Development of tritium production measurement method for in-pile tests of fusion blanket in the JMTR

The specialized tritium-measuring system was developed. The amount of tritium production in tritium monitors (Li–Al alloy and LiAlO2 pebble) irradiated in the JMTR was calculated by using the Monte Carlo code MCNP and was measured by using the measuring system. The amount of measured tritium values was 66.5–150 MBq per tritium monitor. Almost all the amount of tritium production in the tritium monitor was trapped by the measuring system. The ratios of calculated to measured amount of tritium productions was 0.99–1.08. The applicability of tritium monitors and the specialized tritium-measuring system for fusion blanket in-pile tests was confirmed by this study.