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Reflector  Materials - h1017v2_73
CONTROL MATERIALS

Material Science Volume 2 of 2
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CLADDING AND REFLECTORS DOE-HDBK-1017/2-93 Plant Materials Summary The important information in this chapter is summarized below. Cladding and Reflectors  Summary Major characteristics required for cladding material: Mechanical properties such as ductility, impact strength, tensile strength, creep, and ease of fabrication Physical   properties   include   high   corrosion   resistance   and   high   melting temperature High thermal conductivity Nuclear properties such as small absorption cross section Four materials suitable for cladding: Aluminum is used for low power, water-cooled research, training, and materials test reactors in which temperatures are below 100C. Magnesium is used for uranium metal fuel in carbon-dioxide cooled, graphite- moderated power reactors in United Kingdom. Zirconium is used for fuel-rod cladding in water-cooled power reactors. Beryllium is suitable for use as cladding but is not used as such due to its high cost and poor mechanical properties.  It is, however, used as a reflector in some test reactors. Reflectors are used to return neutrons leaving the reactor core back to the core. Essential requirements for reflectors include. Low macroscopic absorption cross section to minimize loss of neutrons High macroscopic scattering cross section High logarithmic energy decrement due to low mass number Temperature stability Radiation stability MS-05 Page 14 Rev. 0







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