A Whole-Core Transient Thermal Hydraulic Model For Fluoride Salt-Cooled Reactors

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-10-30 DOI:10.1115/1.4063902

Sriram Chandrasekaran, Srinivas Garimella

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Abstract

Abstract A thermal hydraulic model is developed for a solid pin-fueled fluoride-salt-cooled small modular advanced high temperature reactor (SmAHTR). This pre-conceptual SmAHTR was developed by the Oak Ridge National Laboratory (ORNL). For the fuel assembly configuration investigated in this study, the fuel and non-fuel pins are arranged in a hexagonal layout. The molten FLiBe salt coolant flows parallel to the bank of pins. A finite volume model is developed and used to compute temperatures in the solid regions (fuel and non-fuel pins, and the graphite reflectors) in the core. The temperature, flow, and pressure profiles for the coolant flowing through the pin bundles in the core are calculated using the conventional subchannel methodology. Pertinent closure relations are used to compute the hydraulic losses, momentum and energy exchange between adjacent subchannels, and heat transfer between the solid and fluid regions. The resulting model can perform both steady-state and transient computations across the entire core. This fully implicit model also includes an adaptive time stepping algorithm for automatic time step adjustment. A preliminary code-to-code comparison demonstrates good agreement between the present subchannel-based model and a computational fluid dynamics (CFD)-based model for a transient case in which the core inlet flow rate varies with time. Following the code-to-code comparison, the thermal hydraulic model is used to analyze the protected loss of heat sink (P-LOHS) accident scenario.

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氟盐冷却堆全堆芯瞬态热水力模型

摘要建立了固体引脚燃料氟盐冷却小型模块化先进高温反应堆(SmAHTR)的热工水力模型。这个概念前的SmAHTR是由橡树岭国家实验室(ORNL)开发的。在本研究的燃料组件构型中，燃料销和非燃料销呈六边形布局。熔融的FLiBe盐冷却剂平行于针排流动。建立了有限体积模型，用于计算堆芯固体区域(燃料和非燃料引脚以及石墨反射器)的温度。使用传统的子通道方法计算流经堆芯销束的冷却剂的温度、流量和压力分布。相关的闭合关系用于计算水力损失、相邻子通道之间的动量和能量交换以及固体和流体区域之间的传热。所得到的模型可以在整个核心上执行稳态和瞬态计算。该全隐式模型还包括一个自适应时间步进算法，用于自动时间步长调整。初步的代码对代码的比较表明，对于岩心进口流量随时间变化的瞬态情况，基于子通道的模型与基于计算流体动力学(CFD)的模型具有良好的一致性。在代码对比的基础上，采用热工模型对P-LOHS事故情景进行了分析。

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

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.