Abstract
In this study, the safety analysis technology and the system simulation technology for the nuclear power plant were integrated and a set of standardized procedures were created to build a dual RELAP5 whole plant simulation and analysis platform (the dual RELAP5 platform). The designed procedures are the platform development flowchart, the RELAP5 module execution file generation procedure, the implementation and verification procedure of the plant system simulation model, and the integration procedure of the plant system models. The Lungmen plant-specific dual RELAP5 platform (the Lungmen platform) was built successfully in this study. The development of the Lungmen platform was to verify the workability of the created standardized procedures. A commercial Windows-based computer simulation platform was used as the base of the Lungmen platform. There are two RELAP5 modules in the Lungmen platform. They are used to simulate the thermal-hydraulic phenomena in the reactor system, the containment system, and the power conversion system and to calculate the kinetic responses in the reactor core. The control systems, the safety protection systems, and the monitoring systems of the Lungmen plant were modeled using the platform built-in modules. The Lungmen platform has the designed simulation and calculation capabilities. It was applied successfully to support the plant startup test. The applications are the turbine-driven reactor feedwater pump performance curve calculations, the startup test simulations of the feedwater control system, the function table generations for the turbine-driven reactor feedwater pump flow demand and speed demand conversion, and the plant power test simulations and comparisons. In order to extend the applications of the Lungmen platform, the capability of the RELAP5 code and the simulation of the RELAP5 model were improved. The homogeneous equilibrium critical flow model was merged into the RELAP5 code. And the power conversion system RELAP5 simulation model of the Lungmen platform was updated according to the most up-to-date plant heat balance data.