Safety System Design and Stand-alone Direct Heat Removal System (SDHS) for Integrated Modular Water Reactor (IMR)

摘要

Integrated Modular Water Reactor (IMR) is adopted self-pressurized and naturalcirculation system to simplify plant equipment and to advance safety. The safety system of IMR is Standalone Direct Heat removal System (SDHS) of passive safety system to obtain high safety and simplified equipment which is difficult on large reactor The SDHS has passive SG cooler (PSGC) to remove decay heat, and the natural circulation in SDHS is very important to transfer the heat from reactor vessel to PSGC. This paper focuses design of SDHS and evaluation of one by thermal hydraulic code and test to confirm the feasibility of SDHS, especially under the condition of natural circulation heat removal with non condensable gas on SDHS.