%0 Conference Paper
%F Oral
%T CATHARE-3: A first computation of a 3-inch break Loss-Of-Coolant Accident using both Cartesian and cylindrical 3D-meshes modeling of a PWR vessel
%+ CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN))
%A Prea, R.
%A Figerou, V.
%A Mekkas, A.
%A Ruby, A.
%< avec comité de lecture
%B NURETH-17
%C Xi'An, China
%I NURETH-17
%8 2017-09-03
%D 2017
%K System codes
%K 3D-vessel
%K Non-Conformal junctions
%K CATHARE-3
%K LOCA
%Z Physics [physics]/Nuclear Experiment [nucl-ex]
%Z Physics [physics]/Nuclear Theory [nucl-th]Conference papers
%X CATHARE-3 is the new version of the French thermal-hydraulic code for safety analysis of nuclearreactors. It is developed in the framework of the NEPTUNE project launched by the CEA, EDF, AREVANP and IRSN in 2001. CATHARE-3 V2.0 was delivered by December 2016.The paper will focus on a particular test-case, showing the new abilities of CATHARE-3. The PWR vesselhas been described using seven 3D-modules, with a Cartesian coordinate meshing for the core (with onecell per assembly in a horizontal section) and cylindrical coordinate meshing for the other vesselcomponents (downcomer, upper and lower plena …). Using this modeling, a 2,800s simulation of a 3-inchbreak Loss-Of-Coolant Accident (LOCA) in one of the PWR cold legs has been run and compared to resultswith a CATHARE-2 and CATHARE-3 “classical” modeling for the vessel (with only cylindrical grids).This computation has been made possible by the development of non-conformal junctions betweenCartesian coordinates and cylindrical coordinates. A similar computation is not possible with CATHARE2 because non-conformal junctions are not available. Many analytical verification test-cases of the nonconformal junctions have also been made, checking the mass-flow and energy-flow conservation at thenon-conformal junctions on various configurations. These test-cases, showing that an improvement formomentum equations is needed, are also presented in the paper.This 3D-vessel modeling also shows the abilities of CATHARE-3 to manage a large number of 3D-cells(about 7000 instead of less than 1000 for a typical CATHARE-2 3D-vessel modeling) thanks to the newnumerical methods available in CATHARE-3.This computation demonstrates the potential of CATHARE-3, which should reach the status of an industrialtool available for safety studies in 2019.
%G English
%2 https://cea.hal.science/cea-02434036/document
%2 https://cea.hal.science/cea-02434036/file/201700001126.pdf
%L cea-02434036
%U https://cea.hal.science/cea-02434036
%~ CEA
%~ IRSN
%~ DEN