R&D of breeding functional components in ITER-TBM, 3; Prediction accuracy of the tritium production rate in TBM-simulating mockup with neutron reflector

Kondo, Keitaro; Ochiai, Kentaro; Tatebe, Yosuke; Yagi, Takahiro*; Takakura, Kosuke; Onishi, Seiki; Sato, Satoshi; Konno, Chikara  

In a previous neutronics experiment with a Li-enriched LiTiO layer and a beryllium layer simulating the ITER test blanket module conducted at the FNS facility of Japan Atomic Energy Agency, the calculated tritium production rate (TPR) was by approximately 10% larger than the measured one only when a neutron source reflector composed of SS316 was attached. In order to clarify whether the deterioration of the TPR prediction accuracy originates from the reflector or not, we have conducted the same experiment as the previous experiment again and the detailed analysis of the experiment. In the present experiment, the measured TPR distribution inside the Li-enriched LiTiO layer well agreed with the calculated one within an estimated experimental error of 6%. We conclude that the overestimation of TPR observed in the previous experiment would be due to some experimental errors and that the TPR prediction accuracy is good even in the case with the reflector.