Some government assurances of safety have done little to quell panic. In Tokyo, for instance, there were runs on bottled water after officials said radiation in tap water there was above the level considered safe for infants, though insisted it was still OK for adults.
On Tuesday, officials decided to apply the maximum allowable radiation limit for vegetables to fish, according to Edano.
"We will conduct strict monitoring and move forward after we understand the complete situation," he said.
The move came after the health ministry reported that fish caught off Ibaraki prefecture — which is about halfway between the plant and Tokyo — contained levels of radioactive iodine that would have exceeded the new provisional limit. Cesium also was found, at just below the limit. The fish were caught Friday, before the new provisional safety limits were announced.
Such limits are usually very conservative. After spinach and milk tested at levels far exceeding the safety standard, health experts said you would have to eat enormous quantities of tainted produce or dairy before getting even the amount of radiation contained in a CT scan.
Radioactivity is pouring into the ocean, in part, because workers at the plant have been forced to use a makeshift method of bringing down temperatures and pressure by pumping water into the reactors and allowing it to gush out wherever it can. It is a messy process, but it is preventing a full meltdown of the fuel rods that would release even more radioactivity into the environment.
The government on Monday gave the go-ahead to pump more than 3 million gallons of less-contaminated water into the sea — in addition to what is leaking — to make room at a plant storage facility to contain more highly radioactive water.
TEPCO's reputation has taken a serious hit in the crisis. On Tuesday, its stock dropped 80 yen — the maximum daily limit, or 18 percent — to just 362 yen ($4.3), falling below its previous all-time closing low of 393 yen from December 1951.