Simulation of the PHEBUS FPT-1 experiment using MELCOR and exploration of the primary core degradation mechanism

Wang, Jun; Corradini, Michael L.; Fu, Wenjiang; Haskin, Troy Christopher; Zhang, Yapei; Tian, Wenxi; Su, G.H.; Qiu, Suizheng

doi:10.1016/j.anucene.2015.05.015

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Similar behavior was present for the best estimate MELCOR model, but the oxidation peak ended at~80 g (see Figure 7). A reduction in the oxidation occurred because of blockages of the flow, and it was also the case for PWRs; see [14,59,60]. The best-estimate model provides reasonable results close to the upper experiment uncertainty limit, and the results are comparable to the literature results for M2.2 and M2.1 (see Figure 7).…”

Section: Be Results For Fpt-1supporting

confidence: 76%

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Uncertainty and Sensitivity Analysis of the In-Vessel Hydrogen Generation for Gen-III PWR and Phebus FPT-1 with MELCOR 2.2

2021

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In this study, uncertainty and sensitivity analyses were performed with MELCOR 2.2.18 to study the hydrogen generation (figure-of-merit (FoM)) during the in-vessel phase of a severe accident in a light water reactor. The focus of this work was laid on a large generation-III pressurized water reactor (PWR) and a double-ended hot leg (HL) large break loss of coolant accident (LB-LOCA) without a safety injection (SI). The FPT-1 Phebus integral experiment emulating LOCA was studied, where the experiment outcomes were applied for the plant scale modelling. The best estimate calculations were supplemented with an uncertainty analysis (UA) based on 400 input-decks and Latin hypercube sampling (LHS). Additionally, the sensitivity analysis (SA) utilizing the linear regression and linear and rank correlation coefficients was performed. The study was prepared with a new open-source MELCOR sensitivity and uncertainty tool (MelSUA), which was supplemented with this work. The FPT-1 best-estimate model results were within the 10% experimental uncertainty band for the final FoM. It was shown that the hydrogen generation uncertainties in PWR were similar to the FPT-1, with the 95% percentile being covered inside a ~50% band and the 50% percentile inside a ~25% band around the FoM median. Two different power profiles for PWR were compared, indicating its impact on the uncertainty but also on the sensitivity results. Despite a similar setup, different uncertainty parameters impacted FoM, showing the difference between scales but also a significant impact of boundary conditions on the sensitivity analysis.

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Section: Be Results For Fpt-1supporting

confidence: 76%

“…Data taken from [18,29,30,58]. Wang M2.1 results[59,60]; SNL M2.2[58,61]; WUT M2.2-MELCOR 2.2.11 results from[29]. (Right)-PWR hydrogen generation for two studied cases and Zr-only generation.…”

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confidence: 99%