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首页> 外文期刊>Annals of nuclear energy >Physical characteristics of a PWR core loaded with micro-cell UO_2 pellet fuels
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Physical characteristics of a PWR core loaded with micro-cell UO_2 pellet fuels

机译：装有微电池UO_2颗粒燃料的压水堆堆芯的物理特性

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In this work, the physical characteristics of PWR cores are evaluated for several micro-cell UO2 pellets with Cr-coated Zircaloy-4 cladding through consistent fuel assembly (FA) and core-level analyses. The micro-cell UO2 pellets that are currently researched as accident tolerant fuel (ATF) candidates in the Korea Atomic Energy Research Institute (KAERI) are UO2-Cr, UO2-Mo, and UO2-SiO2-TiO2. In particular, a calculational matrix is used to consider not only the micro-cell UO2 pellets and the cladding coating, but also to estimate the achievable cycles within the usual 5.0 wt% uranium enrichment limit and the uranium enrichment required to achieve a reference cycle length of 480 effective full power days (EFPDs). The core analyses using the 3D nodal diffusion code MASTER showed that the cores loaded with micro-cell UO2 pellets (i.e., UO2-Cr and UO2-Mo) with Cr-alloy coating on Zircaloy-4 cladding have considerably shorter cycle lengths, lower discharge burnups, and more negative fuel temperature coefficients than the conventional UO2 fuel. The more negative fuel temperature coefficients lead to a more rapid stabilization under rod ejection accident with a substantially lower fuel temperature. In particular, the Mo-based micro-cell UO2 fueled cores have a much shorter cycle length and more negative moderator temperature coefficient than Cr-based one due to the large thermal and resonance capture cross sections of Mo isotopes and due to its lower critical boron concentration (CBC). However, the effect of Cr-alloy coating on core performance is not significant in comparison with the effects of the micro-cell UO2 pellets. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在这项工作中，通过一致的燃料组装（FA）和堆芯水平分析，对几种带有Cr涂层Zircaloy-4包层的微孔UO2颗粒评估了PWR堆芯的物理特性。目前在韩国原子能研究院（KAERI）中作为耐事故燃料（ATF）候选物进行研究的微孔UO2颗粒是UO2-Cr，UO2-Mo和UO2-SiO2-TiO2。特别是，计算矩阵不仅用于考虑微孔UO2球团和覆层涂层，而且还用于评估通常的5.0 wt％铀浓缩极限内的可达到的循环以及达到参考循环长度所需的铀浓缩480有效满功率日（EFPD）。使用3D节点扩散码MASTER进行的岩心分析表明，在Zircaloy-4覆层上装有Cr合金涂层的微孔UO2球团（即UO2-Cr和UO2-Mo）的球芯具有相当短的循环长度，较低的放电燃耗和比常规UO2燃料更大的负燃料温度系数。燃料温度系数越负，则在燃料喷射杆事故少的情况下，在燃料温度显着降低的情况下，可以更快地实现稳定。特别是，由于Mo同位素的热和共振俘获截面较大，并且由于其较低的临界硼，因此Mo基的以微孔UO2燃料为燃料的芯比Cr基的芯具有短得多的循环长度和负的慢化温度系数。浓度（CBC）。但是，与微孔UO2颗粒的影响相比，铬合金涂层对核心性能的影响并不显着。 （C）2018 Elsevier Ltd.保留所有权利。

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