The Japanese government has ordered electricity firms to inspect their nuclear power plants in the wake of yesterday's accident in which four workers were killed.
In Japan's deadliest nuclear industry accident, super-heated steam escaped from a ruptured pipe in a building housing turbines for a reactor at the Mihama nuclear power plant.
The plant is located 200 miles west of Tokyo.
There was no radiation leak, but the accident has raised concerns about Japan's nuclear safety record.
