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Science and Technology of Nuclear Installations
Volume 2012, Article ID 123426, 10 pages
Research Article

Analysis of Subchannel and Rod Bundle PSBT Experiments with CATHARE 3

CEA Grenoble, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, DEN, DM2S/SMTH, 38054 Grenoble, France

Received 28 March 2012; Accepted 1 July 2012

Academic Editor: Maria Avramova

Copyright © 2012 M. Valette. 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.


This paper presents the assessment of CATHARE 3 against PWR subchannel and rod bundle tests of the PSBT benchmark. Noticeable measurements were the following: void fraction in single subchannel and rod bundle, multiple liquid temperatures at subchannel exit in rod bundle, and DNB power and location in rod bundle. All these results were obtained both in steady and transient conditions. Void fraction values are satisfactory predicted by CATHARE 3 in single subchannels with the pipe module. More dispersed predictions of void values are obtained in rod bundles with the CATHARE 3 3D module at subchannel scale. Single-phase liquid mixing tests and DNB tests in rod bundle are also analyzed. After calibrating the mixing in liquid single phase with specific tests, DNB tests using void mixing give mitigated results, perhaps linked to inappropriate use of CHF lookup tables in such rod bundles with many spacers.