Verification of neutronics and thermal-hydraulics coupling method for FLUENT code using the MSRE pump startup, trip data

The major objective of the present study is to verify a method for FLUENT code applying user defined function (UDF) which enables coupling simulation neutronics and thermal-hydraulics molten salt fast reactor based on one-point kinetics. UDF with added logic control rod drive (CRD) linked analyze reactivity change when fuel pump MSRE was started tripped. These experiments were carried out under zero power conditions. core modeled cylinder same flow channel area as MSRE, in model can compensate changes that accompany rate changes. When started, response overshoots because form close stepwise change. This behavior has been reproduced almost correctly using simple proportional-integral-derivative (PID) controller program. constant changed also investigated. In trip experiment, transient relatively moderate. logic. simulations show programmed correctly, discretized point kinetic prompt jump assumption be applied combination code-to-code benchmarks already performed.