Development of traveling miniaturized radiographic testing vehicle ('TMRTV')

Hitachi has developed the traveling miniaturized radiographic testing vehicle ('TMRTV'), and succeeded in applying it to inspect the pipe of the actual plant which is the first time in Japan. Periodical measurement of pipe wall thickness is required as preventive maintenance activity in nuclear power plant. However, it is difficult to inspect pipe which place at like narrow space. The newly developed 'TMRTV', (134 mm width x 515 mm length x 242 mm height) can go through narrow space with magnetic type wheel and measure pipe wall thickness by high sensitivity Radiographic Test(RT) device. TMRTV' made possible to measure the pipe wall thickness which was difficult in the past. Early this year, we applied the 'TMRTV' to the actual RPV bottom drain line in Japan, and demonstrated possibility of accurate and reliable measurement. (author)