| Nuclear energy producer | 23 |
| Nuclear energy source | 21 |
| Nuclear event | 13 |
| Nuclear event, in headlines | 27 |
| Nuclear experiment | 18 |
| Nuclear experiments | 19 |
| Nuclear experiments, for short | 30 |
| Nuclear explosion | 17 |
| Nuclear explosion aftermath | 27 |
| Nuclear explosion result, maybe | 31 |
| Nuclear fam member | 18 |
| Nuclear family member | 21 |
| Nuclear family? | 15 |
| Nuclear fission co-discoverer Otto | 34 |
| Nuclear fission discoverer | 26 |
| Nuclear fission discoverer Otto | 31 |
| Nuclear fission Nobelist Otto | 29 |
| Nuclear fission target | 22 |
| Nuclear force elements | 22 |
| Nuclear fuel holders | 20 |
| Nuclear giants | 14 |
| Nuclear group | 13 |
| Nuclear group set up in 1957 | 28 |
| Nuclear liquid | 14 |
| Nuclear measure | 15 |
| Nuclear meltdown in a recent film | 33 |
| Nuclear missile | 15 |
| Nuclear missile, briefly | 24 |
| Nuclear Niels | 13 |
| Nuclear Nobelist | 16 |
| Nuclear Nobelist Niels | 22 |
| Nuclear or spinal actions | 25 |
| Nuclear org. | 12 |
| Nuclear org. created under HST | 30 |
| Nuclear pact | 12 |
| Nuclear particle | 16 |
| Nuclear particles | 17 |
| Nuclear physicist Enrico | 24 |
| Nuclear physicist Hans who won the 1967 Nobel Prize | 51 |
| Nuclear physicist Meitner | 25 |
| Nuclear physicist Niels | 23 |
| Nuclear physicist Szilard | 25 |
| Nuclear physicist's sign-off? | 33 |
| Nuclear physics | 15 |
| Nuclear physics prefix | 22 |
| Nuclear pioneer Enrico | 22 |
| Nuclear plant | 13 |
| Nuclear plant employee of note | 30 |
| Nuclear plant feature | 21 |
| Nuclear plant sight | 19 |
| Nuclear plant structure | 23 |
| Nuclear plant units | 19 |
| Nuclear power | 13 |
| Nuclear power acronym | 21 |
| Nuclear power agency until 1975 (abbr.) | 39 |
| Nuclear power apparatus | 23 |
| Nuclear power plant measures | 28 |
| Nuclear power plants | 20 |
| Nuclear power resource | 22 |
| Nuclear power since 1998: Abbr. | 31 |
| Nuclear proliferation | 21 |
| Nuclear radiation weapon, for short | 35 |
| Nuclear reaction starter? | 25 |
| Nuclear reactor | 15 |
| Nuclear reactor component | 25 |
| Nuclear reactor fluid | 21 |
| Nuclear reactor fuel | 20 |
| Nuclear reactor need | 20 |
| Nuclear reactor needs | 21 |
| Nuclear reactor part | 20 |
| Nuclear reactor parts | 21 |
| Nuclear reactor tube | 20 |
| Nuclear reactors | 16 |
| Nuclear reading: Abbr. | 22 |
| Nuclear regulatory grp. 1946-74 | 31 |
| Nuclear restraint pact | 22 |
| Nuclear splitting in the cosmos? | 32 |
| Nuclear sub weapon | 18 |
| Nuclear submarine | 17 |
| Nuclear test unit | 17 |
| Nuclear theorist Niels | 22 |
| Nuclear threat | 14 |
| Nuclear Threat Initiative co-chairman Sam | 41 |
| Nuclear treaty | 14 |
| Nuclear treaty result | 21 |
| Nuclear treaty subject | 22 |
| Nuclear treaty subjects | 23 |
| Nuclear trial | 13 |
| Nuclear trial prohibition | 25 |
| Nuclear trial, for short | 24 |
| Nuclear trials | 14 |
| Nuclear tryouts | 15 |
| Nuclear unit | 12 |
| Nuclear vessel, for short | 25 |
| Nuclear weapon | 14 |
| Nuclear weapon (Abbr.) | 22 |
| Nuclear weapon delivery device, for short | 41 |
| Nuclear weapon, in old headlines | 32 |
| Nuclear weapons | 15 |
| Nuclear weapons-testing dept. | 29 |