Ah, I did notice you were talking about fast reactors, then hastily slid back to thermal ones! Sorry. I guess my error reflects the fact that I think the therm

Ah, I did notice you were talking about fast reactors, then hastily slid back to thermal ones! Sorry. I guess my error reflects the fact that I think the thermal LFTR is more important. Re passive cooling in sodium breeder reactors: that's certainly interesting. I'd not heard about this.