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There are parts to using liquid graphite
liquid sodium that make the core inherently more unstable
Pwr plants are generally more well self sustaining
event of an emergency h2 buildup should not be an issue
pressure can most certainly be relieved if it gets too high
They just took poor care of their plant and that was the main cause of their catastrophe.
2. In what situation is water required?
4. The idea is that continuous reprocessing removes waste products from the fuel, rather than let it accumulate. In addition, the fissile inventory is fairly low.
5. The final form of the waste is probably not going to be a liquid.
6. The melting point of the fuel is over 450 C.
7. A melt-down in a conventional reactor is dangerous for completely different reasons than for this. In a PWR, if the core looses cooling for an extended period of time, hydrogen is produced when fuel cladding reacts with water in an exothermic reaction. This makes the core hotter and creates hydrogen gas. Hydrogen gas can explode and destroy the containment (newer plants are designed to mitigate this). If cooling is re-established with containment breached, the cooling water will leak everywhere and spread contaminants to the environment. And (regardless of a hydrogen explosion) if cooling still isn't provided then pressure can build till containment fails, at which point the reduced pressure allows the water to boil (and escape into the environment taking the fission products with it) then the core will melt onto or through the floor.
In a Molten Salt Reactor none of those can happen. The boiling point of the fuel/coolant is extremely high, it's not likely going to become a gas. As far as I know no there are no explosive materials. In an emergency, all that is needed is to drain the core onto a plate with reasonably large surface area and leave it there.