The transient analysis of molten salt reactor reactivity insertion based on RELAP5/FLUENT coupled program

Abstract

BackgroundMolten salt reactor (MSR) is an ideal advanced reactor with good neutron economy, inherent safety and online refuelling.PurposeThis study aims to evaluate the transient behavior of reactive insertion transients of MSR.MethodsBased on the RELAP5/FLUENT coupling program and the establishment of the primary circuit model, the graphite-moderated channel type molten salt reactor was studied, and transient analysis was conducted when the reactor core was inserted with 0.000 1, 0.000 2, and 0.000 5 reactivities.ResultsThe results show that under the concerned reactivity insertion, the maximum temperature of the reactor core and the outlet temperature of the salt are both lower than the safety allowable limit due to the negative temperature reactivity of the reactor core.ConclusionsThis study verifies the good response ability of MSR to reactivity insertion events.

Keywords

• relap5/fluent
• molten salt reactor
• reactivity insertion
• thermal-hydraulic