Development and application of a mathematical model to design the venting system for corridors in nuclear power plants

摘要

When a lost of coolant accident (LOCA) takes place in a nuclear power plant (NPP), venting system should play the role of pressure relief and protecting civil structure. In current projects, engineers need the assist of computational fluid dynamic (CFD) simulations to design the venting system. However, CFD simulation consumes much time and computing resources, and much useless work exist before construction drawing design phase. Note that corridor is a kind of compartment widely exist in NPPs, a one dimensional mathematical model is developed to simplify the design of venting systems for corridors in this paper. Then CFD simulations are applied to validate the mathematical model, using the design of HTR-PM600's corridor as a typical case. Finally, a step-by-step flow of design is developed. From this study we know: 1) the mathematical model can indeed provide a preliminary design of the venting system for corridors, which is a reasonable approximation to that provided by CFD simulation; 2) engineers only need to follow 4 steps to use the mathematical model, much useless work is saved; 3) the mathematical model performs well in the design of HTR-PM600's corridor.