Quote from atticus:
The pressure loss alludes to a containment breach of some kind. I was a Westinghouse Prize finalist for a "portable" fission-weapon design in HS, but it's certainly not the same animal, I readily admit. This would be the first breach of a Mk I containment system.
Perhaps you would explain it to us what you mean by "broken"?
I didn't use the correct wording, there has been some contamination but it's my understanding the fuel rods and reactor vessel are still intact. I don't pretend to be a specialist but I do try to educate myself instead of being ignorant like our panicking thread author.