shown in Fig. 3 for the unprotected reactor core, SWEM maintains a significantly lower temperature. Conclusion Based on the results presented, radiation heat transfer between the pins to an isothermal surface can be sufficient to prevent meltdown during LOCA for some space reactor core designs. There seem to be several significant advantages that SWEM has over other LOCA mitigation systems. Some of the advantages are: the simplicity of design, lack of a control system and low additional mass. There are some potential problems. One is that, apart from running out of coolant, the wick can clog up. If a reactor system is operating for an extended period of time,
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