Company lists · Data refreshed September 2026

Top 25 Nuclear facility engineering firms based in France

Name: Nuclear facility engineering firms based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 120 companies tracked

RevenueBase identified 120 nuclear facility engineering firms headquartered in France as of September 2026 and tracks 35,850 professional contacts across them, including 14,776 with verified work emails. Paris is the largest hub.

This list covers nuclear facility engineering firms headquartered in France, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

120Companies

35,850Contacts tracked

14,776Verified emails

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The 25 largest nuclear facility engineering firms based in France

Ranked by team size

Top 25 of 120 nuclear facility engineering firms based in France, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to nuclear facility engineering firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Framatome	Partial evidence	Courbevoie, FranceHQ checked Sep 17, 2026	10001+	12,439 contacts →
	Partial evidence “Framatome is an international leader in nuclear energy recognized for its innovative, digital and value added solutions for the global nuclear fleet.” Source: RevenueBase Database · checked Sep 17, 2026
2	Assystem	Strong evidence	Courbevoie, FranceHQ checked Sep 17, 2026	5,001-10,000	6,518 contacts →
	Strong evidence “Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition.” Source: RevenueBase Database · checked Sep 17, 2026
3	Edvance	Partial evidence	Montrouge, FranceHQ checked Sep 17, 2026	1,001-5,000	1,780 contacts →
	Partial evidence “Edvance, a joint subsidiary of EDF and Framatome, is responsible for the design and implementation (studies, procurement assistance, assembly and commissioning) of nuclear islands…” Source: RevenueBase Database · checked Sep 17, 2026
4	Orano DS	Indirect evidence	Massy, FranceHQ checked Sep 17, 2026	5,001-10,000	1,684 contacts →
	Indirect evidence “Orano DS fait partie du Groupe Orano, le fournisseur de référence du cycle du combustible nucléaire.” Source: RevenueBase Database · checked Sep 17, 2026
5	Onet Technologies	Strong evidence	Marseille, FranceHQ checked Sep 17, 2026	1,001-5,000	1,664 contacts →
	Strong evidence “Onet Technologies has 40 years of experience in the nuclear industry, with a strong expertise in engineering and services for reactor maintenance; dismantling, decommissioning and…” Source: RevenueBase Database · checked Sep 17, 2026
6	NUVIA	Indirect evidence	Rueil Malmaison, FranceHQ checked Sep 17, 2026	1,001-5,000	1,537 contacts →
	Indirect evidence “Subsidiary of the world-leading VINCI group, NUVIA is an international company that has been operating on highly regulated and sensitive industrial sites for over 60 years.” Source: RevenueBase Database · checked Sep 17, 2026
7	EKIUM	Indirect evidence	Lyon Cedex 07, FranceHQ checked Sep 17, 2026	1,001-5,000	1,502 contacts →
	Indirect evidence “Welcome to Ekium!” Source: RevenueBase Database · checked Sep 17, 2026
8	Technicatome	Indirect evidence	Villiers-le-bâcle, FranceHQ checked Sep 17, 2026	1,001-5,000	1,315 contacts →
	Indirect evidence “TechnicAtome est spécialisée, depuis plus de 50 ans, dans la conception, la réalisation, la mise en service et le maintien en conditions opérationnelles des réacteurs nucléaires…” Source: RevenueBase Database · checked Sep 17, 2026
9	Spie Nucléaire	Indirect evidence	Cergy-pontoise Cedex, FranceHQ checked Sep 17, 2026	1,001-5,000	1,079 contacts →
	Indirect evidence “À propos de SPIE Nucléaire Filiale de SPIE France, SPIE Nucléaire est le partenaire de référence multi-technique dans la conception, la réalisation, les travaux de modification…” Source: RevenueBase Database · checked Sep 17, 2026
10	Dalkia EN	Indirect evidence	Courbevoie, FranceHQ checked Sep 17, 2026	501-1,000	485 contacts →
	Indirect evidence “Sur les centrales nucléaires du groupe EDF, nous intervenons sur tous les types de bâtiments, à la fois de production et tertiaires.” Source: RevenueBase Database · checked Sep 17, 2026
11	Ardatem	Indirect evidence	Bourg Saint Andéol, FranceHQ checked Sep 17, 2026	501-1,000	406 contacts →
	Indirect evidence “Installation & Maintenance \| Études, Ingénierie & Prestations Intellectuelles.” Source: RevenueBase Database · checked Sep 17, 2026
12	Bilfinger Nuclear	Partial evidence	Montrouge, FranceHQ checked Sep 17, 2026	1,001-5,000	211 contacts →
	Partial evidence “Partner for the nuclear industry Bilfinger has successfully supported and advised customers from the nuclear industry for decades.” Source: RevenueBase Database · checked Sep 17, 2026
13	Alcadia Entreprises	Indirect evidence	Lyon, FranceHQ checked Sep 17, 2026	51-200	166 contacts →
	Indirect evidence “Alcadia est une entreprise de conseil en ingénierie spécialisée dans les domaines technologiques à forte valeur ajoutée.” Source: RevenueBase Database · checked Sep 17, 2026
14	ECIA	Indirect evidence	Bagnols Sur Ceze, FranceHQ checked Sep 17, 2026	201-500	163 contacts →
	Indirect evidence “Société d’ingénierie, ECIA, une marque d'Equans, est un acteur de la filière nucléaire dans le domaine de la maîtrise des risques.” Source: RevenueBase Database · checked Sep 17, 2026
15	Robatel	Partial evidence	Genas, FranceHQ checked Sep 17, 2026	51-200	95 contacts →
	Partial evidence “ROBATEL is a French company specialising in the design, manufacture and maintenance of mechanically welded equipment for the nuclear industry.” Source: RevenueBase Database · checked Sep 17, 2026
16	Csti Groupe	Indirect evidence	Peyrolles-en-provence, FranceHQ checked Sep 17, 2026	51-200	78 contacts →
	Indirect evidence “Depuis 35 ans CSTI INDUSTRIE, est spécialiste des projets « clé en main » dans le domaine du nucléaire.” Source: RevenueBase Database · checked Sep 17, 2026
17	Tunzini Maintenance Nucléaire	Indirect evidence	Lyon, FranceHQ checked Sep 17, 2026	51-200	73 contacts →
	Indirect evidence “TUNZINI Maintenance Nucléaire intervient lors des opérations d’arrêts de tranche pour la réalisation des travaux mécaniques et de manutention de gros composants en bâtiments…” Source: RevenueBase Database · checked Sep 17, 2026
18	Graphitech Nuclear	Strong evidence	Lyon, FranceHQ checked Sep 17, 2026	11-50	60 contacts →
	Strong evidence “Graphitech is an engineering company in charge of technological development and engineering studies required in preparation for decommissioning nuclear reactors that use graphite…” Source: RevenueBase Database · checked Sep 17, 2026
19	Bouygues Construction Purchasing	Indirect evidence	Guyancourt, FranceHQ checked Sep 17, 2026	201-500	55 contacts →
	Indirect evidence “BOUYGUES CONSTRUCTION PURCHASING is a company based out of 1 AV EUGENE FREYSSINET, Guyancourt, France.” Source: RevenueBase Database · checked Sep 17, 2026
20	Setec Nucléaire	Indirect evidence	Paris Cedex 12, FranceHQ checked Sep 17, 2026	201-500	50 contacts →
	Indirect evidence “Pour répondre à la demande énergétique croissante dans le monde, setec nucléaire accompagne les acteurs du nucléaire dans le développement de leurs projets.” Source: RevenueBase Database · checked Sep 17, 2026
21	Oakridge SAS	Partial evidence	Orleans, FranceHQ checked Sep 17, 2026	51-200	50 contacts →
	Partial evidence “As a privately owned Consulting company, OAKRIDGE SAS is committed to advising Nuclear projects' leaders worldwide, with no conflict of interest.” Source: RevenueBase Database · checked Sep 17, 2026
22	Kury Ingénierie	Indirect evidence	Clamart, FranceHQ checked Sep 17, 2026	51-200	45 contacts →
	Indirect evidence “Crée en KURY Ingénierie est un bureau d'études spécialisé dans la conception et la sûreté nucléaire.” Source: RevenueBase Database · checked Sep 17, 2026
23	DE Viris	Indirect evidence	Aix-en-provence, FranceHQ checked Sep 17, 2026	51-200	31 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
24	Taranis Solutions	Indirect evidence	Pierrelatte, FranceHQ checked Sep 17, 2026	51-200	25 contacts →
	Indirect evidence “Taranis solutions est une filiale du Groupe PONTICELLI.” Source: RevenueBase Database · checked Sep 17, 2026
25	Nucadvisor	Partial evidence	Puteaux, FranceHQ checked Sep 17, 2026	11-50	22 contacts →
	Partial evidence “NucAdvisor is a nuclear consulting company established in France by a group of senior executives and high-level experts from across the European nuclear industry.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: nuclear facility engineering firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names nuclear facility engineering firms.
Partial evidence: Its own public description names part of nuclear facility engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name nuclear facility engineering firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 120 nuclear facility engineering firms based in France

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Nuclear facility engineering firms based in France at a glance

As of Sep 17, 2026

41.2%Verified-email coverage

298.8Average contacts per company

11-50Median size (employees)

7.5%Largest-city concentration · Paris

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for France, so it is reported there. Company counts and contact totals on this page are exact for France, over 120 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among nuclear facility engineering firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in France whose own description of what they do matches “nuclear facility engineering firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names nuclear facility engineering firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among nuclear facility engineering firms, and records with no verified work email. Companies headquartered outside France are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 14,776 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names nuclear facility engineering firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many nuclear facility engineering firms are there based in France?

RevenueBase identified 120 nuclear facility engineering firms headquartered in France as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Framatome, headquartered in Courbevoie, tops this list with the largest team on record.

Which city has the most nuclear facility engineering firms?

Paris leads with 9 headquartered companies, followed by Lyon (8) and Pierrelatte (5).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 14,776 verified decision-maker contacts tracked across these 120 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.