Whole plant simulation study on load rejection transient of CPR1000 employing advanced Mechanical Shim strategy

摘要

Load rejection is an extreme transient that may lead to a reactor scram and further threaten the safety of Nuclear Power Plants (NPPs) and thus should be well investigated. This paper presents the full load rejection transient simulation, the worst condition of load rejection transients, on the CPR1000 NPP. A whole plant simulation platform was first established. Then load rejection transient from full power to house load operation was simulated and analyzed. Results show that CPR1000 NPP equipped MSHIM control system can withstand this transient with enough safety margins and reactor power can be regulated to the reference power by the control systems without triggering a reactor scram. Furthermore, sensitivity analysis of different control parameters for steam dump and MSHIM control systems was conducted to investigate their influence. This paper can be a reference for whole plant load rejection study as well as modeling and simulations of NPPs. (C) 2020 Elsevier Ltd. All rights reserved.