Central government officials held a briefing in Saga prefecture, where two reactors at the Genkai power plant are among several across the country that were halted for regular checks when a huge quake and tsunami hit on March 11.
Local officials have since withheld routine consent for operations to resume, citing safety concerns after the tsunami triggered a crisis at the Fukushima Daiichi plant, which has leaked radiation into air, soil and sea.
Sunday's briefing was broadcast online, but only seven government-selected local residents were allowed to attend, while the meeting venue was not disclosed to the public.
In a press conference after the 90-minute briefing, one of the seven complained that it had been "way too short".
Another participant said: "Officials used many technical terms that were too difficult to understand. Since I didn't understand, I cannot agree with their explanation."