How feasible is nuclear power for Australia?

Nuclear power is a credible source of abundant zero-emissions electricity, but it would take 20 years to commence operations from a standing start in Australia.

The battle lines have been drawn over Australia’s energy future. 

With the nation committed to net zero emissions by 2050, the Albanese Labor government is committed to renewables. The Coalition wants nuclear.

Opposition leader Peter Dutton’s vision for meeting Australia’s energy needs would include large-scale nuclear power plants and small modular reactors, a technology that is not yet proven, but which Coalition shadow Minister for Energy Ted O’Brien says could be “up and running within a 10-year period.”

While nuclear power might experience a resurgence globally and eventually have a role in Australia, right now, no matter how much intent there might be to activate a nuclear power industry, it is difficult to envision before the mid 2040s.  

The reality is there is no substitute for solar and wind power this decade and next, supported by batteries, transmission lines and peaking gas generation.

Any call to go direct from coal to nuclear is effectively a call to delay decarbonisation of our electricity system by 20 years.

Let’s unpack the pros and cons of nuclear power, the obstacles to getting it up and running in Australia by the mid 2040s, and the longer-term prospects.

The pros

From a purely engineering perspective, there is no better source of zero emissions electricity than nuclear power.  The reasons are many.

Compatibility. Nuclear power plants can dispatch electricity when requested and they are directly compatible with the 50 cycles per second alternating current (AC) electricity system.

In contrast, solar and wind power generators do not have inertia, do not have system strength, cannot dispatch when requested and do not provide synchronous AC power.  Nevertheless, these features can be integrated into the system through modern power electronics and battery energy storage systems.

The mining footprint of nuclear is small. There is no need for battery materials such as lithium, manganese, nickel or cobalt. Nor is there need for rare earth elements such as europium, terbium, neodymium and many others.

Nuclear uses modest amounts of copper, steel and concrete.

The footprint for uranium mining is small because only 1 tonne of uranium in a nuclear power station is needed to produce the same amount of electrical energy as approximately 100,000 tonnes of coal in a coal-fired power station. 

The real-estate footprint is small. Approximately three square km of land is needed for a 1 gigawatt (GW) nuclear generator, although there would always be an additional exclusion area surrounding the site.

In contrast, solar farms need about a square kilometre of land area for each 50 megawatts of generation capacity. Thus, a 3 GW solar farm producing  the same annual generated energy as a 1 GW nuclear plant would require about 60 square km.

Wind farms need almost 10 times more area than solar farms per megawatt, although  most of the land between the turbines can continue to be used for agriculture.

In principle, nuclear power plants can be located close to existing transmission lines or even at old coal-fired power stations.  In practice, this may not be possible because of surrounding populations, or the power stations being repurposed by their owners.

The safety record of nuclear power is excellent. That is despite high profile accidents such as Three Mile Island, Chernobyl and Fukushima.

The deaths from accidents and air pollution per unit of electrical energy generated are comparable with solar and wind power, in the extremely low end of the range at less than 0.05 deaths per terawatt-hour.  Hydroelectric power is the next lowest at 1.3 deaths per terawatt-hour. Coal has the highest rate, at 25 deaths per terawatt-hour.

The cons

There are challenges for nuclear power in Australia, most notably timetable and cost.

Legislation. Commonwealth legislation passed by the Howard government in 1998 prohibits nuclear power.  Australia is the only country in the G20 to have a legislated ban on nuclear power.  This would need to be lifted before anything else could happen.

Public support.  An August 2023 poll by the Resolve Political Monitor showed 40 percent backed nuclear power, 33 percent were undecided and 27 percent were opposed. It is likely that no matter how small the opposition, it will be vocal.

Ramp rate. Large nuclear power generators cannot ramp up and down rapidly like batteries or peaking gas generators. This reduces their compatibility with a predominantly solar and wind powered electricity grid. It is expected, though, that small modular reactors (SMRs) will be better in this respect than large, conventional reactors. 

Falling investment. The various operational, political and cost challenges faced by the nuclear industry have led to nuclear’s share of global electricity generation falling from more than 17 percent in 1996 to 9 percent in 2022.
Starting from scratch. It is unlikely that Australia would switch from being a laggard to a leader.  That is, we would not proceed before we saw a licensed SMR (not a prototype) operating in the US, Canada, UK or another OECD country.

After that, we would need to beef up the regulatory system, find the first site, find and license the first operator, approve and issue construction contracts, establish a waste-management system, establish the decommissioning rules and decommissioning fund, run the environmental and safety regulatory gamut, train a workforce, respond in the streets to the inevitable protests, and respond to the inevitable legal opposition all the way to the High Court.

Only then could construction begin.  It is difficult to imagine all this could be accomplished and deliver an operational nuclear reactor in Australia before the mid 2040s.

The cost of wind versus nuclear

Coal-fired generators and nuclear power generators can dispatch electricity at full power more than 90 percent of the year.   In practice, because demand fluctuates, the typical dispatch level from the Australian coal-fired fleet is about 60 percent.  

For comparison, what would be the capital cost of a wind farm firmed to dispatch 60 percent of the year?  A simplified approach would be to ignore market economics and the variability of solar electricity in the system, and assume a 30 percent capacity factor for the wind energy.  

With these assumptions, for a wind farm to dispatch 60 percent of the year we would need to install 2 GW of wind turbines.  The first 1 GW of turbines would dispatch when the wind is blowing.  The second 1 GW of turbines would be used to charge a 7 GW-hour (GWh) battery, to be discharged into the grid on demand.  

Using costings from the CSIRO GenCost draft 2023-2024 report, the cost in this simplified model would be around AUD$7 billion per GW.  Other, less costly, integration configurations are available.

In comparison, the latest cost estimate for the Hinkley Point C nuclear power plant under construction in the UK is about AUD$27 billion per GW.

The big opportunity in thinking small

Because of the enormous cost and construction delays of large-scale nuclear plants, in Australia we would be looking to use SMRs.  But we will want the reassurance of first seeing SMRs work safely and well in the UK, Europe, Canada, the US or another OECD country.

The trouble is, there are no SMRs operating in the UK, Europe, Canada, the US or any other OECD country.  Nor are any SMRs under construction or approved in an OECD country. 

There is no data to support any claims about how much SMRs will cost when deployed as operating power stations.  

Still, introducing nuclear power when we can, starting in the 2040s, would bring benefits.  Most importantly, nuclear power generation would reduce the ongoing mining footprint for the regular replacement of solar panels, wind turbines and batteries and the expanded electricity generation to support decarbonising our exports and population growth.

For these reasons, it would be worth removing the ban on nuclear power so that we can at least thoroughly investigate the options. 

Dr Alan Finkel , former Chief Scientist of Australia and author of Powering Up: Unleashing the Clean Energy Supply Chain is Chair of the ARC Centre of Excellence for Quantum Biotechnology at The University of Queensland. 

Originally published under Creative Commons by 360info™.

Editors Note: In the story “Nuclear future” sent at: 22/03/2024 16:30.

This is a corrected repeat.