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Radioactive Water From Fukushima Will Be Stored In New Underground 'Temporary' Tanks


Japan Broadcasting Corporation: April 24, 2011

TEPCO to install more wastewater storage tanks

The Tokyo Electric Power Company has decided to construct temporary storage tanks for highly radioactive wastewater accumulated at the damaged Fukushima Daiichi nuclear power plant.

The decision is part of the company's efforts to remove nearly 70,000 tons of wastewater pooled in turbine buildings and service tunnels in the compound of the plant. The contaminated water has been hampering work to restore reactor cooling systems.

TEPCO plans to transfer the wastewater to an on-site waste processing facility and temporary storage tanks based on a schedule for getting the nuclear emergency under control.

The company also plans to install water filtration and cooling systems for each reactor. Each system is designed to remove radioactive substances from the wastewater and recycle cold water into the pressure vessel to gradually cool down the nuclear fuel in the reactors.

TEPCO initially planned to install tanks with a capacity of 27,000 tons by the end of May. However, the company is now planning to construct 31,400 tons of storage capacity by early June.

In addition, the company plans to add tanks with a total capacity of 20,000 tons every month from June to December in case the water filtration and cooling systems cannot start operating on schedule in June.

TEPCO says the radioactive water will be sorted into 3 levels of contamination --- low, medium and high --- and will be stored accordingly.
TEPCO regards the high level wastewater as containing radioactive substances ranging from 100 to one million Becquerels per cubic centimeter.

To store the highly radioactive water safely, the company plans to construct special underground tanks coated with material resistant to radiation and corrosion, which have a total capacity of 10,000 tons.

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TEPCO Found 'Highly Radioactive' Concrete Fragment 900 mSv/h.


Japan Broadcasting Corporation: April 24, 2011

The operator of the damaged Fukushima Daiichi nuclear power plant says that concrete debris emitting a high level of radiation has been found near the Number 3 reactor.

Tokyo Electric Power Company, or TEPCO, says its workers detected radioactivity of 900 millisieverts per hour being emitted from a 30-by-30 centimeter concrete fragment, 5 centimeters thick, on Wednesday.

The workers were using heavy equipment to remove rubble near the electrical switchyard.

TEPCO says the workers were exposed to 3.17 millisieverts of radiation during the clean-up and the concrete block has been stored safely in a container with other debris.

The utility believes the contaminated fragment could be part of debris scattered across the compound as a result of a hydrogen explosion at the Number 3 reactor.