Sudden Discharge of Gas Mixture in a Confined Multi-Compartments
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
O9-2 OECD NEA Session on Analysis and Management of Accidents (Best-estimate methods and uncertainty

Domenico Paladino (Paul Scherrer Institut)
Guillaume Mignot (Paul Scherrer Institut)
Nejdet Erkan (Paul Scherrer Institut)
Robert Zboray (Paul Scherrer Institut)
Ralf Kapulla (Paul Scherrer Institut)
Michele Andreani (Paul Scherrer Institut)


The paper presents the results of a series of tests in the PANDA facility, performed within the OECD/SETH-2 project, focusing on the evolution of gas distribution in one subdivided compartment resulting from the sudden opening of a connection with a second compartment initially at higher pressure and filled with a mixture of different composition. This situation occurs in the case of the sudden opening of a rupture disk (or hatches) – and could be related to the EPR design. Gas transport mixing and distribution within the containment compartments is driven by the pressure difference between the volumes in the early phase of the test, and by temperature gradient and gas mixture concentration difference after that the pressure between the vessels has been equalized. The analysis performed with GOTHIC code and presented in this paper aims at complementing the interpretation of the physical phenomena taking place during the test evolution and inferred from the measurement results.

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