“It’s unbelievable that anyone would want to restart nuclear plants when Japan hasn't learned how and why the Fukushima Daiichi accident happened, or learned lessons from it,”
That was a really dumb statement in that article. Maybe that's why he's the former chief research scientist at the Japan Atomic Energy Research Institute.
They know exactly how and why it happened, and the lessons learned from it! Loss of diesel generators means no power to drive the pumps that provide cooling. At my old job we had access to the core data and modeled it, you can see exactly what happened.
Edit: As a result of the lessons learned, the US nuclear have been putting in flex buildings that house portable diesel generators, pumps, hoses, etc. Here's one from Plant Vogtle in Georgia. http://www.powermag.com/vogtle-nucle...new-flex-dome/