Is that true with regard to the storage tanks?
I'm an engineer with a professional passing interest in nuclear power. I've read numerous *shudders to say it* Wikipedia articles on the 1950's experiments into molten salt reactors and thorium reactors.
Is the energy density of the salt sufficiently high that decay heat is only a limited meltdown/containment failure risk? So passive cooling arrangements and heat sinks are sufficient.
Are tanks such as these really going to the that highly irradiated, the 1950's salt reactors, if the articles are correct, were routinely left unattended to "trip" off using this facility. That would suggest regular occurences of emptying the drain down tanks which would be unlikely if there was a high radiological risk.
It is however nice to see some new fast reactor concepts being considered it must be better to burn through our waste and create ultimate waste that only requires 100's of years of storage rather than 10,000's.