> Is there any progress in design of nuclear fission power plants regarding safety?

> Fukushima...

You mean, hit by the most powerful earthquake recorded in Japan, flooded by a tsunami with 13-14 meter-high waves, evacuated, failed to shutdown, had three core meltdowns and several explosions, and resulted in... 1 death from radiation, 2000 deaths from evacuation and 45 radiation-resulted injuries.

I'd say even this outdated design was very, very, very safe.