Experiments for liquid/vapor equilibrium of multicomponent nitrate solution

Yoshida, Kazuo ; Abe, Hitoshi 

Boiling accidents of reprocessed liquid wastes are postulated to be occurred caused by the loss of cooling function for waste storage tanks due to a total loss of AC power persisting over a long period of time at fuel reprocessing facilities. Some amounts of radioactive materials could be released from facilities by vapor flow from a boiling liquid waste storage tank. Thermal-hydraulic behavior of water and nitric acid vapor and aerosol behaviors in compartments of facility building are needed to be analyzed for assessing amount of released radioactive materials to outside of facilities. The amount of water and nitric acid vapor, which is one of key parameters to estimate the duration of evaporation to dryness and the amounts of transferring radioactive materials, is calculated based on the liquid/vapor equilibrium data of liquid wastes. This report described the experiment details and its results to obtain the equilibrium data of multicomponent nitrate solution.