FEM comparisons between RF-ECT signals in quasi-static or transient and linear or nonlinear regimes; ECT probe speed effect for in-service inspection of magnetic SG tubes in FBR

リモートフィールドECTにおける準静的、過渡的、線形・非線形性のFEM解析比較高速炉の強磁性蒸気発生器伝熱管の供用期間中検査のためのECTプローブの走査速度の影響

Garcia Rodriguez, D.; Mihalache, O. ; 上田 雅司 

Garcia Rodriguez, D.; Mihalache, O.; Ueda, Masashi

Two-dimensional axis-symmetric finite element method (FEM) simulations are conducted to study remote field eddy current testing (RF-ECT) in ferromagnetic steam generator (SG) tubes for fast breeder reactors (FBR). The present work investigates a combination of quasi-static and transient analysis with both linear and non-linear material properties. Two FEM codes are employed: a commercial one based on COMSOL and a 2D-FEM code developed in-house. Both codes are used to evaluate the influence of the speed of the ECT probe during in-service inspection of SG tubes at a low excitation frequency. As a result, the maximum error in SG tube defect detection when using the classical linear and quasi-static approximations is obtained.