With only a 300 year storage requirement maybe all the billions spent on Yucca Mt. can actually go to good use. Especially since the level of waste is 1% of a similar LWR.
No need to scrap current LWRs but given the alleged intrinsically safe nature the approval process should not be anywhere near the level of a LWR. Maybe 2X of a coal plant.
There are current designs. There are a few current operating reactor so a complete blank sheet of paper is not needed but certainly engineering an upscaling would be required.
Another plus, maybe we could start to reduce the number of lives lost in coal mines around the world.