Author: Fujiwara, T.
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.