SERENA-Phase 2: Post calculations for TROI TS-4 Pre-calculation of TROI TS-5 and TS-6 Analysis of impact of melt properties on fuel coolant interaction - IRSN - Institut de radioprotection et de sûreté nucléaire Accéder directement au contenu
Rapport (Rapport De Recherche) Année : 2010

SERENA-Phase 2: Post calculations for TROI TS-4 Pre-calculation of TROI TS-5 and TS-6 Analysis of impact of melt properties on fuel coolant interaction

Résumé

SERENA-2 is the second phase of an OECD project related to Fuel Coolant Interaction involving a set of two series of experiments in the facilities KROTOS (CEA) and TROÏ (KAERI). In each case, the 3 first tests are done with an oxidic UO2/ZrO2 70/30 %w composition. The fourth tests (KS-4 and TS-4) are made with a UO2/ZrO2 80/20 %w composition, this slight modification being suspected to led to strong variations of behaviour during the explosion. The fifth tests are supposed to be done with a sub-stoechiometric U-O-Zr composition, named C-50. This composition is the only one in the SERENA project that might lead to an oxidation. The sixth test will be done with an oxidic composition containing other components, in particular iron oxide. We conduct an extended analysis on both the material properties (the energetic properties were not provided) and the potential impact of explosion strength. Although this was not required by SERENA PRG, we then propose blind pre-calculations of the TROI TS-5 (sub-oxidized melt) and TS-6 (realistic oxidic melt) tests. The overall conclusions of the study are the following. -The material properties for oxidic UO2/ZrO2 corium were evaluated with GEMINI and noticeable differences are found with properties proposed by SERENA AWG. We strongly recommend reconsidering the proposed properties with attention. -The revisited melt properties lead to important differences during the premixing regarding the solidification. Due to a smaller latent heat for the revised properties, the solidification is more effective. We estimate that, in TROI tests TS1 to TS4 (UO2/ZrO2 corium), the explosion strength is limited primarily by solidification. -The properties of C50 lead to an important reduction of solidification, resulting in a strong increase of the energetic of the explosion. The premixing in itself is not affected in MC3D evaluations by the material properties (in any case, the solidification is complete before reaching the bottom of the test section). -The oxidation might add a noticeable amount of energy of the explosion but the impact is smaller than the impact of variation of material properties, due to the small effective amount of potential energy of oxidation. -The evaluations suffer from the uncertainties attached to the present evaluation of material properties and oxidation effect of C-50. -The properties of the material for the sixth test lead to a very important decrease of solidification of the melt during the quenching. No solidification is predicted during the premixing of TS-6. -The explosion in TS-6 is limited by the water pool height and amount of discharged melt. The impact would be larger in a reactor situation with more melt and a larger pool deep. -In TS-6, the amplitudes of pressures at the wall are not so different compared to TS-4, but the peaks are larger by a factor of two. This induces an increase of explosion efficiency (transfer to kinetic energy) with a factor of 4.
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Dates et versions

irsn-04296159 , version 1 (20-11-2023)

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  • HAL Id : irsn-04296159 , version 1

Citer

Gregory Nicaise. SERENA-Phase 2: Post calculations for TROI TS-4 Pre-calculation of TROI TS-5 and TS-6 Analysis of impact of melt properties on fuel coolant interaction. DSR/SAGR 2010-171, IRSN - Institut de Radioprotection et de Sûreté Nucléaire. 2010. ⟨irsn-04296159⟩

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