Effects of impurities on low activation characteristics of V–4Cr–4Ti alloy

The required control levels of various impurities such as Co, Nb, Ag, Mo, Al, Na, Ni, Cu, Fe, Si, etc. in vanadium alloy (V–4Cr–4Ti) are given considering the hands-on and remote recycling dose rate limits based on the irradiation neutron spectrum of fusion reactor first wall. The activation level of the vanadium alloy (NIFS-HEAT-2 ingot) currently made by National Institute for Fusion Science (NIFS, Japan) is calculated and compared with the activation levels of previous NIFS-made vanadium alloy (NIFS-HEAT-1) and the USA-made vanadium alloy (US832665).