Working Party on Multi-scale Modelling of Fuels and Structural Materials for Nuclear Systems (WPMM)

The Working Party on Multi-scale Modelling of Fuels and Structural Material for Nuclear Systems (WPMM) was established to deal with the scientific and engineering aspects of fuels and structural materials, aiming at establishing multi-scale models and simulations as validated predictive tools for the design of nuclear systems, fuel fabrication and performance. The WPMM’s objective is to promote the exchange of information on models and simulations of nuclear materials, theoretical and computational methods, experimental validation, and related topics. It also provides member countries with up-to-date information, shared data, models and expertise. The Working Party assesses nuclear modelling improvement needs and addresses these needs by initiating joint efforts. The WPMM will review and evaluate the multi-scale modelling and simulation techniques currently employed in the selection of materials used in nuclear systems. It will also provide advice to the nuclear community on the developments needed to meet the requirements of modelling for the design of different nuclear systems.

The WPMM liaises closely with other NEA working groups, especially those operating under the guidance of the Nuclear Science Committee (NSC) in order to ensure the complementarity of the respective work programmes. Particularly close working relationships are maintained with the Working Party on Scientific Issues of the Fuel Cycle (WPFC), the Expert Group on Innovative Fuels (EGIF), the WPFC Expert Group on Innovative Structural Materials (EGISM), the Expert Group on Accident-tolerant Fuels for Light Water Reactors (EGATFL), the  Expert Group on Multi-physics Experimental Data, Benchmarks and Validation (EGMPEBV), the Expert Group on Reactor Fuel Performance (EGRFP) and the NEA Project on Thermodynamics of Advanced Fuels International Database (TAF-ID).

Publications and reports
WPMM expert groups

The WPMM is structured into three areas of focus: general multiscale modelling methods, multiscale modelling of nuclear fuels and structural materials modelling.

WPMM organigram

WPMM members

WPMM working area (password protected | reminder)

Related external workshops and conferences

External publication

Tonks, M. et al., "Unit mechanisms of fission gas release: Current understanding and future needs", Journal of Nuclear Materials, vol. 504, June 2018, Elsevier, pp. 300-317, doi: