A group of politicians headed by the very person (Yasuhiro Nakasone) who was instrumental in introducing the nuclear energy in the post-World-War-II Japan has declared that the slow recovery from the March 11, 2011 disaster is because of the Japan's Constitution.
The Japanese Constitution was drafted by the officers at GHQ under General Douglas MacArthur and translated into Japanese and enacted in 1947. Hawks like Nakasone have been itching to scrap the Constitution that has "the Article 9" (renunciation of war).
From Jiji Tsushin (5/1/2012):
Slow recovery stems from the Constitution, says a nonpartisan group of politicians
The Alliance for Enacting the New Constitution, a nonpartisan group of politicians headed by former Prime Minister Yasuhiro Nakasone met in the Parliamentary Museum on May 1 to promote the enactment of the new constitution. The group sees the current Constitution as a hotbed of the vertically segmented administrative system. It passed the resolution declaring "The fundamental cause of delay in the recovery from the March 11, 2011 disaster is the current Constitution" and that the group would promote the national debate toward constitutional amendment.
The group like this, or the one headed by the boy-wonder mayor of Osaka City, do not want to amend the Constitution. They want to ditch it completely.