Challenge towards quantification of SNM from Fukushima Daiichi by NRD

Harada, Hideo   ; Koizumi, Mitsuo ; Tsuchiya, Harufumi ; Kitatani, Fumito  ; Seya, Michio; Becker, B.*; Heyse, J.*; Kopecky, S.*; Paradela, C.*; Schillebeeckx, P.*

A new concept named as neutron resonance densitometry (NRD) has been proposed by JAEA to quantify the amounts of special nuclear materials included in samples with unknown elemental and isotopic composition, such as melted fuel debris generated in severe accidents of nuclear reactors such as Fukushima Daiichi. JAEA and JRC-IRMM has started the international collaboration on the feasibility study aiming at development of a quantifying technique of nuclear materials by a non-destructive method NRD. The highlights of the significant results such as detector development, validation measurements using a U sample and a heterogeneous sample, the advanced analysis method are presented together with the concept of the NRD.