Abstract
The main purpose of this study is to establisha RELAP 1000 BOP system simulation model. This study relies on the integration and analysis of data relevant to the various components of AP 1000 pressurized water power plants. Furthermore, application of RELAP5 thermal-hydraulic analysissoftware is implemented to select the functional components that are appropriate in forging the simulation model. Specifically, the study is organized into three steps/stages, which are summarized as follows: 1. Collecting existing AP 1000 BOP system data, which then is subjected to thorough analysis and integration. 2. Using RELAP 5 software to build the corresponding BOP components, including main steam system; moisture separator re-heater system (MSR); the main turbine system (MTS); stem bypass system (TBS);main condensate system; low pressure feed-water heating system and the main feed-water system (FWS).After establishing the RELAP5 input mode for each BOP component, connect the input modes according to the actual flowing direction of steam and feedwater; subsequently, performing comparison tests with rated power data. Thus, this stage completes the verification/validation of AP 1000 BOP simulation model running on rated power data and the validation of heat balance design data. 3. Building the power conversion boundary and finishing automatic power conversion mode. For BOP simulation models that have operated successfully on rated power, introduces different design data that vary on the operating power (90%, 75%, 50% and 40 % respectively) to construct the boundary condition for each operating condition, and to set the logical criteria for identifying a power point. Finally, completion of the AP 1000 BOP conversion system is achieved by cross-examining the developed automatic power conversion modes with heat balance design data, and by performing fine-adjustments based on theresults.