Evaluation of several conditioning matrices for the management of radioactive metal beryllium wastes

Bouhier, Pauline; Cannes, Céline; Lambertin, David; Grisolia, Christian; Rodrigues, Davide; Delpech, Sylvie

doi:10.1016/j.jnucmat.2021.153464

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…As described above, MKPC matrices have been considered a promising alternative to OPC cementitious matrices for the immobilization of low- to intermediate-level radioactive aluminium alloys [ 6 , 7 , 9 , 11 , 12 , 17 , 18 , 50 ]. OPC alkaline matrices have a pH outside of the aluminium passive domain, which is primarily responsible for the corrosion of Al alloys, limiting the formation of the passive layer, as Pourbaix suggests [ 9 ], with a high risk of hydrogen release.…”

Section: Discussionmentioning

confidence: 99%

“…These pH critical values must be considered for the immobilization of the respective radioactive metal in the optimal cementitious matrix. According to this, other alternative cementitious matrices to the commonly used OPC are reported in the literature, such as brucite cement for beryllium [ 6 ], magnesium phosphate cement for aluminium [ 7 , 8 ], or OPC blended with secondary cementitious materials such as blast furnace slags (BFS) or fly ash (FA) for magnox alloy [ 9 ], which have demonstrated good behaviour.…”

Section: Introductionmentioning

confidence: 99%

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MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Fernández-García,

Alonso,

Bastidas

et al. 2024

Materials

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Magnesium Potassium Phosphate Cements (MKPCs) are considered a good alternative for the immobilization of aluminium radioactive waste. MKPC composition and moisture curing conditions are relevant issues to be evaluated. The corrosion of pure aluminium (A1050) and AlMg alloys (AA5754) with 3.5% of Mg is studied in MKPC systems prepared with different MgO/KH2PO4 (M/P) molar ratios (1, 2, and 3M) and moisture curing conditions (100% Relative Humidity (RH) and isolated in plastic containers (endogenous curing)). The Al corrosion potential (Ecorr) and corrosion kinetic (icorr and Vcorr) are evaluated over 90 days. Additionally, the pore ion evolution, the matrix electrical resistance, the pore structure, and compressive strength are analysed. The corrosion process of Al alloy is affected by the pH and ion content in the pore solution. The pore pH increases from near neutral for the 1M M/P ratio to 9 and 10 for the 2 and 3M M/P ratio, increasing in the same way the corrosion of pure Al (AA1050) and AlMg alloys (AA5754). The effect of Mg content in the alloy (AA5754) becomes more relevant with the increase in the M/P ratio. The presence of phosphate ions in the pore solution inhibits the corrosion process in both Al alloys. The MKPC physicochemical stability improved with the increase in the M/P ratio, higher mechanical strength, and more refined pore structure.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Fernández-García,

Alonso,

Bastidas

et al. 2024

Materials

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Reactivity of beryllium in aqueous solution from acidic to basic pH

Cannes,

Bouhier,

Lambertin

et al. 2023

Journal of Electroanalytical Chemistry

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Investigation of kinetics and mechanisms of metallic beryllium corrosion for the management of radioactive wastes

Bukaemskiy,

Caes,

Modolo

et al. 2024

MRS Advances

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Activated beryllium wastes are produced by the nuclear industry and have to be managed as radioactive waste during decommissioning and dismantling of nuclear facilities. One potential approach to the management of these wastes is their encapsulation and stabilization in cementitious matrices. The main issue with this conditioning is aqueous corrosion, leading to the hydrogen production and potential crack formation leading to a loss of confinement. To evaluate the suitability of different cement formulations, such as Ordinary Portland Cement (OPC) or magnesium phosphate cement for encapsulation of metallic beryllium, the corrosion behaviour of beryllium metal was investigated in solutions with different pHs. In alkaline solutions representative of OPC pore fluids (i.e. NaOH solutions with pH between 12.5 and 14), corrosion rates increase drastically with increasing pH. Investigations of the surface of the corroded beryllium samples by scanning electron microscopy indicate that pitting corrosion is the main corrosion mechanism under these conditions. Graphical abstract

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Evaluation of several conditioning matrices for the management of radioactive metal beryllium wastes

Cited by 5 publications

References 39 publications

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

MgO/KH2PO4 and Curing Moisture Content in MKPC Matrices to Optimize the Immobilization of Pure Al and Al-Mg Alloys

Reactivity of beryllium in aqueous solution from acidic to basic pH

Investigation of kinetics and mechanisms of metallic beryllium corrosion for the management of radioactive wastes

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