Fuel Modelling Exercises for Coated Particle Fuel for Advanced Reactors Including Small Modular Reactors

The main purpose of this new Coordinated Research Project (CRP) is to support interested IAEA Member States in their efforts to enhance advanced modelling / simulation of TRISO fuel performance, improving the fundamental understanding of key TRISO fuel properties and radiation effects on the TRISO fuel properties in high-radiation environment, to deploy GEN-IV, SMR and MMR reactors which use TRISO- coated particle fuels.
The CRP will bring together specialists from IAEA MSs implementing active programmes in Generation-IV, SMR and MMR reactors that use TRISO- coated particle fuels, to share their national efforts.
The CRP will fill the gap in material properties used in fuel performance modelling and will contribute to the effective dissemination of knowledge and experience on the TRISO fuel performance analysis codes.
The main focus areas for this CRP are:
- To improve knowledge and fill the gaps of key TRISO fuel properties for codes development (diffusivities, creep, thermal conductivity, mechanical properties, SiC strength) with:-???????? New data (new experiments and/or data generated by multiscale modelling),
-???????? Experiments or other means such as multiscale modelling to obtain data to provide input to the codes,
-???????? Introduction of all important TRISO particle failure modes into fuel performance codes that will be used for the validation of TRISO fuel experiment;

- To gather the operating and transient envelopes for HTGRs for potential new measurements of fuel properties and new calculations;
- To develop the list of the FPs that are of importance to the selective criteria (e.g., highest yield, toxicity) to model their transport and release for licensing purposes, and methodology to define the importance of each FP;
- To develop a database based on existing experimental data and new dataset collection to validate codes;
- Code benchmark exercises, uncertainties propagation.