New images from inside Fukushima reactor spark safety worry

A spokesperson of the Tokyo Electric Power Company Holdings (TEPCO) shows photos captured by a robotic probe inside one of the three melted reactors at the tsunami-wrecked Fukushima nuclear power plant in Tokyo Tuesday. Pic/AP

Images captured by a robotic probe inside one of the three melted reactors at Japan's wrecked Fukushima nuclear power plant showed exposed steel bars in the main supporting structure and parts of its thick external concrete wall missing, triggering concerns about its earthquake resistance in case of another major disaster.

The plant's operator, Tokyo Electric Power Company Holdings, has been sending robotic probes inside the Unit 1 primary containment chamber since last year. The new findings released Tuesday were from the latest probe conducted at the end of March.

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An underwater remotely operated vehicle named ROV-A2 was sent inside the Unit 1 pedestal, a supporting structure right under the core. It came back with images seen for the first time since an earthquake and tsunami crippled the plant 12 years ago. The area inside the pedestal is where traces of the melted fuel can most likely be found. An approximately five-minute video - part of 39-hour-long images captured by the robot - showed that the 120-centimeter (3.9-foot) - thick concrete exterior of the pedestal was significantly damaged near its bottom, exposing the steel reinforcement inside.

TEPCO spokesperson Keisuke Matsuo told reporters Tuesday that the steel reinforcement is largely intact but the company plans to further analyze data and images over the next couple of months to find out if and how the reactor's earthquake resistance can be improved. The images of exposed steel reinforcement have triggered concerns about the reactor's safety.

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Tons of highly radioactive melted nuclear fuel in the reactors

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