“The detonation was low order conventional explosives not a nuclear explosion.”
You are correct. The conventional explosive was part of the inner components of the nuke and went off low order, out of sequence, and therefore no risk of a nuclear detonation.
A Titan II missle leaked rocket fuel in Arkansas and blew a warhead a quarter of a mile without any incident. 1970’s era.
Silos were in a pretty rural area but that still caused a scare. I believe all our current arms use solid fuel.
Much cheaper and safer.
The old Titans were fitted with some solid boosters and used to launch satellites I think.
The book 15 Minutes has a chapter on this event. I highly recommend reading this book. Netflix also has Trinity and Beyond, a documentary of all 335 above ground nuke tests. We played with matches in a dynamite storage room.