Radiation levels on Wednesday, the day six workers were exposed to highly radioactive water, jumped 13 times the previous day's reading, the highest levels since late 2011.

A massive quake and tsunami hit the power station, operated by Tokyo Electric Power Co, also known as Tepco, in March 2011, causing three reactor meltdowns and hydrogen explosions.

Tepco, which is pouring hundreds of tonnes of water to keep reactors cool, has struggled to contain the build up of radioactive water at the plant.

In the latest incident, a worker on Wednesday mistakenly detached a pipe connected to a treatment system, releasing seven tonnes of highly radioactive water.

The accidents at the Fukushima Daiichi plant, 220 km (130 miles) north of Tokyo, are adding to the crisis and stirring doubt over Tepco's abilities to carry out a complex cleanup widely expected to take decades.

Tepco said combined Cesium-134 and Cesium-137 readings just outside the damaged No. 2 reactor spiked to 1,200 becquerels per liter on Wednesday, more than 13 times the level on Tuesday.

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