France sets out long-term nuclear recycling plans

Minister for the Economy, Finance, Industrial and Digital Sovereignty Bruno Le Maire announced the decision to continue with France's treatment-recycling strategy for used nuclear fuel beyond 2040, with plans to extend the life of existing recycling plants and to launch studies for a new MOX fuel fabrication plant and a new used fuel processing plant.

Lescure (second from left) and Le Maire (centre) pictured with La Hague Site Director Stéphanie Gaiffe (far left) and Orano CEO Nicolas Maes (on the right) during the visit (Image: Orano)

The announcement was made during a visit by Le Maire and Minister Delegate for Industry and Energy Roland Lescure to Orano's La Hague recycling site, days after France's Nuclear Policy Council (Conseil de Politique Nucléaire) said on 26 February that the country would continue with its closed nuclear fuel cycle strategy.

Le Maire announced three measures that will be taken towards this goal: a sustainability/resilience programme extending the life of the La Hague and Melox recycling plants beyond 2040; the launch of studies for a new MOX fuel fabrication plant at the La Hague site; and the launch of studies for a new used fuel processing plant, also at La Hague, by 2045-2050.

"A new page in French nuclear history is about to open. The time for large-scale national projects has returned and the nuclear energy sector has a central role to play," Le Maire said during his visit to La Hague.

In a post on X, Le Maire said the visit to La Hague by the two ministers sends a strong signal. "Thanks to this strategy, we will ultimately reduce the volume of nuclear waste by 75%," he said. "Our message is clear: nuclear power occupies a central place in the decarbonisation of our economy, the strengthening of our energy sovereignty and the reindustrialisation of our country."

Orano CEO Nicolas Maes said the announcements provide for major investments for the La Hague site. "Processing-recycling is one of the French industry's centres of excellence, representing know-how that has been mastered for some 50 years in our plants and of which all the group's employees can be proud," he said.

From the very beginning of its nuclear programme France has chosen to pursue a closed fuel cycle, reprocessing used nuclear fuel to recover uranium and plutonium for re-use. Reprocessing and recycling fuel in this way also significantly reduces the activity and volume of radioactive waste material requiring final disposal.

In the French model, the reusable materials which make up some 96% of used fuel are separated at La Hague. The plutonium recovered from this processing is reused in MOX (mixed-oxide) fuels manufactured by Orano at the Melox plant. Some 10% of nuclear electricity in France today is generated by recycling materials in the form of MOX fuel, Orano said, and this can rise to 25% and to almost 40% if used MOX fuel is further recycled.

Only the plutonium recovered from processed fuel is currently used in MOX. Reprocessed uranium - or RepU - can be re-enriched for use as fuel in existing light-water reactors. Four of France's reactors - at the Cruas-Meysse plant in Auvergne-Rhône-Alpes - are certified to use such uranium. In February, Cruas 2 became the first of those units to operate with a full core of fuel made from recycled uranium.Researched and written by World Nuclear News. France sets out long-term nuclear recycling plans : Waste & Recycling - World Nuclear News

Read More........→May 20, 2024

Emperor penguins face a bleak future – but some colonies will do better than others in diverse sea-ice conditions

Sara Labrousse/French Polar Institute, CC BY-SA Sara Labrousse, Sorbonne Université and Michelle LaRue, University of Canterbury

The long-term future looks bleak for Emperor penguins, but our new research shows some birds may be able to survive in certain conditions, depending on where they live, at least for the next few decades.

Over the past two years, Antarctic sea ice has declined dramatically, prompting scientists to suggest it could reach a “new state”.

A study based on satellite images shows that sea ice broke out early in Antarctica’s Bellingshausen Sea in 2022, potentially resulting in breeding failures across several Emperor penguin colonies in that region.

Our research shows Emperors form colonies in surprisingly diverse environmental conditions that vary depending on location around the continent. Within each of these regions, there is little difference between where birds make their homes and other sites, suggesting they could shift if they had to. This provides a ray of hope in an otherwise bleak outlook.

Emperor penguins may be the only birds to rarely set foot on land. They are unique among penguin species in that they breed on sea ice during the harsh Antarctic winter.

Male Emperor penguins incubate eggs and raise the chicks on sea ice during the Antarctic winter. Sara Labrousse/French Polar Institute, CC BY-SA

We know that they need “fast ice” – the coastal sea ice attached to the Antarctic continent or ice shelves. But they actually inhabit a range of fast-ice locations that differ in the timing of ice formation, how much ice forms and breaks, and even how close they get to other penguin species.

Depending on where they are along the Antarctic coast, Emperors make use of the habitat available to them. Their behaviour may be flexible enough to allow some colonies to cope better in a warming world.

Why fast ice is important

Emperor penguins rely on fast ice as a stable platform for their breeding season. Female Emperors lay their eggs and the males incubate them for about two and a half months.

Even though Antarctica’s sea ice is diminishing, this refers to a measure known as “sea ice extent”, which includes all sea ice covering the polar ocean, whether it is fast ice or drifting pack ice.

A decrease in sea ice extent is not necessary linearly linked to a drop in the area covered by fast ice (although the reverse is true).

If fast ice were to disappear, we would expect more than 90% of Emperor colonies to become functionally extinct by the end of the century. However, our study suggests that in the short to medium term, we should consider the differences in the penguins’ breeding habitats when we think about ways to protect them.

Emperors are unlikely to move far

By looking a little closer at different fast-ice habitats, we found Emperor penguins have certain preferences. The persistence of the ice (how long it lasts into the summer) was important because chicks had more time to develop their water-proof swimming feathers.

In some cases, being close to Adélie penguins made a difference. In other cases, Emperors preferred sites with shallow ocean depths below the colony.

Our results suggest that two of these habitat conditions support larger colonies: stable fast ice that lasts throughout the breeding season (with only small changes in the growth and retreat seasonal cycle) and a good balance between a fast-ice platform that is wide enough to raise chicks but close enough to the ocean to get food for them.

Emperor penguins need access to the ocean to feed their chicks during the breeding season. Sara Labrousse/French Polar Institute, CC BY-SA

We need further studies to clarify these links and the relationship between population size and habitat quality. In our study, we weren’t able to consider prey availability and there may be other factors that play an important role.

Previous research has already shown that Emperor penguins have limited capacity to disperse to find more suitable climate refuges. This is supported by the genetic partitioning among the penguin populations in different Antarctic regions we studied.

It is therefore unlikely Emperors would move far to avoid more severe climate impacts, even if “better” habitats existed and could host larger colonies.

Emperors don’t easily move to other breeding sites, even if the conditions are better. Sara Labrousse/French Polar Institute, CC BY-SA

Protecting penguin habitat

Climate change is currently one of the main pressures driving Emperor penguins closer to extinction.

However, the latest global assessment by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) clearly identified fishing activities as historic and current drivers of the erosion of marine biodiversity worldwide.

This is also true for Antarctica. While fishing pressure there is limited to a fraction of the global fishing fleet, some of the largest vessels target krill, a tiny shrimp-like crustacean consumed by many Antarctic predators, including Emperor penguins.

With climate models predicting further reductions in sea ice extent, new fishing grounds could open and amplify pressure on other Antarctic wildlife.

If we want to live in a world with Emperor penguins, the most important thing to do would be to cut greenhouse gas emissions steeply. Another key action could be to prevent fishing in areas where climate change will have the most impact.

In this respect, truly protected areas are one conservation tool at our disposal. Now that our research provides more detailed information about penguin habitats, we can begin the process of more careful planning for conservation.

The world’s largest marine protected area exists in the Ross Sea, which is home to about 25% of the world’s Emperor penguins. Lessons we learn from protection there could help mitigate future declines of Emperors around Antarctica.

Sara Labrousse, Chercheuse en écologie polaire, Sorbonne Université and Michelle LaRue, Associate Professor in Conservation Biology, University of Canterbury

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Read More........→October 04, 2023