3. Derive the following rules of thumb for burnup calculations: (a) Equation (6.10); (b) Equation (6.11); (c) Equation (6.9). SBUmax=950,000tHMMWtd Several rules of thumb are commonly employed in burnup calculations. The first is the energy released by the fissioning of a mass of uranium-235: About 85% of the neutrons absorbed in uranium-235 actually cause fission. The remainder of the absorbed neutrons transmute 235U to 236U (and heavier isotopes) without fissioning. Hence