Oxidation-enhanced emission of ruthenium from nuclear fuel

Ronneau, Claude; Cara, Jean; Rimski-Korsakov, A.A.

doi:10.1016/0265-931x(95)91633-f

Cited by 15 publications

(7 citation statements)

References 4 publications

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“…3 [7,8] except that, in the case of pure RuO 2 , release rates are lower due to the absence of matrix effect which will be discussed later. These results fall in accordance with those obtained by Seiler and Froment [9].…”

Section: The Emission From Pure Ruo 2 Pelletsmentioning

confidence: 97%

Study of Ru released under accidental conditions by overheated nuclear fuel: the emission of Ru and U

Froment¹,

Cara²,

Vanbegin³

et al. 2001

Radiochimica Acta

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The emission of uranium and ruthenium oxides from overheated nuclear fuel is a complex phenomenon which depends on the fuel matrix, on temperature, on the oxygen potential of the amosphere in contact and on the emission sequence. All these factors influence the properties of particles before their dispersion in the reactor containment building and in the environment: these properties are, among others, surface composition, particle size, and, as a consequence, weathering rates in the environment. Emission in air increases the solubility of U-oxides mainly. This first paper describes the main physico-chemical characteristics of condensation particles released by overheated U and Ru oxides mixtures, in small-scale laboratory simulations.

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Section: The Emission From Pure Ruo 2 Pelletsmentioning

confidence: 97%

Study of Ru released under accidental conditions by overheated nuclear fuel: the emission of Ru and U

Froment¹,

Cara²,

Vanbegin³

et al. 2001

Radiochimica Acta

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“…Therefore, a careful interpretation of the results of thermodynamic calculations is required. The ruthenium overall partial pressure is calculated as the sum of all gaseous species RuO z(g) : 4 p RuOz (27) where γ Ru is the ruthenium activity and is set, on a first approximation, to unity. For each ruthenium species, its partial pressure is evaluated using the equilibrium constant (Eqs.…”

Section: Ru Release Modellingmentioning

confidence: 99%

“…The ruthenium release from fuel has been observed to be extremely impacted by the redox properties of the surrounding atmosphere [4][5][6][7]. Moreover, it has been observed that ruthenium can be highly released from fuel in highly oxidizing conditions with somewhat high temperatures (e.g., under air atmosphere, ruthenium was observed to be fully released from fuel fragments for temperatures higher than 1973 K in the MCE1 AECL test series [8]).…”

Section: Introductionmentioning

confidence: 99%

Ruthenium release from fuel in accident conditions

Brillant¹,

Marchetto

Plumecocq

2010

Radiochimica Acta

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During a hypothetical nuclear power plant accident, fission products may be released from the fuel matrix and then reach the containment building and the environment. Ruthenium is a very hazardous fission product that can be highly and rapidly released in some accident scenarios. The impact of the atmosphere redox properties, temperature, and fuel burn-up on the ruthenium release is discussed. In order to improve the evaluation of the radiological impact by accident codes, a model of the ruthenium release from fuel is proposed using thermodynamic equilibrium calculations. In addition, a model of fuel oxidation under air is described. Finally, these models have been integrated in the ASTEC accident code and validation calculations have been performed on several experimental tests.

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“…The importance of potential ruthenium release was considered only in the vitrification phase of spent fuel processing [2]. Further investigations and the Chernobyl accident indicated that under air ingress conditions the metallic ruthenium can be oxidised and radioruthenium in form of gaseous RuO 3 and RuO 4 could be released in high degree (%100%) from the damaged fuel [3].…”

Section: Introductionmentioning

confidence: 99%