14052215
Description
Flashcards by Miss C Rodgers, updated 12 months ago
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Created by Miss C Rodgers
almost 6 years ago
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| Question | Answer |
| Which atoms undergo nuclear fission? | Uranium or plutonium |
| When hit by a neutron, Uranium will undergo fission. Why ? | The uranium nucleus is unstable because there is a big difference in the number of protons and neutrons. |
| What are the fuel rods made of, in a nuclear reactor? | Uranium or plutonium |
| Uranium needs to be hit by what, before it can undergo fission? | A slow moving neutron |
| What SLOWS DOWN neutrons, | The graphite moderator |
| What is the function of the control rods? | They absorbs neutrons to slow down the reaction |
| What prevents a meltdown in a nuclear reactor? | The controls rods absorb the neutrons to slow down the reaction. If they need to stop the reaction completely, the control rods are placed, fully into the reactor. |
| What is the function of the coolant? | Coolant is circulated around a nuclear reactor to prevent the temperature of the reactor becoming too high |
| Why is there a concrete shield around a nuclear reactor? | To prevent radioactive waste escaping into the environment |
| What is an environmental advantage of using nuclear power? | No carbon dioxide is produced |
| What is an environmental disadvantage of using nuclear power? | It produces radioactive waste with a long half life. This means it has to be stored carefully. |
| What is produced by nuclear fission? | Heat energy, two new chemicals, 2 or 3 neutrons |
| Balance the equation above by inserting the number of neutrons released during this reaction | There are 2 neutrons |
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