it may be physically impossible but until we test them with catastrophic conditions we won’t know. that said, their long history of fail-safe fail states and the extremely reduced physical constraints (lower pressure, lower temps, lower amounts of fissile material, lower enrichment, etc.,) make me think you’re right, but it’s gonna be hard to prove because we’re having such difficulty getting the larger industry to test the shit much less deploy it in any reasonable amount of time.