You're kinda sorta missing the point here. It could very well have become necessary to evacuate Tokyo. Upon learning this fact, the J-gov promptly buried it. THEY DID NOTHING.
Compare and contrast:
There was about a company-size element of CBIRF (IRF-A) sent to Tokyo to cover the evacuation of the US embassy, should it become necessary. It was withdrawn (to a US army base in Japan iirc), then sent again, then withdrawn again. They never set foot in Fukushima, because, regardless of what you read on the news, those guys are not aid workers; they are marines, there to shoot people and break things. Families of military and diplomatic personnel were evacuated, private US citizens told in no uncertain terms to evacuate a huge area around the NPP, pack up and stick close to airports... the US was preparing for the worst case scenario.
What did the J-gov do to prepare for significant fallout in Tokyo and the Kanto region? For a country cut in half by a radioactive wasteland?
Sure, worst did not come to worst and the SFPs did not boil dry. But this is not proof of good management.