Which of the following statements is true regarding a fission product barrier?

• A. Containment Structure is a barrier
• B. Fuel Cladding is not a barrier
• C. System Piping is not a barrier
• D. N-16 is not a barrier

Answer: (A)

The main idea here is that a fission product barrier is a layer that prevents radioactive fission products from escaping to the environment. The containment structure serves this role as the outermost, engineered barrier. It encloses the reactor and its coolant system, is designed to withstand pressure and temperature, and provides leakage control so that, even in unlikely accident scenarios, fission products are kept inside the plant.

While fuel cladding does act as a barrier by keeping most fission products contained within the fuel itself, and the piping system forms part of the plant’s boundaries, the statement focusing on containment as the barrier highlights the barrier that prevents release to the environment in the broad, protective sense. N-16 is a radioactive product produced in the coolant, not a barrier itself, so describing it as a barrier misstates its role.