It's all part of a ceremony (absolutely nothing more) to restart Ooi Nuclear Power Plant in Fukui Prefecture before the summer peak season starts. The power that be in Japan, whether they are politicians or industry big shots, do not want the situation where there is no nuclear power plant operating and there is no shortage of electricity.
So, the ceremony goes like this:
Governor of Fukui Kazumi (Issei) Nishikawa, who was a career bureaucrat in the national government, wants Prime Minister Noda to explain to the Japanese that nuclear power is indispensable to Japan, as the condition for agreeing to restart Ooi Nuclear Power Plant.
Prime Minister Noda gives a speech saying nuclear power is indispensable to Japan.
Governor Nishikawa listens to the speech, and is satisfied that the speech is good. He agrees to the restart, and makes necessary steps in his government for the restart.
Prime Minister, on receiving the news that Governor Nishikawa is now satisfied, convenes a ministerial meeting with Edano, Hosono, Fujimura (and Sengoku in the background), and make a political decision to restart the plant, upon his "responsibility" (whatever that means).
From Yomiuri Shinbun (6/8/2012):
Restart of Ooi Nuke Plant to be explained by Prime Minister in a press conference
Prime Minister Noda was making the final arrangement on June 7 for a press conference to explain to the citizens in Japan that nuclear power generation is necessary for Japan's energy policy. The press conference is part of the government effort to restart Reactors 3 and 4 at Ooi Nuclear Power Plant operated by Kansai Electric (KEPCO) (in Ooi-cho, Fukui Prefecture).
Governor Issei Nishikawa of Fukui Prefecture is demanding that the prime minister explain to the citizens of Japan about the need for nuclear power plants, as a condition to agreeing to restart the Ooi plant.
Governor Nishikawa has said that his prefectural government will proceed with steps to restart the plant if he is satisfied with the way Prime Minister Noda explains during the press conference. After obtaining the governor's consent, Prime Minister Noda is to convene a ministerial meeting right away to make the final decision on the restart of the plant.
Within the administration, there were many who were against such a press conference as "the prime minister has already explained the necessity [of nuclear power] in the previous press conferences". However, after conferring with people including Minister of Economy Edano at the Prime Minister's Official Residence on June 7, Noda decided that unless he responded to the Fukui governor's request, the timing for the restart would be delayed.
Governor Nishikawa seems to think that having PM Noda speak about nuclear power will convince the Japanese citizens of the need to restart one of many nuclear power plants in his prefecture, according to NHK news on 6/4/2012. Governor Nishikawa knows, however, that for him to say so is part of the ceremony, and one convenient way to evade whatever responsibility in case of an accident.
Meanwhile, 70 women including those from Fukushima Prefecture did a "die-in" on June 7 in front of the Prime Minister's Official Residence in protest against the restart of Ooi Nuclear Power Plant, according to Tokyo Shinbun (6/8/2012 morning edition)