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http://www3.nhk.or.jp/daily/english/13_10.html


Nuclear reactors in serious status

Work on cooling nuclear reactors is facing difficulties at 2 power plants in quake-hit Fukushima Prefecture, northeastern Japan.

At the Fukushima Number One Power Plant, both the number one reactor, and the number two reactor's emergency generators broke down, making it difficult to pump water into the reactors. That allowed temperatures in the reactors to rise.

Pressure inside the containment vessel of the reactors also remains higher than normal.

The Tokyo Electric Power Company, the plants' operator, tried to restore depressurizing equipment using a mobile generator. But the plan failed as the equipment had already been damaged by tsunami waves.

At the Number Two Plant, cooling water temperatures in its 3 reactors remain at 100 degrees Celsius--more than 3-times higher than the normal operating temperature.

The utility is considering other options to restore failed cooling systems for these reactors.

On Saturday, the government's Nuclear and Industrial Safety Agency said 2 radioactive substances, cesium and iodine, had been detected near the Number One reactor at the Number One power plant. This indicates nuclear fission of uranium fuel. The agency announced some fuel in the reactor had partially melted. Sea water is being used to try to cool that reactor.

The electric company is not sure how soon it will be able to completely halt the reactors at the 2 power stations.

Sunday, March 13, 2011 09:37 +0900 (JST)

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http://www3.nhk.or.jp/daily/english/13_12.html


US reactor experts en route to Japan

The US Nuclear Regulatory Commission has dispatched 2 specialists to Japan to discuss how to deal with the accidents at 2 quake-damaged nuclear power plants in Fukushima.

The 2 experts are scheduled to arrive on Sunday as part of a rescue team from the US Agency for International Development.

The Nuclear Regulatory Commission oversees operations and management of nuclear power plants in the United States.

Chairman Gregory Jaczko says the organization has some of the world's top nuclear experts and is ready to assist in any way possible.

Sunday, March 13, 2011 09:37 +0900 (JST)

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http://www3.nhk.or.jp/daily/english/13_06.html


Nuclear accident rated at level 4

The Japanese government rates the accident at the Fukushima Number One nuclear power plant at level 4 on an international scale of 0 to 7.

Two radioactive substances, cesium and radioactive iodine, were detected near the Number One reactor at the plant on Saturday. Their presence indicates nuclear fission of uranium.

The Nuclear and Industrial Safety Agency said that fuel in the reactor partially melted. It's the first such accident in Japan.

A level 4 on the International Nuclear and Radiologocal Event Scale includes damage to fuel and release of significant quantities of radioactive material within an installation.
It's the same level as a criticality accident at a nuclear fuel processing plant in Tokai Village in Ibaraki Prefecture, south of Fukushima, in 1999.

The agency called the accident very regrettable even though it was triggered by an earthquake.

Sunday, March 13, 2011 07:08 +0900 (JST)

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