For an author of typically insightful comments, you would do us all well to educate yourself rather than citing nonsense and propagating FUD. Molten salt reactors are a silver bullet capable of end our dependance on fossil fuels. Working to tarnish the singular available option with that potential is not helpful.
Molten salt reactors are by definition meltdown proof, as the working state is already molten. The fuel salts are impervious to radiation damage, and the vessel will melt long before the salts boil, at which point the salts will drain onto the floor and ultimately still end up in the drain tank. The fuel is the coolant, and it has excellent thermal conductivity. At those temperatures heat dissipates rapidly, minimizing the difficulty of passive cooling. Even if the plant were turned into rubble, the heat would still dissipate into the surrounding environment and the salt would eventually freeze, all the while trapping the dissolved fuel and fission products. The freeze plug is a convenience to minimize damage to the reactor, but is not necessary for avoiding a large scale release of radiation--that is virtually impossible by any means. In the absurdly improbable event that some of the salt did boil away, that process itself would rapidly cool the bulk of the remaining salt, minimizing the release into the environment.
Unlike molten salts, the ceramic fuel elements of solid fueled reactors have very poor thermal conductivity and much higher melting temperatures. Worse yet, the rods contain more than a years worth of fuel, and trap all of the fission products over that period in a thermal insulator, with the volatiles inevitably released when cooling fails and the ceramic melts. That is a meltdown, and the escape of years worth of volatile fission products is indeed a very serious problem which simply doesn't happen with salts.
A thorium fueled molten salt reactor is continuously replenished, and contains no excess fuel. The magic of thorium is that it breeds in a thermal spectrum, and offers a simple chemical mechanism for reprocessing, not available in other fuel cycles. The thermal spectrum also requires much less fuel than the fast spectrum. Thanks to the fluid fuel, some volatile fission products like Xenon simply bubble out, and are continuously removed and sequestered. Others form stable salts with fluorine. All together, there is a minimum amount of fissile and decay heat present in any accident scenario, and the most dangerous long term hazards like cesium and strontium remain dissolved. The fluorine salts are among the most chemically stable compounds, and do not react violently with air or water. They are by far the safest place for nuclear fuel and fission products, where they can fissioned thoroughly, leaving virtually no waste.
With molten salt reactors, one has to be extremely creative to imagine disastrous accident scenarios. As a bonus, molten salt reactors were extensively researched, and about 10 years away in the 1970s. It might take a little longer today, but with a concerted effort, we could be mass producing reactors within 20 years, and well on our way to replacing all fossil fuel consumption later thus century. It is the one and only proven technology capable of that, so we ought to pick up where we left off without delay.