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Science and Technology of Nuclear Installations
Volume 2011 (2011), Article ID 534689, 6 pages
http://dx.doi.org/10.1155/2011/534689
Review Article

Method for the Calculation of DPA in the Reactor Pressure Vessel of Atucha II

Gerencia de Licenciamiento y Control de Reactores Nucleares, Autoridad Regulatoria Nuclear, Avenida Del Libertador 8250, Ciudad Autónoma de Buenos Aires 1429, Argentina

Received 26 July 2010; Accepted 30 November 2010

Academic Editor: Alejandro Clausse

Copyright © 2011 J. A. Mascitti and M. Madariaga. 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.

Abstract

One of the limiting factors of the life of a nuclear power plant (NPP) is the state of the reactor pressure vessel (RPV). Embrittlement is the most important effect affecting RPV aging. The irradiation with neutrons, especially fast neutrons, is the primary cause of this embrittlement. NPP safe operation requires to ensure RPV integrity over its lifetime, threatened by the neutron radiation-induced embrittlement. In this paper, we identify the areas where the RPV neutron radiation is maximum and perform calculations of the displacement-per-atom (DPA) rate in those areas using the MCNP5 code. It was determined that the maximum DPA rate in the RPV wall with fresh fuel element (FE) is 3.76(3) × 10-12 s-1, it takes place in front of FEs BA42 and BL43, and it is symmetrical about the central channel, LG04, and LH03.