No decision has yet been made on what technology the new reactors will use.

Therefore it is impossible to build a fast reactor using only natural uranium fuel.

These reactors use natural uranium, rather than the enriched form, which is difficult and costly to make.

Integral fast reactors can use almost all the rest.

The reactor uses a total of four control rods.

A large reactor may use several coils to deliver the heat transfer fluid.

Some reactors do not use moderators to slow the neutrons.

Nuclear reactors use nuclear reactions to make heat and electricity.

These reactors use uranium-238, which is more common than the uranium-235 required by conventional reactors.

Both reactors use Delaware Bay as a source of cooling water.