popular articles

The nuclear power plant of Saint-Laurent-des-Eaux, a titanic construction site for a second youth

The Saint-Laurent-des-Eaux nuclear power plant is undergoing a "complete check-up" to extend its life by ten years, with an investment five times higher than at the last review in 2013. This program is part of the Grand Carénage, EDF's largest industrial program since its creation in 1946, aimed at modernizing and extending the life of power plants beyond 40 years to cope with climate change.

Please share:

On the banks of the Loire River, reactor No. 2 at the Saint-Laurent-des-Eaux nuclear power plant has stopped delivering megawatt-hours to accommodate an army of workers at the service of a gigantic construction site: the time has come for a “complete check-up” to enable it to produce for another ten years, with climate change in its sights.

In the engine room, a large cathedral where electricity gushes out of the steam at the end of the turbo-alternator, the operators are busy amidst scaffolding and monumental boneless parts. For this giant “technical control”, the plant will host up to 2,700 employees simultaneously, instead of the usual 1,000.

“Right now, the plant has a higher level of safety than when it was commissioned” in 1983, assures Sylvie Richard, director of the “Grand Carénage”, the vast program launched in 2015 by EDF to modernize and extend the life of the plants beyond 40 years. Ten of EDF’s 900 MW reactors have successfully completed their fourth 10-yearly inspections. The one in Saint-Laurent, on the same level, began on January 21 and will last 7 months.

The stakes are high for these 40-year-old power plants, the oldest in the 56-reactor fleet: obtaining an operating license from the French Nuclear Safety Authority for another ten years. To achieve this, 17,000 operations are planned, for an investment “five times higher than during the last periodic review” in 2013, emphasizes the site director, Nicolas André.

The reactor first undergoes three regulatory tests: in addition to the inspection of the stainless steel vessel from every angle, a hydraulic test of the primary circuit and a test of the concrete containment, which prevents the escape of radioactive products to the outside in case of an accident, are planned. “The enclosure is inflated with pressurized air to check its tightness,” explains Arnaud Besnard, maintenance coordinator in the reactor building.

Also on the agenda: major maintenance work such as the replacement of the turbo-generator rotors and the addition of additional cooling systems and a corium stabilizer, to recover an accidental leak of molten fuel under the reactor.

Next project, the climate

The vast construction site of the extension is at the heart of the Grand Carénage, whose cumulative cost of the first (2015-2021) and second (2022-2028) phases amounts to 66 billion euros. “It’s the biggest industrial program since the creation of EDF in 1946,” summarizes Sylvie Richard.

In its first phase, 800 modifications were made, based on national and international feedback, in particular from the Fukushima disaster in Japan in 2011. They include the construction of backup water and power capabilities to deal with a power failure that would threaten the cooling of the facility. “It’s a great asset for continued operation,” says Sylvie Richard.

The government has decided that, in addition to the construction of at least six new EPR2 reactors, the reactors will have to be extended beyond 50 years if possible. “It’s no longer a taboo, other countries are doing it,” says Sylvie Richard, referring to the United States. EDF is already working on the program for the fifth ten-yearly outage for the plants that will reach 50 years of age in 2029. “We have called it a ten-year visit to the climate change” because “it will include important scenarios that will have to demonstrate the performance of our equipment”, emphasizes the Director of the Grand Carénage.

EDF assures that it is not starting “from scratch”: “all the power plants have undergone significant changes to resist aggression – floods, snowstorms, tornadoes”, it adds. “We are also improving the performance of the cooling systems of the plants”, which represents the third largest water consumption in the country (12%) and the major issue posed by global warming in nuclear power.

In a report dated March 21, the Cour des Comptes called on EDF to “strengthen its research” on these systems to make them more “water-efficient”, noting that “no innovation” had been implemented on the existing fleet and, even more, “the absence of any marked evolution” for future EPRs.

On Thursday, President Emmanuel Macron promised investments in nuclear power “to save water,” without putting a figure on them.

Register free of charge for uninterrupted access.

Publicite

Recently published in

The agreement between NANO Nuclear Energy and the University of Illinois launches the first university-based installation of the KRONOS MMR reactor, marking the beginning of construction and certification procedures.
Polskie Elektrownie Jądrowe has signed a development agreement with the Westinghouse-Bechtel consortium, ensuring continuity of Poland's first nuclear plant project after a previous contract expired.
Polskie Elektrownie Jądrowe has signed a development agreement with the Westinghouse-Bechtel consortium, ensuring continuity of Poland's first nuclear plant project after a previous contract expired.
Fermi Energia has signed a strategic agreement with Samsung C&T to develop two small modular reactors in Estonia, targeting commercial operation by 2035.
Fermi Energia has signed a strategic agreement with Samsung C&T to develop two small modular reactors in Estonia, targeting commercial operation by 2035.
China National Nuclear Corporation mobilizes international investors and financial partners for a unique nuclear project combining two distinct technologies to simultaneously supply industrial heat and electricity, marking a new strategic step for China's energy industry.
China National Nuclear Corporation mobilizes international investors and financial partners for a unique nuclear project combining two distinct technologies to simultaneously supply industrial heat and electricity, marking a new strategic step for China's energy industry.
Framatome and TechnicAtome have acquired Segault, a strategic nuclear valve manufacturer, thereby blocking a takeover by the American firm Flowserve following opposition from the French government.
The United States Nuclear Regulatory Commission has approved a 20-year extension for the operating licences of Oconee Nuclear Station, reinforcing energy supply in the Carolinas amid growing regional demand.
The United States Nuclear Regulatory Commission has approved a 20-year extension for the operating licences of Oconee Nuclear Station, reinforcing energy supply in the Carolinas amid growing regional demand.
A radioactive steam leak detected in the reactor building of Flamanville unit 1 forces EDF to postpone its restart by one month, according to the Nuclear Safety and Radiation Protection Authority.
A radioactive steam leak detected in the reactor building of Flamanville unit 1 forces EDF to postpone its restart by one month, according to the Nuclear Safety and Radiation Protection Authority.
French firm Framatome has been selected to modernise control systems at Switzerland’s Leibstadt nuclear plant, as part of a strategic investment aiming to extend its operation through 2045.
French firm Framatome has been selected to modernise control systems at Switzerland’s Leibstadt nuclear plant, as part of a strategic investment aiming to extend its operation through 2045.
The U.S. Department of Energy reopens a $900M envelope to finance the construction of third-generation small modular reactors, aiming to rapidly expand national power capacity.
HYLENR Technologies has signed a memorandum of understanding with TakeMe2Space to test a low-energy nuclear reaction power solution aboard satellites designed for orbital computing.
HYLENR Technologies has signed a memorandum of understanding with TakeMe2Space to test a low-energy nuclear reaction power solution aboard satellites designed for orbital computing.
Japanese researchers have assembled a rechargeable battery harnessing the chemical properties of uranium, aiming to convert stored depleted uranium into a strategic energy storage resource.
Japanese researchers have assembled a rechargeable battery harnessing the chemical properties of uranium, aiming to convert stored depleted uranium into a strategic energy storage resource.
The French government is pressing EDF and industrial players to reach a pricing agreement by summer, amid ongoing tensions over nuclear supply contracts.
The French government is pressing EDF and industrial players to reach a pricing agreement by summer, amid ongoing tensions over nuclear supply contracts.
Two small modular reactor developers begin preliminary engagement with the US nuclear authority, ahead of filing applications for distinct projects targeting industrial use cases.
Fortum continues preparations for new nuclear capacity in Finland and Sweden, selecting three suppliers after a two-year feasibility study.
Fortum continues preparations for new nuclear capacity in Finland and Sweden, selecting three suppliers after a two-year feasibility study.
NRG-Pallas will conduct irradiation tests necessary for qualifying materials and fuel of Kairos Power's modular reactor, a critical prerequisite for regulatory approval in the United States.
NRG-Pallas will conduct irradiation tests necessary for qualifying materials and fuel of Kairos Power's modular reactor, a critical prerequisite for regulatory approval in the United States.
Tokyo Electric Power Company will begin next week the removal of thousands of contaminated sandbags, stored since 2011 in the Fukushima Daiichi basements, using robots designed for high-radiation environments.
Tokyo Electric Power Company will begin next week the removal of thousands of contaminated sandbags, stored since 2011 in the Fukushima Daiichi basements, using robots designed for high-radiation environments.
Welding of the main reactor for Egypt’s El Dabaa nuclear power plant has been completed in Russia, marking a major milestone in the development of the country's first civilian nuclear programme.
Kazakh President Kassym-Jomart Tokayev has established a new agency to oversee nuclear energy, appointing Almassadam Satkaliyev as its head. This structure aims to enhance the country’s energy security and support its long-term nuclear ambitions.
Kazakh President Kassym-Jomart Tokayev has established a new agency to oversee nuclear energy, appointing Almassadam Satkaliyev as its head. This structure aims to enhance the country’s energy security and support its long-term nuclear ambitions.
The US Department of Energy allocated a $57 million loan to Holtec International to support the relaunch of the Palisades nuclear plant, which has been closed since 2022, to ensure compliance with NRC safety standards.
The US Department of Energy allocated a $57 million loan to Holtec International to support the relaunch of the Palisades nuclear plant, which has been closed since 2022, to ensure compliance with NRC safety standards.
Orano and Navoiyuran have signed a strategic agreement for the industrial development of the South Djengeldi uranium deposit in Uzbekistan, with the entry of Japanese company ITOCHU Corporation as a minority partner.
Orano and Navoiyuran have signed a strategic agreement for the industrial development of the South Djengeldi uranium deposit in Uzbekistan, with the entry of Japanese company ITOCHU Corporation as a minority partner.
President Emmanuel Macron has announced an additional delay for the commissioning of the first EPR2 reactors, now set for 2038 instead of 2035. This decision was made during a meeting dedicated to the nuclear program.
Engie has finalized a ten-year extension agreement with the Belgian state for the Doel 4 and Tihange 3 nuclear reactors, including a financial responsibility transfer related to spent fuel, following recent approval by the European Commission.
Engie has finalized a ten-year extension agreement with the Belgian state for the Doel 4 and Tihange 3 nuclear reactors, including a financial responsibility transfer related to spent fuel, following recent approval by the European Commission.
Tests on the concrete of the EPR2 Penly seawall have raised doubts about its compliance with safety standards, according to Mediapart and Reporterre. EDF and Eiffage contest these claims, asserting that the material meets technical requirements.
Tests on the concrete of the EPR2 Penly seawall have raised doubts about its compliance with safety standards, according to Mediapart and Reporterre. EDF and Eiffage contest these claims, asserting that the material meets technical requirements.
On Monday, President Emmanuel Macron will chair a Nuclear Policy Council focused on small modular reactors (SMRs) and uranium supply, within a global context of renewed interest in nuclear energy.
On Monday, President Emmanuel Macron will chair a Nuclear Policy Council focused on small modular reactors (SMRs) and uranium supply, within a global context of renewed interest in nuclear energy.

Advertising