This paper presents the development of relationships between maximum fuel-element surface temperatures, coolant temperature rise, flow, pumping power, and operating steam temperatures for use in the design of a power-producing nuclear reactor. The heat output of a power-producing reactor is generally limited by the maximum metal-surface temperature which can be utilized without incurring excessive corrosion or dangerous conditions of boiling. The design of a reactor on the basis of maximum metal-surface temperature is particularly important in view of the fact that heat is not generated uniformly throughout the reactor and because of the fact that tolerances which must be established for manufacturing purposes may lead to further increases in hot-spot temperatures.

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