Transfer and removing method and device for deposition on pipe surface

The transferring/removing device of the present invention comprises linear magnets in a combination of a plurality of electromagnets for generating mobile magnetic fields in the axial direction of a tube and high frequency AC magnetic field-generation magnets disposed at the top end of the linear magnets. Theses magnets are inserted into the tube to generate mobile magnetic fields using the linear magnets. Ferromagnetic materials such as iron oxides in the deposits in the periphery of the surface of the tube are magnetized to provide a granulating effect of causing the materials to attract each other and peel them off from the surface of the tube. Then, they are transferred toward the exit of the tube by the magnetic fields. High frequency AC magnetic fields are generated by the high frequency AC magnetic field generation magnets to remove residual magnetism in the ferromagnetic materials. The deposits are disintegrated and scattered, mixed into reactor coolants and removed along with the circulation of the coolants. With such procedures, the deposits such as radioactive corrosion products can be efficiently removed from narrowed portions. (I.N.)