In this paper, a simulation framework of analysis is presented aiming at evaluating the safety performance of the Residual Heat Removal system (RHRs) of the Chinese High Temperature Gas-Cooled Reactor - Pebble Bed Modular (HTR-PM) under uncertain operation conditions, and components and equipments failures. A transparent and fast model of the passive system has been implemented in MATLAB to reproduce the three-interconnected natural circulation trains of the RHRs, for removing the residual heat of the reactor core after a reactor shut-down. The model is characterized by a one-dimensional mono-phase moving fluid, whose operation is based on thermal-hydraulic (T-H) principles. The model is coded into a Monte Carlo (MC) failure engine for sampling single and multiple components faults at random times and of random magnitudes. Accidental transients of the system are simulated, highlighting equipment contribution to system failure.
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