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Tepco, the utility company tasked with overseeing cleanup and waste processing for the former Fukushima Daiichi nuclear plant, hit another snag this week. Concluding month, we reported on new findings about Reactor #2 that showed it was far more radioactive inside than previously measured. At the time, nosotros noted that Tepco was working on a new robot that could handle upwards to 73 sieverts of radiation, but the measured level of 530 sieverts vastly exceeded that tolerance.

Now, Tepco has admitted that repeated robot failure is hampering its plan to search the bottom of the reactor, and detect the estimated 600 tons of fuel and debris that may take poured out of the reactor and into the concrete lining beneath it. Initial attempts to come across into Reactor #2 via robotic probe have all failed. We've just been able to estimate contamination levels past checking the amount of interference in the video feed the robot relays. The new hardened robot congenital past Toshiba and meant to give Tepco a much-improved power to survey the harm reactor died 5x faster than expected and stalled x feet from the grate it needed to inspect.

A blended photo of the metal grate and the pigsty in it, directly beneath the Reactor Pressure Vessel.

In the wake of this setback, Naohiro Masuda, president of the Fukushima Daiichi Decommissioning, has called for imaginative thinking. "Nosotros should think out of the box so we can examine the bottom of the core and how melted fuel droppings spread out," Masuda told reporters.

Robots have been dying in Fukushima reactors since the disaster, merely this is a higher-contour failure. The new robot Toshiba built (it's been described as scorpion-like) was meant to solve this problem. The fact that it failed so chop-chop merely underscores how much problem Tepco is likely to accept in further improving its blueprint.

Why is radiation then bad for robots?

Radiation has different effects on robots than it does on people. The verbal effects differ depending on what blazon of radiations it is (alpha, beta, gamma) and the composition of the inorganic substance. But radiation has a well-known tendency to interfere with or destroy electronics. Gamma rays will plough wiring brittle, which is a existent issue when attempting to build a mobile robot. It can too damage electronic circuits (again, this depends on the type of radiations and the materials used to construct the necessary components). Presumably Tepco and Toshiba already chose to build their robot with radiation-hardened chips and shielded the vital parts of the robot as best they could. Wikipedia has an extensive commodity on radiation hardening and how it's washed, for those who would like more information on the topic.

At that place's no practical way to shield humans from the amount of radiation coming off Fukushima Daiichi'south Reactor #ii, and existing robot designs aren't working well, despite relying on a minimum number of electronic parts. Building chips and robots that are radiations-hardened enough to perform their intended duties without being weighed downwards past heavy shielding could be extremely difficult and expensive to develop.

Tepco continues to insist it can encounter a 2021 goal of get-go actual site clean-upwardly. This will require enormous investments in the field of robotics and may require the company to create entirely new designs to ensure their hardware doesn't die in a matter of minutes. If the company'southward survey robots keep dying, how are they going to field robots that can cutting and gather the nuclear fuel that melted into physical?

Now read: How does nuclear energy work?