[2H11-15] Non-destructive Inspection

[2H11] Development of in-pipe exploration technology in high background radiation environment

(1) Research design

*Tatsuo Torii¹, Yukihisa Sanada², Yuki Morishita², Shunsuke Kurosawa³, Takahiro Hayashi⁴, Takahide Sakagami⁵, Shohei Kodama⁶ (1. University of Fukui, 2. JAEA, 3. Tohoku University, 4. Osaka University, 5. Kobe University, 6. Saitama University)

Keywords:decommissioning, radiation imaging, in-pipe exploration

In the decommissioning of Fukushima Daiichi Nuclear Power Plant, nondestructive inspection of piping inside and outside the facility and inspection of internal contamination after pipe removal are important issues. In this study, we plan to conduct elemental research on non-destructive pipe inspection techniques using lasers and thermography, imaging techniques for low-energy γ-rays emitted from U and Pu, and high-energy γ-ray detection techniques assuming a high background environment. In addition, a three-year plan includes the development of a simple hydrogen gas detection method, the development of a detection system that enables discriminative measurement of α, β and γ-ray, and the matching of a robot that will serve as a platform for installing the detection system, assuming the inspection of internal contamination after the removal of pipes. This series of presentations will introduce some of the results of this year's project.