Development of One-way-coupling Methodology between Severe Accident Integral Code MELCOR and Monte Carlo Neutron Transport Code SERPENT

Darnowski, Piotr; Potapczyk, Kacper; Gatkowski, Michał; Niewiński, Grzegorz

doi:10.1016/j.proeng.2016.08.358

Cited by 1 publication

(1 citation statement)

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“…It should be especially noted that at the moment not only the composition of the fuel melt and structural materials is unknown, but also its distribution over the reactor room (Darnowski et al 2016). Therefore, the development of a melt model is greatly complicated by its verification based on experimental data.…”

Section: Determining the Corium Isotopic Compositionmentioning

confidence: 99%

Neutronic modeling of a subcritical system with corium particles and water (from international benchmark)

Smirnov¹,

Bogdanova²,

Pugachev³

et al. 2020

NUCET

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After the accident at the Fukushima Daiichi NPP, the attention of the scientific community is riveted on how the consequences are being eliminated. Removing corium – a lava-like resolidified mixture of nuclear fuel with other structural elements of the reactor – remains the most difficult task, the solution of which can take several decades. It is extremely important to exclude the occurrence of any emergency processes during the removal of corium. The purpose of this work was to solve a coordinated hydrodynamic and neutronic problem characterized by a large number of randomly oriented and irregularly located corium particles in water as part of the development of a benchmark for this class of problems. Monte Carlo-based precision codes were used to perform a neutronic analysis. The positions of corium particles were determined from the numerical simulation results. The analysis results obtained using the codes involved showed good agreement for all the states considered. It was shown that the modern neutronic codes based on the Monte Carlo method successfully cope with the geometric formation and solution of the problem with a nontrivial distribution of corium particles in water. The results of the study can be used to justify the safety of corium handling procedures, including its extraction from a damaged power unit.

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Section: Determining the Corium Isotopic Compositionmentioning

confidence: 99%