Main results of study on the interaction between the corium melt and steel in the VVER-1000 reactor vessel during a severe accident performed under the MASCA project

Asmolov, V. G.; Zagryazkin, V. N.; Tsurikov, D. F.; Vishnevsky, V Yu; D’yakov, Ye. K.; Kotov, A. Yu.; Repnikov, V. M.

doi:10.1134/s1063778810140085

Cited by 6 publications

(2 citation statements)

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“…Despite these initial data, it was considered that sufficient knowledge on chemical distribution in these different phases in prototypic segregated liquid corium was still lacking at the beginning of the 2000s. A more systematic experimental investigation of the interaction between molten sub-oxidised U-Zr-O melts and iron (and steel) was launched in the framework of the OECD MASCA and MASCA2 Projects [12,13,66,67,[118][119][120][121][122][123]. The different compositions investigated in these Projects are reported in Table 3.…”

Section: High Temperature Regime (Above 2200 • C)mentioning

confidence: 99%

Corium Experimental Thermodynamics: A Review and Some Perspectives

Barrachin

2021

Thermo

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More than 30 years ago a specialist meeting was held at Joint Research Center Ispra (Italy) from 15 to 17 January 1990 to review the current understanding of chemistry during severe accidents in light water reactors (LWR). Let us consider that, at the end of the 1980s, thermodynamics introduced in the severe accident codes was really poor. Only some equilibrium constants for a few simple reactions between stoichiometric compounds were used as well as some simple correlations giving estimates of solidus and liquidus temperatures. In the same time, the CALPHAD method was developed and was full of promise to approximate the thermodynamic properties of a complex thermochemical system by the way of a critical assessment of experimental data, a definition of a simple physical model and an optimisation procedure to define the values of the model parameters. It was evident that a nuclear thermodynamic database had to be developed with that new technique to obtain quite rapidly prominent progress in the knowledge of thermochemistry in the severe accident research area. Discussions focused on the important chemical phenomena that could occur across the wide range of conditions of a damaged nuclear plant. The most pressing need for improved chemical models is identified with condensed phase mixtures to model the corium progression. This paper reviews more than 30 years of experimental data production in the field of corium thermodynamics. This work has been conducted through multiple international programs (EURATOM, ISTC, OECD) as well as through more specific studies conducted at the national scale. This research has been capitalised in specific databases such as NUCLEA and TAF-ID, databases developed at IRSN and at CEA, respectively, and are now used in degradation models of the severe accident simulation codes. This research is presented in this paper. In the conclusion, we outline the research perspectives that need to be considered in order to address today’s and tomorrow’s issues.

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Section: High Temperature Regime (Above 2200 • C)mentioning

confidence: 99%

Corium Experimental Thermodynamics: A Review and Some Perspectives

Barrachin

2021

Thermo

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“…Introduction. The cold crucible technology has been selected in this project because it has already proven his ability to melt corium thanks to Korean [1,2] and Russian [3,4] works but only for lower mass. Simulation of such induction furnace is quite well known in the CEA Marcoule for vitrifiction purposes [5,6].…”

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confidence: 99%