France and the United States are to help Japan in its battle to contain radiation from a crippled nuclear complex where plutonium finds have raised public alarm over the world's worst atomic crisis since Chernobyl in 1986. The high-stakes operation at the Fukushima plant has added to Japan's unprecedented humanitarian disaster with 27,500 people dead or missing from a March 11 earthquake and tsunami.
French President Nicolas Sarkozy, who chairs the G20 and G8 blocs of nations, plans to visit Tokyo on Thursday. He will be the first foreign leader in Japan since the disaster. In further support, France flew in two experts from its state-owned nuclear reactor maker Areva and its CEA nuclear research body to assistr Japan's heavily-criticised plant operator Tokyo Electric Power Co (TEPCO).
A global leader in the industry, France produces about 75 percent of its power from reactors so it has a strong interest in helping Japan get through the Fukushima disaster. The United States is also weighing in to send some robots to Japan to help explore the reactor cores and spent fuel pools. With evidence mounting of radiation inside and beyond the plant, public fears rose a notch with Tuesday's announcement of plutonium traces in soil at five places within the facility.
A by-product of atomic reactions and a prime ingredient in nuclear bombs, plutonium is highly carcinogenic and one of the most dangerous substances on the planet, experts say.
Japan said, however, that only two of the plutonium traces had likely come from the plant, probably from overheating spent fuel rods or damage to reactor No 3, with the others being particles in the atmosphere from past nuclear testing abroad. The levels, of up to 0.54 becquerels per kg, were not considered harmful, Japanese officials said.
"It was the same level as normally found in the atmosphere as radioactive fallout after an atmospheric nuclear test, but a test done far away that would not directly affect someone," said Hidehiko Nishiyama, a senior official from Japan's nuclear safety agency.
The discovery did, however, mean that the reactor's containment mechanism had been breached, he said. "It underlines the gravity and seriousness of this accident."
First rattled by the earthquake and then engulfed by a giant wave, the Fukushima plant resembles a bomb site, with steam and smoke occasionally rising from mangled pipes and twisted steel.
Plant operator TEPCO is under enormous pressure, criticised for safety lapses and a slow disaster response. Its shares are down almost 75 percent since the quake - hitting a 47-year low on Tuesday - and there is talk of a state takeover. The government, too, is taking heat.
Already criticised for weak leadership during Japan's worst crisis since World War II, Prime Minister Naoto Kan was blasted by the opposition in parliament on Tuesday for his handling of the disaster and for not widening the exclusion zone beyond the current 20 km (12 miles) round Fukushima.
"Is there anything as irresponsible as this?" opposition legislator Yosuke Isozaki said. Kan said he was considering that step, which would force 130,000 people to move, in addition to 70,000 already displaced. There is rising despair among farmers and fishermen whose livelihoods have been turned upside down by the disaster. One 64-year-old farmer hanged himself last week after saying "our vegetables are no good anymore", local media said.
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