Tokyo (cnn) - the Japanese authorities say high of radiation readings of one of the basins of spent fuel at the Fukushima Daiichi nuclear power can be caused by radioactive debris from outside rather than damage to the fuel inside bars.
A pool of older houses collected water sample bars of fuel from the reactor No. 4 showed a higher amount than normal of iodine-131 radioactive, said Hidehiko Nishiyama, chief spokesman for the nuclear and industrial safety agency. It is an indication that the fuel rods may have suffered damage since the disaster, but the cause was still under investigation, he said.
High levels of radiation first reported Wednesday that were "high", Nishiyama said. This suggesting the source might have radioactive debris blow in the basins of the outside of the heavily damaged building.
"If the fuel rod had a few problems, the value would much higher," said Nishiyama.
The safety commission reported more often measured radioactivity of iodine-131, the by-product of reactor, 84 millisieverts per hour Wednesday - a level which would give the workers at the plant of their maximum annual dose in about three hours.
Engineers are struggling to stabilize the factory of Fukushima Daiichi paralyzed since March 11, when the tsunami following the earthquake of magnitude 9 of the Japan was knocked unconscious its cooling systems. The cores of three of the six reactors were damaged by overheating and resulting from the explosion of hydrogen in the early days of the disaster, now classified as a high-scale nuclear accident.
Workers of the plant have been side of hundreds of tons of water per day in three reactors which were damaged in the suite, and at least one of the reactors, in unit 2, believed leaking highly radioactive water. Radioactive contamination spread over a large swath of land around the plant and in the adjacent Pacific Ocean, although published by ministries of the Government data showed a decline in radiation levels in recent weeks.
Engineers took steps this week towards containing the disaster, pumping of radioactive water from tunnels and trenches of service in a storage tank for the No. 2 reactor steam condensers. And they throw the plumbing necessary to transfer approximately 10 000 tons in a facility designed for the treatment of low level radioactive waste, owner of the factory, Tokyo Electric Power Company, said Thursday.
The company spilled more than 9 000 tonnes of radioactive water at least in the Pacific last week to make room for the more dangerous fluid believed to be leaking from the reactor No. 2 - a Japanese authorities move described as an emergency measure, but one that angry fishermen in the country.
The Government issued evacuation orders extended Monday in several cities outside the radius of 30 kilometres, which has been declared a danger zone, in the early days of the disaster warning that prolonged exposure to levels of radiationIt may constitute a danger to human health long term. And data from the Japanese Government this week reported finding low levels of radioactive strontium, another by-product of reactor, two of these cities in the days after the disaster.
Strontium-90 is considered a danger to the health not only due to its radioactive half-life of 29 years, but because part of it gets absorbed by bones if ingested, according to the U.S. Environmental Protection Agency. There is no acceptable standard for strontium under Japanese regulations, but the science of the Japan Ministry said that the reported figures were not high enough to pose an immediate danger to human health.
The Japanese Government attempted to limit the damage caused to farmers in Fukushima and other prefectures where the contamination of the plant has been found, lifted bans on products of the farm surrounding areas if they pass three tests in three successive weeks.
Secretary General of Government Yukio Edano, man of the Government on the crisis point, announced Thursday that kakina, deciduous green, of Tochigi Prefecture was now safe for shipping. The move follows a plant of prohibition on shiitake mushrooms grown outdoors in cities and the neighbouring villages 16 damaged to the list of prohibited food of the country Wednesday.Asuka Murao, Gen Shimada and Susan Olson contributed to this report by CNN.
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