TOKYO — A possible breach at Japan's troubled nuclear plant escalated the crisis anew Friday, two full weeks after an earthquake and tsunami first compromised the facility. The development suggested radioactive contamination may be worse than first thought, with tainted groundwater the most likely consequence.
Japanese leaders defended their decision not to evacuate people from a wider area around the plant, insisting they are safe if they stay indoors. But officials also said residents may want to voluntarily move to areas with better facilities, since supplies in the tsunami-devastated region are running short.
The escalation in the nuclear plant crisis came as the death toll from the quake and tsunami passed 10,000 on Friday. Across the battered northeast coast, hundreds of thousands of people whose homes were destroyed still have no power, no hot meals and, in many cases, no showers for 14 days.
The uncertain nuclear situation again halted work at the Fukushima Dai-ichi complex, where authorities have been scrambling to stop the overheated facility from leaking dangerous radiation. Low levels of radiation have been seeping out since the March 11 quake and tsunami knocked out the plant's cooling system, but a breach could mean a much larger release of contaminants. The most likely consequence would be contamination of the groundwater.
"The situation today at the Fukushima Dai-ichi power plant is still very grave and serious. We must remain vigilant," a somber Prime Minister Naoto Kan said. "We are not in a position where we can be optimistic. We must treat every development with the utmost care."
The possible breach in the plant's Unit 3 might be a crack or a hole in the stainless steel chamber of the reactor core or in the spent fuel pool that's lined with several feet of reinforced concrete. The temperature and pressure inside the core, which holds the fuel rods, remained stable and was far lower than what would further melt the core.
Suspicions of a possible breach were raised when two workers suffered skin burns after wading into water 10,000 times more radioactive than levels normally found in water in or around a reactor, the Nuclear and Industrial Safety Agency said.
Water with equally high radiation levels was found in the Unit 1 reactor building, Tokyo Electric Power Co. officials said. Water was also discovered in Units 2 and 4, and the company said it suspects that, too, is radioactive. Officials acknowledged the water would delay work inside the plant.
Plant officials and government regulators say they don't know the source of the radioactive water discovered at Units 1 and 3. It could have come from a leaking reactor core, associated pipes, or a spent fuel pool. Or it may be the result of overfilling the pools with emergency cooling water.
Friday marked two weeks to the day since the magnitude-9.0 quake triggered a tsunami that flattened cities along the northeastern coast. With the cleanup and recovery operations continuing and more than 17,400 listed as missing, the final number of dead was expected to surpass 18,000.
Kan apologized to farmers and business owners for the toll the radiation has had on their livelihoods: Several countries have halted some food imports from areas near the plant after elevated levels of radiation were found in raw milk, sea water and 11 kinds of vegetables, including broccoli, cauliflower and turnips.
He also thanked utility workers, firefighters and military personnel for "risking their lives" to cool the overheated facility.
The nuclear crisis has compounded the challenges faced by a nation already saddled with a humanitarian disaster. Much of the frigid northeast remains a scene of despair and devastation, with Japan struggling to feed and house hundreds of thousands of homeless survivors, clear away debris and bury the dead.
"It's still like I'm in a dream," said Tomohiko Abe, a 45-year-old machinist who was in the devastated coastal town of Onagawa trying to salvage any belongings he could from his ruined car. "People say it's like a movie, but it's been worse than any movie I've ever seen."
A breach at the nuclear plant could mean a leak has been seeping for days, likely since the hydrogen explosion at Unit 3 on March 14. It's not clear if any of the contaminated water has run into the ground. Radiation readings for the air were not yet available for Friday, but detections in recent days have shown no significant spike.
Elevated levels of radiation have turned up elsewhere, including the tap water in several areas of Japan. In Tokyo, tap water showed levels thrice as high as the government standard for infants, who are particularly vulnerable to cancer-causing radioactive iodine, officials said.
The scare caused a run on bottled water in the capital, and Tokyo city officials are distributing it to families with babies.
Previous radioactive emissions have come from intentional efforts to vent small amounts of steam through valves to prevent the core from bursting. However, releases from a breach could allow uncontrolled quantities of radioactive contaminants to escape into the ground or air.
Government spokesman Yukio Edano said "safety measures may not be adequate" and warned that may contribute to rising anxiety among people about how the disaster is being managed.