The major problem in harnessing nuclear energy is how to :

Options

A. split nuclei
B. sustain the reaction
C. dispose of spent fuel safely
D. covert nuclear energy into electrical energy

Explanation

To solve the question regarding the major problem in harnessing nuclear energy, we can break down the problem into several steps:

### Step 1: Understand the Context of Nuclear Energy
Nuclear energy is generated through processes such as nuclear fission, where the nuclei of atoms are split to release energy. While this process can produce a significant amount of energy, it also comes with challenges.

**Hint:** Consider the different stages involved in nuclear energy production and what issues might arise at each stage.

### Step 2: Identify the Key Challenges
The challenges in harnessing nuclear energy include:
- Splitting nuclei (nuclear fission)
- Sustaining the nuclear reaction
- Converting nuclear energy into electrical energy
- Disposing of spent nuclear fuel safely

**Hint:** Think about which of these challenges poses the most significant risk to the environment and human safety.

### Step 3: Analyze the Risks Associated with Nuclear Energy
Among the challenges listed, the disposal of spent nuclear fuel is critical. Spent fuel is highly radioactive and can pose serious environmental and health risks if not handled properly. Past nuclear accidents, such as Chernobyl and Fukushima, highlight the dangers associated with improper waste management.

**Hint:** Reflect on historical nuclear accidents and their consequences to understand the importance of waste disposal.

### Step 4: Conclude the Major Problem
Based on the analysis, the major problem in harnessing nuclear energy is indeed how to dispose of spent fuel safely. This is crucial to prevent environmental contamination and protect living beings.

**Hint:** Consider the long-term implications of nuclear waste and why it is a pressing issue in the context of sustainable energy.

### Final Answer
The major problem in harnessing nuclear energy is how to dispose of spent fuel safely.