TBM as a test body for the assessment of neutron and tritium, and its problems

Kawamura, Yoshinori

The most important subject in the ITER-TBM test program is the estimation of TBR based on the information of neutron entered into TBM and of tritium recovered from TBM, and is the showing good prospect of TBR for DEMO. To discuss TBR estimation method in TBM test program, JAEA is carrying out the tritium generation and recovery experiments using simulated blanket at Fusion Neutron Source facility (FNS). At FNS, more accurate TBR estimation is possible by the comparison among the amount of calculated tritium generation, observed tritium generation, and tritium recovery. In the case of TBM, the neutron estimation is not so easy, because neutron source is a heterogeneous plasma having volume, and the plasma is generated in the form of pulses. So, TBR estimation in TBM program will need more effort.