A utility is considering changing its fuel vendor and resulting fuel assembly design. The current fuel in the reactor is standard Westinghouse 17x17 fuel with a fuel rod pitch of 1.215cm fuel rod OD of 0.916cm. The clad thickness is 0.055cm. The new fuel design has a fuel rod pitch of 1.232cm and a fuel rod OD of 0.882cm with a clad thickness of 0.055cm. (Assume that there is no fuel-cladding gap). Considering that the fuel for both designs is 4.5% enriched, and that the reactor pressure and temperature conditions are 15.5MPa, and 304C How to determine the fission cross-sections for each lattice design?