One of Ritchie's achievements was the declaration of Wellington as a nuclear weapon free zone in 1982. This declaration came at a time when a nuclear warship, the USS Truxton, was about to enter Wellington Harbour. Within one year, half of New Zealand was living in declared nuclear weapon free zones, and women were spurred on to increase their representation in local government. There was major political fallout too: Mayor Michael Fowler, aligned to the National Party, announced the day after the motion was passed that he would quit at the end of the term.
