DPA calculation for Japanese spallation neutron source

A neutron generating target and surrounding components, such as moderators and proton-beam windows, of intense pulsed spallation sources suffer serious radiation damage. In order to construct a maintenance scenario of the Japanese Spallation Neutron Source, the life estimation of those components due to the radiation damage becomes indispensable. For this purpose, we calculated DPA values of the important components, based on the calculation of displacement cross-sections using PHITS and NJOY codes with the LA150 library. Maximum DPA values at the end of 5000 MW h are 3.9 for the target vessel, 2.8 for the reflector and moderator vessels, and 0.4 for the proton-beam window. We also discuss the effect of the proton-beam profile and proton-energy dependence on the DPA values. Briefly, we showed the calculation result on the helium and hydrogen production.