Development of reduced-order thermal stratification model for upper plenum of a lead–bismuth fast reactor based on CFD

• DOI: 10.1016/j.net.2023.05.002
• Publication Date: 2023-05-03T09:48:44Z
• Authors: Tao Yang; Pengcheng Zhao; Yanan Zhao; Tao Yu
• Keywords: Plenum space; Stratification (seeds); Thermal Stratification; Natural circulation

After an emergency shutdown of a lead-bismuth fast reactor, thermal stratification occurs in the upper Plenum, which negatively impacts integrity reactor structure and residual heat removal capacity natural circulation flow. The research on reactors has mainly been conducted using experimental method, system program, computational fluid dynamics (CFD). However, equipment required for method is expensive, accuracy program unpredictable, resources time CFD approach are extensive. To overcome defects analysis, high-precision full-order model based technology prepared this study. Furthermore, reduced-order developed by combining proper orthogonal decomposition (POD) with Galerkin projection. A comparative analysis proposed reveals that can well simulate temperature distribution plenum rapidly elucidate interface characteristics during accident. Overall, study provides analytical tool determining mechanism reducing stratification.