Nuclear Power - AP Environmental Science

1. What is nuclear waste?

   Radioactive materials left over from nuclear reactions. Remains hazardous for thousands of years.

2. What is the purpose of a containment structure in a nuclear plant?

   To prevent the release of radioactive materials. Thick concrete barrier around reactor core.

3. What is the role of a turbine in a nuclear power plant?

   To convert steam energy into mechanical energy. Steam pressure spins blades to generate electricity.

4. What does the term 'half-life' refer to?

   The time taken for half of a radioactive substance to decay. Fundamental measure of radioactive decay rate.

5. Which process occurs in the sun's core?

   Nuclear fusion. Hydrogen nuclei combine to form helium.

6. What is a meltdown in the context of nuclear power?

   A severe overheating of the reactor core. Loss of cooling leads to fuel damage.

7. What is the unit of radioactivity?

   Becquerel (Bq). Measures nuclear disintegrations per second.

8. What is a breeder reactor?

   A reactor that generates more fissile material than it consumes. Converts non-fissile U-238 into fissile Pu-239.

9. What is the primary component of nuclear fuel rods?

   Uranium dioxide (UO₂). Ceramic pellets stacked in metal tubes.

10. Which isotope of uranium is fissile?

    Uranium-235. Can sustain a chain reaction unlike U-238.

11. What is the role of control rods in a nuclear reactor?

    To absorb neutrons and regulate the fission reaction. Inserted or withdrawn to control reaction rate.

12. Which gas is used as a coolant in some nuclear reactors?

    Carbon dioxide or helium. Non-reactive gases avoid corrosion issues.

13. What type of radiation is emitted during nuclear decay?

    Alpha, beta, or gamma radiation. Different types have varying penetration abilities.

14. What is a pressurized water reactor (PWR)?

    A reactor where water is kept under pressure to prevent boiling. Most common reactor type worldwide.

15. Identify one advantage of nuclear power.

    Low greenhouse gas emissions during operation. No CO₂ emissions during electricity generation.

16. What does 'enriched uranium' mean?

    Uranium with increased U-235 concentration. Higher U-235 content enables sustained reactions.

17. What is the role of a moderator in a nuclear reactor?

    To slow down neutrons to sustain the chain reaction. Fast neutrons must be slowed for efficient fission.

18. What is nuclear fission?

    The splitting of an atomic nucleus into smaller parts. Releases enormous energy when heavy nuclei break apart.

19. Identify one disadvantage of nuclear power.

    Potential risk of nuclear accidents. Catastrophic failures can release radiation over wide areas.

20. Which element is commonly used as a moderator in reactors?

    Graphite or heavy water. These materials slow neutrons effectively.

21. What is the function of a coolant in a nuclear reactor?

    To remove heat from the reactor core. Prevents core overheating and meltdown.

22. What is the function of a steam generator in a nuclear plant?

    To convert water into steam using reactor heat. Drives turbines to generate electricity.

23. What is nuclear fusion?

    The process of combining two nuclei to form a heavier nucleus. Powers the sun and releases massive energy from light nuclei.

24. What is the function of the secondary loop in a PWR?

    To transfer heat from the primary loop to produce steam. Isolates radioactive primary coolant from turbines.

25. Identify a byproduct of nuclear fission.

    Radioactive isotopes. Fission fragments are highly radioactive.

26. What is the typical lifespan of a nuclear reactor?

    30 to 40 years. Design life determined by neutron radiation damage.

27. Identify one environmental impact of nuclear power.

    Thermal pollution from reactor cooling systems. Hot water discharge affects aquatic ecosystems.

28. What is plutonium-239 used for in nuclear reactors?

    As a fissile material for nuclear fuel. Artificial isotope created from U-238 in reactors.

29. Identify a method for managing nuclear waste.

    Deep geological storage. Isolates waste from environment for millennia.

30. Identify a challenge of decommissioning nuclear power plants.

    Safe disposal of radioactive materials. Contaminated materials require careful handling.

31. What is the purpose of a nuclear reactor's pressure vessel?

    To contain the reactor core and coolant under high pressure. Prevents radioactive material release during operation.

32. State the formula for energy released in nuclear reactions.

    $E = mc^2$. Einstein's equation shows mass converts to energy.

33. What is a chain reaction in nuclear physics?

    A self-sustaining sequence of fission reactions. Each fission triggers more fissions in a continuous cycle.

34. What is a boiling water reactor (BWR)?

    A reactor where water boils directly in the reactor core. Simpler design with direct steam generation.

35. What is a thermal neutron?

    A neutron slowed to thermal equilibrium with its surroundings. Low-energy neutrons more likely to cause fission.

36. What is the primary fuel used in nuclear reactors?

    Uranium-235. This isotope readily splits when hit by neutrons.

37. What is the primary purpose of a nuclear power plant?

    To generate electricity. Heat from fission drives steam turbines.

38. Identify one safety feature of a nuclear power plant.

    Emergency core cooling system. Multiple backup systems prevent accidents.

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