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Science and Technology of Nuclear Installations
Volume 2012, Article ID 950389, 10 pages
Research Article

CATHARE Assessment of Natural Circulation in the PKL Test Facility during Asymmetric Cooldown Transients

Bel V (Subsidiary of the Belgian Federal Agency for Nuclear Control), Walcourtstraat 148, 1070 Brussels, Belgium

Received 1 March 2011; Accepted 25 May 2011

Academic Editor: Alessandro Del Nevo

Copyright © 2012 Anis Bousbia Salah and Jacques Vlassenbroeck. 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.


Results of the CATHARE code calculations related to asymmetric cooldown tests in the PKL facility are presented. The test under consideration is the G2.1 experiment performed within the OECD/NEA PKL-2 project. It consists of carrying out a cooldown under natural circulation conditions in presence of two (out of four) emptied Steam Generators (SGs) and isolated on their secondary sides. The main goal of the current study is to assess the impact of a chosen cooldown strategy upon the occurrence of a Natural Circulation Interruption (NCI) in the inactive (i.e., noncooling) loops. For this purpose, three G2.1 test runs were investigated. The calculation results emphasize, mainly, the effect of the cooldown strategy, and the conditions that could lead to the occurrence of the NCI phenomenon.