Communication Dans Un Congrès Année : 2024

OECD/NEA burst fission gas release benchmark based on regate and hatac-c2 tests

Résumé

The purpose of this paper is to report the main outcomes of the OECD/NEA burst Fission Gas Release (FGR) benchmark organised by the Expert Group on Reactor Fuel Performance (EGRFP). The benchmark aimed to simulate FGR under transient conditions, which may be governed by different “burst” mechanisms, challenging fuel performance codes. Nine organisations from eight countries participated in the benchmark exercise with different fuel performance codes. The benchmark consisted in the simulation of two tests included in the International Fuel Performance Experiments (IFPE) database: REGATE and HATAC-C2. Both tests used PWR fuel rods previously irradiated in commercial reactors to medium level of burn-up, then re-fabricated and ramp-tested in the SILOE materials testing reactor. The ramp test experimental conditions were characterised by transient powers high enough to trigger burst FGR and with durations short enough to minimise diffusional FGR. Moreover, two sensitivity calculations on the linear heat rate and the burst release model were made to deepen the understanding of the code results. As expected, the final values of predicted FGR showed large spread, due to difficult modelling and big uncertainties typically associated with FGR models, worsen by the additional burst challenge. Nevertheless, some participants managed to get close to the experimental measurement and different codes modelling capabilities were evaluated. In particular, the outcomes of the power sensitivity cases ruled out the dominant impact of power uncertainty on the burst FGR; whereas the burst model sensitivity demonstrated the need for a specific burst release model to not strongly under-estimate the results of FGR in a transient scenario. The benchmark provided a good opportunity to draw a state of the art of the burst FGR modelling capabilities of several fuel performance codes, and possibly opens the debate on how the same models may behave in a more severe transient scenario.

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Dates et versions

cea-04911645 , version 1 (24-01-2025)

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  • HAL Id : cea-04911645 , version 1

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Luana Giaccardi, Carlos Aguado, Isabelle Guenot-Delahaie, Adrien Dethioux, Pierre-Claude-Alain Simon. OECD/NEA burst fission gas release benchmark based on regate and hatac-c2 tests. TopFuel 2024, Sep 2024, Grenoble, France. ⟨cea-04911645⟩
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