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TOKYO (AFP) – Workers entered a setup antiquity at Japan's stricken thermonuclear being weekday for the prototypal instance since an discharge hit the artefact a period after the March 11 seism and tsunami, officials said.

Wearing gas masks and conserving suits with gas tanks on their backs, two workers stepped into the antiquity structure setup sort one -- one of four reactors badly dilapidated at the Fukushima Daiichi being -- to gauge irradiation levels.

"It was the prototypal entry into the setup antiquity by our being workers since the explosion," said Satoshi Watanabe, a spokesman for operator Yeddo Electric Power Co (TEPCO).

The consort plans to beam at least 12 workers inside during the period to ordered up an expose word grouping that aims to cut levels of radioactivity in the expose within the setup building, the officials said.

"We are sending workers as a small group for a peak of 10 transactions so that irradiation they will be unclothed to crapper be limited," Watanabe added.

"We hope to control the ventilator after in the day."

TEPCO will then begin antiquity a newborn chilling grouping right the setup -- with liquid pipes conjunctive it to heat exchange equipment inside -- in a bid to set temperatures in the setup since it began overheating mass the twin natural disasters.

TEPCO plans to complete cerebration on the newborn chilling grouping in late May or primeval June, topical media said. Engineers aim to attain steady "cold shutdowns" toward the end of the year.

The setup had been likewise chanceful for humans to enter.

The Fukushima plant, north of Tokyo, was enclosed by the monster wave that followed the nation's biggest earthquake, and rocked by a program of explosions and fires.

It has been releasing hot materials into the surround in the world's worst thermonuclear hardship since Chernobyl in 1986.

On Wednesday, TEPCO said levels of hot substances hit jumped in the Pacific bottom soured Japan nearby the plant.

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