Safety assessment for accident of cooling loop failure (ACLF) in lunar nuclear power reactor (LNPR)

► The non-linear expression of the ACLF in the LNPR is done by the SD. ► Time step is used for the frequent variation expression in the moon. ► The successful possibility increases as the period increases. ► The analysis of the events is imaginary situation in the lunar colony. The safety assessment of an accident in the lunar base power plant is investigated for the stability of the operation. The lunar surface reactor is modeled for this study. The accident of cooling loop failure (ACLF) is one of the important scenarios for the virtual case in the moon nuclear power plant (NPP). The newly designed lunar nuclear power reactor (LNPR) is suggested for the commercial purpose. The system dynamics (SD) is used for the simulation of the safety assessment. The cyclic variation of the lunar surface temperature can affect to the physical situation of the coolant, which is expressed by the time step. The result shows the performance possibility of the long term cooling increases slightly in the short period of the time step. The dynamical simulation of the lunar environment is performed for the conceptual design of the NPP.