This is a closed-book, closed-note quiz. 10. The moderating ratio MR is defined by MR=ax Which of the following is nor a requirement for a good moderator? A. High mass number B. High neutron scattering eross-section C. Low neutron absorption cross-section D. High number concentration of moderator atoms 11. What is the criterion for a reactor to be critical? A. keff1 D. 0 12. What is a fast reactor? A. Fission reactor containing no moderator B. Fission reactor for which keff>1 C. Reactor lacking control rods D. Fusion reactor Identify the parts of the generic reactor shown above: 1. Blanket 2. Containment 3. Control rod 4. Core 5. Coolant 6. Reactor vessel 7. Reflector 8. Shield 9. Which part is found in breeder reactors but not thermal power reactors? This is a closed-book, closed-note quiz. 10. The moderating ratio MR is defined by MR=ax Which of the following is nor a requirement for a good moderator? A. High mass number B. High neutron scattering eross-section C. Low neutron absorption cross-section D. High number concentration of moderator atoms 11. What is the criterion for a reactor to be critical? A. keff1 D. 0 12. What is a fast reactor? A. Fission reactor containing no moderator B. Fission reactor for which keff>1 C. Reactor lacking control rods D. Fusion reactor Identify the parts of the generic reactor shown above: 1. Blanket 2. Containment 3. Control rod 4. Core 5. Coolant 6. Reactor vessel 7. Reflector 8. Shield 9. Which part is found in breeder reactors but not thermal power reactors