The Expert Group on Fuel Recycling and Waste Technology (EGFRW), operating under the auspices of the Working Party on Scientific Issues of Advanced Fuel Cycles (WPFC), launched an international benchmark of solvent extraction codes and process modelling applied to hydro-processes in 2021. The first phase of the benchmark focuses on the modelling of PUREX (TBP-based extractions) systems with uranium and nitric acid as reference species.
Flowsheet simulation is a crucial tool in the reprocessing of spent nuclear fuel. Modelling and simulation facilitate the design and optimisation of process flowsheets, elucidate experimental outcomes, and swiftly analyse the sensitivity of flowsheets to varying process parameters. This significantly reduces the need for costly and hazardous active experimental work. Consequently, numerous research organisations and groups have developed their own proprietary simulation codes. Some of these codes are publicly accessible, while others remain unpublished due to commercial or other constraints.
The international collaboration and comparison of simulation capabilities, while maintaining confidentiality, has long been a subject of discussion. To address this need and compare the performance of various simulation codes, the EGFRW has organised this benchmarking exercise. The overall objective of the benchmark is to provide a platform for experts from member states to compare simulation results from different codes using a common dataset and a suitable flowsheet for benchmarking.
A protocol for this benchmarking exercise, agreed upon by the EGFRW, begins with comparing the results of models for the extraction of uranium and nitiric acid into TBP using a common dataset. This is followed by applying the simulation codes to a simplified flowsheet for uranium extraction and backwashing. Upon completing this initial stage, subsequent stages may be agreed upon to increase the complexity of the models being compared. It is important to note that only the outputs of the models are compared, with no sharing of the underlying code.
Past and Current Benchmark Participants:
Access to the benchmark is open to all OECD/NEA member countries.
Activity lead: R. TAYLOR (NNL), Chair of the The Expert Group on Fuel Recycling and Waste Technology (EGFRW)
Member's working area on NEA Sharepoint (password protected | reminder)
