[Nucléaire] Relance du nucléaire aux USA.... ou pas ?

Répondre


Cette question vous permet de vous prémunir contre les soumissions automatisées et intensives effectuées par des robots malveillants.
Émoticônes
:D :geek: :ugeek: :ghost: :wtf: :-D :) :-) :-( :-o :shock: :? 8-) :lol: :-x :-P :oops: :cry: :evil: :twisted: :roll: ;) ;-) :!: :?: :idea: :arrow: :-| :mrgreen: =D> #-o =P~ :^o [-X [-o< 8-[ [-( :-k ](*,) :-" O:) =; :-& :-({|= :-$ :-s \:D/ :-#
Plus d’émoticônes

Le BBCode est activé
La balise [img] est activée
La balise [flash] est activée
La balise [url] est activée
Les émoticônes sont activées

Relecture du sujet
   

Agrandir Relecture du sujet : [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 27 avr. 2025, 12:27

suite de ce post du 15 juin 2024 viewtopic.php?p=2392860#p2392860
enCore Energy accélère l’expansion du projet d’uranium Alta Mesa avec 32 puits opérationnels
La société américaine enCore Energy poursuit l’optimisation de son projet d’uranium au Texas avec une cadence record d’installation de puits et un renforcement de son équipe dirigeante.
https://energynews.pro/encore-energy-ac ... e_vignette

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 26 avr. 2025, 10:36

Chargement de combustible à plus haut taux d'enrichissement en U-235 pour la centrale de Vogtle unit2
Westinghouse's LEU+ fuel loaded into Vogtle 2

Tuesday, 15 April 2025

Westinghouse Electric Company's lead test assemblies with LEU+ fuel have been loaded into Unit 2 of the Vogtle nuclear power plant - a first for such fuel in a commercial reactor in the USA.

Image
The delivery of LEU+ fuel to Vogtle (Image: Southern Nuclear)

Commercial reactors currently operate on fuel that typically contains 3-5% by weight of uranium-235 - the main fissile isotope that produces energy during a chain reaction, known as low-enriched uranium (LEU). LEU+ fuel is enriched to 5-10% uranium-235. The higher enrichment could help extend the length of fuel cycles, lead to power uprates, and lower costs by reducing the number of outages needed for refuelling.

The advanced fuel is enriched to 6% uranium-235 and was developed through the US Department of Energy (DOE) Accident Tolerant Fuel Program to help improve fuel cycle safety and lower operational costs. The DOE said: "The pellets, which also include additives expected to enhance safety performance, were derived from higher enriched uranium oxide powder that was first prepared by Idaho National Laboratory. The powder was further processed into fuel pellets and fabricated into pins before they were shipped to Vogtle Unit 2 for commercial testing."

The EnCore ATF Lead Test Assemblies with greater-than-5% LEU+ ADOPT fuel, chromium coated cladding and AXIOM cladding, were manufactured at Westinghouse’s Columbia Fuel Fabrication Facility in Hopkins, South Carolina.

Image
The LEU+ fuel loaded into Vogtle Unit 2 (Image: Southern Nuclear)

Tarik Choho, Westinghouse Nuclear Fuel President, said: “We are proud to have achieved this milestone alongside the US Department of Energy and Southern Nuclear. Our priority is to provide safe, reliable and high-performing fuel to support our customers in their long-term operational needs. LEU+ fuel is a perfect example of how we can help reduce the number of outages in nuclear power plants."

Pete Sena, Southern Nuclear Chairman, President and CEO said: "This achievement is a significant step forward for not only the resiliency of the entire US operating fleet, but future nuclear technologies. Our goal is to operate our units for longer periods with higher output, and with higher enriched fuel, we’re even better positioned to meet the growing energy demands of the state of Georgia."

The lead test assemblies will undergo testing for four and a half years at Plant Vogtle. The fuel will be examined after each fuel cycle.
https://www.world-nuclear-news.org/arti ... n-vogtle-2

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 20 avr. 2025, 00:20

TVA to submit SMR construction permit application
Thursday, 17 April 2025
The Tennessee Valley Authority intends to submit the Construction Permit Application for the Clinch River small modular reactor to the US regulator by June.

Image
TVA has picked out the location for the first SMR at Clinch River (Image: TVA/X)

"The Tennessee Valley Authority (TVA) intends to submit a CPA to license construction of a GE-Hitachi BWRX-300 small modular reactor (SMR) at TVA's Clinch River Nuclear Site (CRN Site)," the authority said in a Notification of Intent to the US Nuclear Regulatory Commission (NRC). According to the notification, it plans to submit the first part of the application, including the Clinch River Nuclear Site Environmental Report, this month and the remainder "by June 2025".

The Construction Permit Application - or CPA - is essentially the blueprint for the plant's design and safety systems. NRC approval must be granted before construction can begin.
.................
https://www.world-nuclear-news.org/arti ... pplication

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 06 avr. 2025, 10:35

US uranium concentrate production in 2024 reaches highest levels since 2018
This surge was primarily driven by two in-situ recovery facilities in Texas and Wyoming, alongside the White Mesa Mill in Utah.

April 3, 2025

US uranium concentrate production reached a six-year high in 2024, surpassing levels not seen since 2018, according to the US Energy Information Administration’s (EIA) quarterly Domestic Uranium Production Report.

This surge was primarily driven by two in-situ recovery facilities in Texas and Wyoming, alongside the White Mesa Mill in Utah, the only operational uranium mill in the US.

Energy Fuels’ White Mesa Mill is capable of producing not only uranium but also rare earth minerals and vanadium. The company’s recent annual financial disclosure indicates a strategic focus on uranium production for 2025.

In the fourth quarter of 2024 (Q4 2024), uranium concentrate production in the US reached a total of 375,401lb, more than three-times the production of 121,296lb recorded in Q3.

This uranium output was generated at seven facilities: four in Wyoming, including the Nichols Ranch ISR Project, Lost Creek Project, Ross CPP and Smith Ranch-Highland Operation; two in Texas, including the Alta Mesa Project and Rosita; and one in Utah, the White Mesa Mill.

Uranium concentrate is a key material for nuclear reactors and certain medical applications.

The increased demand for electricity in the US, fuelled by data centres, local manufacturing and the electrification of transport and buildings, has reignited interest in nuclear energy.

Efforts are under way to restart two completely shut-down nuclear reactors, including one at the historic Three Mile Island site, reported Reuters.

In response, the federal government has awarded contracts to six companies for the production of uranium fuel.

In contrast, the US uranium market is slowing as nuclear power companies postpone purchases and new contracts amid President Trump’s tariff threats.
https://www.mining-technology.com/news/ ... &cf-closed

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 05 avr. 2025, 16:55

Application lodged for construction of Texas SMR plant

Monday, 31 March 2025

Industrial giant Dow and X-Energy Reactor Company have submitted a construction licence application to the US Nuclear Regulatory Commission for the proposed advanced nuclear project at Dow's Seadrift site in Texas.
..................
https://www.world-nuclear-news.org/arti ... -smr-plant

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 22 févr. 2025, 12:33

Milestone for Wyoming uranium operation

20 February 2025

Uranium Energy Corp's Irigaray Central Processing Plant has produced its first dried and drummed uranium concentrates since the resumption of in-situ recovery operations at the company's Christensen Ranch project.
........................
lire https://www.world-nuclear-news.org/arti ... -operation

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 21 déc. 2024, 13:50

Wyoming uranium project returns to production
Production operations at the Lance project have officially commenced after a five-year hiatus, with the first dry yellowcake product expected in March.


20 December 2024

Image
The Lance Central Processing Plant (Image: Peninsula Energy)

Operations restarted within selected areas of Mine Unit 1 at the in-situ leach - also known as in-situ recovery - project on 18 December. The project is owned by Australia-based owner Peninsula Energy Ltd. Strata Energy Inc is the company's 100%-owned US subsidiary.

Since Lance last produced uranium commercially in 2019, it has transitioned to low-pH operations. In September last year, Peninsula decided to bring forward plans for a central resin processing plant at Lance after a toll-milling agreement to process loaded resins from the operation at Uranium Energy Corp's Irigaray central processing plant fell through. When complete, the process plant will be able to produce up to 2 million pounds U3O8 (76,929 tU) of dry yellowcake product per year.

The production stream from Mine Unit 1 is being routed to the rebuilt Phase 1 satellite plant ion exchange system for uranium capture, and the captured uranium will be stored on the ion exchange resin until the second phase of the new on-site recovery plant is completed in early 2025, the company said. It expects the resin elution and precipitation circuits in the Phase 2 plant area to be completed by mid-January, when first elutions and yellowcake precipitation can begin. The completed construction of the yellowcake filtration and drying circuits are currently scheduled for February, which would lead to production of the first dry yellowcake product by early March.

Image
The processing plant interior (Image: Peninsula Energy)

"This is a very exciting moment for the team and our shareholders to have finally pressed the button on starting production," Peninsula Managing Director and CEO Yayne Heili said, adding that the milestone had been "years in the making, a lot of hard work, and with a fair share of challenges".

"Importantly, Peninsula is now North America's newest fully independent uranium producer. We have restarted Lance at an opportune time, with the long-term fundamentals and demand for uranium incredibly strong, as nuclear energy grows into the leading and most reliable clean energy solution," he said.
https://www.world-nuclear-news.org/arti ... production

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 15 déc. 2024, 12:25

US offers six companies contracts to make uranium fuel for nuclear plants

Reuters | December 10, 2024

The US Energy Department said on Tuesday it is offering initial contracts to six companies to produce domestic uranium fuel for conventional nuclear plants to generate electricity.


The department is trying to kick-start a domestic uranium fuel supply chain to reduce dependence on Russia, from which US reactors get about 25% of their enriched uranium in recent years. The United States put a ban on the imports from Russia as part of a package of sanctions on Moscow over its full scale invasion of Ukraine. The ban allows waivers until 2028.

The US is investigating uranium imports to see if China is helping Russia circumvent the ban.

“These contracts generated from this action will help spur the safe and responsible build-out of uranium enrichment capacity in the United States,” said Michael Goff, principal deputy assistant secretary for nuclear energy.

The following companies won contracts: Centrus’s American Centrifuge Operating; General Matter; Global Laser Enrichment; Urenco’s Louisiana Energy Services; Laser Isotope Separation Technologies and Orano Federal Services.

Four of those companies got initial US contracts in October to produce a more enriched fuel called high-assay low-enriched uranium, or HALEU, to be used in smaller reactors that are not yet commercial.

Conventional uranium fuel is up to 5% enriched while HALEU is up to 20% enriched.

The contracts at the start are for a minimum of $2 million. They will last for up to 10 years with $2.7 billion available for the program.

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 23 nov. 2024, 15:40

Centrus va relancer la production de centrifugeuse dans le Tennessee.
Centrus to restart centrifuge manufacturing, expand capacity

21 November 2024

Centrus Energy Corp is to resume centrifuge manufacturing activities and expand capacity at its facility in Tennessee as well as investing an additional USD60 million over the next 18 months for the effort to support a potential large-scale expansion of uranium enrichment at its American Centrifuge Plant in Piketon, Ohio.

Image
Centrus's centrifuges (Image: Centrus)

Such a large-scale expansion would require a multi-billion dollar public and private investment, the company said. It has recently secured more than USD2 billion in contingent purchase commitments from customers to support future production of low-enriched uranium (LEU), as well as two awards from the US Department of Energy (DOE) to support the enrichment and deconversion of high-assay, low-enriched uranium (HALEU) - uranium enriched to contain between 5% and 20% uranium-235 that will be used by many advanced reactors.

Centrus President and CEO Amir Vexler said this latest investment "will jump-start what we hope will be a multi-billion dollar public and private commitment to re-establishing America's uranium enrichment capacity at scale while reducing our dependence on foreign nations".

"The all-American solution we are offering represents the best path forward to ensure a reliable fuel supply for today's reactors, support the deployment of next generation reactors, and meet America's enduring national security needs for enriched uranium. Most importantly, it puts us in position to execute an expansion quickly," he said.

"We have always said that restoring US enrichment capacity at scale requires a public-private partnership, including a robust federal investment alongside customer offtake commitments and private capital. This additional investment by Centrus reflects our continued willingness to step up to the plate in such a partnership."

Centrus's American Centrifuge technology is exclusively manufactured at its Technology and Manufacturing Center in Oak Ridge, supported by a domestic supply chain of 14 major suppliers and dozens of smaller suppliers.

For some years the USA has relied on imported material rather than domestic uranium enrichment capacity: currently, the only operating commercial uranium enrichment capacity in the USA is the Urenco USA (UUSA) plant at Eunice in New Mexico, which uses a European centrifuge design that is exclusively manufactured in the Netherlands and is currently being expanded. French company Orano is also looking to build a new centrifuge uranium enrichment facility, for which it has selected a preferred site in Oak Ridge.

But the US administration has been taking steps to lessen US reliance on overseas suppliers, particularly Russia, on which the USA had been relying for a sizeable portion of its enriched uranium requirements: 27% of the uranium enrichment services purchased by US nuclear plant operators came from Russia, more than any other foreign supplier.

A prohibition on Russian LEU imports has been in place since August. Centrus had obtained a waiver allowing it to import low-enriched uranium from Russia for delivery to US customers in 2024 and 2025, but the Russian government has now placed its own ban on exports of LEU to the USA. Russian government-owned company Tenex - Centrus's largest supplier of LEU for delivery to its US and international customers - has said it will seek the necessary export licences to meet its obligations, but Centrus said in a filing to the US Securities and Exchange Commission that its ability to meet its own delivery obligations will be affected if Tenex cannot obtain the licences.

Centrus is competing for more than USD3.4 billion of DOE funding to jumpstart domestic nuclear fuel production. As well as the recent award of USD2 million for domestic HALEU production, the company, via its American Centrifuge Operating subsidiary, is one of several selected under a separate solicitation aimed at HALEU deconversion. A third solicitation, aimed at US production of LEU for existing reactors, has not yet been awarded.
https://www.world-nuclear-news.org/arti ... d-capacity

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 23 nov. 2024, 15:13

suite de ce post du 6 Aout 2024 viewtopic.php?p=2396052#p2396052
The US Nuclear Regulatory Commission has voted to issue construction permits to Kairos Power for the Hermes 2 Demonstration Plant.

Image

The permits will authorise Kairos to build a facility with two 35 MWt molten salt-cooled reactors that would also include a shared power generation system.

Kairos' Hermes Low-Power Demonstration Reactor became the first US Gen IV reactor to receive a Nuclear Regulatory Commission (NRC) construction permit in December 2023, and now Hermes 2 becomes the first electricity-producing Gen IV plant to be approved for construction in the USA, Kairos said.

Hermes 2 is intended to provide operational data to support the development of a larger version for commercial electricity production. Kairos submitted its application to build Hermes 2 in July 2023, and the NRC issued its final safety evaluation for the permits in July this year, and the final environmental assessment for site in August.

"While keeping safety at the forefront, the permitting process was quite efficient, and we issued these permits in less than 18 months," said NRC Chair Christopher Hanson "This shows we can rapidly apply relevant conclusions from earlier reviews to promptly reach decisions on new reactors."

Following a new, streamlined mandatory hearing process conducted via written documents, the NRC said it has authorised the Office of Nuclear Reactor Regulation to issue the permits, having found the review by NRC staff of the Hermes 2 application "adequate to make the necessary regulatory safety and environmental findings". The permits are expected to be issued in the near future.

"The Commission's approval of the Hermes 2 construction permits marks an important step toward delivering clean electricity from advanced reactors to support decarbonisation," Kairos CEO and co-founder Mike Laufer said. "We are proud to lead the industry in advanced reactor licensing and look forward to continued collaboration with the NRC as we chart a path forward with future applications."

Hermes 2 plant will be built on land adjacent to the Hermes reactor, which is currently under construction. Kairos Power must apply for and obtain an operating licence from the NRC before the plant can start up.
https://www.world-nuclear-news.org/arti ... ion-permit

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 17 nov. 2024, 11:36

Russia takes aim at US nuclear power by throttling uranium

Bloomberg News | November 15, 2024 |

Russia is temporarily limiting exports of enriched uranium to the US, creating potential supply risks to utilities operating American reactors that generate almost a fifth of the nation’s electricity.


The Russian government didn’t provide details of the restrictions or their duration in a Friday statement on Telegram. Utilities tend to make purchases well in advance, so any impact is unlikely to be immediate.

As Russia’s prolonged war in Ukraine has made it increasingly unpopular on the world stage, the nation has repeatedly signaled a willingness to use its vast energy resources as geopolitical bargaining chips. Russia also told Austria on Friday it’s throttling gas supplies, interrupting a six-decade supply agreement currently covering 80% of demand because of a legal dispute.

Image

The latest move targets a particularly vulnerable US link in the nuclear fuel cycle. Russia controls almost half the world’s capacity to separate the uranium isotopes needed in reactors, and last year supplied more than a quarter of the US’s enriched fuel.

While most deliveries have already been made this year, a ban could have implications from 2025, said Jonathan Hinze, president of UxC, which tracks uranium-fuel markets. That may leave some reactor operators without an alternative supplier.

“There would be some utilities maybe that would be expecting that material and now might not get it,” he said.

Canada’s Cameco Corp., one of the world’s biggest uranium miners, said the cumulative risks to the supply of nuclear fuel are significant.

“To break the dependence on Russia and other state-owned enterprises, coordinated western responses are required,” Cameco spokeswoman Veronica Baker said in a statement.

Russia said the move was a response to a ban imposed by the US on imports of Russian enriched uranium. President Joe Biden signed the legislation in May, but it allows for shipments to continue until 2028 under a system of waivers. The exceptions underscore a simple fact about the industry — that the US has allowed its domestic enrichment capacity to languish.

“We don’t have enough enriched uranium here,” Chris Gadomski, head nuclear analyst for BloombergNEF, said in an interview. “They should have been stockpiling enriched uranium in anticipation of this happening.”

While the Biden administration has launched a multibillion-dollar effort to restart the nation’s domestic uranium enrichment capabilities, it is still in its nascent form. The US has just one commercial enrichment facility in New Mexico, which is owned by a British, Dutch and German consortium, Urenco Ltd.

Urenco’s US unit supplies about one-third of the enriched uranium used in American reactors, and is working to expand capacity 15% by 2027.

The company “recognizes the critical need to ensure a reliable, secure and domestically supported supply of enriched uranium for the US nuclear energy industry, particularly as geopolitical tensions highlight the risks of reliance on unstable sources,” Rebecca Astles, Urenco’s head of communications, said by email.

Among the recipients of waivers to import Russian reactor fuel are Constellation Energy Corp., the biggest US nuclear operator, and Centrus Energy Corp., a nuclear fuel supplier. Other requests are pending. Constellation Energy fell as much as 1.7% in New York on Friday. Centrus is the biggest US trader of Russian enriched uranium — its stock fell as much as 13%.

In a statement, Centrus said the Russian decree wasn’t available to the company and it had not been able to verify or assess its implications.

“Should Tenex be unable to perform as expected under our supply agreement, Centrus has alternatives under consideration that could be used to mitigate a portion of the near-term impacts,” the company said, referring to Russia’s state-owned uranium supplier. “We expect Tenex to take the necessary actions to continue meeting its contractual obligations.”

Shares of other uranium or uranium-related companies rose, with Cameco climbing more than 6% at one point, while the US miner Ur-Energy Inc. surged as much as 10% and rival Uranium Energy Corp. jumped 13% before giving back most gains.
https://www.mining.com/web/russia-tempo ... nts-to-us/

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 04 nov. 2024, 23:18

Les énergéticiens nucléaires chutent à Wall Street après le rejet d'un projet d'Amazon

AFP le 04 nov. 2024

Plusieurs énergéticiens nucléaires dérapaient lundi à la Bourse de New York, déstabilisés par le refus du régulateur américain de l'énergie d'un projet de fourniture de courant à Amazon.

La nouvelle a jeté un coup de froid sur le secteur, dopé récemment par une série d'accords avec plusieurs géants de l'informatique à distance (cloud) pour assurer leur alimentation en électricité d'origine nucléaire.

En mars, Amazon s'était entendu avec l'opérateur Talen Energy pour lui racheter un centre de stockage et traitement de données (data center), directement alimenté par la centrale nucléaire de Susquehanna (Pennyslvanie) et qui se trouve sur le même site.

En juin, PJM Interconnection, organisation membre du réseau électrique du nord-est des Etats-Unis a soumis à l'Autorité de régulation de l'énergie (FERC) une demande pour augmenter la capacité d'alimentation de ce centre de données de 300 à 480 mégawatts.

Dans un avis daté de vendredi, la FERC a rejeté cette requête, l'un des cinq membres du conseil du régulateur, Mark Christie, estimant que ce type de projet "pourrait avoir des conséquences majeures pour la fiabilité du réseau et les coûts pour les consommateurs".

Talen Energy a contesté cette décision, affirmant que son projet était "juste, raisonnable et dans l'intérêt des consommateurs", selon un communiqué publié dimanche.

La position du régulateur "va avoir pour effet de ralentir le développement économique d'Etats comme la Pennsylvanie, l'Ohio et le New Jersey", a fait valoir le groupe, qui a indiqué poursuivre son dialogue avec la FERC pour trouver une issue plus favorable au dossier.

Ce développement a fait trembler plusieurs énergéticiens à Wall Street, à commencer par Talen Energy, qui perdait 2,42% vers 16H30 GMT.

Grand opérateur de centrales nucléaires aux Etats-Unis, Constellation Energy décrochait lui de 9,75%, tandis que son concurrent Vistra Corp abandonnait lui 3,05%.

Autres victimes de cette crispation des investisseurs, les start-up qui développent actuellement des réacteurs nucléaires de nouvelle génération, les SMR (small modular reactor).

Oklo, présidé par le patron d'OpenAI, Sam Altman, était mal orienté (-3,37%), de même que NuScale (-4,23%).

Amazon, Microsoft et Google ont tous signé des partenariats avec des opérateurs nucléaires pour répondre à l'accroissement de leurs immenses besoins en électricité.

Le développement de l'intelligence artificielle générative a encore accéléré la consommation d'énergie de leurs centres de traitement et de stockage de données, déjà conséquente.
https://www.connaissancedesenergies.org ... zon-241104

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 20 oct. 2024, 16:26

US awards contracts for making higher enriched uranium for new reactors

Reuters | October 17, 2024

The US rolled out initial contracts to four companies hoping to produce a new, more highly enriched uranium fuel for an expected wave of high-tech reactors, the US Energy Department said on Thursday.


Russia is currently the only country that makes the fuel called high-assay low-enriched uranium fuel, or HALEU, in commercial volumes. Funds to make the fuel domestically were included in a law to ban uranium shipments from Russia fully by 2028.

Centrus Energy said its subsidiary, American Centrifuge Operating, got a contract to produce HALEU, which is expected to be used in a variety of small modular reactors planned to be built starting around 2030.

The other companies are Urenco USA, which is a British, Dutch, German firm with operations in New Mexico; Orano USA, based in Maryland with global headquarters in France; and a company called General Matter.

Urenco said it got a contract for 10 years to make an “indefinite quantity” of HALEU.

President Joe Biden’s administration believes nuclear power, which generates virtually emissions-free electricity, is critical in fighting climate change and to meet rising power demand from artificial intelligence and other consumers.

“All contracts will last for up to 10 years and each awardee receives a minimum contract of $2 million, with up to $2.7 billion available for these services, subject to the availability of appropriations,” the Energy Department said.

The ultimate amount of money associated with the award depends upon orders issued by the US Department of Energy, Centrus said.

HALEU is uranium enriched to between 5% and 20%, which backers say has the potential to make new high-tech reactors more efficient.

HALEU’s critics say it is a weapons risk if it gets into the wrong hands and recommend limiting its enrichment to between 10% and 12% for safety. Uranium fuel used in today’s reactors is enriched to about 5%.
https://www.mining.com/web/us-awards-co ... -reactors/

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par energy_isere » 20 sept. 2024, 22:28

Projet de redémarrer le réacteur 1 de Three Miles Island aprés 5 ans d'arrêt :
Les Etats-Unis renouent avec le nucléaire. Le groupe d’énergie américain Constellation a annoncé, ce vendredi 20 septembre, la relance d’une unité nucléaire à Three Mile Island (TMI) en Pennsylvanie, où avait eu lieu le plus grave accident nucléaire de l’histoire des Etats-Unis en 1979. Objectif : fournir en électricité des centres de données de Microsoft. Selon un communiqué, l’accord signé avec le géant informatique américain porte sur 20 ans et permettra de relancer l’unité 1, voisine de celle qui avait été le théâtre de l’accident il y a 45 ans.

20 sept 2024

Restaurer la centrale

L’unité 1 était à l’arrêt depuis 2019. Avant sa mise hors service pour des raisons économiques, celle-ci était d’une capacité de production de 837 mégawatts, suffisante pour alimenter plus de 800 000 foyers, rappelle le communiqué de Constellation, qui l’avait rachetée en 1999. «Alimenter les industries essentielles à la compétitivité économique et technologique mondiale de notre pays, y compris les centres de données, nécessite une abondance d’énergie sans carbone et fiable à chaque heure de la journée, et les centrales nucléaires sont les seules sources d’énergie qui peuvent constamment tenir cette promesse», a fait valoir le PDG de Constellation, Joe Dominguez. Des investissements importants vont être réalisés pour restaurer la centrale, notamment la turbine, le générateur et les systèmes de refroidissement.

D’autant qu’elle possède un lourd passé. En 2009, une contamination radioactive mineure se produit sur le site de TMI, touchant un petit groupe d’employés. Mais c’est la date du 28 mars 1979 qui reste dans les mémoires. Après une succession de pannes et de mauvaises manipulations d’origine humaine, le cœur du réacteur de l’unité 2 fond, en raison d’un déficit de refroidissement. Aucun rejet radioactif majeur n’aurait été constaté, mais l’événement a tout de même été classé 5 sur l’échelle des risques nucléaires, qui en compte 7. Et même si l’incident n’a causé ni morts, ni blessés, il a refroidi l’enthousiasme du gouvernement américain à l’égard du nucléaire. Depuis Three Mile Island, plus aucune centrale civile n’a été construite aux Etats-Unis.

Consommation électrique colossale

Le redémarrage du réacteur nucléaire de l’unité 1 ne se fera pas en une journée. Il nécessite au préalable l’approbation de la Commission de réglementation nucléaire des États-Unis, après un examen complet de la sécurité et de l’environnement. Le site, qui pourrait créer 3 400 emplois directs et indirects, devrait être de nouveau opérationnel en 2028. «Cet accord constitue une étape majeure dans les efforts de Microsoft pour aider à décarboner le réseau», s’est félicité Bobby Hollis, responsable de l’énergie pour le géant américain, cité dans le communiqué.

Le développement de l’intelligence artificielle nécessite d’énormes capacités de calcul, assurées par des légions de serveurs informatiques, logés dans des centres de données, appelés data centers. La consommation électrique de ces serveurs est colossale et menace de saturer le réseau électrique américain si ses capacités ne sont pas étendues grâce à l’addition de nouvelles ressources. Mercredi, Microsoft a annoncé en ce sens s’associer avec le gestionnaire d’actifs BlackRock et des fonds pour investir 100 milliards de dollars dans des infrastructures dédiées au développement de l’intelligence artificielle. Les fonds iront à la création ou à l’extension de centres de données ainsi qu’à la construction d’infrastructures de production d’électricité, pour alimenter les installations dédiées à l’IA. Très énergivores, elles font exploser les émissions de gaz à effet de serre des multinationales de la tech.
https://www.msn.com/fr-fr/actualite/mon ... d686&ei=49

Re: [Nucléaire] Relance du nucléaire aux USA.... ou pas ?

par GillesH38 » 17 sept. 2024, 05:37

le design est original mais ça reste un réacteur à U235 conventionnel, donc avec les mêmes limites en terme de combustible (10 fois moins de réserves d'U235 que de fossiles). Tel qu'il est construit, ça ne résoudrait aucun problème de réserves ou de climat. Tout l'U235 facilement accessible du monde ne peut économiser au max que 0,2°C de réchauffement, et encore, à condition que les fossiles épargnés ne soient pas brulés ailleurs ou plus tard, ce qui comme j'ai déjà expliqué de nombreuses fois , n'a aucune raison de se produire.

Haut