Abstract In this study, a thermal-hydraulic analysis code has been developed for primary system of the integrated small modular pressurized water reactor IRIS (International Reactor Innovative and Secure). Numerical model of the primary system has been established, and characteristics of equipment and layout are considered. The sub-channel model is used for performance analysis of hot channel in the core. In modeling of the helically coiled steam generator, effects of secondary flow inside coiled tubes are taken into account. Based on the model established, the simulation code THAS (Thermal-Hydraulic Analysis code of SMRs) has been developed. To benchmark this code, steady state performance of the system has been calculated and compared with design parameters as well as results obtained with RELAP5. Furthermore, transient performance of the system is also simulated and compared with RELAP5. The comparison presents a good agreement, which confirms simulation capacity and accuracy of the THAS code.

中文翻译：

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一体化小型模块化压水堆一次系统热工水力分析程序开发

摘要 本研究开发了一体化小型模块化压水堆IRIS（国际反应堆创新与安全）一次系统的热工水力分析程序。建立了一次系统的数值模型，并考虑了设备和布局的特点。子通道模型用于核心热通道的性能分析。在螺旋盘管蒸汽发生器的建模中，考虑了盘管内二次流的影响。在建立的模型的基础上，开发了仿真代码THAS（SMR的热液压分析代码）。为了对该代码进行基准测试，计算了系统的稳态性能，并将其与设计参数以及使用 RELAP5 获得的结果进行了比较。此外，还对系统的瞬态性能进行了仿真并与 RELAP5 进行了比较。比较结果一致，证实了 THAS 代码的模拟能力和准确性。