The 107th GRAU arsenal was often used to store various munitions, including 122-mm rockets for the Grad MLRS and 82-mm mortar shells - OSINT researcher Tatarigami.
Its difficult for me to even get a grasp of scale. I really have no actual concept for what I'm looking at, above some kind of minimum threshold for what must be several buildings at least.
Just do a quick search for "mushroom cloud", and you'll find that all this combined is nowhere near what a nuke would look like.
The mushroom cloud formed from a small nuke like little boy (small by modern standards) reaches up to about 8 km. that's close to cruising altitude for an airliner. The reason the cloud from a nuke "mushrooms" in a different way than conventional munitions is that the intense heat is causing enough hot air to rise to form a literal cloud when it reaches high enough that the humidity condenses. This can even cause radiative rain shortly after the bomb has gone off.
The fireball of Little Boy is estimated to have been almost 400 m in diameter with a surface temperature approximately equal to that of the sun, and every building within about 1.6 km was instantly completely destroyed.
It is difficult to comprehend just how much more powerful even a small "tactical" nuke is than any conventional weapon. There's a reason soldiers that were shown blast tests of them during the Cold War have told stories of breaking down crying at the sight, because they just couldn't fathom what they were seeing.
I was talking about the tactical nuke that might have been stored there. By the way, the locals in Toropets said that the explosion would be much bigger if another storage facility was hit. Perhaps they were talking about some deep storage with a nuke that remained intact. And this is probably the reason why the Ruscists now strictly forbid any publication of the aftermath.
The explosion of the nuke in the storage is very different from the explosion of the intentionally exploded armed nuke. It may not even explode at all, but only spread radioactive material.
But in this case, the radioactivity level did not increase, so evidently no nuke was hit.