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

Koizumi, Mitsuo ; Kitatani, Fumito  ; Harada, Hideo   ; Takamine, Jun ; Kureta, Masatoshi  ; Seya, Michio; Tsuchiya, Harufumi ; Iimura, Hideki  

The melted fuel (MF) of the Fukushima Daiichi Nuclear Power Plant of the Tokyo Electric Power Company will be taken out to dismantle the reactors. At that time, quantification of nuclear materials (NM) in the melted fuel (MF) is probably required. Quantification of NMs in debris is, however, considered to be difficult because of their variety of size, shape and unknown compositions. Consequently, quantification methods have not been established so far. In this paper, we propose a method, neutron resonance densitometry (NRD), for quantification of NMs in particle like debris of MF. Techniques of neutron resonance transmission analysis (NRTA) and neutron resonance capture analysis (NRCA) or prompt ray analysis (PGA) are combined. A time of flight (TOF) system is introduced for the measurements.