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Conclusions of the ISP-47 containment thermal-hydraulics

Congress title:NURETH-12 (Nuclear Reactor Thermal Hydraulics) 
Congress location :Pittsburgh
Congress date :30/09/2007


The main objective of the ISP-47 is to assess the capabilities of Lumped Parameter (LP) and Computational Fluid Dynamics (CFD) codes in the area of containment thermalhydraulics. Following the recommendations made in the state-of-the-art report (SOAR) on 'Containment Thermal-hydraulics and Hydrogen Distribution' [5] this ISP was based on the application of different complementary experimental facilities and a progressive modelling difficulty. The three experimental facilities TOSQAN, MISTRA and ThAI have shown the quality of the provided experimental data suitable for CFD and LP code benchmarking in steady-states and transients situations (control of the initial and boundary conditions, and the accuracy of the measurement techniques). This mainly includes pressure transient and gas temperature field as in former exercises. Detailed gas velocity and gas concentration (air, steam and helium) fields were obtained for the first time in such an exercise. ISP-47 was executed in two main steps. For both steps, the comparison of experimental and calculated results shows a dominant impact of user effects, especially concerning the nodalisation, both for the CFD and LP models. Concerning gas concentrations and temperature profiles the spread of the submitted results and the corresponding deviations from the experimental data are comparable for both types of codes. Best blind predictions of atmospheric density stratification in step 2 (ThAI) were obtained by two LP models. In open post test calculations one CFD and one LP calculation could maintain the density stratification, too. Based on the results of the ISP-47 conclusions, recommendations have been developed.


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