This seems like a sensible practical solution in respect of solving unpredictable Tsunami tidal surges around the coast of Japan and also produce a vast amount of electrical energy for the people of Japan!
Note; also the reactors and storage ponds of nuclear power station’s should have high strong buttress walls 30 metres high all the way around the power stations perimeters ! this will protect the prevailing winds carrying heavy nuclear particles away from the power station site! And reactors should have graphite and bi-carbonte soda added to the concrete, in order to arrest a melt down scenario! And also a casam directly under the reactor which contains 100s of tonnes of graphite and bi-carbonate soda, this would then arrest a n exposed melt down and moderate neutron emission and transfer heat by induction to ceramic inlaid pipes leading to beneath the sea!