Recent progress in research and development on the neutron resonance densitometry for particle-like debris of melted fuel

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

In this contribution, progress made in the development of NRD for the characterization of nuclear materials mixed with highly radioactive nuclides is presented, together with the basic concept and principles. The use of a special -ray spectrometer for NRCA and an evaluation of the achievable accuracy are discussed. The discussion is based on results of Monte Carlo simulations combined experimental data from measurements carried out at GELINA. In addition, a prototype compact NRD system, which will be installed at the JAEA Tokai-site, has been designed and is presented. Other results, such as the impact of the particle size and nuclear data, are presented in other contributions to this symposium.