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首页> 外文会议>NATO Advanced Research Workshop on The Environmental Challenges of Nuclear Disarmament Cracow, Poland 9-13 November 1998 >Radionuclide co-precipitation studies under repositiory conditions
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Radionuclide co-precipitation studies under repositiory conditions

机译：储存库条件下的放射性核素共沉淀研究

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摘要

Co-precipitation of some key elements from spent fuel and simulated fuel (SIMFUEL) supplied by Atomic Energy of Canada, Limited (AECL) REsearch was studied under simulated repository conditions. Apparent equilibrium concentrations from the spent fuel of actinides (Am, Cm, Pu, and Np) and rare earth elements (Eu) were similar to those encountered in a spent-fuel leaching test. The concentration values were lower than anticipated from the solubility of pure solid phases, e.g., Am(OH)3, Cm(OH)3, NpO2OH(aged), and Eu(OH)3. Co-precipitation phenomena and the formation of solid solutions are suggested as explanations for these low concentrations. The results indicate that the solution concentrations of these elements encountered in spent-fuel dissolution tests represent empirical upper limits for the given set of experimental conditions. Evaluation of the repository relevance of these empirical findings is not yet possible since the geo-chemical, near-field environment will be quite different from the environment in the present idealised experiments.
机译：在模拟储存库条件下，研究了由加拿大原子能有限公司（AECL）REsearch提供的乏燃料和模拟燃料（SIMFUEL）中某些关键元素的共沉淀。 act系元素乏燃料（Am，Cm，Pu和Np）和稀土元素（Eu）的表观平衡浓度与乏燃料浸出试验中的相近。该浓度值低于从纯固相（例如Am（OH）3，Cm（OH）3，NpO2OH（老化）和Eu（OH）3）的溶解度预期的值。建议共沉淀现象和形成固溶体作为这些低浓度的解释。结果表明，在乏燃料溶解测试中遇到的这些元素的溶液浓度代表了给定实验条件下的经验上限。由于地球化学的近场环境将与当前理想化实验中的环境完全不同，因此尚无法评估这些经验发现的存储库相关性。

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