Abstract
In this paper, a Direct Reactor Auxiliary Cooling System (DRACS) has been designed to remove the core decay heat after accidents such as the core scram to ensure the safety of a 10 MW pool-type Small Modular Lead-based Reactors (SMR). The DRACS is characterized by dual heat sinks, i.e., water and air. The protect loss of flow accident (PLOFA) has been simulated by RELAP5 to illustrate the thermal–hydraulic feathers in both the primary circuit system and the DRACS. The natural circulation was established in the flow path of the primary circuit where the DRACS was in operation. The complete evaporation of water caused obvious variation of LBE temperature, however, affected LBE mass flow rate marginally. Moreover, the DRACS was efficient in removing core decay heat and preventing LBE solidification under different initial conditions. The conclusions from the current work would help with the designs of decay heat removal systems for SMR.
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