各向异性对 TRISO 燃料性能的影响

IF 1.9 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY
Gyanender Singh , Jordan A. Evans , Wen Jiang , Jason Hales , Stephen Novascone
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引用次数: 0

摘要

三结构各向同性(TRISO)微粒的制造涉及使用流化床化学气相沉积(CVD)工艺沉积热解碳(PyC)和碳化硅(SiC)层。众所周知,化学气相沉积工艺可生成具有结晶纹理的多晶层,从而赋予多晶层各向异性的热物理性质。过去的研究表明,颗粒失效的风险随着各向异性的增加而增加。PyC 层的各向异性超过什么极限就会因失效风险而变得不可接受,这已被确定为一个高度优先的知识缺口。本研究首次系统研究了各向异性的热和机械特性对 TRISO 燃料性能的影响。这项计算研究使用燃料性能代码 BISON 进行,研究了弹性和热特性的各向异性如何影响 TRISO 粒子的应力、温度和失效。此外,还分析了工作温度和颗粒几何形状等其他因素对各向异性效应的影响。研究利用了最近发布的 TRISO PyC 和 SiC 层各向异性弹性和热行为模型,该模型使用具有完全各向异性能力的张量来实现。研究发现,具有各向异性的球形 TRISO 颗粒比具有各向同性的球形颗粒具有更大的最大拉伸应力和更高的失效概率。使用这些最新开发的模型预测的燃料性能与使用历史模型获得的性能相当。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of anisotropy on TRISO fuel performance
Manufacturing of tristructural isotropic (TRISO) particles involves the deposition of pyrolytic carbon (PyC) and silicon carbide (SiC) layers using the fluidized bed chemical vapor deposition (CVD) process. The CVD process is known to generate polycrystalline layers with crystallographic textures, which imparts anisotropic thermophysical properties to the layers. Past studies have shown the risk for particle failure increases with an increase in anisotropy. The limit beyond which the anisotropy of PyC layers becomes unacceptable due to failure risk has been identified as a high-priority knowledge gap. This work presents a first systematic study on the effects of anisotropic thermal and mechanical properties on TRISO fuel performance. This computational study, performed using the fuel performance code BISON, investigates how the anisotropy in elasticity and thermal properties affect the stresses, temperature, and failure of a TRISO particle. The influence of other factors, such as operating temperature and particle geometry on the anisotropy effects, also has been analyzed. The studies utilize the recently published anisotropic elasticity and thermal behavior models for TRISO PyC and SiC layers implemented using tensors with full anisotropic capability. The spherical TRISO particles with anisotropic properties were found to have greater maximum tensile stress and significantly higher failure probability than the spherical particles with isotropic properties. The fuel performance predicted using these recently developed models was found to be comparable with the performance obtained using the historical models.
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来源期刊
Nuclear Engineering and Design
Nuclear Engineering and Design 工程技术-核科学技术
CiteScore
3.40
自引率
11.80%
发文量
377
审稿时长
5 months
期刊介绍: Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.
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