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Science and Technology of Nuclear Installations
Volume 2013, Article ID 128305, 11 pages
http://dx.doi.org/10.1155/2013/128305
Research Article

Qualification of TRACE V5.0 Code against Fast Cooldown Transient in the PKL-III Integral Test Facility

1University of Pisa San Piero a Grado Nuclear Research Group (GRNSPG), Italy
2ENEA “Brasimone” Research Center, 40032 Camugnano, Italy

Received 4 March 2013; Accepted 14 June 2013

Academic Editor: Keith E. Holbert

Copyright © 2013 Eugenio Coscarelli 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.

Abstract

The present paper deals with the analytical study of the PKL experiment G3.1 performed using the TRACE code (version 5.0 patch1). The test G3.1 simulates a fast cooldown transient, namely, a main steam line break. This leads to a strong asymmetry caused by an increase of the heat transfer from the primary to the secondary side that induces a fast cooldown transient on the primary side-affected loop. The asymmetric overcooling effect requires an assessment of the reactor pressure vessel integrity considering PTS (pressurized thermal shock) and an assessment of potential recriticality following entrainment of colder water into the core area. The aim of this work is the qualification of the heat transfer capabilities of the TRACE code from primary to secondary side in the intact and affected steam generators (SGs) during the rapid depressurization and the boiloff in the affected SG against experimental data.