It was determined that the tensile properties of HIP joints were almost the same as those of stainless-steel base material irrespective of neutron irradiation. The difference in surface roughness condition and total elongation of irradiated type-C joints was smaller than that of the other types of joints, but the tensile strength of HIP joints was not changed by the surface roughness condition.
This study confirmed that the tensile strength of HIP joints by the standard HIP condition was almost the same as that of the base material after neutron irradiation, and that it is possible to alleviate the requirement on surface roughness condition for HIP joining as part of the ITER blanket fabrication.