The effects of activated cooler power on the transient pressure decay and helium mixing in the PANDA facility
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The main outcomes of the experiments H2P6 performed in the thermal-hydraulics large-scale PANDAfacility at PSI in the frame of the OECD/NEA HYMERES-2 project are presented in this article. The experiments of the H2P6 series consists of two PANDA tests characterized by the activation ofthree (H2P6_1) or one (H2P6_2) cooler(s) in an initially stratified and pressurized containment atmosphere. The initial stratification is defined by a helium-rich region located in the upper part of the vesseland a steam/air atmosphere in the lower part. The activation of the cooler(s) results i) in the condensation of the steam in the vicinity of the cooler(s), ii) the corresponding activation of large scale naturalcirculation currents in the vessel atmosphere, with the result of iii) the re-distribution and mixing of theHelium stratification initially located in the upper half of the vessel and iv) the continuous pressuredecay. The initial helium layer represents hydrogen generated in a postulated severe accident. The main question to be answered by the experiments is whether or not the interaction of thedifferent, localized cooler units would be important for the application of numerical methods. The paper describes the initial and boundary conditions and the experimental results of the H2P6series with the suggestion of simple scaling laws for both experiments in terms of i) the temperaturedifference(s) across the cooler(s), ii) the transient steam and helium content and iii) the pressure decay inthe vessel. The outcomes of this scaling indicate that the interaction between separate, closely localizedunits does not play a prominent role for the present experiments. It is therefore reasonable to modelseveral units as one large component with equivalent heat transfer area and total water flow rate
Abstract
The main outcomes of the experiments H2P6 performed in the thermal-hydraulics large-scale PANDAfacility at PSI in the frame of the OECD/NEA HYMERES-2 project are presented in this article. The experiments of the H2P6 series consists of two PANDA tests characterized by the activation ofthree (H2P6_1) or one (H2P6_2) cooler(s) in an initially stratified and pressurized containment atmosphere. The initial stratification is defined by a helium-rich region located in the upper part of the vesseland a steam/air atmosphere in the lower part. The activation of the cooler(s) results i) in the condensation of the steam in the vicinity of the cooler(s), ii) the corresponding activation of large scale naturalcirculation currents in the vessel atmosphere, with the result of iii) the re-distribution and mixing of theHelium stratification initially located in the upper half of the vessel and iv) the continuous pressuredecay. The initial helium layer represents hydrogen generated in a postulated severe accident. The main question to be answered by the experiments is whether or not the interaction of thedifferent, localized cooler units would be important for the application of numerical methods. The paper describes the initial and boundary conditions and the experimental results of the H2P6series with the suggestion of simple scaling laws for both experiments in terms of i) the temperaturedifference(s) across the cooler(s), ii) the transient steam and helium content and iii) the pressure decay inthe vessel. The outcomes of this scaling indicate that the interaction between separate, closely localizedunits does not play a prominent role for the present experiments. It is therefore reasonable to modelseveral units as one large component with equivalent heat transfer area and total water flow rate
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