TL;DR: The temperature dependence of graphite IG-11, used in the HTR-10, was investigated by thermogravimetric analysis in the temperature range of 400-1200°C.
TL;DR: In this article, the ion-beam irradiation was used as an effective way for creating defects that could be similar to those created by neutrons in the nuclear reactor, and the discrimination of the defect types using the combination of the ID/IG and FWHM(G), two structural disorder indicators evolving differently according to the type and the concentration of the introduced defects into the carbon network.
TL;DR: In this paper, the porosity of the filler particles in the virgin graphite grades of the Next Generation Nuclear Plant (NGNPP) program was analyzed using optical microscopy.
TL;DR: In this paper, a review of the most important graphite properties which change with exposure to irradiation, namely dimens, dimens and degrades, is presented. But the graphite core components are not considered in this paper.
Abstract: Since the start of the ‘nuclear age’ graphite has been employed as a moderator in around 100 nuclear reactors, and today there are still some 30 graphite-moderated reactors operating and there are plans for new Generation IV high-temperature reactors. Many of the graphite moderator reactors now producing power are operating beyond their original design life. Therefore in some cases, to aid the reactor operators and designers, the existing graphite irradiation databases need to be extended either to a higher temperature or higher neutron fluence. Furthermore, data are needed for the different grades of graphite that are available at present. This can either be achieved by expensive, time consuming irradiation programmes or by improving the understanding of the mechanisms and processes which lead to irradiation-induced dimensional and property changes in the graphite core components. This review looks at three of the most important graphite properties which change with exposure to irradiation, namely dimens...
TL;DR: In this article, micro cracks with varied length and width are observed in nuclear grade graphite and highly oriented pyrolytic graphite (HOPG) by transmission electron microscopy.