Workers to enter Japan reactor for 1st time since blast

Fukushima staff equipped with protective suits, air tanks; it may take a year to bring plant back under control after earthquake, nuclear crisis.

Fukushima power plant Japan 311 (photo credit: REUTERS/Air Photo Service)
Fukushima power plant Japan 311
(photo credit: REUTERS/Air Photo Service)
TOKYO - Workers were set to enter the No.1 reactor building at Japan's crippled Fukushima Daiichi nuclear plant on Thursday for the first time since an explosion ripped its roof off a day after the devastating March earthquake and tsunami.
Tokyo Electric Power (TEPCO) said 12 staff equipped with protective suits, masks and air tanks would go through a special tent set up at the entrance to prevent radiation leaks.
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Under Japanese law, nuclear plant workers cannot be exposed to more than 100 millisieverts over five years, but to cope with the Fukushima crisis, the health ministry raised the legal limit on March 15 to 250 millisieverts in an emergency situation.
Radiation of up to 49 millisieverts per hour was detected inside the building on April 17 when the company sent in a robot.
The magnitude 9.0 quake and massive tsunami that followed on March 11 killed about 14,800 people, left some 11,000 missing and destroyed tens of thousands of homes.
It also knocked out all the cooling systems at the Fukushima plant, 240 km (150 miles) north of Tokyo, leading to the greatest leak of radiation since the 1986 Chernobyl disaster.
People living within a 20 km radius of the plant were evacuated and banned from returning home on April 21 due to concerns about radiation levels.
US Nuclear Regulatory Commission chairman Gregory Jaczko told lawmakers in Washington on Wednesday that Japanese authorities were struggling to control the damaged Fukushima nuclear plant.
"While we have not seen or predicted any new significant challenges to safety at the site, we have only seen incremental improvements towards stabilising the reactors and spent fuel pools," Jaczko said.