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March 23rd, 2011
09:15 AM ET

The status of six reactors at the Fukushima Daiichi nuclear plant

CNN Wire Staff

Tokyo (CNN) - Workers at Japan's Fukushima Daiichi nuclear power plant have been scrambling to cool down fuel rods and prevent the release of additional radioactive material since a 9.0-magnitude earthquake and tsunami hit the area on March 11.

Here is a summary of the status of each of the plant's six reactors and surrounding buildings, according to the non-profit Japan Atomic Industrial Forum, Tokyo Electric Power Co. (TEPCO) and the International Atomic Energy Agency.

Reactor No. 1

Japan's Nuclear and Industrial Safety Agency said Wednesday that temperatures had spiked above 400 degrees Celsius in this reactor, forcing workers to inject more seawater into the reactor to cool it down.

On Tuesday TEPCO reported that seawater did more damage electrical and cooling systems for this reactor than previously believed, and the unit will take longer to repair than expected.

Fuel rods have been partly exposed, and the core of the reactor is believed to have been damaged. The building that houses the reactor was severely damaged in a hydrogen explosion March 12, but the containment vessel - the steel and concrete shell that insulates radioactive material inside - was not damaged.

Workers have been pumping a mix of seawater and boron into the reactor to prevent further core damage until coolant systems can be brought back online.

Reactor No. 2

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