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Report No.

Proposal of estimation method for liquid/vapor equilibrium of multicomponent nitrate solution

Yoshida, Kazuo ; Abe, Hitoshi 

Boiling accidents of reprocessed liquid wastes at fuel reprocessing facilities are postulated to occur by the loss of cooling function for waste storage tanks due to a long-term total loss of AC power. Some amounts of radioactive materials could be released from facilities by vapor flow from a boiling liquid waste storage tank. The amount of water and nitric acid vapor, which is one of key parameters to estimate the duration time of evaporation to dryness and the amounts of radioactive materials transferring from liquid to vapor phase, is calculated based on the liquid/vapor equilibrium data of liquid wastes. This report discusses on the relationship between degrees of boiling point, nitrate salt mole fraction, and the liquid/vapor equilibrium of single component non-volatile nitrate solution. A estimation method is proposed of liquid/vapor equilibrium of multicomponent nitrate solution simulating reprocessed liquid wastes.



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