Affiliations: Japan Atomic Energy Agency, Sector of Fast Reactor Research and Development, Fukui-ken, Japan
Correspondence:
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Corresponding author: Toshihiko Yamaguchi, Japan Atomic Energy Agency, Sector of Fast Reactor Research and Development, 1 Shiraki, Tsuruga-shi, Fukui-ken 919-1279, Japan. Tel.: +81 770 39 1031; E-mail:yamaguchi.toshihiko@jaea.go.jp
Abstract: The paper presents application of a multi-coil eddy
current testing (ECT) system to detect defects in steam generator (SG) tubes
of Fast Breeder Reactors (FBRs). The defects are located near SG tube support
plates. The SG tubes were immersed in liquid sodium at temperature above 500°C
and then drain several times. Three dimensional (3D) Finite Element
Method (FEM) numerical simulations, using an in-house developed code, are
validated with experimental measurements in both cases of absence or
presence of sodium on the outer SG tubes surfaces. Validations of FEM
simulations of multi-coil ECT system with experimental measurements, for
helical tubes, are conducted for a large model of SG tubes support plate and
three SG tubes attached to it.
Keywords: SG tubes, RF-ECT, multi-coil sensor, support plate, sodium
