The Nuclear Science Committee Task Force on Material Damage held its first meeting on 22-23 October 1998 at NEA Headquarters. There were 16 participants from eight different member countries. The subject of the meeting was the 'redefinition of basic parameters for materials under irradiation', with a goal to promote a consensus among specialists on how to predict the irradiation response of nuclear structural materials, both from the very short and longer-term perspectives. The outcome of the task force meeting was a questionnaire addressed to the participants and containing five specific questions where the answers were collected and analysed.
Participation in the benchmarks was open until 1 May 1999. Twenty solutions for VENUS-1 and fourteen results for VENUS-3 were received and analysed. In addition to the standard methodologies described in the report, more advanced methods had been applied, in particular for the VENUS-3 benchmark. An improved level of accuracy was noted for these enhanced methods when applied to pressure vessel fluence calculations. The analysis carried out showed the superiority of the three-dimensional (3-D) transport methods compared to the two-dimensional (2-D) synthesis methods.
The report of the two VENUS benchmarks is entitled: Prediction of Neutron Embrittlement in the Reactor Pressure Vessel.
Under the guidance of the Working Party on Scientific Issues of Reactor Systems (WPRS), the expert group performed specific tasks associated with radiation transport and shielding aspects of current and future nuclear systems and accelerator-based irradiation facilities.
The Working Party on Scientific Issues and Uncertainty Analysis of Reactor Systems (WPRS) studies the reactor physics, fuel performance, and radiation transport and shielding in present and future nuclear power systems.