Preliminary assessment of a reactivity insertion event in the Hermes FHR low power demonstration reactor

Kairos Power, the leading developer of Fluoride-salt-cooled High-temperature Reactor (FHR) technology, has made significant progress in its modeling capabilities. In support of Kairos Power's PSAR submittal to the USNRC, the thermal hydraulics systems code KP-SAM was used to demonstrate the capability to model a reactivity insertion accident in a proposed FHR low power demostration reactor, dubbed "Hermes." This activity highlights progress made in the use and development of KP-SAM, which is an internally developed variant of Argonne National Laboratory's advanced systems code System Analysis Module (SAM). This activity also exemplifies Kairos Power's ability to perform detailed transient calculations.