From the plant layouts to optimized LP and 3D PWR-KWU containment models for combustion risk assessment with GOTHIC 8.3(QA)

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-09-12 DOI:10.1016/j.nucengdes.2025.114459

L. Serra , A. Domínguez-Bugarín , G. Jiménez , C. Vázquez-Rodríguez , M. Braun , S. Kelm , L.E. Herranz

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引用次数: 0

Abstract

One of the key objectives of the severe accident management strategies is to preserve containment integrity and to prevent a large release of radioactive products into the environment. To evaluate containment response during a severe accident (SA), two GOTHIC 8.3(QA) models (LP and 3D) of a PWR-KWU containment have been developed in the framework of AMHYCO (EU-funded Horizon 2020 project). The LP and 3D models were compared for the in-vessel phase of a total loss of AC power scenario (SBO), with and without considering Passive Autocatalytic Recombiners (PARs). The two models showed consistent global trends, but the 3D model revealed local variations in hydrogen stratification, condensation, and temperature gradients that were not captured by the LP model. 3D results also highlighted the influence of 3D mesh resolution on stratification and flammability conditions, with finer meshes predicting different hydrogen accumulation flow patterns. As expected, PARs effectively reduced flammable volumes in both models, although 3D models yielded lower recombination rates due to local heterogeneities. Last, this study emphasizes the importance of the post-processing choices made by the user to identify safety relevant conditions with the potential to enhance accident management measures and the positioning of safety systems.

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从工厂布局到优化的LP和3D PWR-KWU密封模型，用于使用GOTHIC 8.3（QA）进行燃烧风险评估

严重事故管理战略的关键目标之一是保持安全壳的完整性并防止放射性产物大量释放到环境中。为了评估严重事故（SA）期间的安全壳响应，在AMHYCO（欧盟资助的Horizon 2020项目）的框架内开发了两个PWR-KWU安全壳的哥特8.3（QA）模型（LP和3D）。在考虑被动自催化重组器（PARs）和不考虑被动自催化重组器（PARs）的情况下，比较了交流功率完全损失（SBO）情况下容器内阶段的LP和3D模型。这两个模型显示了一致的全球趋势，但3D模型揭示了氢分层、凝结和温度梯度的局部变化，而LP模型没有捕捉到这些变化。3D结果还强调了3D网格分辨率对分层和可燃性条件的影响，更精细的网格预测了不同的氢气积聚流动模式。正如预期的那样，par有效地减少了两种模型中的可燃体积，尽管3D模型由于局部非均质性而产生了较低的重组率。最后，本研究强调了用户做出的后处理选择的重要性，以识别安全相关条件，并有可能加强事故管理措施和安全系统的定位。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.