They are the natural circulationflow analysis code (MC-FLOW), the core thermal hydraulic analysis code (MC-THAS) and the pulsed reactor transient analysis code (MC-TRAN).
Based on the motion equation and flowcirculation in the system, the flow analysis to reactor coolant system with density locks is given; the action and characteristics of density locks are explained.
The influence of the gas space on the top of an integral reactor vessel on the flow stability in the start up process of a natural circulation two phase flow system is studied experimentally.