Plans are being drawn up to rate Japan's nuclear power plants for safety to better monitor risk-prone plants and reduce inspection costs.

The Nuclear and Industrial Safety Agency said the new policy marks a turning point in its safety monitoring system. In the past, equal weight has been given to all nuclear power plants on the question of ensuring safety.

Under the new policy, all plants will be rated in terms of their operating performance, including radiation management and the number of failures at reactors, officials said.