抄録
The Japan Atomic Energy Researc Institute (JAERI) and the High Energy Accelerator Research Organization (KEK) are promoting a project to construct a neutron scattering facility at the Tokai Research Establishment, JAERI, under the High-Intensity Proton Accelerator Project (the JAERI/KEK Joint Project). In the facility, 1 MW pulsed proton beam (3GeV, 0.333mA, 25Hz) from a high-intensity proton accelerator will be injected into a mercury target in order to produce high-intensity neutrons. A cross flow type (CFT) mercury target has been designed in order to distribute mercury flow according to an axial heat generation distribution caused by spallation reaction. The maximum mercury temperature in the CFT target and maximum target vessel temperature were calculated to be 104℃ and 149℃, respectively, under conditions of the inlet temperature 50℃ and mercury flow rate 40.7m^3/h. These results show that each value was less than the maximum design temperature of 200℃. Furthermore, maximum stress appeared in the target vessel, which was a sum of stresses caused by inner pressure, temperature differences between inner and outer vessel, pulsed pressure wave, was calculated less than the allowable design stress of 345 MPa.
