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  • 1.
    Cui, Daqing
    Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Environmental Chemistry.
    A Review of Beneficial Effects of Reducing Environment at the Near-Field of KBS-3 Repository2011In: Huaxue jinzhan, ISSN 1005-281X, Vol. 23, no 7, p. 1411-1428Article, review/survey (Refereed)
    Abstract [en]

    The recent research activities, i.e. relevant publications and the author's experiments on chemical behaviors of spent nuclear fuel (SNF) and canister materials at near-field of KBS-3 deep geological repository were reviewed. The advantages of reductive substances at KBS-3 repository to the spent fuel disposal safety were discussed. Using data from literatures and experiments, the author demonstrated the blocking effect of hydrogen generated for iron canister corrosion on SNF dissolution, and discussed the reaction mechanism. It is also proved that the gamma radiation expected at the early stage of disposal and micro mole level oxidative species in water solution can only slightly enhance the corrosion rate of copper canister to mu m/y level, still 10(3) times slower than that at air saturated conditions. During a long period of time after copper canister leaks, under combined effects of iron canister material, hydrogen and fission product alloy particle catalysts, SNF dissolution can be depressed or blocked, and Most radiotoxic multivalent radionuclides U, Np, Tc and Se released from SNF can be reduced and precipitated. This paper supplies scientific bases for the sitting of a SNF repository at a stable reducing area, and designing of canisters with massive iron material.

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