What is the main purpose of using protective coatings on some reactor components?

• A. To increase thermal conductivity
• B. To improve corrosion resistance, reduce wear, and limit hydrogen uptake
• C. To inhibit radiation
• D. To improve magnetic properties

Answer: (B)

Protective coatings on reactor components are used to keep the metal surface safe from the harsh reactor environment by acting as a barrier that reduces chemical attack, minimizes wear, and limits how much hydrogen can enter the metal. In nuclear systems, corrosion can eat away at surfaces exposed to coolants, wear can remove protective layers and create sites for failure, and hydrogen uptake can lead to embrittlement and cracking. A coating slows or prevents these processes, extending component life and maintaining integrity.

This is why the best choice emphasizes improving corrosion resistance, reducing wear, and limiting hydrogen uptake. Other goals like increasing thermal conductivity are not the primary purpose of these coatings, and inhibiting radiation or improving magnetic properties are not the main objectives of protective coatings in this context.