| HYMAN | Rickover known as the Father of the Nuclear Navy |
| EARN | Bring home bacon in nuclear navy |
| FALLOUT | Disagree as to the consequence of the nuclear explosion |
| ENRICOFERMI | Italian physicist (1901-54) who was one of the chief architects of the nuclear age: 2 wds. |
| STRIDENT | A small weapon, in the past, is now part of the nuclear deterrent (8) |
| HEAVYWATER | Serious drink ___ that's part of the nuclear process (5,5) |
| BILLGATES | Co-founder of the nuclear-energy company TerraPower |
| HERCULEAN | Tail of the nuclear explosion was very powerful (9) |
| ARM | Equip with some of the nuclear missiles (3) |
| SQUANDER | Team includes number taking final bits of the nuclear waste |
| NUCLEUS | Separated from the rest of the cell by the nuclear membrane, this structure controls and regulates the activities of the cell. |
| TINTIN | The father of the modern European comic book, Belgian Georges Remi, better known as Herge, created 23 volumes of the adventures of this boy detective and his dog, Snowy |
| CHURCHWEDDING | Could be the means to a marriage of convenience for those joining union in the presence of the Father of the Chapel (6,7) |
| JACOB | In the Old Testament, the son of Isaac who was the father of the 12 patriarchs of Israel (5) |
| CHARLES | Given name of the polymath considered the father of the computer who invented the difference engine and worked with Ada Lovelace on the later analytical engine (7) |
| OBAMA | 71 years after the nuclear bombing of Hiroshima, who was the first sitting US president to visit the city? (6,5) |
| BARACK | 71 years after the nuclear bombing of Hiroshima, who was the first sitting US president to visit the city? (6,5) |
| MEANEY | Who played the father of the family in The Commitments, The Snapper and The Van? (6) |
| BABBAGE | Considered the "father of the computer", inventor of the difference engine who worked with Ada Lovelace on the later analytical engine (7) |
| OPPENHEIMER | J. Robert ---, US nuclear physicist known as the 'father of the atomic bomb' (11) |
