Thermal characteristics of Type 3 elements planned for installation in the SM-1, SM-1A and PM-2A plants were analyzed for both steady state and loss of flow transient conditions. Results of this analysis for steady state conditions indicate that the SM-1, SM-1A and PM-2A Type 3 cores will operate safely at design and scram conditions. All steady state analyses indicated minimum DNBR's for both design and scram conditions above the minimum criteria of 1. 5. Local nucleate boiling was noted in the SM-1 and SM-1A Type 3 cores. Loss of flow transient results indicate that all three Type 3 cores have minimum DNBR's above 1. 5 and are safe from burnout. Only the SM-1 A Type 3 core indicates bulk nucleate boiling during the loss of flow accident.
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