Workers at TEPCO's Fukushima Daiichi nuclear power plant have started moving low level contaminated water to a giant steel barge for storage.

The transfer from the plant's make-shift tanks started on Thursday afternoon to the barge called the "mega float." The barge is attached to a quay on the plant's premises.

The make-shift tanks have been almost full since Wednesday with low-level radioactive water pumped from the basement of the reactor Number 6 turbine building. The water is threatening to damage equipment and gauges and thus hamper cooling efforts.