It’s not Australian construction, it would seem to to be a Western country issue, or one potentially affecting any nuclear construction.
See Flamanville 3 ( https://www.world-nuclear.org/information-library/country-profiles/countries-a-f/france.aspx Under “new nuclear capacity”). It was started in 2007, and was estimated to be completed in 2012, but it’s still not completed. It’s currently scheduled to begin operating in 2024.
Oma powerplant in Japan was started in 2010, and is currently scheduled to be completed in 2026. https://en.m.wikipedia.org/wiki/Ōma_Nuclear_Power_Plant
South Korea’s new Hanul reactors look like they’ve taken about 10 years each. https://en.m.wikipedia.org/wiki/Hanul_Nuclear_Power_Plant (The table in section “Reactors” might be interesting, as it shows the pre-2000 reactors taking only about 5 years to complete)
