Three years after the Fukushima disaster prompted the closure of all of Japan's nuclear reactors, Prime Minister Shinzo Abe is moving to revive atomic power as a core part of the nation's energy mix, but many of those idled reactors will never come back online.

Fewer than one-third, and at most about two-thirds, of the reactors will pass today's more stringent safety checks and clear the other seismological, economic, logistical and political hurdles needed to restart, a Reuters analysis shows..

Hokkaido Electric Power Co., facing a third year of financial losses, is seeking a capital infusion from a state-owned lender, which would make it the second utility after Tokyo Electric Power Co., whose Fukushima No. 1 plant suffered three core meltdowns, to get a government bailout since the March 2011 disaster started.