"MOSCOW - Radiation levels in the Russian city of Severodvinsk rose by up to 16 times on Aug. 8 after an accident that authorities said involved a rocket test on a sea platform, Russia’s state weather agency said on Tuesday, the TASS news agency reported.

The defense ministry initially said background radiation had remained normal after the incident on Thursday, but city authorities in Severodvinsk in northern Russia said there had been a brief spike in radiation levels.

Greenpeace has said radiation levels rose by 20 times."

Andrey Kuzmin and Tom Balmforth report for Reuters August 13, 2019. [2]

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"Russian Nuclear-Powered Cruise Missile Blows Up, Creating “Mini-Chernobyl”" (Ars Technica) [3]

"Russian Nuclear Engineers Buried After 'Skyfall Nuclear' Blast" (Aljazeera) [4]