France: Constitutional Council validates merger between ASN and IRSN

The French Constitutional Council rejects the appeal against the ASN-IRSN merger, paving the way for the creation of a new nuclear safety authority in 2025.

Share:

Comprehensive energy news coverage, updated nonstop

Annual subscription

8.25€/month*

*billed annually at 99€/year for the first year then 149,00€/year ​

Unlimited access • Archives included • Professional invoice

OTHER ACCESS OPTIONS

Monthly subscription

Unlimited access • Archives included

5.2€/month*
then 14.90€ per month thereafter

FREE ACCOUNT

3 articles offered per month

FREE

*Prices are excluding VAT, which may vary depending on your location or professional status

Since 2021: 35,000 articles • 150+ analyses per week

The French Constitutional Council has rejected an appeal by left-wing MPs and Liot independents against the merger of the ASN (Autorité de sûreté nucléaire) and IRSN (Institut de radioprotection et de sûreté nucléaire). This bill, adopted by the French Parliament in early April, provides for the creation of an ASNR (Nuclear Safety and Radiation Protection Authority) in 2025. The French Constitutional Council ruled that this merger did not contravene the French Environment Charter.

Government objectives

The government defends this merger as a means of streamlining the nuclear sector by reducing the time required for expert appraisal and authorization of facilities. The ASNR will bring together some 2,270 employees from the two current organizations. The aim of this reorganization is to simplify administrative processes and improve the efficiency of nuclear sector regulation in France.

Opponents’ arguments

Opponents, made up of four left-wing groups in the National Assembly and Liot’s independents, fear a loss of expert independence and increased opacity in the decision-making process. They believe that the merger of the two entities calls into question France’s historic dual organization and its deterministic approach to nuclear safety, protected by the French Environment Charter.

Response from the Conseil constitutionnel

In its decision, the French Constitutional Council affirmed that the merger would not affect the obligations to which civil nuclear activities are subject. He also pointed out that the law requires a distinction to be made between expert and decision-makers, thus ensuring the neutrality and independence needed to regulate the sector.

Reactions and consequences

Following this decision, IRSN’s trade unions urgently requested the appointment of a neutral figure to steer the merger with ASN. This request underlines the unions’ continuing concerns about the independence and effectiveness of the new authority. The implementation of this merger in 2025 will mark a significant milestone in the regulation of the nuclear sector in France, with important implications for safety and environmental protection.
The Constitutional Council’s approval of the ASN-IRSN merger paves the way for a new era of nuclear regulation in France. The success of this reorganization will depend on the ASNR’s ability to maintain the independence and efficiency required to guarantee nuclear safety and environmental protection.

NexGen Energy has opened Canadian Nuclear Safety Commission hearings for the final approval of its Rook I uranium project, following more than six years of regulatory process.
Oklo has signed a binding agreement with Siemens Energy to accelerate manufacturing of the energy conversion system for its first advanced nuclear power plant in the United States.
A security document handling incident at the nuclear power plant renews concerns about TEPCO as a key decision on restarting reactors 6 and 7 approaches in Niigata.
An initial civil nuclear cooperation agreement was signed between the United States and Saudi Arabia, prompting calls from the US Congress for strict safeguards to prevent a Middle East arms race.
The launch of the Zhaoyuan nuclear project anchors the Hualong One model inland, illustrating Beijing’s strategy of regulatory normalisation in response to Western technological restrictions.
TRISO-X has started above-ground works on the first U.S. facility dedicated to manufacturing fuel for small modular reactors, marking a key industrial milestone in the deployment of the Xe-100.
The first Russian test rig for the experimental ITER reactor has been delivered to the site in France, marking a major milestone in the international collaboration on nuclear fusion.
A strategic report reveals the industrial and energy potential of Allseas’ offshore small modular reactor, which could create up to 40,000 jobs and reduce investment in the power grid.
Niigata’s governor is expected to approve the restart of one reactor at the Kashiwazaki-Kariwa plant, inactive since the Fukushima accident, reviving a strategic asset for Japan’s energy sector.
Canadian firm Aecon and private developer Norsk Kjernekraft have signed a strategic agreement targeting the deployment of BWRX-300 small modular reactors across several potential locations in Norway.
The South African government has officially lifted the PBMR reactor out of inactivity, launching a public investment programme and transferring the strategic nuclear asset from Eskom to Necsa.
The French Court of Auditors values EDF’s grand carénage at over €100bn, while EPR2 reactors already exceed €67–75bn. The State simultaneously directs regulation, financing, and industrial strategy, raising the risk of conflict of interest.
Belarus commits major public investment to add a third reactor at the Ostrovets plant and initiates studies for a second nuclear site to support national energy demand.
Framatome’s accident-tolerant fuel prototype has completed a second 24-month cycle in a commercial nuclear reactor in the United States, paving the way for a third phase of industrial testing.
The Wylfa site in Wales will host three Rolls-Royce small modular reactors from 2026, marking a strategic investment in the UK’s nuclear expansion.
EDF confirmed that the Flamanville EPR has reached a major milestone, while planning a nearly year-long shutdown in 2026 for extensive regulatory inspections and key component replacement.
EDF is opening access to its long-term nuclear supply contracts to companies consuming more than 7 GWh per year, an adjustment driven by the gradual end of the Arenh mechanism.
South Korean authorities have approved the continued operation of the Kori 2 reactor for an additional eight years, marking a key milestone in the national nuclear strategy.
A public-private consortium is developing a 5 MW thermal microreactor designed to operate without refuelling for ten years, marking a strategic step in Brazil's nuclear innovation efforts.
EDF has announced that the Flamanville EPR reactor is now operating at 80% of its capacity. The target of reaching full output by the end of autumn remains confirmed by the utility.

All the latest energy news, all the time

Annual subscription

8.25€/month*

*billed annually at 99€/year for the first year then 149,00€/year ​

Unlimited access - Archives included - Pro invoice

Monthly subscription

Unlimited access • Archives included

5.2€/month*
then 14.90€ per month thereafter

*Prices shown are exclusive of VAT, which may vary according to your location or professional status.

Since 2021: 30,000 articles - +150 analyses/week.