10. An important aspect of the thermal-hydraulic design is concerned with conditions that might arise from an accident. >> 11. Provision must be made in the design to accommodate deviations from normal operati ng conditions, such as following partial or complete loss in the coolant flow.> 12. Three general mechanisms are distinguished whereby heat is transferred from one point to another, namely, conduction, convection and radiation UNIT 9 REACTOR MATERIALS 1. A unique aspect of reactor environment is the presence of intense nuclear radiations of vari Ous 0 2. Mechanical properties, such as tensile strength, ductility, impart strength and creep, must be adequate for the operation conditions. <OV></OVh 3. The material must be able of being fabricated or joined, e.g., by welding, into the required 4. An important requirement for structural and cladding materia ls is that they have a smal ads orption cross section for neutrons. <oOx/08 5. The alloys in common use as cladding material are zircaloy-2 and zircaloy-4, both of which have good mechanical properties and corrosion resistance. oOx/oe 6. Ordnary water is attractive as a moderator because of its low cost, its excellent slowing wn power. <ov></ov10. An important aspect of the thermal-hydraulic design is concerned with conditions that might arise from an accident.>> 11. Provision must be made in the design to accommodate deviations from normal operati ng conditions, such as following partial or complete loss in the coolant flow.>> 12.Three general mechanisms are distinguished whereby heat is transferred from one point to another, namely, conduction, convection and radiation. UNIT 9 REACTOR MATERIALS 1. A unique a spect of reactor environment is the presence of intense nuclear radiations of vari ous types.<O ></O > 2. Mechanical properties, such as tensile strength, ductility, impart strength and creep, must be adequate for the operation conditions.<O ></O > 3. The material must be able of being fabricated or joined, e.g., by welding, into the required shape.<O ></O > 4. An important requirement for structural and cladding materials is that th ey have a small ads orption cross section for neutrons.<O ></O > 5. The alloys in common use as cladding material are zircaloy-2 and zircaloy-4, both of which have good mechanical properties and corrosion resistance.<O ></O > 6. Ordinary water is attractive as a moderator because of its low cost, its excellent slowing-do wn power.<O ></O >