Sizing Capabilities of Crack for the Inspection of PWR RV Head Penetrations
松本 博 Yoshihiro MATSUMOTO 勝又 俊介 Ryosuke KATSUMATA 田中 昌幸 Masayuki TANAKA 泉田 博幸 Hiroyuki IZUMIDA 原田 豊 Yutaka HARADA 村上 龍兒 Ryuji MURAKAMI
Eddy Current TestingInspectionPWRRV Head PenetrationUltrasonic Testing
This paper describes the result of demonstration test using WesDyne International's inspection system in terms of its sizing capability of crack from the inner diameter (ID) of PWR RV head penetrations, detectability of the crack e mbedded under repair welding, which was applied for isolation from the primary water environment, and the propagation of ultrasonic wave from the ID penetration to the inside of J-weld. The result of the laboratory tests have demon strated the sizing capabilities of both ultrasonic testing (UT) using time-of-flight diffraction (TOFD) techniques and eddy current testing (ECT). It has been demonstrated that these crack sizing techniques are applicable to the e xamination of RV head penetrations at an actual plant with a sufficient level of accuracy. Furthermore, detectability of the crack embedded under repair welding and propagation of ultrasonic wave inside of the J-weld was confirmed.