| MELTDOWN | Accident in nuclear reactor (8) |
| COHERE | Stick helium in nuclear reactor (6) |
| MODERATOR | Substance used to slow down neutrons in nuclear reactor (9) |
| HEAVYWATER | Gorilla starts to threaten everyone during conflict - it is found in nuclear reactor |
| PLUMBAGO | Lubricant in nuclear reactors |
| URANIUM | This element, whose isotopes are used as fuel in nuclear reactors and nuclear weapons, was discovered by German chemist Martin Heinrich Klaproth in 1789. One pound of this material yields as much ener |
| MAGNOX | Alloy used in nuclear reactors |
| BORON | Chemical element used for shielding in nuclear reactors (5) |
| TRITIUM | Radioactive isotope of hydrogen produced in nuclear reactors by neutron activation of lithium-6; from Greek, 'third' (7) |
| THORIUM | Radioactive element used in nuclear reactors - trio hum (anag) (7) |
| ZIRCONIUM | Hard grey-white metal, Zr, used in nuclear reactors (9) |
| WATER | Radiator containing volatile wavy substance used in nuclear reactors (5,5) |
| HEAVY | Radiator containing volatile wavy substance used in nuclear reactors (5,5) |
| NEPTUNIUM | Radioactive metallic element of the actinide series produced by neutron bombardment of uranium in nuclear reactors (9) |
| SIZEWELL | Measure hole in nuclear site (8) |
| REACTORS | Which energy-generating machines are found in nuclear power stations? (8) |
| PLUTONIUM | Element whose isotopes are used as fuel in certain types of nuclear reactors and as an ingredient in nuclear weapons. It was first detected in 1941 by American chemists Glenn T. Seaborg, Joseph W. Ken |
| WBOSON | Discovered at CERN in 1983, a type of elementary particle involved in nuclear weak interaction, simi |
| EARS | Listening devices discovered in nuclear submarines (4) |
| IODINE | Cut aid for those in nuclear disaster (6) |
