Fri Mar 18, 2011 4:20pm GM
By Shinichi Saoshiro and Yoko Nishikawa
TOKYO, March 19 (Reuters) - Exhausted Japanese engineers scrambled to fix a power cable to two reactors at a tsunami-crippled nuclear power station on Saturday as they fought to prevent a deadly radiation release in the world's worst nuclear accident since the Chernobyl disaster.
The dangerous and complex challenge for about 300 workers at the Fukushima plant in northeastern Japan, 240 km (150 miles) north of Tokyo, has unsettled the world's financial markets and prompted an international reassessment of nuclear safety.
At the plant, from where people within 20 km (12 miles) have been evacuated to avoid radiation, engineers were hoping to attach power lines to two of the six reactors in order to
restart water pumps and cool overheated nuclear fuel rods.
Workers also sprayed water on the No.3 reactor, considered the most critical after steam was seen blowing off, a sign the rods could be becoming exposed.
If those tactics fail, the option of last resort may be to bury the sprawling 40-year-old plant in sand and concrete to prevent a catastrophic radiation release, the method used to seal huge leakages from Chernobyl after a huge blast there.
Japan has raised the severity rating of the nuclear crisis from Level 4 to Level 5 on the seven-level INES international scale, putting it on a par with America's Three Mile Island
accident in 1979, although some experts say it is more serious.
Chernobyl was a 7 on that scale.
The operation to avert a large-scale radiation leak has overshadowed the humanitarian aspect of Japan's toughest moment since World War Two, after it was struck last Friday by a 9.0-magnitude earthquake and a 10-metre (33-foot) tsunami.
Around 6,500 have been confirmed killed in the double natural disaster, which turned whole towns into waterlogged wastelands, and 10,300 remain missing with many feared dead.
Some 390,000 people, including many among Japan's ageing population, are homeless and battling near-freezing temperatures in makeshift shelters in northeastern coastal areas.
Food, water, medicine and heating fuel are in short supply.
"Everything is gone, including money," said Tsukasa Sato, a 74-year-old barber with a heart condition, as he warmed his hands in front of a stove at a shelter for the homeless in Yamada, northern Japan.
Under enormous pressure over its handling of the combination of crises, Japan's government conceded it could have moved faster at the outset.
"An unprecedented huge earthquake and huge tsunami hit Japan. As a result, things that had not been anticipated in terms of the general disaster response took place," Chief Cabinet Secretary Yukio Edano told reporters late on Friday.
Health officials and the U.N. atomic watchdog have said radiation levels in the capital Tokyo were not harmful, but the city has seen an exodus of tourists, expatriates and many
Japanese, who fear a blast of radioactive material.
"I'm leaving because my parents are terrified. I personally think this will turn out to be the biggest paper tiger the world has ever seen," said Luke Ridley, 23, from London as he sat at
Narita international airport using his laptop.
"I'll probably come back in about a month."
Amid their distress, Japanese were proud of the 300 or so nuclear plant workers toiling in the wreckage, wearing masks, goggles and protective suits sealed by duct tape.
"My eyes well with tears at the thought of the work they are doing," Kazuya Aoki, a safety official at Japan's Nuclear and Industrial Safety Agency, told Reuters.
Even if engineers restore power at the plant, the pumps may be too damaged to work.
The first step will be to restore power to pumps for reactors No. 1 and 2, and possibly 4, by Saturday, said Hidehiko Nishiyama, Japan's nuclear safety agency spokesman.
By Sunday, the government expects to connect electricity to pumps for its badly damaged reactor No.3 -- a focal point in the crisis because of its use of mixed oxides, or mox, containing
both uranium and highly toxic plutonium.
That could be a turning point.
"If they can get those electric pumps on and they can start pushing that water successfully up the core, quite slowly so you don't cause any brittle failure, they should be able to get it
under control in the next couple of days," said Laurence Williams, of Britain's University of Central Lancashire.
The last-resort option of burying the reactors could leave part of Japan off-limits for decades.
FINANCIAL INTERVENTION
The Group of Seven rich nations, attempting to calm global financial markets after a tumultuous week, agreed on Friday to join in a rare concerted intervention to restrain a soaring yen.
The U.S. dollar surged more than two yen to 81.80 after the G7's pledge to intervene, leaving behind a record low of 76.25 hit on Thursday.
Japan's Nikkei share index ended up 2.7 percent, recouping some of the week's stinging losses. It has lost 10.2 percent this week, wiping $350 billion off market capitalisation.
Expectations that Japanese insurers and companies would repatriate billions of dollars in overseas funds to pay for a reconstruction bill that is expected to be much costlier than the one that followed the Kobe earthquake in 1995 also have helped boost the yen.
The plight of those left homeless by the earthquake and tsunami worsened following a cold snap that brought heavy snow to worst-affected areas.
Nearly 320,000 households in the north were still without electricity, officials said, and the government said at least 1.6 million households lacked running water.
Aid groups say most victims are receiving attention, but there are pockets of acute suffering.
"We've seen children suffering with the cold, and lacking really basic items like food and clean water," said Stephen McDonald of Save the Children, in a statement on Friday.
(Additional reporting by Linda Sieg, Nathan Layne, Elaine Lies, Leika Kihara, Joseph Radford and Chris Gallagher in Japan; Fiona Ortiz in Madrid; Writing by Jason Szep and Andrew Cawthorne; Editing by Daniel Magnowski, sourced :Reuters)
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