Inspection method and apparatus for piping
AssigneeHitachi, Ltd.
InventorsYuuichirou Mizumachi, Makiko Miyauchi, Masakazu Hisatsune, Fuminobu Takahashi
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Abstract
Nuclear fuels are taken from a nuclear reactor pressure vessel, a rail for running is mounted under the reactor pressure vessel drain piping in parallel with a horizontal portion of the reactor pressure vessel drain piping inside a pedestal positioned on the lower side of the reactor pressure vessel, an inspection apparatus is mounted on the-rail, and the inspection apparatus is moved along the rail to inspect the reactor pressure vessel drain piping, whereby the reactor pressure vessel drain piping can be surely inspected while reducing radiation exposure to an inspector.
Claims5
In combination with a nuclear reactor pressure vessel, said nuclear reactor vessel being positioned in a pedestal, reactor pressure vessel drain piping being positioned on the bottom of said nuclear reactor pressure vessel, an inspection apparatus for piping, said inspection apparatus for piping comprising:
- a carriage set on a rail arranged under said reactor pressure vessel drain piping in parallel with a horizontal portion of said reactor or pressure vessel drain piping inside a said pedestal;
- a driving means for moving said carriage along said rail;
- a falling prevention mechanism for preventing said carriage from falling from said rail;
- a camera mounted on said carriage and monitoring a relative position between said camera and said reactor pressure vessel drain piping;
- and
- a thickness measuring means mounted on said carriage for measuring the thickness of said reactor pressure vessel drain piping.
Dependencies are inferred from the claim text.