Research on the Short-Term Heat Release and Pressure Relief System of HPR1000-based suppressive containment system under typical accidents

Abstract

To address the contradiction between safety and economy in double-layer concrete containment systems for nuclear power plants, this study focuses on China's third-generation nuclear technology. Based on the HPR1000 reactor design, a suppression containment system was previously proposed, and its response characteristics under typical accidents scenario were analyzed. However, parametric studies on factors influencing the heat removal capacity of the short-term heat release and pressure relief system (SHRPRS) were not conducted. Therefore, this paper investigates the effects of key parameters—including the gas space volume of the Multi-Functional Pool (MFP), cross-sectional area of the depressurization discharge pipes, and pipeline submersion depth—on the system's ability to suppress pressure and store non-condensable gases. Furthermore, configuration schemes for SHRPRS under different containment volumes to address Beyond-Design-Basis Accidents (BDBAs) are explored. Results indicate that for units without SHRPRS, containment volumes of 86,000 m³ and 70,000 m³ meet BDBA mitigation standards, while volumes of 60,000 m³ and 49,000 m³ fail to comply. For units equipped with SHRPRS, appropriate configurations of gas space volume and pipeline cross-sectional area enable all four containment volumes (86,000 m³, 70,000 m³, 60,000 m³, and 49,000 m³) to handle BDBA.