Mitsubishi Heavy Industries designing nuclear propelled tanker and submarine tanker according to the Dutch newspaper Gereformeerd gezinsblad dated 28 August 1957

An item referred to a announcement in January that year that the Mitsubishi Heavy Industries started with designing 2 nuclear tankers, one a submarine tanker of 30,000 tons deadweight, the other a 47,000 tons deadweight tanker with 1-20,000 hp sodium graphite reactor.