The four-factor formula kinf is defined for what type of reactor?

The four-factor formula kinf is defined for what type of reactor?

• A. Infinite reactor, because it neglects leakage
• B. Finite reactor, because it accounts for leakage
• C. Boiling water reactor, because of its coolant
• D. Heavy water reactor, due to moderation

Answer: (A)

Kinfinite multiplication factor describes neutron reproduction in an endless, leakage-free medium. The four-factor formula expresses kinf as η f p ε, which assumes no neutrons leak out of the system, so it reflects the intrinsic reproduction per generation in an infinite lattice. In a real, finite reactor, neutrons can escape, reducing the actual multiplication to keff, which is kinf adjusted for leakage. The other options describe reactor features or types, but kinf is defined for the infinite, leakage-free case, not for a specific reactor design or for a finite system.

Kinfinite multiplication factor describes neutron reproduction in an endless, leakage-free medium. The four-factor formula expresses kinf as η f p ε, which assumes no neutrons leak out of the system, so it reflects the intrinsic reproduction per generation in an infinite lattice. In a real, finite reactor, neutrons can escape, reducing the actual multiplication to keff, which is kinf adjusted for leakage. The other options describe reactor features or types, but kinf is defined for the infinite, leakage-free case, not for a specific reactor design or for a finite system.