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Unformatted text preview: 10/21/2011 1 Chapter 7: The Fires of Nuclear Fission Nuclear Fission (continued) Oct. 24/2011 Review from Last Lecture • Balancing nuclear equations • What is critical mass? • Mass number/isotopic mass/atomic weight • Matter disappearing? 2 Nuclear Energy Reactors • Heat generation (energy formation) takes place in reactor core – U ‐ 235 has 0.7% abundance; fuel here is enriched to 3 ‐ 4% (to sustain reaction in fuel rods ) to 3 4% (to sustain reaction, in fuel rods ) – Movable control rods, made of substances that absorb neutrons are used to help control the chain reaction 3 Suppose an earthquake occurred near a nuclear power plant. How should the reactor core (fuel and control rods) be programmed? 1. The control rods should be withdrawn to slow fission process in reactor core 2 The control rods should be fully inserted to slow 4 2. The control rods should be fully inserted to slow fission process in reactor core 3. The control rods should be withdrawn to speed up fission process 4. The control rods should be fully inserted to speed up fission process 10/21/2011 2 Which is not a characteristic of both nuclear and coal ‐ fired power plants? 1. Steam is used to drive a turbine 2. Cooling water is required 5 3. The fuel is combusted 4. Mechanical energy is converted into electrical energy Three Mile Island, 1979...
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This document was uploaded on 10/25/2011 for the course CHEM 111 at Miami University.
- Fall '11