Working Party on Scientific Issues of Reactor Systems (WPRS)


 WPRS mandate

Next WPRS Meetings: 15-19 February 2021

Under the guidance of the Nuclear Science Committee, the Working Party on Scientific Issues of Reactor Systems (WPRS) studies the reactor physics, fuel performance, and radiation transport and shielding in present and future nuclear power systems. The Working Party also studies the uncertainties associated with modelling of these phenomena, particularly the modelling of reactor transient events.

The WPRS's objective is to provide member countries with up-to-date information to preserve knowledge on and develop consensus in the following areas:

Fuel performance aspects include: Reactor physics aspects considered include:

Radiation transport and shielding aspects include:

Reactor core thermal-hydraulics aspects include:

Uncertainty analysis aspects include:

Prior to the creation of the WPRS, a number of reactor physics benchmarks were undertaken.

Reactor types considered include, but are not limited to the following:

The WPRS liaises closely with other NEA working groups, especially those operating under the guidance of the Nuclear Development Committee (NDC) and the Committee on the Safety of Nuclear Installations (CSNI) in order to ensure the respective work programmes are complementary and to provide advice and support where required and undertake common work where appropriate. Particularly close working relationships are maintained with the Working Party on Scientific Issues of the Fuel Cycle (WPFC), the Working Party on Multi-scale Modelling of Fuels and Structural Materials for Nuclear Systems (WPMM) and other relevant NSC working parties.



Meetings, workshops and conferences

WPRS and associated Expert Group meetings are held approximately every twelve months. The last meetings were held in February 2020. For more information, please contact Ian Hill

The next meetings will be held during the week of Feb 15th 2021

WPRS membership

Chair Kostadin Ivanov (USA)
Vice-Chair Hakim Ferroukhi (SUI)
MembersAll NEA member countries
Full participantEuropean Commission (under the NEA Statute)
Observer (international organisation)International Atomic Energy Agency (by agreement)


For more information, please contact .

For more information on activities managed/supported by the NSC, please contact .

Last reviewed: 25 March 2020