Development of electromagnetic non-destructive testing method for the inspection of heat exchanger tubes of Japan Sodium-cooled Fast Reactor, 2; Detection of flaws on the inner surface using electromagnetic waves

JSFR伝熱管のための電磁非破壊検査法の開発,2; 電磁波による管内面欠陥の検出

佐々木 幸太*; 遊佐 訓孝*; 若井 隆純 ; 橋爪 秀利*

Sasaki, Kota*; Yusa, Noritaka*; Wakai, Takashi; Hashizume, Hidetoshi*

This study reports evaluations of applicability of a microwave nondestructive testing method for a flaw inside heat exchanger tubes in JSFR, which is a straight long-range tube whose diameter is 11.0 mm. Design of microwave probe profile on the basis of numerical simulations on transmission characteristics at the probe are carried out and the plate-structure microwave probe which enables to largely introduce microwaves into a pipe is confirmed. Experimental evaluations using straight brass pipe whose diameter and length are 11.0 mm and 12.0 m, respectively, reveal that good agreement between predicted location of a flaw and true locations.