[3J03-07] Improvement of Safety at Reprocessing Plant

[3J07] Study on ruthenium volatilization during evaporation and dryness of nitrate solution

Reduction of formation of volatile ruthenium tetroxide by sucrose addition

*Tetsuya Kato¹, Tsuyoshi Usami¹, Takeshi Tsukada¹ (1. CRIEPI)

Keywords:High level liquid waste, Ruthenium, Volatilization, Loss of coolant function

In a cooling malfunction accident of a high-level liquid waste (HLLW) tank, part of radioactive ruthenium (Ru) is potentially released to the environment as volatile RuO₄. In this study, sucrose was added as reductant into a simulated HLLW containing Ru, and the gases of RuO₄, NOx and CO₂ evolved during the dryness and denitration up to 1073 K were measured by means of the mass spectrometer and the FT-IR.