Because of no plutonium production from Th-MSR, unlike current solid Uranium fuel based reactors, it does not result in having the atomic bombs. Therefore, Th-MSR is very important for nuclear non-proliferation policy and path to make era of peace without nuclear weapon..

Compared with curren solid Uranium fuel based reactors, Th-MSR produces extremely little high-level nuclear waste. This advantage makes the risk of environmental pollution significantly lower.

As Th-MRS is liquid fuel based reactor without having solid nuclear fuel rods, there is, in principle and practically, no possibility of severe accidents as occurred in Three Mile Island and Chernobyl before, which caused great risk of core meltdown and/or large radioactivity release.

Furthermor, operation of Th-MRS is conducted under nomal pressure in normal pressured container, unlike under high-pressure in high pressured closed container for the current solid fuel reactors, and even if molten-salt might be released from the container, it would be solid like glass with no response to air. Earthquake-resistance is also accordingly ensured. This provides us with superior safety characteristics compared with any other nuclear reactor systems.

From the fact that thorium resorces exists over the world and its volume is more than 4 or 5 times of its Uranium, it is supposed that there is no risk factor of sesources, unlike the situation of Uranium.

In Th-MSR , there is no fuel-assembly fabrication and replacement acquired. In addition, with almost none of the high-level nuclear waste produced, its chemical processing cost is resultantly low. Reactor construction cost is effectively low thanks to its simple structure. Lower fuel cost than uranium due to thorium in liquid. It is therefore considered that the power generation cost of Th-MSR will be significantly lower than that of current LWR (Light Water Reactor) by 30% or more at least.

To cope with upcoming various requirement for small reactors to fit with their location nature, downsized comapct Th-MSR is possible bacause of its simple structure, unlike current LWR.
In case of LWR, ecomonical efficiency needs large scale reactors, more than one million kW. On the contrary, the economical efficiency of Th-MSR can be sufficiently affordable with small sized reactors. This will ensure the development of new industry by constructing Th-MSR at remote areas or developing countries.

When thorium is used for the fuel, a lot of fissile U(Uranium) 233 is produced, with accompaniment of strong gamma ray a lot. In case of solid nuclear fuel of Thorium, its reprocesing spent fuel will force to have much difficulties and high cost..
On the contrary, in case of Th-MSR, U(Uranium) 233 becomes volatile by injecting fluorine gas into the liquid fuel so that U233 can be separated to make reprocessing easy for its reuse.

As basic and related component technologies have already developed, almost none of the key subjects needs to be developed. The commercialization of Th-MSR will be accordingly realized in the short period and less cost.