Énergie nucléaire : « SMR » (petits réacteurs modulaires)

by Connaissance des Energies, 29 avril 2019

  • Les Small Modular Reactors (SMR) sont de petits réacteurs nucléaires réalisés en usines sous forme de modules.
  • Leur puissance varie généralement entre 10 et 300 MW.
  • Le déploiement des SMR est envisagé pour produire de l’électricité, en particulier dans des sites isolés, mais également pour des applications non électrogènes : chaleur, dessalement, production d’hydrogène, propulsion, etc.
  • Fin 2018, on dénombre une cinquantaine de projets de SMR, avec de nombreuses technologies à l’étude.

Les modules SMR » de NuScale Power pèseront près de 700 tonnes et pourront être transportés par camion ou par barge. (Image provided by NuScale Power, LLC)


by Andrew Montford, April 23, 2019 in GWPF

Extinction Rebellion seem to be everywhere at the moment. And everywhere their story is the same. We are in the middle of a climate catastrophe. As the Huffington Post put it,

Human-caused climate change is driving sea-level rise, drought, extreme weather and a biodiversity crisis that scientists have declared Earth’s sixth mass extinction event. As many as 150 species die off each day.

Scary eh? Surely that’s enough to justify the odd street protest?

It was therefore interesting to see read some remarks from Richard Betts today. Professor Betts is the head of climate impacts at the Met Office, so his views in this area carry a certain amount of weight. Asked what he thought were the top three negative impacts of climate change that have “absolutely started”, he replied:

  • Sea level rise
  • Increasing risk of high temperatures
  • Changes in phenology and distribution for numerous species

This left me agog. There was nothing about drought or hurricanes or any of the other manifestations of extreme weather that are said to be afflicting us; nothing about floods, or typhoons, or desertification or crashing crop yields or climate refugees, mass extinctions, skydiving walruses and any of the thousand and one tall tales that climate activists spin and the media faithfully repeat every day. The contrast between this take on currently observed negative impacts and David Attenborough’s risible Climate Change: the Facts programme last week is startling. The take home message is that most of what the “national treasure” told viewers about climate change was grubby insinuation rather than fact: less to do with science than with the BBC’s ongoing eco-campaign.

The Relationship between Atmospheric Carbon Dioxide Concentration and Global Temperature for the Last 425 Million Years

by William J. Davis, September 2017, in ResearchGate

Assessing human impacts on climate and biodiversity requires an understanding of the relationship between the concentration of carbon dioxide (CO2) in the Earth’s atmosphere and global temperature (T). Here I explore this relationship empirically using comprehensive, recently-compiled databases of stable-isotope proxies from the Phanerozoic Eon (~540 to 0 years before the present) and through complementary modeling using the atmospheric absorption/transmittance code MODTRAN. Atmospheric CO2 concentration is correlated weakly but negatively with linearly-detrended T proxies over the last 425 million years.