[2I01-05] Waste Management 1

[2I01] α-emitting nuclides analysis of the stagnant water including sediments in Fukushima Daiichi NPS

(1) α-emitting nuclides in the stagnant water at the unit 3 reactor of Fukushima Daiichi NPS

Kazuki Ouchi¹, *Toshitaka Oka¹, Takumi Yomogida¹, Shiori Morii¹, Yoshihiro Kitatsuji¹, Yoshikazu Koma¹, Katsuhiro Konno² (1. JAEA, 2. TEPCO HD)

Keywords:Fukushima Dai-ichi Nuclear Power Station, Stagnant water, ICP-MS, particle

To understand the existence of α-nuclides in the particulate solids contained in the stagnant water in the unit 3 reactor of Fukushima Daiichi Nuclear Power Station, the stagnant water was classified by particle size using filters with pore diameters of 10, 1, 0.1, and 0.02 μm, and U and Np concentrations in the solid fraction and filtrate were investigated using ICP-MS. Both nuclides were present in large particles larger than 10 μm, and some were present in the stagnant water on fine particles or ions smaller than 0.02 μm.