temperature of the wick needed to be. By assuming a range of temperature such as 1250-1350 K, a corresponding saturation pressure was determined. The capillary size that is needed for such a pressure to be achieved has a range from 10-4 to 10~5 metres. Evaluating the entrainment limit for the worst break (clean, primary pipe break) indicated that the wick pore size only needed to be 10-3 metres. Thus, the pore size necessary to produce the desired wick-liquid pressure was more than sufficient to prevent entrainment. Computational Development and Results A need for some kind of emergency cooling system is demonstrated by the temperature-time plot in Fig. 3. A model was developed to determine a general temperature distribution of the entire core. A concentric ring model was developed by rearranging the reactor geometry form a pin-to-pin to a shell-to-shell geometry. This was done to simplify the method of generating a solution. A boundary condition was placed at the vessel wall allowing the energy to be rejected to space. The method of predicting the effect of a SWEM on the core temperature
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