What is a significant limitation of nuclear energy?

What is a significant limitation of nuclear energy?

• A. Radioactive waste remains hazardous for thousands of years.
• B. It produces high CO2 emissions during operation.
• C. It relies on fossil fuels for cooling water.
• D. It has low energy density.

Answer: (A)

Long-lived radioactive waste is the major limitation of nuclear energy because spent fuel remains hazardous for thousands of years. This requires secure, permanent waste management with robust containment, isolation from people and the environment, ongoing monitoring, and careful transportation and storage. The timescale and complexity of safely managing this material impose enduring costs, regulatory hurdles, and public acceptance challenges—factors that persist long after plants are built or retired. Other choices don’t capture the dominant challenge. Nuclear power produces very low CO2 emissions during operation, and lifecycle emissions are still generally much lower than those of fossil fuels, so CO2 is not the defining issue. Cooling water is a practical concern for plant operation, but it’s a technical and environmental consideration rather than the fundamental barrier. Nuclear energy also has high energy density, meaning it can produce large amounts of power from small fuel amounts, so energy density is not a limitation.

Long-lived radioactive waste is the major limitation of nuclear energy because spent fuel remains hazardous for thousands of years. This requires secure, permanent waste management with robust containment, isolation from people and the environment, ongoing monitoring, and careful transportation and storage. The timescale and complexity of safely managing this material impose enduring costs, regulatory hurdles, and public acceptance challenges—factors that persist long after plants are built or retired.

Other choices don’t capture the dominant challenge. Nuclear power produces very low CO2 emissions during operation, and lifecycle emissions are still generally much lower than those of fossil fuels, so CO2 is not the defining issue. Cooling water is a practical concern for plant operation, but it’s a technical and environmental consideration rather than the fundamental barrier. Nuclear energy also has high energy density, meaning it can produce large amounts of power from small fuel amounts, so energy density is not a limitation.