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No, they mean everything in a spaceship. If you have to use a solid core NTR, you'll have literally half (or more) of your spaceship being made up of propellant tanks. If you use a gas-core (likely a nuclear lightbulb since you can use it in orbit), then you have fewer problems for getting...

It heavily depends on the most important aspect of the ship: the engines. Are they Solid-Core NTRs (aka the shittiest nuclear engines that need methane or decane to really work) or Nuclear Lightbulbs (basically a gas nuclear engine with quartz bulbs as the interaction point between the fission...