The government is now calling for the voluntary evacuation of the 20-30km zone around Fukushima Daiichi. Until now, that zone has been under a shelter-in-place order. The reason given for this change is not radiation, but because supplies in the zone are dwindling and they are having trouble re-supplying the area. Apparently truck drivers are refusing to enter the area due to radiation concerns. Lack of fuel in the zone is also an issue.

Edit: This morning, been reading about conflicting statements by the government and TEPCO regarding the possible loss of containment in the reactor vessel for reactor 3. Reactor 1 is also apparently far from being stabilized. So, depending on whom you believe, the situation is arguably getting worse again and perhaps this is the reason for the new voluntary evacuation order for the 20-30km zone.