NEA Mandates and Structures

Expert Group on Uncertainty Analysis in Modelling

Chair(s): Tomasz KOZLOWSKI, United States
Secretary:  Ian HILL
Member(s):All NEA member countries
Full participant(s): European Commission
Under the NEA Statute
Observer(s)(International Organisation): International Atomic Energy Agency (IAEA)
By agreement
Date of creation:30 June 2010
End of mandate:30 June 2020

Mandate (Document reference):

Mandate (Document extract):

Extract from document [NEA/SEN/NSC/WPRS(2018)3]


Under the guidance of the Working Party on Scientific Issues of Reactor Systems (WPRS) the Expert Group on Uncertainty Analysis in Modelling (EGUAM) will perform specific tasks associated with uncertainty analysis in modelling of coupled multi-physics analysis of present and future nuclear power systems. Reactor types considered include, but are not limited to the following:


The expert group will provide advice to the WPRS and the nuclear community on the scientific development needs (data and methods, validation experiments, scenario studies) of sensitivity and uncertainty methodology for modelling of different reactor systems and scenarios. 

The main activity will be focused on uncertainties in modelling LWR transients. In this context the objectives will be:


The deliverables of the EGUAM will include the following:

Meeting frequency

The EGUAM will meet once per year, in connection with WPRS meetings. An annual Workshop on Uncertainty Analysis in Modelling in Reactor Systems will be organised, in connection with the related benchmark activities. 

Links to other groups

The EGUAM will liaise closely with the NEA NSC Expert Group on Multi-physics Experimental Data, Benchmarks and Validation (EGMPEBV). The EGUAM will work in co-ordination with the WPNCS Expert Group on Uncertainty Analysis for Criticality Safety Analyses (UACSA) and with the CSNI Group on Analysis and Management of Accidents (GAMA). The EGUAM will also work in co-operation with the IAEA HTR UAM Coordinated Research Project (CRP).