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Science and Technology of Nuclear Installations
Volume 2011, Article ID 958218, 9 pages
Research Article

The Best Estimate Plus Uncertainty Challenge in the Current Licensing Process of Present Reactors

1GRNSPG, University of Pisa, L. Lucio Lazzarino 1, 56100 Pisa, Italy
2Nucleoeléctrica Argentina S.A., UGCNAII, 2806 Lima, Argentina

Received 31 August 2010; Accepted 29 October 2010

Academic Editor: Juan Ferreri

Copyright © 2011 Francesco D'Auria and Oscar Mazzantini. 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.


Within the licensing process of the KWU Atucha II PHWR (Pressurized Heavy Water Reactor), the BEPU (Best Estimate Plus Uncertainty) approach has been selected for issuing of the Chapter 15 on FSAR (Final Safety Analysis Report). The key steps of the entire process are basically two: (a) the selection of PIE (Postulated Initiating Events) and (b) the analysis by best estimate models supported by uncertainty evaluation. Otherwise, key elements of the approach are (1) availability of qualified computational tools including suitable uncertainty method, (2) demonstration of quality, and (3) acceptability and endorsement by the licensing authority. The effort of issuing Chapter 15 is terminated at the time of issuing of the present paper, and the safety margins available for the operation of the concerned NPP (Nuclear Power Plant) have been quantified.