[16a-WL2_301-1~9] 3.7 Optical measurement, instrumentation, and sensor

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[16a-WL2_301-8] Compact Raman lidar for gas leak detection in nuclear reactor building

〇Tatsuo Shiina¹, Moe Ishii¹, Shinri Kurahashi², Toshihiro Somekawa², Shohei Matsuda³, Hiroaki Kuze⁴ (1.Chiba Univ., 2.Inst. Laser Tech., 3.JAEA, 4.Chiba Univ. CEReS)

Keywords:

Raman Lidar,nitrogen gas,Nuclear power

At the Fukushima Daiichi Nuclear Power Plant, an inert atmosphere is maintained inside the reactor containment vessel by nitrogen filling; however, it has become necessary to investigate nitrogen leakage points within the high-radiation building. In this study, a compact Raman lidar system was developed for the purpose of detecting gas leaks inside the reactor building, and the performance characteristics of leak gas detection were evaluated. The device's performance was assessed, including detection limits for gases such as nitrogen and oxygen concentration changes in the atmosphere, as well as other gases like water vapor, and attempts were made to understand and visualize the spatiotemporal distribution of the leaked gases.