Question: 1. Consider a spherical fuel element in a pebble bed reactor. Assume that the fuel element is hollow inside (0 S r S R/2) and

1. Consider a spherical fuel element in a pebble bed reactor. Assume that the fuel element is hollow inside (0 S r S R/2) and the outer layer consists of two composite materials (R/2 S r S R). The outer layer contains the fuel with a constant uniform source of SO n/(cm3s). For simplicity assume vacuum outside the fuel element and solve the steady state one-speed diffusion equation to nd the ux in the outer fuel layer of the fuel element

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