Per my diagram you have at least three penetrations into the RC: Steam going out, condensate coming back in, and electrical. AT some point you may want to change the air in there for what ever reason so there's four penetrations.
edit: Your pictures of the "USS Devilfish" there, there is no USS Devilfish SSN 666. SSN 666 was the Hawkbill, a Sturgeon still but curious that it's renamed in the picture.