On Wed, 12 Aug 2009 06:04:50 -0700 (PDT), NT
wrote:

no, all nukes made since the early 80s use choke doors rather than
seals, and aren't sealed.

What is a choke door? Even wikipedia is silent on that subject.

If there's no seal, that would explain how the steam gets out, so I am
reassured, thank you very much.