Identify the three fission product barriers:

• A. Fuel Cladding
• B. System Piping
• C. Containment Structure
• D. Reactor Vessel

Answer: (A)

In nuclear safety, fission products are kept behind multiple barriers arranged in sequence. The first line of defense is the fuel cladding—the thin metal shell that surrounds the fuel pellets. This cladding is the immediate barrier between the radioactive fission products inside the fuel and the reactor coolant. If the cladding remains intact, most fission products stay contained within the fuel and do not enter the coolant.

The other two barriers in the typical three-barrier concept are the boundary of the primary coolant system (which includes the reactor vessel and its piping) and the containment structure that surrounds the reactor and the coolant system. Together they provide additional layers of protection to prevent any release of radioactive material to the environment if the cladding is breached.