Abstract The Transient Reactor Test (TREAT) Facility is a graphite reactor capable of delivering tailored power histories to unique experiment designs. Frequently, these experiments are designed to simulate a specific reactor transient to perform detailed studies of reactor fuel behavior. The reactor core is uniquely designed to allow a limited energy release and resulting peak fuel cladding temperature such that thermal feedback mechanisms shut the reactor power transient down in a passive manner, thus maximizing the lifetime of the reactor fuel cladding. The reactor is air cooled; however, the cooling system does not serve a safety function. The air cooling is typically used for four main functions: (1) accelerate cooling of the reactor core to ambient temperature post transient operations, (2) remove activated gases from the reactor cavity, (3) perform heat balance for power calibration, and (4) maintain criticality on extended steady-state runs or shaped transients. With the restart of the reactor, these systems are now fully operational and have been exercised during the past year for the first time in more than 20 years. This paper summarizes the thermal properties of the core and the thermal-hydraulic design of the TREAT Facility and presents selected results of temperature profiles resulting from operation. Conservatively estimated maximum transient energy and steady-state power is provided.

中文翻译：

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TREAT 设施的热设计

摘要 瞬态反应堆测试 (TREAT) 设施是一种石墨反应堆，能够为独特的实验设计提供定制的功率历程。通常，这些实验旨在模拟特定的反应堆瞬变，以对反应堆燃料行为进行详细研究。反应堆堆芯的独特设计允许有限的能量释放和由此产生的峰值燃料包壳温度，这样热反馈机制以被动方式关闭反应堆功率瞬变，从而最大限度地延长反应堆燃料包壳的寿命。反应器采用空气冷却；然而，冷却系统不提供安全功能。空气冷却通常用于四个主要功能：（1）在瞬态操作后加速反应堆堆芯冷却至环境温度，（2）从反应堆腔中去除活化气体，(3) 执行功率校准的热平衡，以及 (4) 保持对扩展稳态运行或整形瞬态的临界性。随着反应堆的重新启动，这些系统现已全面运行，并在过去一年中进行了 20 多年来的首次运行。本文总结了堆芯的热性能和 TREAT 设施的热工水力设计，并介绍了运行产生的温度曲线的选定结果。提供保守估计的最大瞬态能量和稳态功率。本文总结了堆芯的热性能和 TREAT 设施的热工水力设计，并介绍了运行产生的温度曲线的选定结果。提供保守估计的最大瞬态能量和稳态功率。本文总结了堆芯的热性能和 TREAT 设施的热工水力设计，并介绍了运行产生的温度曲线的选定结果。提供保守估计的最大瞬态能量和稳态功率。