The improvement of defect detection and sizing capabilities for nondestructive inspection technique has been required in order to ensure the reliable operation and life extension of nuclear power plant . Immersion phased array UT technique which is not affected the surface geometry of welds has been developed for inspection of BWR internals such as shroud, shroud support, and so on. Furthermore, thin -type array probe was developed and was examined in UT of core spray piping welds in the narrow region betw...
英字タイトル:
Application of Phased Array UT on BWR Reactor Internals Piping

1．はじめに近年、ロボット技術の進歩に伴って、従来実現できなかった遠隔作業が可能になり、特に水中や狭隘部において、高度な検査、補修、予防保全が実用化されている。本稿では、当社の遠隔操作装置（保全ロボット）の開発と実機適用に関する現状の取り組みと今後の展望について述べる。当社は、1980年代より、定期検査時の時間短縮、作 業員の被曝低減、安全性向上のために、原子燃料や制御棒駆動機構の自動交換技術や格納容器内の運転中監視システムなどを開発して、実機適用を図ってきた。1990年代に入り、原子力発電プラントの炉内......

Abstract This paper describes development and application of remotely operated vehicles (ROVs) for reactor internals. Stress Corrosion Cracking (SCC) on reactor internal comp onents has become one of the most important issues in recent years, and demand for the inspection of reactor internals is increasing. Toshiba has developed and applied sever al kinds of ROVs, which can inspect and maintain the welds in a narrow space underwater. Particularly, Toshiba succeeded in the development of UT Vehicle, which c...
英字タイトル:
Development and Application of In-Vessel Inspection Equipments