Benchmark Analyses of the Shutdown Heat Removal Tests Performed in the EBR-II Reactor

IAEA-coordinated research project on benchmark analyses of two landmark EBR-II passive safety tests has been initiated. – Objective is to improve SFR design and analysis capabilities for predicting reactivity feedback and/or natural convective cooling characteristics. – Extensive data recorded during the EBR-II tests provide an excellent basis for code and model verification, validation, and qualification. The benchmark specifications describe the EBR-II geometry and plant components, provide recommended material properties and heat transfer correlations, and identify the initial conditions, power production conditions, and transient boundary conditions needed for the simulation of the tests. The ultimate assessment of success will be in the accuracy of the prediction of the fission power history during an Anticipated Transient Without Scram by the coupled neutronic/thermal-hydraulic/structural models. Evaluation of uncertainties for prediction of flow rates, fuel, cladding, coolant, and structure temperatures, and transition to natural circulation will also be within the scope of the project