Abstract
A helical-coil-type double wall tube filled with a wire mesh layer is proposed for a steam generator (SG) of a new-type fast-breeder reactor in Japan in order to further increase reliability in operation. This double wall tube consists of inner and outer tubes and a wire mesh layer between inner and outer tubes. In last fiscal year, following 2 R&D projects were planned and established. An in-service inspection (ISI) technology is required to put this double wall tube SG to practical use. We need to detect small defects on an outer surface of an outer tube during an insert of a sensor into an inner tube. A major candidate for this inspection is a remote field eddy current testing (RFECT). An objective of this development is to demonstrate a defect detection of a double wall tube with a wire mesh layer using a RFECT. In order to connect tubes for helical-coil length, we designed and made prototype welding device unit, executed survey welding examination and evaluated applicability by the test piece examination
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