Edsel, the fuels engineers will tell you it is just as safe, etc. The real problem I see with MOX fuel, aside from the greatly increased alpha levels (what plant has NEVER had fuel flea problems/broken pins ?) is the shifted neutron spectrum. There will be more Pu-239 buildup at EOC, which can produce a positive moderator temp. coefficient. In a PWR you have the ability to change boration if there are surprises in the flux profile change from the Pu-239 buildup, but less room to maneuver CEAs at a BWR. I'd love to see the analysis done for a BWR 100% load rejection at End of Core, and prove that the void coefficient with a MOX core would NOT violate adequate shutdown margin requirements. Color me skeptical.