“SSN-637 Sturgeon class”. FAS. 2021年4月17日閲覧。 “After a 5-year study was completed on the SSN-637 class submarine, the design life was extended from 20 years to 30 years, with a possible extension to 33 years on a case-by-case basis. However, many boats of this class were retired prior to this limit in order to avoid expensive reactor refueling operations.”。
