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Jon Excell
Editor
The Engineer
Power generation is a 'risky' business
The radiation leaks triggered by the earthquake in Japan in 2011 prompted an understandable - if not always rational - debate on the safety of nuclear energy. The Engineer was quick to point out that ‘Fukushima’ shouldn’t - and probably wouldn’t - trigger a nuclear rethink. But it seems that we underestimated the impact of the disaster on the public relationship with atomic power, and the extent to which politicians would be prepared to back the technology.
One year on and the industry’s worst fears are being realised. Two weeks ago, Japan shut down its last active reactor. In Europe, Germany and Switzerland are phasing out the power source, while in France the industry is anxiously considering president Hollande’s pledge to reduce the country’s dependence on nuclear energy.
“Nuclear has to be a major component of any credible low carbon energy mix”
Wherever you stand - and we stick by our argument that nuclear has to be a major component of any credible low-carbon energy mix - there’s no denying the world’s appetite for it is diminished. However, no energy source is entirely without risk. And if the world does turn away from nuclear, these risks will only become more pronounced, whether it’s the financial risk of subsidising the renewables sector; the risk to the climate of relying too heavily on fossil fuels; or the environmental tightrope we tread - illustrated by the 2010 Deepwater Horizon disaster - when we try to exploit untapped deep-sea oil and gas reserves.
As always, engineers have a major role to play in mitigating these risks. Recently, we looked at how new approaches to manufacturing could help the cost-effective production of offshore wind turbines. In our latest in-depth feature, we look at how advanced blowout prevention technology could help prevent a repeat of the Deepwater Horizon spill.
It’s a reassuring development. Although as one of the contributors to our careers feature, BP’s Simon Drysdale, points out, oil and gas exploration is a frontier-busting pursuit, with perhaps more in common with space engineering than anything else. Indeed, one of BP’s top safety experts is a recent recruit from NASA.
It’s an important reminder that the technology that sustains our largely comfortable lives frequently pushes at the limits of what is possible. And if we want to sustain this existence, then surely we must accept an element of risk.
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Readers' comments (23)
Paul Reeves | 16 May 2012 6:02 pm
Brian (and to a certain extent John) firstly why is population always talked in terms of humans being consumers or resources - and not producers (both materially and intellectually) of resources and ideas which can solve problems and identify and process new (often unthought of) resources. Uranium only became a 'resource' during the last century being just one example.
If people used just a fraction of their febrile imagination, which only sees armaggedon, and use it to see how problems have been solved in the past though human ingenuity - and will no doubt be solved in the future - then ridiculous terms and ideas such the 'rape' of the planet - the planet isn't static and it's getting more and more 'artificial'- get over it- might get shown up as the pointlessly unhelpful and emotive ideas they are.
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Brian m | 16 May 2012 6:19 pm
John- Hope I'm wrong, but the current evidence would contradict that - just look at the increase in our UK population over the last 40 years - how affluent does a country have to be?
In nature populations tend to increase until some other factor limits the population, usually with a population crash.
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Philip Baker | 16 May 2012 7:16 pm
NIL power generation - is even more risky.
I have written many times in favour of nuclear power generation, based on the UK experience between 65 and today. I have ignored the ill informed, hysterical and politically driven media which is dominated by over represented minorities.
The essential need to provide bulk power, under the control of a UK generator, is essential to our society’s long term economic well being.
The longer we delay, the greater the risk of, system collapse.
We either build on the exemplary record of the past UK nuclear generation, (as operated by our National Grid), or we push men back into coal mines, or contend with unreliable power availability, (small at first, catastrophic later) by reliance of wind, wave and solar power, or reduce power consumption by making it unaffordable by using gas and oil.
That regrettable term “No brainer” comes to mind.
It’s obvious to any informed engineer, that we really have only one sensible choice, the one a better informed public in the 50's and 60's supported, before we had mindless 24 hr media and witless politicians.
We must have significant nuclear generation, and wait with growing concern as Europe is driven to war, over the supplies of gas and oil over which it has no control.
That’s the risk in further delay.
Lets us not stand by and let minorities shout down the UK majority.
Its time to make a very noisy stand, and say YES to Nuclear Power.
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Alan | 17 May 2012 9:34 am
Re CG's mysterious comment. (Thank you editor for asking him to clarify). It does waste time when people don't write clearly. The figure of 98% doesn't make sense as 24% of electricity is from hydro and about 10% from nuclear. Fossil fuels are the bulk of the balance. (SSAM- primary fuels include fuels burnt in engines, here we are discussing electrciity generation).
To help the discussion along CG could you be more specific? Please spell out your question!
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CG | 17 May 2012 11:14 am
Editor,
You are making the same mistake as most people do when asked this question, you are thinking of energy systems that are tapped into to generate electricity, I am talking about the way it is generated.
But anonymous is on the right track. The very simple question , that has worn him or her out, is do you think the electromagnetic induction will hold very very high portion of electricity generation that it has now, in 100 years time? Please give reason for your answer.
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Adrian C. | 17 May 2012 4:04 pm
I don't have the solution to the whole problem, but as far as domestic use is concerned it is in the government's hands that every new build should have its southerly facing roof covered with PV collectors. As the demand increases the cost of the installations wills fall whereby other old homes can be 'encouraged' to switch.
If every suitable roof in the country was covered, would we need as many FF or nuclear plants? Excess electricity could be fed back into the grid and supplement commercial usage. All it needs is someone to start the ball rolling. Before we end up living in a forest of uneconomic and useless wind turbines.
As an aside the same applies to water conservation. Unless the government starts dictating that new build have rainwater harvesting systems, the public will be slow to adopt them
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P Field | 17 May 2012 4:23 pm
The danger is the sheer cost of renewables and the fact we always get the hard sell in articles, never the hard facts. There are enough prototype schemes now that have been running for some time. The country needs to know actual average energy outputs and realistic costs. Without these hard facts The Engineer is right to point out the grave financial risks to the country.
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DOUGLAS BEAZER | 18 May 2012 9:20 am
I, for one, have always had my concerns about nuclear energy for two main reasons. Firstly about what we do with the waste, particularly in the long term rather than simply dumping it for future generations to deal with and secondly the security aspect particularly as terrorist organisations are becoming much more sophisticated in their activities.
We are an island nation surrounded by tidal waters which present us with a wonderful opportunity to capture, at very little cost, its energy. This can be done by turbines placed in the tidal flows acting both ways; one turbine placed in the incoming tidal flow and another turbine placed in the outgoing tidal flow with both of these two turbines being mounted on the same pylon. This would not blot the landscape or seascape because the only sign of the turbines would be the tops of the pylons above the water line which will enable the turbines to be raised for servicing and repair or replacement. This type of turbine technology already exists and would not require any great change to adapt it for water power generation.
We also are blessed with the ultra violet (UV) light from the sun, which again we do not appear to be keen to harness. The sun shines producing UV light every day, even through the clouds, free of charge and therefore with on-going technology we could surely develop our UV energy sector much more.
Wind energy, either on land or sea can only generate power when the wind blows between certain parameters, therefore sometimes no energy is produced, yet the Government stills seems intent on this form of power generation.
I am very suspicious of this and fear that there is a hidden agenda that they want these RENEWABLE energies to fail so that we have to turn to nuclear. This, of course, has inherent problems and dangers of security, development and decommissioning (largely an unknown technology- except for burying it in the ground).
I hope we can persuade the Government to put more resources, both financial and physical, into water and solar power as a true renewable. This would give our future generations chance to live in a much reduced carbon climate and a safer world.
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CG | 18 May 2012 10:30 am
I will start with the redox reaction.
Oxidation reduction (redox) is a chemical reaction, and combustion is a chemical reaction. Methane, with its four hydrogen bond, is a very good combustible and it gives off plenty of heat. Gas fired power stations use this heat to force water through a phase change to steam. The steam is driven over turbine blades, and on the same shaft are magnets (electrical or permanent). The turbine spins, the magnets spin over copper wires and electromagnetic induction produces electricity.
Fuel cells use a redox reaction in their use, and methane can be used to power certain types of fuel cell. The difference between the two uses of methane in a redox reaction, is that in combustion the reactants are mixed together, so the electrons make a short, mad rush to form new bonds after oxidation has broken old ones. This creates heat and no electricity - directly. Fuel cells keep the reactants apart, and forces the electrons to travel down a copper wire to make their new bonds, and only when electric power is drawn. This creates electricity and very little heat.
You can now buy types of fuel cells of one megawatt, the sieze of early utility siezed wind turbines - and look how big they are now. If these fuel cells could be powered by natural gas, they could be placed in shopping malls, or anywhere in urban areas. They make little noise, their transmission lines would be short, and the heat generated by them could be used for CHP. But their use would depend on the capacity of our gas grid.
That's enough food for thought for you on fuel cells, a good site to keep up with developments on fuel cells is: www.fuelcelltoday.com
Next comes nuclear power.
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CG | 18 May 2012 11:07 am
Nuclear power is another reaction that creates a lot of heat, but it's not a chemical reaction, like redox is. The heat is used the same way as all other forms of thermal power stations, and it will produce electromagnetic induction in the end. But I do wonder if, like the fuel cell, there is an alternative to just using the heat of fission. Many charged particles, which we live in mortal fear of, are created in this reaction. But charged particles, whether electron travelling down a copper wire or protons crossing a thylakoid membrane, can be a boon as well as a danger. Alpha radiation is just helium without its electrons, and all we need is something that wants to give up electrons, then we have an electric current, the product an inert gas. Beta radiation is highly speed electrons, could they not be used some how? I know there is beta votaics, but that's about all I do know. I am not a physicist, and I guess they would have looked at these things if they were possible. But you never can tell, once they had what they wanted, a bomb, or heat to boil up water for all that other stuff, perhaps they stopped looking. One thing's for sure, even when we get the wonderful fusion reactor, it will only be another giant kettle to heat up water, for electromagnetic induction - so don't expect the price of electricity to drop.
Next the fusion reactor we have always had, the sun, and PV.
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