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Scaling Analysis of Thermal-Hydraulic Integral Systems: Insights from Practical Applications and Recent Advancements
Nuclear Science and Engineering ( IF 1.2 ) Pub Date : 2020-06-12 , DOI: 10.1080/00295639.2020.1753419
Cesare Frepoli 1
Affiliation  

Abstract Integral systems test (IST) facilities, which are sometimes referred to as integral effects tests (IETs), play a key role in the design, assessment, and certification of innovative reactor designs. Data obtained using such facilities have been used to benchmark the best-estimate safety analysis computer codes used to evaluate nuclear plant safety. They have also been used to assess the effectiveness of safety system functions under simulated accident conditions. Scaling analyses are an important component in determining the applicability of an evaluation model for its intended purpose. Evaluation models can only approximate the physical behavior of postulated events on a prototype, and the judgment of their adequacy relies heavily on their capability in predicting IETs that were designed to simulate the events analyzed. With few exceptions, all ISTs are subscale representations of the power plants they are built to represent. As thermal-hydraulic computer codes are benchmarked to an IST database, the most important challenge for the analyst is the development of convincing scaling similarities between the IST and the plant. Unless such rules are clearly identified, it would not be possible to extend conclusions from the assessment of the tools against subscale data to the plant scenario time and geometry scales.

中文翻译:

热液压整体系统的标度分析:来自实际应用和最新进展的见解

摘要 积分系统测试 (IST) 设施有时也称为积分效应测试 (IET),在创新反应堆设计的设计、评估和认证中发挥着关键作用。使用此类设施获得的数据已被用于对用于评估核电厂安全的最佳估计安全分析计算机代码进行基准测试。它们还被用于评估模拟事故条件下安全系统功能的有效性。缩放分析是确定评估模型对其预期目的的适用性的重要组成部分。评估模型只能近似于原型上假设事件的物理行为,对其充分性的判断在很大程度上取决于它们预测旨在模拟所分析事件的 IET 的能力。除了少数例外,所有 IST 都是它们所代表的发电厂的子尺度表示。由于热工水力计算机代码以 IST 数据库为基准,分析人员面临的最重要挑战是在 IST 和工厂之间开发令人信服的缩放相似性。除非明确确定此类规则,否则不可能将根据子尺度数据评估工具的结论扩展到工厂场景时间和几何尺度。
更新日期:2020-06-12
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