Research On Quantitative Evaluation Method Of Emergency Evacuation Time In Hongyanhe Nuclear Power Plant

At present,nuclear power,as a representative new clean energy with stable and high energy density,has become one of the main forms of power energy supply in the world.Under the guidance of the policy of "actively developing nuclear power",many large nuclear power plants in my country have been put into operation.As of August 2022,the rated installed capacity of nuclear power units put into commercial operation in my country is 55.59 million kilowatts,and the total number is 53.Nuclear power plants under construction It has 23 units,ranking third in the ranking of nuclear power units in the world.With the rapid development of nuclear power,nuclear power safety issues cannot be ignored,especially the hazards caused by the Fukushima nuclear accident in Japan,which has deeply alerted the world.Aiming at the serious accident of nuclear power plant that caused a large amount of airborne radioactive material to leak,which caused serious harm to the public,nuclear power plant staff and the ecological environment during the diffusion process,under this background,Hongyanhe Nuclear Power Plant was used as the simulated object of the hypothetical accident,aiming at The calculation and evaluation of emergency evacuation time in the off-site emergency response of Hongyanhe Nuclear Power Plant has been studied in depth.The main work is as follows:First of all,this paper takes the off-site emergency response of nuclear power plants as the research background,and uses the case empirical research method to study the calculation of emergency evacuation time in the process of off-site emergency response of Hongyanhe NPP.In the calculation of evacuation time,according to the principle of "one plant,one case",according to the topography,population distribution and traffic road network information of Hongyanhe Nuclear Power Plant,three assembly points are selected within the area of the plume emergency plan area,and in the emergency plan Three resettlement points are selected in the outer area;at the same time,the weight of the road network is used as input,and three emergency evacuation routes are constructed by using the Dijkstra path planning algorithm.Secondly,this paper simulates the diffusion of airborne radioactive substances.According to the real meteorological data,the HYSPLIT model is used to restore the Fukushima nuclear accident in Japan to verify the accuracy of the model;at the same time,the GDAS meteorological data in May 2022 is selected,and 131 I and 137 Cs are selected.and inert gas as the characteristic nuclides,set up two sets of simulation cases of radioactive material diffusion caused by severe accidents in Hongyanhe Nuclear Power Plant,and conduct research from the airborne radioactive material diffusion trajectory,ground deposition and 100 m high-altitude radioactive material diffusion.The importance of evacuating the public within the area of the emergency planning area,and the diffusion trajectory as the basis for judging the selection of the evacuation plan,will finally provide evaluation parameters for accident consequence evaluation.Finally,each part of the evacuation time is calculated separately: the travel time is the sum of the notification time and the preparation time,and the travel time required for 100% people to get ready and receive the notification is calculated by using the probability distribution;for the vehicle evacuation process,Set up a variety of common scenarios in the Hongyanhe NPP area,set the vehicle traffic speed under different conditions for different evacuation scenarios,and then calculate the traffic time for different levels of road segments,and calculate the evacuation time required for different evacuation schemes.