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A study on concrete degradation during molten core/concrete interactions

机译:熔融核/混凝土相互作用过程中混凝土的降解研究

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A series of MCCI tests was performed in COTELS project at NUPEC to examine concrete degradation characteristics during MCCI with and without water addition onto the debris. Molten stainless steel or a mixture composed of UO_2, ZrO_2, Zr and stainless steel was slumped into a two-dimensional concrete trap, where volumetric decay heat generation was simulated by an induction heating technique. The results of dry MCCI tests implied that concrete ablation was dominated by melting of aggregates when the debris was crusted and cement was thermally weaker than aggregates. Without presence of stable crust, unmolten aggregates were possible to relocate upward due to the density difference from the debris. Concrete responses under a wet condition showed a tendency that water migrated into thermally degraded concrete. A preliminary water migration model was incorporated into COCO code for transient heat conduction. The prediction by COCO code agreed with the tendency of concrete thermal responses observed in the dry and wet MCCI tests.
机译:在NUPEC的COTELS项目中进行了一系列MCCI测试,以检查在有或没有添加水到碎屑中的MCCI过程中混凝土的降解特性。将熔融的不锈钢或由UO_2,ZrO_2,Zr和不锈钢组成的混合物倒入二维混凝土阱中,在其中通过感应加热技术模拟体积衰减发热。干燥MCCI试验的结果表明,当碎屑碎裂且水泥的热强度低于集料时,混凝土的烧蚀主要是由集料的熔化引起的。如果没有稳定的外壳,由于与碎屑的密度差异,未熔化的骨料可能会向上移动。混凝土在潮湿条件下的反应显示出水迁移到热降解混凝土中的趋势。初步的水迁移模型已纳入COCO代码中以进行瞬时热传导。 COCO规范的预测与在干式和湿式MCCI测试中观察到的混凝土热响应趋势一致。

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