...Tuesday’s examination with an industrial endoscope detected radiation levels up to 10 times the fatal dose inside the chamber. Plant officials previously said more than half of melted fuel has breached the core and dropped to the floor of the primary containment vessel, some of it splashing against the wall or the floor.
Particles from melted fuel have probably sent radiation levels up to dangerously high 70 sieverts per hour inside the container, said Junichi Matsumoto, spokesman for Tokyo Electric Power Co.
“It’s extremely high,” he said, adding that an endoscope would last only 14 hours in that condition. “We have to develop equipment that can tolerate high radiation” when locating and removing melted fuel during the decommissioning.
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