NEA Mandates and Structures

Working Group on Codes and Standards (WGCS)

Chair(s): Secretary:  Thomas BUCKENMEYER
Member(s):All NEA member countries
Full participant(s): European Commission
Under the NEA Statute
Participant(s): India
Observer(s)(International Organisation): International Atomic Energy Agency (IAEA)
By agreement
Date of creation:04 June 2018
End of mandate:03 June 2021

Mandate (Document reference):

Mandate (Document extract):

Extract of document NEA/SEN/NRA(2018)5


The design, construction and operation of nuclear power plants (NPPs) is a multinational globalised industrial endeavour. It is unavoidable for any given country to use codes, materials, components or services that are produced by or provided from other countries. Consequently, the NPPs’ safety and reliability must be assessed by the regulator of the concerned countries while relying on foreign codes and/or vendors. The necessary reliance on foreign codes or products creates a very time-consuming and costly assessment process.

Code convergence and reconciliation is a very valuable but challenging long-term work. Its success is strongly dependent on global co-operation and voluntary technical support, in particular from Standards Development Organisations (SDOs) and the World Nuclear Association (WNA) Cooperation in Reactor Design Evaluation and Licensing (CORDEL) group.


In this context, the mandate of the Working Group on Codes and Standards (WGCS) is to facilitate and promote international co-operation, convergence and reconciliation1 of codes, standards and regulatory requirements for pressure-boundary components in nuclear power plants in order to:

To this end, the WGCS will prioritise tasks, according to the interest of the members, in order to:

Methods of Working

In terms of working methods, the WGCS will, according to its priorities:




1. Where convergence is to establish the same or equivalent codes requirements in order to reduce the areas in codes identified as “different”, reconciliation is to accept or conditionally accept differences in codes requirements by justifying their sufficiency in ensuring safety and reliability.