A thermohydraulic code for low temperature nuclear heating Reactor and its passive residual heat removal systems

A code, THSAC-LHRARRS, which is the thermohydraulic safety analysis code for the 200 MW Low Temperature Nuclear Heating Reactor (LTNHR) designed by China and its Passive natural circulation Residual Heat Removal System (PRHRS) is successfully developed in the present paper. The code is based on the mathematical and physical models of the LTNHR and its PRHRS, and it adopts numerical methods to correctly simulate real physical process of the systems. The heat-removal capacity in the steady state of the LTNHR-PRHRS is examined by THSAC-LHRARRS. The transition behaviors of the systems from start-up to stable operation are simulated. THSAC-LHRARRS can be used to evaluate inherent safety of the reactors that depend on natural circulation heat-removal capacity of the PRHRS. The good agreements between the results of the main models in THSAC-LHRARRS and those of the experiments show that the models are reliable and accurate.