific Ocean, and South Asia The whole region above ranges in latitude from 10°S to 50°N and longitude from 70°E to 150°E It encompasses tropical, subtropical, and temperate climates The troposphere is the layer where most transport and dispersion occurs for most air pollution processes in general and radioactive dispersal in particular The troposphere is the atmosphere's most active layer This layer is responsible for 80% of the air mass and almost all of the water vapor in the atmosphere Clouds, rain, and thunderstorms are all unique to this location These are the variables that have a direct impact on the radiation beam as it travels through the atmosphere Atmospheric dispersion model Commonly used dispersion models include the Gaussian particle beam model, the Gaussian particle bubble model, the Lagrangian seed dispersal model, the Eulerian dispersion model, and computational fluid dynamics (CFD) modeling The current variety of atmospheric dispersion models available spans from basic to complicated The unique needs of radiation risk assessment and Meteorological assessment The ERA5 reanalyzed meteorological data, with an initial (raw) resolution of about 31 km, could not reproduce meteorological variables over the complex topography of the Japan region The WRF model can scale the dynamics down to a finer grid resolution (05 km and 01 km in this study) Figure Simulation of position elevation (color) and wind field (bark) at 850 Mb on March 15, 2011, at 12:00 UTC using the WRF model in test (a), compared to reanalyzed data ERA5(b) for the first test (a) (b) Figure Simulation of topographic elevation (color) and wind field (barb) at 850 mb, March 15, 2011 at the Fukushima NPP location Figure 3 Simulated rainfall accumulated from the WRF model in test-1, from 09:00 to 15:00 on 15 March 2011 The amount and intensity of rain in this case (Figure 3) give similar results to the simulation results from the study of G Katata et al 19 3 Evaluating the sensitivity of radioactive dispersion simulation results with microphysics diagrams The Futaba monitoring station is located around kilometers from the Fukushima nuclear power plant, which has also been significantly damaged by earthquakes, tsunamis, and radiation impacts Due to grid resolution limitations, the neighborhood of the plant is typically not taken into consideration in other studies that use the global radioactive dispersion model We calculated the radiation influence on Futaba and other neighboring stations using a high resolution of 01 km in this investigation (Naraha station) The results of estimating the concentration of radioactive Cs-137 in the atmosphere in hourly time at Futaba and Naraha stations using Katata's emission source term are given in Figure 4; similar findings are provided in Figure using Teranda's source term Tsuruta et al provided the monitoring data used in these figures (2011) (a) (b) Figure Comparison of simulation results with observed values at Futaba (a) and Nahara (b) stations using Katata’s source terms 20 (a) (b) Figure Comparison of simulation results with observed values at Futaba (a) and Nahara (b) stations using Teranda’s source terms Figures and depict the temporal distribution of radioactive Cs-137 surface fallout in Futaba, Naraha In general, 48 experiments accurately mimicked places where Cs-137 was deposited The simulation findings match the actual data, particularly from March 12 to March 14 and March 16, 2011 at the Futaba monitoring station and March 15, 2019 to March 16, 2011 at the Naraha station Cs-137 concentrations at the Futaba station on March 12, 2019 and March 19, 2011 were well replicated in all experiments The FLEXPART-WRF software successfully replicated Cs-137 radiation concentration values at the Naraha monitoring station on March 15, March 16, and March 19, 2011 For monitoring values of radioactive concentrations less than 102Bq/m3, there is a large error between simulated and observed values; corresponding to periods of radioactive emissions from the incident into the environment are low, such as day 14, 17 or 19, the model gives significantly lower emissions (Figure (b) Nahara station) 21 reliability and reliability The sensitivity in the simulation related to different microphysical factors and the frequency of the emission source has been shown more clearly when comparing the results with the Futaba and Nahara monitoring stations This can be seen in the simulation results on March 13-14, 2011 and March 19-21, 2011 in Figure 4(a) (Futaba station) and March 17,18 and 20, 20111 shown in Figure 4(b) (Nahara station) The simulated and observed values at the station on March 15, March 17-18 vary significantly, presumably because the rain simulation technique is not near to the reality of the WRF model (at the same time) There was a lot of rain in the region where the monitoring stations were situated In addition to assessing the deposition of radioactive Cs-137 over time, the spatial distribution of Cs-137 radioactive dispersion is calculated The results from the test-4 (Figure 6) show radioactive Cs-137 concentrations in radioactive plume at 100 m altitude over three different days with (a): time from 00 UTC 12 to 00 UTC 13/03/2011, (b): time from 00 UTC 15 to 00 UTC 16/03/2011 and ( c): time from 00 UTC 19 to 00 UTC 20/03/2011 Unit: Bq/m3 ( ( ( Figure Spatial distribution at local-scale of Cs-137 activity Uncertainty evaluation The sensitivity of the simulation findings for various physical variables of the WRF model is shown in Figure when compared to the actual observed values at Futaba (a) and Nahara (b) stations To compare and assess the findings between simulation and observation, tests with a standardized standard deviation (σ) of more than will not be presented in the graph (a1) and (b1) use Katata's source term; (a2) and (b2) use Teranda's source term 22 ( (b1) (a2) (b2) Figure Taylor diagram compares 24 simulated results of radiation concentration with the observed value of the radioactive concentration of Cs-137 at Futaba (a) and Nahara (b) stations Through the results shown in Figure 7, it can be seen that the use of different emission source terms in modeling the dispersion process gives dissimilar results Therefore, there is a need for further studies on re-evaluating the emission source term in future studies There is no consensus on which configuration is best when evaluated across stations, for example, test-5 is poor at Futaba station but good at Naraha station 23 The measured Cs-137 concentrations at Futaba and Naraha stations from March 11 to March 26, 2011 were compared to modeling findings The simulation findings from the experiments depict the acceptable shift in Cs-137 concentration as the event progresses Based on the Taylor chart analysis to assess the sensitivity of simulation findings for 24 physical configurations, various test configurations, including test-19, test-21, test-23, test-4, test-5, test3, and test-15, are suggested for future investigation This is the foundation for selecting some feasible configurations for assessing radioactive dispersion from the Fangchenggang NPP to the Northern region of Vietnam Simulation results of radiation dispersion from the hypothetical nuclear accident at Fangchenggang/China NPP Configuration Figure depicts the WRF model's computational domain, with the outside domain at 5km resolution and the inner domain at 1km resolution Data for boundary and baseline conditions are derived from ERA5 reanalysis data with 25° resolution, which is updated hourly The WRF model was conducted with 51 atmospheric vertical levels and four soil layers Time of simulation: 12:00 UTC on 12/03/2020 to 12:00 UTC on 03/17/2020 Figure Computational domain of WRF model 24 In this dissertation, the list of parameter selected to simulate dispersion and assess the risk of impacts from the incident of Fangchenggang NPP were selected from 24 configurations in Section 3 Details of the selected configurations are shown in Table Table Set of parameterization schemes for microphysics processes No Experiment Exp01 (Config 15) WRF-ARW configuration Cloud Planetary Radiation microphysics boundary class scheme scheme scheme WSM 6-class graupel scheme Mellor-YamadaJanjic (Eta) TKE scheme RRTM scheme/ Exp02 Dudhia (Config 04) Kessler scheme scheme Exp03 MYNN level (Config 05) TKE scheme 2 Concentration of Cs-137 in the atmosphere According to the test findings, there is a consistency in the Cs-137 concentration data from three experiments with varied parameterization settings However, the Exp03 test differs from the Exp01 and Exp02 tests in one important way: the quantity of radiation discharged toward China with a greater radioactive cloud area from Figure 9a to Figure 9c, respectively This distinction was maintained as radioactivity extended towards the South China Sea on March 13, 2020; by March 14 to 15, 2020, radioactive emission was more visible in the north of Vietnam (Figures 10 and 11) This matches the regional meteorological conditions, which include cumulative winds and surface-level precipitation (Figure 12) Furthermore, throughout the winter (often from November to March), polar air masses originating from the Siberian Plateau reach deep into low-latitude locations such as Vietnam, thanks to the Eastern Plateau Tibet shifts the air from the south to the northeast As a result, the northeast wind direction influences radioactive dispersion The primary goal of this research is to determine the extent of the effect of the Fangchenggang NPP event on Vietnam during the winter monsoon season conditions 25 Figure Spatial distribution of Cs-137 concentration in March 12 2020 in Exp01 (a), Exp02 (b), and Exp03 (c) Hình 10 Spatial distribution of Cs-137 concentration in March 14 2020 in Exp01 (a), Exp02 (b), and Exp03 (c) Hình 11 Spatial distribution of Cs-137 concentration in March 15 2020 in Exp01 (a), Exp02 (b), and Exp03 (c) Figure 12 Cumulative wind volume and surface precipitation on March 14, 2020 26 The dry and wet deposit of Cs-137 was determined using three distinct tests from March 12 to 16, 2020 On 12/3/2020, it is obvious that there is a difference in the distribution of radioactive zones between the simulation results from Exp03 (Figure 13c) and the other findings (Figure 13a-b) On March 14, 2020, the Exp03 experiment (Figure 14c) revealed a small and large band of radioactive Cs-137 dry and wet depositions In Figure 12, it was discovered that Exp01 (Figure 15a) and Exp02 (Figure 15b) replicated dry and moist deposition of radioactive Cs-137 The frequency range is shorter and larger than that of Exp03 due to the impact of the planetary boundary layer on the thermodynamical structure and atmospheric flow fields Figure 13 The dry and deposit of Cs-137 on March 12, 2020 Figure 14 The dry and wet fallout of Cs-137 on March 12,2020 The high effective dose on the mainland of northern Vietnam on March 15, 2020, may be attributed to the flow of radioactive elements in the direction of the prevailing northeast wind and the occurrence of rain in the summer At the 27 time, the wet deposition procedure was primarily responsible for the greater effective dose in North Vietnam Figure 15 Spatial distribution of effective dose rates on 14/3/2020 with Exp01(a), Exp02(b), and Exp03(c) Figure 16 Spatial distribution of effective dose rates on 15/3/2020 with Exp01(a), Exp02(b), and Exp03(c) According to the simulation results, the effect level of the event at Fangchenggang NPP would affect regions and cities in northern Vietnam Figure 17 depicts the geographical distribution of simulation findings of effective dose (radioactive concentration) induced by radionuclides over the 217-hour period after the evet, when radioactive clouds dispersed reaching North Vietnam within 48 hours of the disaster The effective dosage ranges between and 3mSV and will impact the populations of the following provinces: Quang Ninh, Hai Phong, Hai Duong, Thai Binh, Hanoi, Bac Giang, Bac Ninh, and Cao Bang Figure 17 depicts the amount of radioactive contamination (radioactive concentration) in Vietnam's northern regions in March 2020 28 Figure 17 The radioactive contamination level of the northern provinces of Vietnam in March 2020 corresponds to Exp01(a), Exp02(b), and Exp03(c) The incident scenario for Fangchenggang NPP was conducted based on the outcomes of the hypothetical simulation, it is feasible to analyze the influence of microphysical parameters on propagation and deposition simulation results using 03 distinct microphysics settings The three simulation results shown in Figure 17 demonstrate that radioactive clouds moved to the north of Vietnam within 48 hours after the accident Because there was a substantial disruption in the wind field mixed with rain reported in the coastal region about 100h to 150h after the event happened, 29 certain places did not record the incidence of radiation This might explain why the radioactive isotopes were washed away before being dispersed to the aforementioned areas Residents in Quang Ninh, Hai Phong, Hai Duong, Thai Binh, Hanoi, Bac Giang, Bac Ninh, and Cao Bang will be affected by effective doses (radioactive concentrations) ranging from to 3mSv These effective dosage levels are larger than mSv, according to international and national laws, thus the total quantity of food and food in the aforementioned regions will be temporarily unavailable for use 30 Conclusion The FLEXPART-WRF software was used in the dissertation to simulate and analyze the effect of radioactive Cs-137 from the Fangchenggang/China nuclear power plant on the northern area of Vietnam The influence of regional meteorological factors on the results of the dispersion simulation problem was evaluated during the research process, and the test results were compared and evaluated with values at important stations, namely Meteorological measurements of the Central Hydrometeorological Forecasting Center and environmental radiation monitoring stations in Futaba and Nahara, Japan The study method findings reveal that it is appropriate and capable of capturing the extreme values, as well as the similarities between the simulated and observed values, allowing us to reach the following conclusions: - The dissertation studies (48 experiments) demonstrated the sensitivity of the microphysical parameters in the meteorological forecasting model (WRF) and the appropriate source terms for using the FLEXPART- WRF in predicting radioactive dispersion; this allowed for the optimal configuration of the microphysics configurations and source terms for the simulation and assessment of radioactive dispersion from Fangchenggang NPP to the north of Vietnam - The findings of simulation and recalculation for the issue of radioactive dispersion in the atmosphere caused by the Fukushima nuclear power plant incident are identical when compared to other observed values at two monitoring stations, Futaba and Nahara - The dissertation research results serve as the foundation for building and further developing a method to evaluate radioactive emission near-range; calculation and simulation results from the Flexpart-WRF model serve as the foundation and initial data to help prepare for and respond to incidents and accidents at Fangchenggang NPP 31 Papers published during the dissertation I Scopus journal , Nguyen Hao Quang, Nguyen Thi Hang, Nguyen Thi Thoa “Simulating the potential impacts of nuclear power plant accident for Northern Vietnam”, Journal of Water, Enviroment and Polution; DOI 10 3233/AJW220017 e-ISSN: 1875-8568,Volume 19, No2– March,2022,pp1-8; Scoupus index II International journal , Nguyen Hao Quang, Hoang Huu Duc, Nguyen Thi Hang, Nguyen Thi Thoa and Nguyen Quang Trung, “Study on numerical models to evaluate atmospheric dispersion of radioactive materials on Vietnam territory”, IOSR Jounal of Applied Physics (IOSR-JAP) e-ISSN: 2278-4861, Volume 12, Issue Ser II (Nov - Dec 2020), Pages 51 - 63 III National scientific journal , Nguyen Hao Quang, Hoang Huu Duc, Đinh Van Thin, “Kết hợp mơ hình phán tán hạt Lagrangian mơ hình khí tượng khu vực dự báo phát tán phóng xạ Việt Nam”, Journal of Military Science and Technology, ISSN:1859-1043, No 68, 8-2020, Papes150-159 , Nguyen Hao Quang, Hoang Huu Duc, Nguyen Thi Hang, Nguyen Thi Thoa and Nguyen Quang Trung “Simulation of atmospheric radiocesium (137Cs) from Fukushima nuclear accident using FLEXPART-WRF driven by ERA5 reanalysis data”, Nuclear Science and Technology, Vietnam Atomic Energy Society and Vietnam Atomic Energy Institute, Vol 10, No 3(2020), pp 01 - 12 32 ... Hoang Huu Duc, Đinh Van Thin, “Kết hợp mơ hình phán tán hạt Lagrangian mơ hình khí tượng khu vực dự báo phát tán phóng xạ Việt Nam? ??, Journal of Military Science and Technology, ISSN:1859-1043,... with values at important stations, namely Meteorological measurements of the Central Hydrometeorological Forecasting Center and environmental radiation monitoring stations in Futaba and Nahara,... best when evaluated across stations, for example, test-5 is poor at Futaba station but good at Naraha station 23 The measured Cs-137 concentrations at Futaba and Naraha stations from March 11 to