[3C06-09] Various Decommissioning Technology

[3C08] Proposed final disposal site in deep sea (part 2)

課題と問題点を整理

*Yasufumi Kitamura¹, Haruo Morishige¹, Yosuke Yamashiki², Makito Watakabe¹, Haruki Morishige¹ (1. Fukushima Nuclear Accident Countermeasures Review Group, 2. Kyoto Univ.)

Keywords:Final Disposal site, Deep sea

We announced the plan to set the deep sea as a final disposal site at the 2018 Atomic Energy Society fall meeting. Last time I presented a brief construction method to set tanks made of gigantic concrete in the deep sea. In this issue, we describe the disposition of the waste in the tank and the levitating mechanism, and also arranged the issues and problems. Corrosion of concrete and inundation rate of seawater is the problem first. Examination of previous literature on concrete salt damage revealed that when the salt damage advanced, the reinforcing bars corroded and expanded and the concrete was destroyed. However, this structure is a concrete tank reinforced with fiber sheet which does not use rebar, it does not hit this. On the contrary, I learned that even if concrete had initial cracks, salt water had the effect of cracking. The inundation rate per 100 years is assumed, but I will also post about that idea.