Kyushu Electric Power plans to start loading fuel into the No. 1 reactor at its Sendai nuclear plant in Kagoshima Prefecture on Tuesday.
The utility informed the Nuclear Regulation Authority of its schedule on Friday.
Kyushu Electric said 157 nuclear fuel rods will be inserted into the reactor by crane over a four-day period.
Barring any problems, the Sendai nuclear plant is scheduled to be brought back online in mid-August. A restart of the 890-megawatt No. 1 reactor following stringent safety checks would mark the first resumption of nuclear power generation in nearly two years.
Prime Minister Shinzo Abe has said rebooting the country's nuclear sector is needed to cut the cost of using fossil fuels for power generation, but he faces a deeply skeptical public after the meltdowns at the Fukushima Daiichi plant.
Kyushu Electric initially planned to restart the No. 1 reactor in July but operational checks took two weeks longer than previously announced.
The company made no changes to the planned restart of the 890-megawatt Sendai No. 2 reactor in late September.
All 43 of Japan's operable nuclear reactors are currently offline. However, five of them have received basic clearance and are at varying stages of the review process.© Japan Today/Thomson Reuters