Abstract The in-box Loss of Coolant Accident is a major safety concern for the Water Cooled Lithium Lead Breeding Blanket design. SIMMER-III code has been modified by University of Pisa and ENEA C.R. Brasimone to perform deterministic safety investigation of such accidental scenario. Thanks these modifications, this version of the code has unique features for dealing with the PbLi water reaction related phenomena. The reliability of the code requires a systematic validation activity, carried out applying a standard methodology based on a three-steps procedure and through qualitative and quantitative evaluations. The methodology was applied to the LIFUS5 campaign. Post-test analyses highlighted open issues of test execution and of experimental data, as well as code limitations and capabilities. Nevertheless, the modified version of SIMMER-III code for fusion application is able to predict the relevant thermal-hydraulic phenomena during PbLi/water interaction.

中文翻译：

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SIMMER-III代码在预测水冷锂铅繁殖毯“箱内冷却液丢失事故”中的评估

摘要 箱内冷却液损失事故是水冷锂铅育种毯设计的主要安全问题。SIMMER-III 代码已由比萨大学和 ENEA CR Brasimone 修改，以对此类意外情况进行确定性安全调查。由于这些修改，此版本的代码具有处理 PbLi 水反应相关现象的独特功能。代码的可靠性需要系统的验证活动，应用基于三步程序的标准方法并通过定性和定量评估进行。该方法应用于 LIFUS5 活动。测试后分析突出了测试执行和实验数据的开放问题，以及代码限制和功能。尽管如此，