Pick up the wrong statement?

A. Fast neutrons have energies above 1000 eV

B. Slow or thermal neutrons have energy of the order or 0.025 eV

C. Fast reactor uses moderator

D. Most serious drawback in using water as coolant in nuclear plants is its high vapour pressure

E. In a heterogeneous or solid-fuel reactor, the fuel is mixed in a regular pattern within moderator.

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