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A powerful explosion occured in the Russian city of Izhevsk, at the Votkinsk Machine Building Plant, which produces ballistic missiles.
(streamable.com)
https://t.me/noel_reports/8107
https://t.me/operativnoZSU/135460
An explosion occurred near Izhevsk “during testing of rocket engines,” TASS reports, citing emergency services.
The explosion occurred in the area of the Votkinsk plant test site in the village of Yagul, 12 km from Izhevsk.
The Ministry of Emergency Situations, commenting on what happened, announced “technical work” at the Votkinsk Machine-Building Plant.
https://nuclearsecrecy.com/nukemap/
The largest strategic nuclear weapon ever built, a 50 megaton weapon, would produce a fireball slightly over 5 km.
I think that it is extremely safe to say that whatever fireball the factory had wasn't 10 km in diameter.
N.B. : the Halifax explosion was about 0.003 megaton (2.9 kilotons of TNT)
That'll be damage from the blast, rather than the fireball. Can't see blast damage in the video, so I assume that you're talking about the fireball.
Didn't the radius of damage have a fitting name?
I don't know, sorry.