A former nuclear power plant designer with 36-year-experience Yuzo Uehara sent his proposal with the diagrams to this blog. Thank you, Mr. Uehara.
The Culvert Prefabrication Method System to cool down Fukushima Daiichi nuclear reactors while minimizing radiation exposure
(Some texts have not been translated since most of them have been already covered by his tweets. So, please refer to the translated texts on this blog.)
(click the images to enlarge)