NEA Mandates and Structures

Working Party on International Nuclear Data Evaluation Co-operation (WPEC)

Chair(s): Osamu IWAMOTO, Japan
Secretary:  Michael FLEMING
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 October 1999
End of mandate:30 June 2022

Mandate (Document reference):

Mandate (Document extract):

Extract from document [NEA/SEN/NSC/WPEC(2019)3]

Impact Statement

The Working Party works to improve the quality and completeness of evaluated nuclear data, which represents our best understanding of the basic nuclear physics required to model nuclear systems, for use in science and technology and to promote the efficient use of resources through international collaboration.


The topics of the Working Party span the full range of nuclear data activities, including basic experimental measurements, theoretical developments, modelling/simulation of nuclear physics, formats and data structures, data processing, experimental data assimilation, verification and validation.


The Working Party will promote the exchange of information on all nuclear data related topics and foster the adoption of best practices. The Working Party will provide a framework for co-operative activities between the participants and the nuclear data programmes that they represent. The Working Party will assess the needs for nuclear data improvements and address those needs by initiating joint evaluation, methods development or measurement efforts. The outcomes that the Working Party facilitates will be reflected in major evaluated data files.

In the three-year period (2019-2022), the Working Party will set out to complete the following tasks:

The Working Party will liaise closely with other Nuclear Science Committee activities to ensure that data needs of nuclear science applications are properly addressed.


The deliverables of the WPEC during the present mandate are the following: