Flotation pontoon device and aerify drainage system

The utility model discloses a flotation pontoon device, including the barrel that is hollow structure, be equipped with its hollow structure's of intercommunication water inlet, gas outlet on the barrel, and the bottom of barrel is equipped with its hollow structure's of intercommunication delivery port, the water inlet is used for connecting with spentnuclear fuel storage and transportation container, and spentnuclear fuel storage and transportation container discharged water is discharged through the delivery port, and spentnuclear fuel storage and transportation container combustion gas is discharged through the gas outlet. Because spentnuclear fuel storage and transportation container discharged water need not pass through deareator and directly emit into spent fuel pool, has reduced deareator's work load, effectively prolongs its life, the water droplet that splashes can not pollute other places by the spill, and the simple structure of this flotation pontoon device owing to the flotation pontoon device