Carrier and bore tools for 4 in. bent pipes

Following the ALARA principle, remote handling techniques are developed for ITER maintenance to prevent direct hands-on access on the vacuum vessel components and reduce the personal dose rate. Maintenance of the divertor cassettes will require cutting, welding and non-destructive testing of the water-cooling-pipes. Work performed under the EFDA work program aimed to demonstrate the feasibility to operate with bore tools by means of an innovative carrier concept and to study the associated mechanisms. This paper presents a carrier designed to navigate through 4 in. bent pipes and the results of the test campaigns on the prototypes.