The two nuclear reactors currently in operation in Japan have no serious safety problems in light of new regulations taking effect in July, regulators said in a draft assessment report released Thursday.

The assessment, if finalized by the Nuclear Regulation Authority, will enable reactors 3 and 4 at Kansai Electric Power Co.'s Oi plant in Fukui Prefecture to remain online through September, when they will be taken offline for mandatory routine checks.

"As of the end of June, we think . . . the situation will not create serious safety problems immediately," the NRA said in the report, which evaluated the current status of the reactors.