Status of technology development for the non-destructive assay of Pu in spent fuel using nuclear resonance fluorescence with monochromatic -rays

Hajima, Ryoichi; Sawamura, Masaru; Nagai, Ryoji; Nishimori, Nobuyuki; Hayakawa, Takehito; Shizuma, Toshiyuki; Kikuzawa, Nobuhiro ; Fujiwara, Mamoru; Seya, Michio

We have proposed a nondestructive assay for Pu-239 in spent nuclear fuel assembly under water using nuclear resonance fluorescence with energy tunable monochromatic -rays generated by Compton scattering of laser photons and high energy electrons. By using -ray beams of energy of about 2 MeV with good penetrability, one can detect Pu-239 in a spent fuel assembly kept in a water pool from outside the pool wall. In order to realize such -ray source, we are developing technologies for energy-recovery linac (ERL), which is able to generate small-emittance and high-current electron beams. Here we report development status of an electron gun, superconducting cavity and also we present a design of high-flux -ray source based on an ERL.