Its too small for a low powered reactor. For a low energy density reactor, like HTGR or thermal gas reactors, you would need a much bigger sub, as the ratio of displacement vs. hydrodynamic drag favors large subs. Something of this size prefers a very high energy density reactor, and a liquid metal cooled reactor is the best bet if they want to quote something as revolutionary. Besides, this is something the Russians have good experience on, including a floating power plant. The Russians don’t have experience or any working example of a low energy density reactor like HTGR; that’s something the Chinese and the Japanese have direct experience on, as they are the only ones currently having working examples of.