The Nuclear Power Station
Split the atom and harness the energy. How nuclear fission drives a chain reaction, how a reactor is controlled and turned into electricity, and how fission differs from the fusion that powers the Sun.
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Energy from the atom ⚛️
Deep inside a **nuclear power station**, the nucleus of an atom is split apart, releasing a huge amount of energy from a tiny amount of fuel. This module covers **nuclear fission** and the **chain reaction**, how a reactor is **controlled** and turns that energy into **electricity**, and how fission differs from **nuclear fusion**, the process that powers the Sun.
The words you need 🔑
Five ideas run through nuclear power:
What is nuclear fission? 💥
What happens during nuclear fission in a reactor?
- A large nucleus absorbs a neutron and splits into smaller nuclei, releasing energy
- Two small nuclei join together to form a larger nucleus
- The fuel burns in oxygen like coal or gas
- Electrons are stripped from atoms to make a current
From fission to electricity 🪜
An interactive activity.
Keeping it under control 🎛️
Each fission releases **more neutrons**, which can split more nuclei: a **chain reaction**. Left alone it would run away, so a reactor controls it in two ways. The **moderator** (often water or graphite) **slows the neutrons** down so they are absorbed and keep the reaction going. **Control rods** (often boron) **absorb neutrons**: push them in to slow the reaction, pull them out to speed it up.
Match each reactor part to its job 🔗
- Fuel rods
- Moderator
- Control rods
- Turbine
- Hold the uranium where fission takes place
- Slow the neutrons so fission continues
- Absorb neutrons to control the reaction
- Is spun by steam to drive the generator
Which describe fission? ✅
Select the TWO statements that describe nuclear FISSION.
- It splits a large nucleus into smaller ones
- It can set off a chain reaction
- It joins two small nuclei together
- It is the process that powers the Sun
Fission versus fusion ⚖️
Both release energy from the nucleus, but they are opposites.
How long must waste be stored? ⏳
An interactive activity.
Complete the reactor 🧱
In a reactor, a slow _____ is absorbed by a large nucleus, which undergoes _____ and splits, releasing energy. The _____ slows the neutrons so the reaction continues, while the _____ absorb neutrons to control it. The heat produces steam that spins a _____.
Where does fusion happen? ☀️
Nuclear fusion powers the Sun. Why is it so hard to reproduce on Earth?
- It needs extremely high temperature and pressure to force nuclei together
- There are not enough neutrons available on Earth
- The hydrogen fuel is too rare to find
- It is banned by international law
Run the reactor 🔀
An interactive activity.
Explain the difference ✍️
An interactive activity.
The grade-9 habit 🏆
Top answers keep **fission and fusion** crisp and separate: fission **splits a large nucleus** and can run a **chain reaction**; fusion **joins small nuclei** and needs **extreme temperature and pressure**. Never mix them up. And for **half-life**, just **halve** the quantity once for every half-life that passes, or read it straight off a **decay curve**. Split versus join, halve per half-life - top band.