Working Party on Scientific Issues of Reactor Systems (WPRS)


WPRS mandate

Next WPRS Meetings: Feb 18th-22nd 2019

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: Uncertainty analysis aspects include: 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.


Expert Group on Reactor Fuel Performance Expert Group on Radiation Transport and Shielding Expert Group on Reactor Physics and Advanced Nuclear Systems (EGRPANS) Expert Group on Uncertainty Analysis in Modelling (EGUAM) International Reactor Physics Experiments (IRPhE) database Shielding Integral Benchmark Archive and Database (SINBAD) International CriticalitySafety BenchmarkEvaluation Project (ICSBEP) WPCNS ExpertGroup onUncertaintyAnalysis inCriticality SafetyAssessment (UACSA)

Meetings, workshops and conferences

WPRS and associated Expert Group meetings are held approximately every twelve months. The last meetings were held in February 2018. For more information, please contact Ian Hill

The next meetings will be held during the week of Feb 18th 2019

WPRS membership

Chair Kostadin Ivanov (USA)
Vice-Chair Hakim Ferroukhi (Switerland)
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: 8 March 2018