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Consider a spherical fuel element of diameter D = 5 cm in pressurized (p = 145 kPa, TS ≅ 110 °C) stagnant water at temperature T∞= 20 °C

(a) Compute the maximum possible (and radially averaged) energy generation u'” with-out boiling the water.

(b) Repeat part (a) for a coolant velocity V∞=1 m/s.

(c) Assuming kfuel = 20 W/m∙K, determine the temperature of the center of the fuel for (a) and (b).