Comment Re:More Paper Reactors (Score 1) 105
I looked at the eVinci website and it's hilarious. It tries so hard to avoid mentioning the major downsides, and even has a mock-up of it being transported on a trailer. The actual text notes that it needs a shipping container, presumably a very special one that it able to withstand the most severe road accident imaginable without leaking nuclear fuel all over the road.
It produces 5MWe, and 15MWth. That means it's pumping out a LOT of heat. Despite them claiming that it can work in any environment without cooling water, the reality is you need one hell of a heatsink of that. They quote "as little as" 2 acres but that will be the best case scenario. Already the portability claims are starting to crumble.
The only thing they say about spent fuel is that you can return it to them, presumably at considerable cost. Still no plan to deal with that mess, and they only mention refuelling once. That's a red flag - if they even can refuel it, there will probably be a load of waste generated from the process. They sound highly disposable.
Safety wise it's got the usual flaws where damage to the cooling system is a nuclear emergency situation. They claim that the control drums are passively safe. They must be spring loaded or something to rotate into the shutdown position unless held in the on position, but rotation in a system that experiences large temperature swings tends to be less reliable than gravity assisted rod insertion. If a drum jams you are in a pretty serious situation.