Showing posts with label nuclear meltdown. Show all posts
Showing posts with label nuclear meltdown. Show all posts

Tuesday, April 5, 2011

Viewpoint: Fukushima makes case for renewable energy.... By Antony Froggatt




The Fukushima accident has highlighted one of the most important issues concerning nuclear power - that of safety and risk.
Fukushima reactor  
The risk of containment damage at Fukushima was put at one in a million, per reactor per year

The accepted wisdom has been that the consequences of a catastrophic nuclear accident may be large, but that the frequency is low.

The industry and nuclear regulators calculate this on the basis of the likelihood of an accident for any one operating year. In the case of the design of the first four reactors at Fukushima, the Japanese Nuclear Energy Safety Organization estimated in 2002:

"The frequency of occurrence of a core damage accident is 1/100,000 or less per one year for one reactor and the frequency of occurrence of an accident leading to containment damage is 1/1,000,000 or less per one year for one reactor."

"Whereas nuclear costs have tended to go up, renewables have gone down”

Given that only a few decades, rather than millennia separate the accidents at Fukushima, Chernobyl and Three Mile Island (which were also thought to be at minimal risk of core damage) it is clear that nuclear operators and/or regulators are significantly underestimating the inherent risks associated with nuclear technology.

The Cancun Summit in December 2010 agreed: "Climate change is one of the greatest challenges of our time and that all Parties share a vision for long-term co-operative action."

To meet UN targets, emissions must be cut by about 80% by 2050, which will require decarbonising the energy sector.

At the same time, traditional energy forecasts anticipate rapid increases in energy demand, driven primarily by the need to fuel the growing economies in Asia, particularly China and India. The International Energy Agency (IEA) assumes that global energy demand will increase by 47% by 2035.

Energy efficiency
Supporters of nuclear power believe that it should play an increasingly important role in this new, highly efficient, zero-emissions energy sector.

However, nuclear power is not currently a global technology, being employed by only 30 countries with just six - USA, France, Japan, Germany, Russia and South-Korea - producing almost three-quarters of the nuclear electricity in the world.
Olkiluoto  
 Finland's Olkiluoto nuclear plant is late, and 50% over budget

The total contribution to global commercial energy production is around 6%, compared to 25% for coal 23% for natural gas.

For nuclear power to play a significant role in meeting future energy demand a significant scaling up of its use will therefore be required, amplifying many-fold the existing problems of nuclear safety, siting and waste management, as well as causing new worries about the proliferation of nuclear materials.

Given the scale and urgency of the problem, it is essential that low-cost technologies with a proven track record of coming in on time and budget, and with global appeal, are prioritised.

The number one priority must therefore be energy efficiency, which not only addresses climate change and energy security problems simultaneously, but also brings demonstrable and rapid economic benefits.

"Renewables along with energy efficiency can deliver all or virtually all of our global energy needs”

The second area is renewable energy, which, to the surprise of many, has entered the mainstream in the last few years. For example in the EU, renewables installations provided the majority of new capacity in 2008 and 2009, while in Germany they are now bigger contributors to electricity than nuclear power.

This deployment at scale has demonstrated not only the technical capabilities and environmental advantages of wide-spread use of renewables, but also the economic benefits, with reduced dependencies on fluctuating fossil fuel prices.

Nuclear power on the other hand has, at best, had a chequered history of delivery. The most recent example in Europe is the infamous Olkiluoto reactor in Finland, whose original start-up date was May 2009 but which is now at least three-and-a-half years late, and more than 50% over budget.

So whereas nuclear costs have tended to go up, renewables have gone down, and in many conditions are now the cheaper option.

Cascading problems
As a result of Fukushima, most commentators believe that the engineering and financial costs associated with nuclear power will increase further.
Woman outside Fukushima evacuation centre  
Fukushima provided 3% of Japan's electricity

In particular it is expected that there will be a greater emphasis on protecting plants from broader environmental threats such as flooding, storms and droughts (which are expected to become more frequent as a result of climate change).

It is also likely that the cascade of problems at Fukushima, from one reactor to another, and from reactors to fuel storage pools, will also affect the design, layout and ultimately the cost of future nuclear plants.

Numerous studies have shown that renewables along with energy efficiency can deliver all or virtually all of our global energy needs, and that therefore nuclear power does not have to be part of the future.

Meanwhile, the ongoing disaster at Fukushima has highlighted the environmental, societal and economic impact that nuclear power can have in extreme conditions.

As Japan addresses the aftermath of the earthquake and tsunami, too much worry, time and effort are having to be spent trying to secure and make safe one facility that provided just 3% of the country's electricity.

Antony Froggatt is a Senior Research Fellow in the Energy, Environment and Resource Governance programme at Chatham House, in London.

Wednesday, March 23, 2011

The worst that could happen in Japan... By Tom Engelhardt


The worst that could happen in Japan

Tuesday, March 15, 2011

malaysiakini: Japan's nuclear morality tale... by Brahma Chellaney

Japan's nuclear morality tale
Brahma Chellaney
Mar 15, 2011, 11:33am
COMMENT The troubles at the Fukushima nuclear power plant and other reactors in northeast Japan have dealt a severe blow to the global nuclear industry, a powerful cartel of less than a dozen major state-owned or state-guided firms that have been trumpeting a nuclear power renaissance.

NONEBut the risks that seaside reactors like Fukushima face from natural disasters are well known.

Indeed, they became evident six years ago, when the Indian Ocean tsunami in December 2004 inundated India's second-largest nuclear complex, shutting down the Madras power station.

Many nuclear power plants are located along coastlines because they are highly water-intensive. Yet natural disasters like storms, hurricanes and tsunamis are becoming more common, owing to climate change, which will also cause a rise in ocean levels, making seaside reactors even more vulnerable.

For example, many nuclear power plants located along the British coast are just a few metres above sea level. In 1992, Hurricane Andrew caused significant damage at the Turkey Point nuclear-power plant on Biscayne Bay, Florida, but, fortunately, not to any critical systems.

All energy generators, including coal- and gas-fired plants, make major demands on water resources.
But nuclear power requires even more. Light-water reactors (LWRs) like those at Fukushima, which use water as a primary coolant, produce most of the world's nuclear power.

The huge quantities of local water that LWRs consume for their operations become hot water outflows, which are pumped back into rivers, lakes and oceans.

azlanBecause reactors located inland put serious strain on local freshwater resources, including greater damage to plant life and fish, water-stressed countries that are not landlocked try to find suitable seashore sites.

But, whether located inland or on a coast, nuclear power is vulnerable to the likely effects of climate change.

As global warming brings about a rise in average temperatures and ocean levels, inland reactors will increasingly contribute to, and be affected by, water shortages.

During the record-breaking 2003 heat wave in France, operations at 17 commercial nuclear reactors had to be scaled back or stopped because of rapidly rising temperatures in rivers and lake. Spain's reactor at Santa Mara de Garoa was shut for a week in July 2006 after high temperatures were recorded in the Ebro River.

Paradoxically, then, the very conditions that made it impossible for the nuclear industry to deliver full power in Europe in 2003 and 2006 created peak demand for electricity, owing to the increased use of air-conditioning.

Indeed, during the 2003 heat wave, Electricite de France (EDF), which operates 58 reactors - the majority on ecologically sensitive rivers like the Loire - was compelled to buy power from neighbouring countries on the European spot market. The state-owned EDF, which normally exports power, ended up paying 10 times the price of domestic power.

Similarly, although the 2006 European heat wave was less intense, water and heat problems forced Germany, Spain and France to take some nuclear power plants offline and reduce operations at others.

Central dilemma


Highlighting the vulnerability of nuclear power to environmental change or extreme weather patterns, in 2006 plant operators in western Europe also secured exemptions from regulations that would have prevented them from discharging overheated water into natural ecosystems, affecting fisheries.

France likes to showcase its nuclear power industry, which supplies 78 percent of the country's electricity. But such is the nuclear industry's water intensity that EDF withdraws up to 19 billion cubic metres of water per year from rivers and lakes, or roughly half of France's total freshwater consumption.

Freshwater scarcity is a growing international challenge, and the vast majority of countries are in no position to approve of such highly water-intensive inland-based energy systems.

Nuclear plants located by the sea do not face similar problems in hot conditions, because ocean waters do not heat up anywhere near as rapidly as rivers or lakes. And because they rely on seawater, they cause no freshwater scarcity. But, as Japan's reactors have shown, coastal nuclear power plants confront more serious dangers.

When the Indian Ocean tsunami struck, the Madras reactor's core could be kept in safe shutdown condition because the electrical systems had been ingeniously installed on higher ground than the plant itself.
And, unlikjapan nuclear fukushima no 3 reactor explosion imagee Fukushima (left), which bore a direct impact, Madras was far away from the epicentre of the earthquake that unleashed the tsunami.

The central dilemma of nuclear power in an increasingly water-stressed world is that it is a water guzzler, yet vulnerable to water.

And, decades after Lewis L Strauss, the chaiperson of the US Atomic Energy Agency, claimed that nuclear power would become “too cheap to meter”, the nuclear industry everywhere still subsists on munificent government subsidies.

While the appeal of nuclear power has declined considerably in the West, it has grown among the so-called nuclear newcomers, which brings with it new challenges, including concerns about proliferation of nuclear weapons.

Moreover, with nearly two-fifths of the world's population living within 100km of a coastline, finding suitable seaside sites for initiation or expansion of a nuclear power programme is no longer easy.

Fukushima is likely to stunt the appeal of nuclear power in a way similar to the accident at the Three Mile Island plant in Pennsylvania in 1979, not to mention the far more severe meltdown of the Chernobyl reactor in 1986.

If the fallout from those incidents is a reliable guide, however, nuclear power advocates will eventually be back.


BRAHMA CHELLANEY is Professor of Strategic Studies at the Centre for Policy Research in New Delhi and the author of, among others, 'Asian Juggernaut: The Rise of China, India, and Japan' (Harper Paperbacks, 2010) and 'Water: Asia's New Battlefield' (Georgetown University Press, 2011).