Abstract

The commonly used materials for neutron moderators and reflectors are light water (H2O), heavy water (D2O), graphite (C), zirconium hydride (ZrHx), and beryllium (Be). When utilizing such materials in nuclear reactors, fundamental properties such as thermal and mechanical properties should be understood. This chapter has provided an overview of the fundamental properties of beryllium and zirconium hydride required for neutron reflectors. The outline of zirconium hydride has described the influence of temperature and hydrogen concentration on the basic properties of the hydride.

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