Abstract
Abstract Remote-controlled in-service inspection (IS1) equipment has been developed for inspecting the pressure tubes (117.8mm I.D., 4.3mm thickness, 4.8m length, made of Zr alloy) of the Fugen, which is a heavy-water-moderated, boiling-light-water-cooled pressure-tube-type reactor. The equipment is capable of performing three kinds of inspection; ultrasonic flaw detection, measurement of inside diameter and cross-sectional form, and visual inspection of the internal surface. A system mock-up was prepared using facilities outside the reactor; the test results were: (1) Detection of a flaw of 5.0 mm (L) x0.06 mm (W) ×0.05 mm (D) with S/N=15 dB (2) Inside diameter measured to ±15 µm for water temperatures of 10–407°C (3) Identification of a 2.0 mm (L) x0.1 mm (W) ×0.1 mm (D) flaw (4) Under a radiation level of 3×105 R/h (Gamma), the system was confirmed to be reliable for 80 h of operation. This equipment was used for inspecting of 15 pressure tubes in September 1989 during the 8th annual inspection of Fugen, and the inspection was finished on schedule.
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