J-PARC LBE spallation target for ADS development

Sasa, Toshinobu   ; Saito, Shigeru   ; Obayashi, Hironari  ; Ariyoshi, Gen  ; Wan, T.*; Okubo, Nariaki   ; Ohdaira, Naoya*; Yamaki, Kenichi*; Kita, Satoshi*; Yoshimoto, Hidemitsu*

Japan Atomic Energy Agency (JAEA) proposes to reduce the minor actinides by Partitioning and Transmutation Technology using Accelerator-driven system (ADS). To realize ADS, JAEA plans to locate Lead-Bismuth Eutectic alloy (LBE) spallation target in J-PARC. LBE spallation target will be used to solve technical issues for ADS design by preparing irradiation database. The 400 MeV - 250 kW proton beam can be used for ADS studies. The spallation target is optimized by thermal-hydraulic analysis and structural analysis to increase proton/neutron irradiation of ADS materials by sharply focused proton beam injection. The studies for elemental technologies such as a fully-remote target exchange procedure and freeze-sealed drain valve system are also performed and integrated into the design of LBE target. The latest design of the J-PARC LBE spallation target system will be presented.