| 摘要 |
PURPOSE:To effectively and surely eliminate an adhering substance irrespective of a shape and length of a pneumatic tube by bringing dry ice grains to pneumatic carrying into the pneumatic tube with regard to a method for eliminating nuclear fuel powder such as plutonium, etc., adhering to the inside of the tube. CONSTITUTION:At the time of pneumatic carrying of nuclear fuel substance powder 1, powder 1 in a glove box A is brought to pneumatic carrying to a cyclone 3 in a glove box B, in which a solid-gas separation is executed, and only the solid powder 1 is collected in a hopper 4. This pneumatic carrying is executed by setting the pneumatic tube 2, the cyclone 3 and the hopper 4 to negative pressure by a blower 5 in a glove box C. Also, in this process, the powder 1 adheres or it is stagnant onto the inside surface of the pneumatic tube 2, the inside surface of the cyclone 3, the inside surface of the hopper 4, and the surface of a filter 6. Therefore, instead of the powder 1, dry ice grains are brought to pneumatic carrying into the pneumatic tube 2 in the same way, and by its impact force, the powder is peeled off and eliminated effectively. Its specific gravity is 1.56 and its hardness is low and no damage is given to an apparatus, etc. |
