Gallais L, Burla R, Martin F, Richaud J C, Volle G, Pontillon M, Capdevila H, Pontillon Y
Aix Marseille University, CNRS, Centrale Marseille, Institute Fresnel, Marseille, France.
CEA, DEN/CAD/DEC/SSA3C, Laboratoire d'Analyse de la Migration des Radioelements, 13108 Saint-Paul-lez-Durance, France.
Rev Sci Instrum. 2018 Jan;89(1):013110. doi: 10.1063/1.4996611.
We report on experimental development and qualification of a system developed to detect and quantify the deformations of the cladding surface of nuclear fuel pellet assemblies submitted to heat transient conditions. The system consists of an optical instrument, based on 2 wavelengths speckle interferometry, associated with an induction furnace and a model pellet assembly used to simulate the radial thermal gradient experienced by fuel pellets in pressurized water reactors. We describe the concept, implementation, and first results obtained with this system. We particularly demonstrate that the optical system is able to provide real time measurements of the cladding surface shape during the heat transients from ambient to high temperatures (up to a cladding surface temperature of 600 °C) with micrometric resolution.
我们报告了一个系统的实验开发与鉴定情况，该系统旨在检测和量化处于热瞬态条件下的核燃料芯块组件包壳表面的变形。该系统由一台基于双波长散斑干涉测量法的光学仪器组成，与感应炉及一个用于模拟压水反应堆中燃料芯块所经历的径向热梯度的模型芯块组件相关联。我们描述了该系统的概念、实施情况以及首次获得的结果。我们特别证明，该光学系统能够在从环境温度到高温（包壳表面温度高达600°C）的热瞬态过程中，以微米级分辨率实时测量包壳表面形状。
