This MELCOR 2.2 severe accident was used to study two accident scenarios in the Chinese high temperature reactor HTR-PM. A model of the reactor core, thermal insulator and metal structures, reactor pressure vessel and the residual heat removal system was created using the information from the open source literature. A steady state calculation was performed and used as an initial condition for the simulation before the accident sequence commenced. In pressurized loss of forced cooling accident the coolant helium flow was decreased to zero and the reactor was shut down. A natural convective flow was established in the pebble bed core due to the high pressure in the primary system and the peak fuel temperature during the accident was 1438 K. In de-pressurized loss of forced cooling accident the pressure of the primary system is lost causing the coolant flow to stop and reactor to shut down. The heat was removed from the core mainly by thermal radiation and heat conduction leading to the peak fuel temperature of 1730 K. The results were compared to previously published simulation data obtained using a THERMIX code. The peak fuel temperature results didn’t differ significantly between the both simulations, with the main differences probably caused by the uncertainties in the input parameter used in this study. In the future work, MELCOR code is planned to be used in the simulation of fission product release and transport in the pebble bed high temperature reactors during accident normal operation and in accident conditions.