Author: Dobashi, K.
Paper Title Page
THPWA010 Application of X-band 30 MeV Linac Neutron Source to Nuclear Material Analysis for Fukushima Nuclear Plant Accident 3648
  • M. Uesaka, K. Dobashi, T. Fujiwara
    The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
  • H. Harada
    JAEA, Ibaraki-ken, Japan
  • K. Tagi
    University of Tokyo, Tokyo, Japan
  • M. Yamamoto
    Accuthera Inc., Kawasaki, Kanagawa, Japan
  We plan to use our X-band (11.424GHz) electron linac as a neutron source for the nuclear analysis for the Fukushima nuclear plant accident. Quantitative material analysis and forensics for nuclear security will start several years later after the safe settlement of the accident is established. For the purpose, we should now accumulate more precise nuclear data of U, Pu, TRU and MA especially in epithermal (0.1-10 eV) neutrons. Therefore, we have decided to move the linac into the core of the experimental nuclear reactor “Yayoi” which is now under the decommission procedure. First we plan to perform the TOF (Time Of Flight) transmission measurement of the total cross sections of the nuclei for 0.1-10 eV neutrons. Electron energy, macro-pulse length, power and neutron yield are ~30 MeV, 100 ns – 1 micros, <0.5 kW and <1012 n/s, respectively. Optimization of the design of a neutron target (Ta, W, U), TOF line and neutron detector (Ce:LiCAF) of high sensitivity and fast response is underway. Installation, commissioning and measurement starts in 2014. Detailed design and way how to contribute to the analysis of the Fukushima nuclear plant accident will be presented.