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Science and Technology of Nuclear Installations
Volume 2008, Article ID 874023, 16 pages
Review Article

International Course to Support Nuclear Licensing by User Training in the Areas of Scaling, Uncertainty, and 3D Thermal-Hydraulics/Neutron-Kinetics Coupled Codes: 3D S.UN.COP Seminars

1Department of Mechanical, Nuclear, and Production Engineering (DIMNP), University of Pisa, Via Diotisalvi 2, 56100 Pisa, Italy
2Department of Power Systems, Faculty of Electrical Engineering and Computing (FER), University of Zagreb, 10000 Zagreb, Croatia
3Department of Physics and Nuclear Engineering, Technical University of Catalonia, Avenida Diagonal 647, 08028 Barcelona, Spain
4Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, USA

Received 10 May 2007; Accepted 28 January 2008

Academic Editor: Cesare Frepoli

Copyright © 2008 Alessandro Petruzzi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Thermal-hydraulic system computer codes are extensively used worldwide for analysis of nuclear facilities by utilities, regulatory bodies, nuclear power plant designers, vendors, and research organizations. The computer code user represents a source of uncertainty that can influence the results of system code calculations. This influence is commonly known as the “user effect” and stems from the limitations embedded in the codes as well as from the limited capability of the analysts to use the codes. Code user training and qualification represent an effective means for reducing the variation of results caused by the application of the codes by different users. This paper describes a systematic approach to training code users who, upon completion of the training, should be able to perform calculations making the best possible use of the capabilities of best estimate codes. In other words, the program aims at contributing towards solving the problem of user effect. In addition, this paper presents the organization and the main features of the 3D S.UN.COP (scaling, uncertainty, and 3D coupled code calculations) seminars during which particular emphasis is given to the areas of the scaling, uncertainty, and 3D coupled code analysis.