Desc: Thorium, la face gâchée du nucléaire: Directed by Myriam Tonelotto. With Gilbert Johnston, Michel Prud'Homme, Friedhelm Ptok. Ever heard of the Thorium molten salt reactor? That's hardly surprising, as for 70 years, it has been inexplicably kept under wraps by the nuclear industry, despite the fact it could revolutionise energy production.