NAR-30974 was the spacedock where the USS Enterprise-B was launched from in 2293. (Star Trek Generations)
Interior of the spacedock's station
Appendices
Background information
This model was first seen in Star Trek: The Motion Picture as the spacedock the USS Enterprise was launched from. It was heavily modified and labeled with the registry of NAR-30974 for Generations.[1]
This appears to be the same type of drydock that the USS Voyager was launched from at Utopia Planitia Fleet Yards in the episode "Relativity".