- 放射性の（後出 radiation level は放射線レベル）
- （ここでは）核関連の（後出 nuclear isotope power source は放射性同位体の動力源、nuclear-powered (cruise) missile は原子力推進〈巡航〉ミサイル）
- state-controlled corporation
- pose a hazard
- ponder ～
5 dead in Russian radioactive rocket engine explosion
MOSCOW (AP) — Russia's nuclear agency says five of its employees were killed when a rocket engine exploded at a far-northern military base.
The explosion occurred at the navy's testing range near the village of Nyonoksa, about 1,000 kilometers north of Moscow, on Aug. 8.
The state-controlled Rosatom nuclear corporation said the explosion occurred while the engineers were testing a "nuclear isotope power source" for a rocket engine. Local authorities in nearby Severodvinsk, a city of 183,000, reported a brief spike in radiation levels after the explosion, but said it didn't pose any health hazards.
Rosatom's mention of a "nuclear isotope power source" led some Russian media to conclude it was the Burevestnik (Petrel), a nuclear-powered cruise missile first revealed by Russian President Vladimir Putin in March 2018.
The U.S. and Soviet Union pondered nuclear-powered missiles in the 1960s, but they abandoned those projects as too unstable and dangerous.