Still recovering from the Fukushima Daiichi nuclear disaster, the Japanese government has been working with the Hybrid Assistive Limb exoskeleton. Developed by the University of Tsukuba's Cyberdyne, HAL has sensors that monitor signals coming from the user's brain. This takes the weight off the wearer's muscles and a computer monitors heart rate and breathing. The device is already being used for medical rehabilitation.
Because it has the additional feature of blocking radiation on the outside while the inside circulates air, HAL should be suited for work in the disabled power plant. Unfortunately, it may take decades to decommission it. The video shows the suit being demonstrated last year.