Japan will begin releasing a second batch of wastewater from the crippled Fukushima nuclear plant from next week, its operator has said, an exercise that angered China and others when it began in August.

On Aug. 24, Japan began discharging into the Pacific some of the 1.34 million tons of wastewater that has collected since a tsunami crippled the facility in 2011.

"The inspections following the first release have been completed ... The (second) discharge will start on Oct. 5," Tokyo Electric Power Company Holdings said on Thursday.