Engineering validation for lithium target facility of the IFMIF under IFMIF/EVEDA project

•The major progress of engineering validation activities in the IFMIF/EVEDA project joined by Japan and the EU was a verification of long-term stability of high-speed liquid lithium target flowing for fusion neutron source.•Successful completion and achievement exceeding the goal of the full scale test of the high-speed liquid lithium flow for the fusion neutron source under the Broader Approach Activities aiming at the early realization of fusion energy jointly developed by Japan and the EU.•The verification of the long-term stability of over the 1300h high-speed liquid lithium target flow beyond the goal of 1000h, using the test facility having the world's highest flow rate, and the verification of lithium purification and safety and the remote handling technique using fiber laser for the welding and cutting of the pipes were also performed.