TOKYO — Japan's nuclear crisis appeared to be spinning out of control on Wednesday after workers withdrew briefly from a stricken power plant because of surging radiation levels and a helicopter failed to drop water on the most troubled reactor.
In a sign of desperation, the police will try to cool spent nuclear fuel at one of the facility's reactors with a water cannon, which is normally used to quell riots.
Early in the day, another fire broke out at the earthquake-crippled facility, which has sent low levels of radiation wafting into Tokyo in the past 24 hours, triggering fear in the capital and international alarm.
Japan's government said radiation levels outside the plant's gates were stable but, in a sign of being overwhelmed, appealed to private companies to help deliver supplies to tens of thousands of people evacuated from around the complex.
"People would not be in immediate danger if they went outside with these levels. I want people to understand this," Chief Cabinet Secretary Yukio Edano told a televised news conference, referring to people living outside a 18-mile exclusion zone. Some 140,000 people inside the zone have been told to stay indoors.
Video: Traces of radiation found on news crew (on this page)Workers were trying to clear debris to build a road so fire trucks could reach reactor No. 4 at the Dai-ichi complex in Fukushima, 150 miles north of Tokyo. Flames were no longer visible at the building housing the reactor.
High radiation levels prevented a helicopter from flying to the site to drop water into the No. 3 reactor — whose roof was damaged by an earlier explosion and where steam was seen rising earlier in the day — to try to cool its fuel rods.
The plant operator described No. 3 as the "priority." No more information was available, but that reactor is the only one at Dai-ichi which uses plutonium in its fuel mix.
Situation 'not so good' According to U.S. government research, plutonium is very toxic to humans and once absorbed in the bloodstream can linger for years in bone marrow or liver and can lead to cancer.
The situation at the No. 4 reactor, where the fire broke out, was "not so good," the plant operator added, while water was being poured into reactors No. 5 and 6, indicating the entire six-reactor facility was now at risk of overheating.
Nuclear experts said the solutions being proposed to quell radiation leaks at the complex were last-ditch efforts to stem what could well be remembered as one of the world's worst industrial disasters."This is a slow-moving nightmare," said Dr. Thomas Neff, a physicist and uranium-industry analyst at the Massachusetts Institute of Technology.
Japanese Emperor Akihito, delivering a rare video message to his people, said he was deeply worried by the country's nuclear crisis which was "unprecedented in scale."
"I hope from the bottom of my heart that the people will, hand in hand, treat each other with compassion and overcome these difficult times," the emperor said.
Panic over the economic impact of last Friday's massive earthquake and tsunami knocked $620 billion off Japan's stock market over the first two days of this week, but the Nikkei index rebounded on Wednesday to end up 5.68 percent.
Economic losses Nevertheless, estimates of losses to Japanese output from damage to buildings, production and consumer activity ranged from between 10 and 16 trillion yen ($125-$200 billion), up to one-and-a-half times the economic losses from the devastating 1995 Kobe earthquake.
Damage to Japan's manufacturing base and infrastructure is also threatening significant disruption to the global supply chain, particularly in the technology and auto sectors.
Scores of flights to Japan have been halted or rerouted and air travelers are avoiding Tokyo for fear of radiation. On Wednesday, both France and Australia urged their nationals in Japan to leave the country as authorities grappled with the world's most serious nuclear accident since the Chernobyl disaster in Ukraine in 1986.
In a demonstration of the qualms about nuclear power that the crisis has triggered around the globe, China announced that it was suspending approvals for planned plants and would launch a comprehensive safety check of facilities.
China has about two dozen reactors under construction and plans to increase nuclear electricity generation about seven-fold over the next 10 years.
In Japan, the plight of hundreds of thousands left homeless by the earthquake and devastating tsunami that followed worsened overnight following a cold snap that brought snow to some of the worst-affected areas.
While the death toll stands at around 4,000, more than 7,000 are listed as missing and the figure is expected to rise.
Concern at Fukushima At the Fukushima plant, authorities have spent days desperately trying to prevent water which is designed to cool the radioactive cores of the reactors from evaporating, which would lead to overheating and possibly a dangerous meltdown.
Until the heightened alarm about No. 3 reactor, concern had centered on damage to a part of the No. 4 reactor building where spent rods were being stored in pools of water, and also to part of the No. 2 reactor that helps to cool and trap the majority of cesium, iodine and strontium in its water.
Japanese officials said they were talking to the U.S. military about possible help at the plant.
