[2J06-09] Criticality Safety

[2J08] Development of the insoluble neutron absorbers using self-assembled surfactant aggregates

(3)Evaluation of radiolytic products

*Noriaki Ushio¹, Hiroyuki Terazaki¹, Kouji Koyanagi¹, Norikazu Jin¹, Toshio Hayashi¹ (1. Kao Corporation)

Keywords:Insoluble neutron absorbers, Surfactant, Viscotop, Worm-like micelles

For the purpose of removing fuel debris from the Fukushima-Daiichi Nuclear Power Plants safely and smoothly, we are developing a re-criticality prevention technology using insoluble neutron absorbers. We have found out that high viscosity fluid insoluble in the water which can hold B₄C particles stably by using the VISCOTOP (complex of alkyl aryl sulfonate and alkyl ammonium salt). VISCOTOP which forms self-assembly surfactant aggregates known as a worm-like micelle, is predicted to generated various degradation products by radiolysis. This time, we tried to evaluate the safety and the effect on the substrate material by performing qualitative and quantitative measurement of the radiolyzate.