| To Hualong One nuclear power PWR nuclear power unit analysis model with pressurized water reactor nuclear power plant as the research object,using the ASTEC program its severe accident analysis model is set up,build the power plant system node of the primary circuit and secondary circuit diagram,calculate the core requirement and inferior vena room nodes classified figure and containment vessel node figure,system model for the steady-state debugging.Choose LOCA originating the fission product release and migration under the condition of severe accident analysis of large break water loss,to simulate the working condition of severe accidents and gives the specific accident process,focus on the release and migration behavior of aerosols,choose the representative elements respectively(iodine,cesium,etc.)were analyzed,and concluded that its share of the release,the release site and exist in the distribution of different position and shape of the results,and explore the breach location,the size of the crevasse,containment spray system input factors such as the impact on the behavior of fission products.It is necessary to model the system and equipment of nuclear power plant in the analysis and calculation of fission product aerosol under severe accident.The fission product aerosol calculation and analysis model under severe accident mainly simulates the reactor core,the lower head of the pressure vessel,the reactor pit,the primary circuit system,the secondary circuit system,the containment compartment and the related specially designed safety facilities of the Hualong One nuclear power plant,as well as the related work of the pre-processing of numerical simulation.Lord to different location of crevasse big crevasse severe accidents are simulated,the entrance of in-depth analysis of the nuclear power units in the ring cavity,crevasse pipeline,containment internal compartment,into the outside environment of fission products,fission product first for morphological types of analysis,specific share,the curve of the quality change over time,and specifically for aerosol aspects carries on the analysis,find out various composition of aerosols,share and related substances,and to analyze internal compartment of containment,found that different compartments because the position is different,the containment of quality will change,but the overall trend is the same.In view of the severe accidents of the three kinds of breakages,a comprehensive comparison was made,and it was found that the breakages of the heat pipe segment of the primary circuit were similar to those of the voltage regulator fluctuation pipe of the primary circuit,while the breakages were significantly different from those of the cold pipe segment of the primary circuit.Explores on the migration behavior of severe accident aerosols in view of the large break loss of coolant accident modeling,and explore the unit internal migration of aerosol release,explores the containment spray system,break accident of three different forms each space to explore,get the spray system work and the failure of the contrast figure,clear aerosol eventually release a quantity,in addition to break size at cold leg break time road,choose 6 kinds of crevasse size sensitivity analysis,the final acid alkali also affects the aerosol spray water release,to clear the main factors influencing aerosol.in the severe accidents. |
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