Abstract The thermal behavior of reactor channels is of prime concern for a postulated scenario of LOCA along with the un-availability of ECCS as the integrity of the fuel bundle may be challenged and slumping of fuel pins is expected. The present study is aimed to analyze the thermal characteristics of a large capacity Indian PHWR specific fuel bundle with disassembled fuel pins configuration. The configuration considers the collapse of 37-fuel pins of a bundle from the endplate and rearranges at the bottom surface of the PT. The paper further investigates the influence of PT-CT contact on the channel. The results show that a significant circumferential temperature gradient is developed in the PT due to the slumping of fuel pins. The maximum temperature is obtained at the bottom sector of the PT, which is in contact with the fuel pin. However, PT-CT contact causes a sudden temperature drop at the bottom nodes of the PT.

中文翻译：

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印度PHWR在坍落燃料细棒条件下通道加热行为的实验模拟

摘要 反应堆通道的热行为是假设的 LOCA 情景以及 ECCS 不可用的主要关注点，因为燃料束的完整性可能受到挑战，并且预计燃料棒会坍塌。本研究旨在分析具有拆​​卸燃料棒结构的大容量印度 PHWR 特定燃料束的热特性。该配置考虑了来自端板的束的 37 根燃料棒的坍塌，并在 PT 的底面重新排列。论文进一步研究了PT-CT接触对通道的影响。结果表明，由于燃料棒的坍塌，在 PT 中产生了显着的周向温度梯度。在与燃料棒接触的 PT 底部部分获得最高温度。然而，