Abstract
Two- and three-dimensional pore evolutions along with nitrogen diffusion behavior in nuclear graphite were studied using thermogravimetric analysis, X-ray computed tomography, scanning electron microscopy, and the Brunauer-Emmett-Teller method. Calculated nitrogen diffusion activation energy was approximately 2.5 kJ·mol−1. Stable weight loss of graphite specimens increased with temperature, primarily due to more escaped nitrogen from the graphite matrix. Fewer nano-pores and more micro-pores were formed because of the nano-pore coalescence. At 873 K (600 °C), graphite microstructure evolution might be induced by temperature and mild oxidation. Before being placed into high temperature gas-cooled reactors (HTGRs), porous nuclear graphite should be subjected to vacuum at 573 K to 673 K (300 °C to 400 °C) to minimize 14N in the pores and 14C generated during operation of HTGRs.
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