[justa-hairyape]

Hydrogen explosions don’t indicate containment breach.

Neat trick. You equate meltdown to containment breach. TMI was a partial meltdown. Where are the two headed cows in Penn ?

[BenKenobi]

Neither does it indicate meltdown.

All hydrogen explosions indicate is that the core is hot enough to disassociate water. This is strictly a function of temperature.