I'm interested in how this robot "survived" the radiation levels that many previous robots did not [1]. I know little to nothing about radiation hardening, but this seems like an almost impossible task, considering it being exposed to more than 530 sieverts per hour [2], which is the highest radiation level ever recorded.

[1] http://gizmodo.com/excessive-radiation-inside-fukushima-frie...

[2] https://www.sciencealert.com/radiation-levels-in-the-fukushi...