IHI is already using one Kurion machine, called the Fukushima Inspection Manipulator, to help pinpoint leaks in the pressure containment vessel surrounding Unit 2's reactor.
The manipulator can reach nearly 10 meters; the ROVs were towered into the pressure containment vessel by cables.
If early modules are to be in operation while later ones are being constructed, a common secondary containment
would be ruled out, making fuel handling and maintenance more expensive.
The problems we identified in 1975 were that, in doing the design of the containment, they did not take into account the dynamic loads that could be experienced with a loss of coolant," Bridenbaugh told ABC News in an interview.
He added: "The impact loads the containment would receive by this very rapid release of energy could tear the containment apart and create an uncontrolled release.