Method and system for inspection of inside of nuclear reactor vessel

A method for inspection of the inside of a nuclear reactor vessel comprising the steps of:

• controlling a movement of an inspection device for inspecting a defect in a nuclear reactor vessel by a drive/control device to permit inspection of a part to be inspected in said nuclear reactor vessel by said inspection device;
• determining the presence or absence of said defect in said nuclear reactor vessel based upon information from said inspection device in the course of said movement of said inspection device;
• pursuing and monitoring said movement of said inspection device by monitor means for monitoring said movement of said inspection device;
• suppressing said movement of said inspection device by said drive/control device when the presence of an abnormality in said movement of said inspection device is determined based upon information from said monitor means, to avoid said abnormal movement;
• and
• performing a defect detecting operation by brushing said part to be inspected in said nuclear reactor vessel by a brushing unit for brushing said part to be inspected with said controlled movement of said inspection device, said brushing unit being included in said inspection device, applying a defect detecting fluid to said part to be inspected by a defect detecting fluid applying unit with said controlled movement of said inspection device, said defect detecting fluid applying unit being included in said inspection device, and detecting said defect in said part to be inspected by a visual testing unit with said controlled movement of said inspection device, said visual testing unit being included in said inspection device.