Proposal of neutron resonance densitometry for particle like debris of melted fuel using NRTA and NRCA

Harada, Hideo   ; Kitatani, Fumito  ; Koizumi, Mitsuo ; Tsuchiya, Harufumi ; Takamine, Jun ; Kureta, Masatoshi   ; Iimura, Hideki  ; Seya, Michio; Becker, B.*; Kopecky, S.*; Schillebeeckx, P.*

The neutron resonance densitometry (NRD) has been proposed to quantify of nuclear materials in particle-like debris of melted fuel formed in severe accidents of nuclear reactor such as Fukushima Daiichi Nuclear Power Plants; the NRD is a combined method of NRTA (neutron resonance transmission analysis) and NRCA (neutron resonance capture analysis) using a pulsed neutron generator and a neutron TOF (time of flight) technique. The presentation includes the proposed NRD concept, its principle, and preliminary analytical studies on achievable accuracies. The research plan on the feasibility study of the NRD will be also shown, which has been started since 2012 JFY.