Jellyfish would ‘inevitably’ force nuclear submarines into shutdown if fleet based in Brisbane, expert says
Australia’s nuclear-powered submarines would “inevitably” be forced into an emergency reactor shutdown by swarms of jellyfish if the fleet was based in Brisbane, a leading marine scientist says.
The Australian government this week released a shortlist of three sites – Brisbane, Newcastle and Wollongong – as a potential east-coast home port for the nuclear submarine fleet, which will arrive in about 2036 under the Aukus partnership with the US and the UK.
The Queensland government has been cagey when asked whether it supports a base in Brisbane, a position described as “very strange” by the federal defence minister, Peter Dutton, whose electorate is in Brisbane.
“There are many thousands of jobs that are associated with such a facility,” Dutton said last week.
“You’ve got to make judgments about whether there’s capacity within a particular port structure to accommodate that additional work.”
Jellyfish expert Lisa-ann Gershwin, a leading marine biologist, says Brisbane is “close to the absolute worst place” for a nuclear submarine base, due to the conditions in Moreton Bay and the frequent jellyfish blooms.
In 2006, the US nuclear-powered supercarrier USS Ronald Reagan was forced into an emergency reactor shutdown in Brisbane after it sucked more than 800kg of jellyfish into its condensers, hindering coolant from reaching the main reactors.
“Picture if you will America’s biggest, most expensive, most fearsome, awesome supercarrier is on its maiden voyage,” Gershwin said.
“It comes into the port of Brisbane and it sucks in thousands of jellyfish. It was a very embarrassing situation for the American navy. Luckily there was no major accident, nothing happened, nothing exploded.
“But when you’re dealing with nuclear anything, you’ve got to be [more cautious].”
The phenomenon of jellyfish shutdowns is surprisingly common in any power plant that sucks in water as a coolant.
Gershwin says any base for a submarine with an in-built nuclear reactor could not be enclosed like Moreton Bay, which is sheltered by Moreton Island and North Stradbroke Island.
“Jellyfish act like plastic,” Gershwin said.
“If you’ve ever seen a pool filter that’s got a plastic wrapper caught, it clogs up … and floods all over the place because it’s not going through the filter. The water gets stopped by this ‘plastic’ and then the water can’t pass by that. Emergency shutdowns of power plants happen all the time, very frequently.”
Gershwin said that if Brisbane was used to base nuclear submarines, a jellyfish shutdown would be “inevitable”.
“There aren’t many things as a scientist that I would say are inevitable, but this is. I couldn’t tell you what day or time it would happen, but I can tell you it would happen.
“You’ve got to be really careful about where you put these things. Anywhere that you’ve got warm water, you’re going to have jellyfish. Moreton Bay is just sucked in with jellyfish.”
Brisbane ranked eighth of the sites considered by Defence as a potential submarine base in 2011, with Sydney listed as the best choice.
Defence said nuclear-powered submarines would have systems in place “to prevent the disruption of functionality from foreign matter being sucked into cooling systems”.
“The commonwealth will write formally to the respective state governments to seek their engagement with feasibility activity, including formal community engagement,” a spokesperson said.