Question

Pick out the unmatched pair from the following:
(A) Moderator - Heavy water
(B) Nuclear fuel - 92U235
(C) Pressurized water reactor - water as the heat exchange system
(D) Safety rods - Carbon​

Answer 1

Answer:

B nuclear fuel-92u325

Answer 2

Safety rods-Carbon is the unmatched pair. (Option D)

• Safety rods perform the starting up and shut down of a reactor.
• Safety rods can terminate a chain reaction under any condition as they contain absorbers.
• They remain available in case a loading error requires their action.
• Safety rods are inserted and withdrawn when the reactor is ready to operate after the fuel is fully loaded.
• Safety rods have an automatic feature called a fuse which releases them by physical effects and is independent of electronic signals.