Structure analysis of LBE spallation target for accelerator driven system in JAEA; Effects of pressure waves on the structural integrity of target vessel

Wan, T.; Kogawa, Hiroyuki  ; Iwamoto, Hiroki   ; Takei, Hayanori   ; Obayashi, Hironari  ; Sasa, Toshinobu   ; Naoe, Takashi   ; Futakawa, Masatoshi  

Japan Atomic Energy Agency (JAEA) has proposed an accelerator-driven system (ADS) for nuclear transmutation, which possesses a Lead-Bismuth Eutectic (LBE) target/coolant system with an LBE enclosure vessel. To solve basic technical issues related to the ADS design, the construction of Transmutation Experimental Facility (TEF) including the ADS Target Test Facility (TEF-T) has been proposed within the framework of Japan Proton Accelerator Research Complex (J-PARC) project. In the TEF-T, the LBE spallation target will be installed, and be bombarded by pulsed proton beams (400 MeV, 25 Hz, 0.5 ms in pulse duration). The target vessel suffers the static stress caused by design pressure and thermal stress due to heat deposition owing to the spallation reaction. To assess the structure integrity of target vessel, the pressure waves generated in LBE, which caused by rapid temperature rising due to the bombardment of pulsed proton beam, should be considered. On the basis of the results of neutronic and thermal-hydraulic analyses, the effects of pressure waves on the structural integrity of target vessel were studied through the dynamic analyses in the present study. The structural integrity of the LBE enclosure vessel for the TEF-T target was assessed.