"Just my opinion I could be wrong" D.M.
you are,...
both the the West Milton prototype and the Seawolf had enormous difficulties with S/G and superheater leaks, the sodium coolant was prohibitively radioactive for at least 14 hours following reactor shutdown (versus 8 minutes for light water reactors) denying the crew access to the reactor compartment in the event of any at-sea emergency. The Seawolf spent half a year stuck at the dock after the first reactor criticality testing to repair the aforementioned leaks prior to assuming underway missions, the prototype reactor was decommissioned before the Seawolf and retrofitted to D1G. To directly quote Rickover, “
There may be advantages for sodium for shore-based atomic power plants but I cannot see it for a ship. It is too dangerous for a ship.”
The Seawolf did operate underway on sodium reactor power for a bit over 70,000 nautical miles, during that entire time not one reactor compartment entry was made by the ship's force.
Too much risk for Rickover,....