That is, a vessel for a pressurized water reactor. A reactor operating at lower pressure (like one using molten salt as a coolant) wouldn't need such a vessel,

That is, a vessel for a pressurized water reactor. A reactor operating at lower pressure (like one using molten salt as a coolant) wouldn't need such a vessel, as the salt would not become highly pressurized, even in accident conditions. I saw a link from some government minister in Canada named Don Morgan who stated a BWRX-300 would cost $5B (CAN), which comes to about $3.6B (US). $12/W (US) is not the worst, but it isn't great. Not clear if that was all-in cost or just overnight cost. https://www.deassociation.ca/newsfeed/4-provinces-push-ahead-with-plan-to-build-small-nuclear-reactors-to-supply-power https://www.deassociation.ca/newsfeed/4-provinces-push-ahead...