Stable salt reactors are vastly safer than today’s reactors at the most fundamental level – the dangerous volatile radioactive products just do not exist in Stable Salt Reactors. No matter what happens to the reactor, there cannot be a vast radioactive plume like Chernobyl and Fukushima.
But Stable Salt Reactors have superior safety at many other levels:
Loss of coolant causes melt down in conventional reactors. Stable Salt Reactors, with their chemically stable and non-volatile coolant pool in an underground pit, cannot lose their coolant.
Catastrophic core damage, for example through terrorist attack, would merely release the fuel salt to mix safely with the large coolant salt pool so the radioactive products are diluted and still safely contained.
After shut down, nuclear fuel continues generating “decay heat”, which must be dissipated. Most reactors rely on water-based cooling systems that eventually run out of water, but Stable Salt Reactors can cool themselves forever just using natural air convection to pass the heat harmlessly into the atmosphere.
Stable Salt Reactors will shut themselves down automatically just through the laws of physics if they overheat. This is the ultimate safeguard if all the engineered safety systems should fail.