Influence of neutron irradiation on the microstructure of nuclear graphite

An X-ray diffraction study

Journal article (2017)

Authors

Z. Zhou RST/Neutron and Positron Methods in Materials - AS
W.G. Bouwman RST/Neutron and Positron Methods in Materials - AS
H. Schut RST/Neutron and Positron Methods in Materials - AS
T. O. van Staveren NRG (Nuclear Research and Consultancy Group) Petten
M. C R Heijna NRG (Nuclear Research and Consultancy Group) Petten
C. Pappas RST/Neutron and Positron Methods in Materials - AS
Research Group
RST/Neutron and Positron Methods in Materials (AS) (TU Delft)
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Published Date

15-04-2017

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Neutron and Positron Methods in Materials

Abstract

Neutron irradiation effects on the microstructure of nuclear graphite have been investigated by X-ray diffraction on virgin and low doses (∼1.3 and ∼2.2 dpa), high temperature (750° C) irradiated samples. The diffraction patterns were interpreted using a model, which takes into account the turbostratic disorder. Besides the lattice constants, the model introduces two distinct coherent lengths in the c-axis and the basal plane, that characterise the volumes from which X-rays are scattered coherently. The methodology used in this work allows to quantify the effect of irradiation damage on the microstructure of nuclear graphite seen by X-ray diffraction. The results show that the changes of the deduced structural parameters are in agreement with previous observations from electron microscopy, but not directly related to macroscopic changes.

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