Japan is set to win approval to discharge more than a million cubic meters of treated water from the Fukushima nuclear disaster site into the Pacific Ocean, a contentious plan that’s soured ties with neighbors including China. The International Atomic Energy Agency’s Director General Rafael Grossi will visit Japan from Tuesday to deliver a final report on the safety of the process and meet with officials including Foreign Minister Yoshimasa Hayashi. A domestic nuclear regulator is also set to issue a crucial assessment.