It's not on the guideline page of explosions, because we have never done it and only accounted for the Inverse Square Law distance thingy. Our durability system is inherently flawed as durability in real life isn't linear, and also ridiculously, ridiculously oversimplified, which is why we don't do surface area, piercing, hardness/softness and all that fun stuff, it would be wack to cherrypick which feats we decide to when more knowledgeable calc group members than me in the past have stated that it would require to literally start the wiki from scratch. So unless we're deciding a massive systematic revision I find it problematic to only apply certain standards to feats when they are too high and not apply so when it's "eh, reasonable".
If a feat is ridiculously inflated compared to other feats in the verse due to area (for example the Superman Apokolips feat, or Captain America tanking explosions in comics) we should simply disregard the feat as being an outlier.
From Assaltwaffle in one of the older threads:
An equal amount of energy put onto a significantly smaller surface area is going to deal more damage than if it's against a larger surface area. 3,000 joules spread across your body is going to hurt, but it's not going to kill you. 3,000 joules imparted from a .308 round will detonate your skull like a watermelon.
So energy yields being treated as universal is definitely an issue. It's a massive and systemtic issue. One so large that you pretty much have to understand that our system of VS matches is just for fun and should never be taken seriously. Someone who is 7-C for tanking an explosion of that magnitude is not actually that strong. Even at point blank, unless your body is curled ontop of whatever the explosive device is, you're going to eat less than 10% of that energy at absolute maximum. On the other hand, if you're 7-C from tanking a punch that has that energy, you've eaten almost the entire energy yield of that punch over a smaller surface area. So not only did one tank 10% of the energy yield, one tanked it over a surface area of about 1.7m^2, while the other tanked it over a surface area of a couple square centimeters.
The divide I just described to you gives durability difference of up to 100,000x or more, depending on the context and exact numbers, yet we treat them as equals. But we overlook that because we literally have to without uprooting the entirety of the system.