Molten Salt – low pressure,
The second part of the name refers to the type of “coolant” that is used in the reactor. Molten salt has several benefits. Firstly, since it is already in a molten state, a meltdown situation is effectively impossible. Secondly, the salt can handle very high temperatures without needing to increase the pressure. This has safety and efficiency benefits. Thirdly, there is no water used in the reactor – this means past accidents resulting in the release of radioactive material are no longer possible.