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Communication Dans Un Congrès Année : 2022

Synthesis of the ASTEC V2.2 code validation vs. experimental data

Patrick Chatelard
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Résumé

Significant efforts are being continuously put for many years into the assessment of the severe accident integral code ASTEC developed by IRSN, through comparison either with results of the most important international experiments or with results of other severe accident simulation codes. These efforts are done in first priority by the IRSN code developers and also by numerous partners, in particular in the frame of the on-going NUGENIA TA2 ASCOM project. The third major version of the ASTEC V2 series, V2.2, was released in April 2021 to the ASTEC community. With respect to former V2.1, main progress was on the physical models and an extension of the code capabilities, but also on physico-numerical challenging issues (improved robustness, reduced sensitivity to “cliff” effects). In particular, several improvements may be quoted hereafter: the RCS thermal-hydraulics new 6 equations scheme along with a special attention paid to shut-down state conditions; several core degradation new models to better cope with BWR and SFP configurations; a consolidated version of the reflooding model for severely damaged cores; models addressing the corium behavior in the lower plenum and the IVR related issues; an extension of the kinetics data for the RCS gaseous phase chemistry model through an account for more elements (key-issue to evaluate the iodine gas/aerosol partition entering the containment); several iodine new models in the containment (radiolytic decomposition of metallic iodide aerosols, decomposition of iodine oxides…). This paper aims at providing a synthesis of the ASTEC V2.2 assessment vs. experimental data. After a brief reminder of the ASTEC validation strategy, the ASTEC V2.2 validation matrix is depicted, including more than 300 experimental tests conducted at various scales in ~70 different facilities worldwide. Then some V2.2 results are given and discussed for a few representative applications. These calculation examples are selected in a way to cover diverse aspects of severe accident phenomenology, i.e. to cover both in-vessel and ex-vessel processes, in order to provide a good picture of the ASTEC V2.2 modelling capabilities. Finally, the main lessons drawn from this validation task are summarized, along with an evaluation of the current physical modelling relevance and an identification of the ASTEC V2.2 validity domain. Based on those outcomes, some prospects for further improvements are put forward.
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Dates et versions

hal-03677729 , version 1 (24-05-2022)

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  • HAL Id : hal-03677729 , version 1

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Patrick Chatelard, Laurent Laborde. Synthesis of the ASTEC V2.2 code validation vs. experimental data. The 10th European Review Meeting on Severe Accident Research (ERMSAR-2022), ERMSAR, 2022, KARLSRUHE, Germany. ⟨hal-03677729⟩
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