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France's Gravelines Nuclear Power Plant Reports Multiple INES Level 0 Events

France's Gravelines nuclear power plant recently disclosed significant events reported to the French Nuclear Safety and Radiation Protection Authority (ASNR). The events cover safety, operations, and radiation protection, and were all rated as Level 0 on the International Nuclear and Radiological Event Scale (INES), i.e., below the scale threshold, with no actual impact on facility safety, personnel health, or the environment. In a generic safety event involving EDF's 900 MWe-class nuclear reactor units, EDF discovered during inspections at the Cruas nuclear power plant that certain commercially supplied electric servomechanisms had been installed in functional positions requiring higher qualification levels, K3 or K3ad. K3 corresponds to seismic requirements, while K3ad involves both seismic and harsh environmental conditions, including radiation environments. Subsequently, EDF conducted checks on related equipment at the Blayais, Chinon, Cruas, Dampierre, Gravelines, Saint-Laurent, and Tricastin nuclear power plants and confirmed that a batch of equipment had model suitability issues.

2026-08-27

France's n-Floating Floating Nuclear Power Project Receives Nearly One Million Euros in Funding

newcleo announced on August 26 that a consortium led by the company has been selected for a call for projects managed by Bpifrance, the French public investment bank, supporting the decarbonization of France's maritime sector. The consortium will advance research on a floating nuclear power solution called n-Floating, with the project receiving nearly one million euros in funding and an expected duration of approximately 18 months. The n-Floating project aims to validate the relevance and technical feasibility of a new floating nuclear power solution. Under the proposed concept, a non-self-propelled floating unit would carry multiple LFR-AS-200 reactors, each with an electrical output of 200 megawatts. LFR-AS-200 is one of the lead-cooled fast reactor technology lines developed by newcleo.

2026-08-27

France Approves Preliminary Works for EPR2 Project at Gravelines Nuclear Power Plant

The French government issued a decree on August 22, local time, approving French utility EDF to launch preliminary preparation works for two EPR2 pressurized water reactors at the Gravelines nuclear power plant, and granting it related environmental permits for site development. The plant currently operates six 900 MW units and is the largest nuclear power station in Western Europe by installed capacity. According to the decree, the approved works include construction of construction platforms and site facilities, relocation of the existing rail terminal, earthworks, foundation reinforcement, construction of waterproof containment structures, and construction access roads. The work also involves relocation of protected flora and fauna, construction of a public information center, and construction of some ancillary parking facilities. EDF said...

2026-08-25

South Korea's DaeChang Solution Secures Special Steel Contract for French Nuclear Power Turbines

South Korean steel casting manufacturer DaeChang Solution Co. announced on August 21 that it has signed a special steel supply contract with Arabelle Solutions France, with the products to be used in steam turbines for small modular reactors (SMRs) and large nuclear power plants. According to the announcement, the contract value is EUR 50.7649 million, equivalent to approximately KRW 82.631 billion based on the initial market exchange rate of KRW 1,627.72 per euro on the contract signing date. This amount represents 138% of DaeChang Solution's 2025 consolidated sales of KRW 59.877 billion. Of the contract value, 70% is a fixed amount, i.e., EUR 37.2055 million...

2026-08-21

Unit 3 of France's Gravelines Nuclear Power Plant Reconnected to Grid, Unit 4 Remains Shut Down

According to EDF on August 18, Unit 3 of the Gravelines Nuclear Power Plant in northern France was reconnected to the national grid at 3:55 a.m. local time on August 18. The unit had been automatically shut down at 7:43 p.m. on August 10 in accordance with established safety protection procedures due to a large influx of jellyfish into the seawater pump station filtration system. The Gravelines Nuclear Power Plant has a total of six units. On August 10, a large number of jellyfish entered the pump station used to draw seawater for cooling nuclear facilities, affecting equipment such as pre-filters and filter drums. In accordance with operating procedures, Units 3 and 4 were automatically shut down; the operating team also shut down Unit 2 and reduced Unit 1's power to 50% to adapt to changing site conditions. Unit 5 was...

2026-08-20

ITER Tokamak Advances Assembly in France, Fusion Experiment Targets 150 Million Degree Celsius Plasma

The ITER tokamak being assembled in southern France is one of the most closely watched large-scale experimental devices in global nuclear fusion research. The machine weighs approximately 23,000 tonnes in total and adopts a donut-shaped toroidal structure, using strong magnetic fields to confine high-temperature plasma, with the goal of replicating on Earth the conditions for fusion reactions that occur inside stars. Its plasma volume is approximately 830 cubic meters, far exceeding previous tokamak devices, and it is therefore expected to validate the key physics and engineering technologies required for future commercial fusion reactors. ITER adopts the toroidal tokamak structure because charged particles can move along toroidal paths under strong magnetic fields, thereby minimizing direct contact with the device's inner walls...

2026-08-14

French heatwave to cut nuclear output by about 15% on Friday

Data from Electricite de France (EDF) shows that due to the fifth heatwave of the European summer, French nuclear power output is expected to fall by about 15% this Friday. At that time, nine reactors are expected to be affected, with total nuclear output reductions reaching 9.4 gigawatts during peak hours, of which six reactors will be completely shut down. This summer, many parts of Europe have experienced sustained high temperatures, with some regions seeing temperatures rise to abnormal levels, triggering issues such as water shortages and wildfires. French meteorological authorities predict that this heatwave will peak on Thursday, with temperatures across most of the country ranging between 35 and 40 degrees Celsius. From Friday, cold air from the west will first affect the Atlantic coast and the English Channel region...

2026-08-14

Heatwave and jellyfish influx into pump stations push French nuclear unit unavailability to 20.4%

The heatwave sweeping across multiple regions of France is impacting the country's electricity production. Several nuclear reactors operated by Électricité de France (EDF) have been shut down or derated due to environmental restrictions or external environmental factors, with the unavailability rate of affected units rising to 20.4% before 10:00 AM on August 12, marking a recent high. Of France's 57 nuclear reactors, 13 are currently affected. Among them, 8 units are fully shut down: Bugey Unit 3, Cattenom Unit 1, Chooz Units 1 and 2, Golfech Unit 2, and Gravelines Units 2, 3, and 4; another 5 units are operating below rated power, including Saint-Alban Unit 2, Tricastin Units 1 and 4...

2026-08-13

Jellyfish Blockage Forces Shutdown of French Nuclear Units; Experts Say Shutdown Demonstrates Effectiveness of Safety Systems

France's Gravelines Nuclear Power Plant recently shut down some of its units again after large numbers of jellyfish entered the water intake system. On August 11, reactors 2, 3, and 4 at the plant were forced to shut down due to blockage in the seawater cooling pump system, reactor 1 was reduced to half power operation, reactor 5 was under maintenance at the time, and only reactor 6 continued normal operation. EDF (Électricité de France) stated that the incident had no impact on nuclear safety, personnel, or the environment, and the affected units would be restarted in phases. Located in northern France, the Gravelines Nuclear Power Plant is one of the largest nuclear power plants in Western Europe. Similar situations have occurred before. In the 20...

2026-08-13

French nuclear fleet output drops to 59% of full capacity

On Wednesday, August 12, French nuclear reactors operated at 59% of full capacity, according to RTÉ grid data and Bloomberg calculations, down 1 percentage point from 60% on Tuesday, August 11. EDF, the world's largest nuclear power operator, currently has 34 reactors in operation with a total available capacity of 33,250 MW; France's 57 nuclear reactors normally supply more than two-thirds of the country's electricity. EDF recently halted power generation at the Gravelines 2 and Bugey 3 reactors, while extending the outage of the Gravelines 3 and 4 units and the Cattenom 4 reactor...

2026-08-13

French heatwave cuts nuclear output, day-ahead power prices surge 22%

A new heatwave in France is hitting its nuclear power supply, with effects quickly transmitting to the electricity market. On Tuesday morning local time, LSEG data showed French day-ahead power prices rose as much as 21.8% to €142.5 per megawatt-hour, equivalent to approximately $164.39. The direct cause of the price surge is that operators expect nuclear output to be constrained during the midday peak demand period on Wednesday. Data from French utility EDF shows that due to this week's heatwave, France's nuclear generation capacity on Wednesday is expected to be reduced by 7.3 gigawatts, equivalent to 12% of total installed capacity. This marks at least the fifth time France has experienced extreme heat since June. For a country where about 70% of electricity comes from nuclear power, nuclear...

2026-08-12

Three units at France's Gravelines nuclear power plant automatically shut down due to jellyfish intrusion

French utility EDF recently stated on its website that three units at the Gravelines nuclear power plant in northern France automatically shut down after a large influx of jellyfish clogged the filtration system, triggering safety measures. The statement indicated that the incident occurred on August 10, 2026. Due to the jellyfish intrusion, three units at the Gravelines plant automatically shut down, while a fourth unit reduced its power output. The plant has a total of six reactors, of which the fifth reactor had already been shut down for planned maintenance, and the sixth reactor remained in operation. The Gravelines plant experienced a similar situation a year earlier, when a large number of jellyfish entered the relevant water intake and filtration systems, causing four reactors to automatically shut down...

2026-08-12

EDF plans to add cooling towers at Golfech nuclear plant to cope with repeated shutdowns due to high temperatures

French utility EDF is planning to adapt the Golfech nuclear power plant in Tarn-et-Garonne to cope with increasingly frequent heatwaves. Since June this year, the plant has been shut down multiple times due to high temperatures, with another outage in early August, highlighting the growing operational pressure on nuclear facilities that rely on river water for cooling in the context of climate change. The direct cause of the Golfech shutdowns is not that the reactors themselves cannot operate, but rather that the Garonne River water temperature is too high. Under regulations dating from 2006, when the daily average water temperature of the Garonne downstream of the plant exceeds 28 degrees Celsius, EDF may reduce unit output or temporarily shut down. This restriction is primarily intended to protect the river ecosystem...

2026-08-11

French nuclear power sets record unavailability rate due to high temperatures and drought, one-sixth of capacity constrained

France's nuclear power system is under exceptional strain. Affected by persistent high temperatures and low river water levels, nuclear reactors operated by French utility EDF have recorded unprecedented unavailability. According to an AFP tally based on data published by EDF since 2015, on the afternoon of Sunday, August 9, 2026, the nuclear capacity shortfall caused by drought and extreme heat reached 15.6% of installed capacity, equivalent to roughly one-sixth of France's nuclear power capacity being temporarily unable to supply electricity normally. The cause of this disruption is not simply equipment failure, but is closely linked to the natural environment on which nuclear plant operations depend. Many nuclear plants draw water from rivers for cooling; when river levels are too low or water temperatures too high, the...

2026-08-11

After only 4 days of restart, Unit 2 of France's Golfech Nuclear Power Plant shut down again due to Garonne River water temperature approaching limit

On the evening of August 8, French utility EDF (Électricité de France) once again shut down Unit 2 of the Golfech Nuclear Power Plant, just four days after the unit had been restarted. The direct cause of this shutdown was that the water temperature of the Garonne River was expected to reach 28°C on August 9, hitting the local operational limit. Since Unit 1 had already been taken offline for maintenance and fuel replacement, the closure of Unit 2 left both reactors at the Golfech plant simultaneously out of service, with the station temporarily ceasing power generation. Located in the Tarn-et-Garonne department of France, the Golfech Nuclear Power Plant was commissioned between 1991 and 1994, and features two 1,300 MW pressurized water reactor units. It draws cooling water from the Garonne River and dissipates heat through natural-draft cooling towers. According to EDF dat...

2026-08-10