HC Deb 26 July 1984 vol 64 c751W
Mr. Roger King

asked the Secretary of State for Defence what is the estimated hull life of a Royal Navy nuclear attack submarine.

Mr. Lee

Royal Navy SSN's are planned to have an operational life of between 25 and 30 years. They are withdrawn from service when maintenance costs become too high, or their military effectiveness becomes too limited as a result of advances in technology.