Initial Stages of Benchmark Analyses of the Shutdown Heat Removal Tests Performed in the EBR-II Reactor
The International Atomic Energy Agency (IAEA) established in 2012 a coordinated research project (CRP) on EBR-II Shutdown Heat Removal Tests (SHRT). The CRP is being directed by Argonne and aims to improve design and simulation capabilities in fast reactor neutronics, thermal hydraulics, plant dynamics and safety analyses through benchmark analysis of a protected and an unprotected loss-of-flow test from the EBR-II SHRT program. Activities will include core physics studies and thermal-hydraulics/safety assessments.
Benchmark specifications provided by Argonne will be used by the twenty CRP participants from eleven countries to develop a neutronic model of the EBR-II core to assess reactor power distribution, decay heat parameters, and reactivity feedback coefficients for subsequent transient scenario safety analysis. Investigations of thermal hydraulics characteristics and plant behavior will focus on predicting natural convection cooling accurately by evaluating the reactor core flow and temperatures in comparison to experimental data. The ultimate evaluation will be in the prediction of the fission power history during an Anticipated Transient Without Scram (ATWS) by the coupled neutronic/thermal-hydraulic/structural models.