Company lists · Data refreshed November 2026
Top 25 Nuclear reactor design companies worldwide
RevenueBase identified 384 company matches for nuclear reactor design companies worldwide as of November 2026 and tracks 70,175 professional contacts across them, including 17,662 with verified work emails. The United States is the largest market and New York the largest hub.
This list covers company matches for nuclear reactor design companies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 5, 2026. Country and city lists for nuclear reactor design companies follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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.
The 25 largest nuclear reactor design companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 13,401 contacts → | ||||
Exact match “Framatome is an international leader in nuclear energy recognized for its innovative, digital and value added solutions for the global nuclear fleet.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 2 | 11,794 contacts → | ||||
Exact match “Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 3 | 6,903 contacts → | ||||
Exact match “Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 4 | 4,060 contacts → | ||||
Exact match “At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 5 | 2,270 contacts → | ||||
Exact match “Canada's premier nuclear science and technology organization.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 6 | 1,864 contacts → | ||||
Exact match “Edvance, a joint subsidiary of EDF and Framatome, is responsible for the design and implementation (studies, procurement assistance, assembly and commissioning) of nuclear islands…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 7 | 1,285 contacts → | ||||
Exact match “EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 8 | 1,242 contacts → | ||||
Exact match “At X-energy, we design and deploy transformative technology to fuel the future of humanity, leveraging decades of expertise in high-temperature gas-cooled reactor and TRISO fuel…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 9 | 1,227 contacts → | ||||
Exact match “Holtec International is a global turnkey supplier of equipment and services for the Nuclear, Solar, Geothermal, and Fossil Power Generation sectors of the energy and petrochemical…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 10 | 1,093 contacts → | ||||
Exact match “Our Canadian-made, CANDU® reactors supply approximately 50% of Ontario’s electricity and 16% of Canada’s overall electricity requirements.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 11 | 1,011 contacts → | ||||
Exact match “TerraPower is a leading nuclear innovation company that strives to improve the world through nuclear energy and science.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 12 | 633 contacts → | ||||
Exact match “newcleo is an innovative nuclear technology company developing advanced modular reactors and nuclear fuel designed to deliver clean, safe and sustainable energy at competitive…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 13 | 603 contacts → | ||||
Exact match “KEPCO E&C was founded in 1975 with the objective of obtaining core technology.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 14 | 543 contacts → | ||||
Exact match “NuScale has designed a new kind of nuclear power plant that is smarter, safer, cleaner, and more cost competitive than the large gigawatt nuclear power plants of the past.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 15 | 515 contacts → | ||||
Exact match “Kairos Power has a mission to enable the world’s clean energy transition to improve people’s quality of life while protecting the environment.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 16 | 484 contacts → | ||||
Exact match “TECNATOM was set up in 1957 as a Spanish engineering company specialising in guaranteeing the operation and maintenance of nuclear power plants to the highest levels of safety.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 17 | 451 contacts → | ||||
Exact match “GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 18 | 417 contacts → | ||||
Exact match “The joint stock company ÚJV Řež is building on the six decades of experience of its predecessor – the Nuclear Research Institute (NRI).” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 19 | 378 contacts → | ||||
Exact match “Se ocupa de la primera parte del ciclo de combustible nuclear (diseño, fabricación y abastecimiento de combustible) prestando servicios de ingeniería y combustible a las Centrales…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 20 | 334 contacts → | ||||
Exact match “Oklo's mission is to provide clean, reliable, affordable energy through the deployment of next-generation fast fission technology and recycling nuclear waste.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 21 | 307 contacts → | ||||
Exact match “We support our clients by delivering safe, practical and efficient solutions to complex nuclear challenges, with a strong focus on disposability.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 22 | 278 contacts → | ||||
Exact match “Radiant is building the world’s first mass-produced portable nuclear microreactors.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 23 | 264 contacts → | ||||
Exact match “Fabricación de componentes para la industria nuclear.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 24 | 252 contacts → | ||||
Exact match “Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
| 25 | 230 contacts → | ||||
Exact match “ŠKODA JS a.s.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “nuclear reactor design companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 384 nuclear reactor design companies worldwide
See the full list, filter by size, metro and specialty, and access 17,662 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Nuclear reactor design companies worldwide at a glance
As of Nov 5, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for nuclear reactor design companies are linked below.
- What qualifies
- Company records worldwide whose business descriptions match “nuclear reactor design companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- 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 displayed company carries at least one verified work email. RevenueBase tracks 17,662 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Nuclear reactor design companies by location
2 lists · largest firstEvery Nuclear reactor design companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “nuclear reactor design companies”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many nuclear reactor design companies are there worldwide?
RevenueBase identified 384 company matches for nuclear reactor design companies worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Framatome tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which country has the most nuclear reactor design companies?
The United States leads with 126 companies, followed by France (27). Every nuclear reactor design companies list by country and city is linked on this page.
Which city has the most nuclear reactor design companies?
New York leads with 6 company records, followed by Austin (4) and Lyon (4).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 17,662 professional contacts with verified work emails tracked across these 384 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 2026.
Ready to reach these companies? Verified emails and direct dials for all 384 nuclear reactor design companies worldwide. Start with a free account, no credit card.
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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 SmartSearch, 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.
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Company intelligence · public preview
Top 25 nuclear reactor design companies worldwide
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 384 matching company records for nuclear reactor design companies worldwide, with 70,175 tracked contacts and 17,662 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 5, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 nuclear reactor design companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Framatomeframatome.comHQ: Courbevoie, FranceReported employees: 10001+ | Courbevoie, France | 10001+ | Exact match | 13,401 contacts → |
“Framatome is an international leader in nuclear energy recognized for its innovative, digital and value added solutions for the global nuclear fleet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Westinghouse Electric Companywestinghousenuclear.comHQ: Cranberry Township, PA, United StatesReported employees: 5,001-10,000 | Cranberry Township, PA, United States | 5,001-10,000 | Exact match | 11,794 contacts → |
“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Assystemassystem.comHQ: Courbevoie, FranceReported employees: 5,001-10,000 | Courbevoie, France | 5,001-10,000 | Exact match | 6,903 contacts → |
“Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  BWXTbwxt.comHQ: Lynchburg, VA, United StatesReported employees: 5,001-10,000 | Lynchburg, VA, United States | 5,001-10,000 | Exact match | 4,060 contacts → |
“At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Chalk River, ON, CanadaReported employees: 1,001-5,000 | Chalk River, ON, Canada | 1,001-5,000 | Exact match | 2,270 contacts → |
“Canada's premier nuclear science and technology organization.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  Edvanceedvance.frHQ: Montrouge, FranceReported employees: 1,001-5,000 | Montrouge, France | 1,001-5,000 | Exact match | 1,864 contacts → |
“Edvance, a joint subsidiary of EDF and Framatome, is responsible for the design and implementation (studies, procurement assistance, assembly and commissioning) of nuclear islands…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 |  Energysolutionsenergysolutions.comHQ: Salt Lake City, UT, United StatesReported employees: 1,001-5,000 | Salt Lake City, UT, United States | 1,001-5,000 | Exact match | 1,285 contacts → |
“EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  X-Energyx-energy.comHQ: Rockville, MD, United StatesReported employees: 501-1,000 | Rockville, MD, United States | 501-1,000 | Exact match | 1,242 contacts → |
“At X-energy, we design and deploy transformative technology to fuel the future of humanity, leveraging decades of expertise in high-temperature gas-cooled reactor and TRISO fuel…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Holtec Internationalholtecinternational.comHQ: Jupiter, FL, United StatesReported employees: 501-1,000 | Jupiter, FL, United States | 501-1,000 | Exact match | 1,227 contacts → |
“Holtec International is a global turnkey supplier of equipment and services for the Nuclear, Solar, Geothermal, and Fossil Power Generation sectors of the energy and petrochemical…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Candu Energy INCatkinsrealis.comHQ: Mississauga, ON, CanadaReported employees: 1,001-5,000 | Mississauga, ON, Canada | 1,001-5,000 | Exact match | 1,093 contacts → |
“Our Canadian-made, CANDU® reactors supply approximately 50% of Ontario’s electricity and 16% of Canada’s overall electricity requirements.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  Terrapowerterrapower.comHQ: Bellevue, WA, United StatesReported employees: 501-1,000 | Bellevue, WA, United States | 501-1,000 | Exact match | 1,011 contacts → |
“TerraPower is a leading nuclear innovation company that strives to improve the world through nuclear energy and science.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Newcleonewcleo.comHQ: Paris, FranceReported employees: 501-1,000 | Paris, France | 501-1,000 | Exact match | 633 contacts → |
“newcleo is an innovative nuclear technology company developing advanced modular reactors and nuclear fuel designed to deliver clean, safe and sustainable energy at competitive…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Kepco E&ckepco-enc.comHQ: Port Elgin, CanadaReported employees: 1,001-5,000 | Port Elgin, Canada | 1,001-5,000 | Exact match | 603 contacts → |
“KEPCO E&C was founded in 1975 with the objective of obtaining core technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Nuscale Powernuscalepower.comHQ: Corvallis, WA, United StatesReported employees: 201-500 | Corvallis, WA, United States | 201-500 | Exact match | 543 contacts → |
“NuScale has designed a new kind of nuclear power plant that is smarter, safer, cleaner, and more cost competitive than the large gigawatt nuclear power plants of the past.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Kairos Powerkairospower.comHQ: Alameda, CA, United StatesReported employees: 501-1,000 | Alameda, CA, United States | 501-1,000 | Exact match | 515 contacts → |
“Kairos Power has a mission to enable the world’s clean energy transition to improve people’s quality of life while protecting the environment.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Tecnatomtecnatom.esHQ: San Sebastian De Los Reyes, SpainReported employees: 501-1,000 | San Sebastian De Los Reyes, Spain | 501-1,000 | Exact match | 484 contacts → |
“TECNATOM was set up in 1957 as a Spanish engineering company specialising in guaranteeing the operation and maintenance of nuclear power plants to the highest levels of safety.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  GSE Solutionsgses.comHQ: Columbia, MD, United StatesReported employees: 201-500 | Columbia, MD, United States | 201-500 | Exact match | 451 contacts → |
“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | HQ: Husinec-řež, Czech RepublicReported employees: 501-1,000 | Husinec-řež, Czech Republic | 501-1,000 | Exact match | 417 contacts → |
“The joint stock company ÚJV Řež is building on the six decades of experience of its predecessor – the Nuclear Research Institute (NRI).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | HQ: Madrid, SpainReported employees: 501-1,000 | Madrid, Spain | 501-1,000 | Exact match | 378 contacts → |
“Se ocupa de la primera parte del ciclo de combustible nuclear (diseño, fabricación y abastecimiento de combustible) prestando servicios de ingeniería y combustible a las Centrales…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 |  Oklo INCoklo.comHQ: Santa Clara, United StatesReported employees: 51-200 | Santa Clara, United States | 51-200 | Exact match | 334 contacts → |
“Oklo's mission is to provide clean, reliable, affordable energy through the deployment of next-generation fast fission technology and recycling nuclear waste.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  NSG Environmental LTDnsgltd.comHQ: Chorley, United KingdomReported employees: 501-1,000 | Chorley, United Kingdom | 501-1,000 | Exact match | 307 contacts → |
“We support our clients by delivering safe, practical and efficient solutions to complex nuclear challenges, with a strong focus on disposability.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  Radiantradiantnuclear.comHQ: El Segundo, CA, United StatesReported employees: 51-200 | El Segundo, CA, United States | 51-200 | Exact match | 278 contacts → |
“Radiant is building the world’s first mass-produced portable nuclear microreactors.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | HQ: Maliaño, SpainReported employees: 201-500 | Maliaño, Spain | 201-500 | Exact match | 264 contacts → |
“Fabricación de componentes para la industria nuclear.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  Paragon Energy Solutionsparagones.comHQ: Fort Worth, TX, United StatesReported employees: 201-500 | Fort Worth, TX, United States | 201-500 | Exact match | 252 contacts → |
“Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Škoda JSskoda-js.czHQ: Bolevec, Czech RepublicReported employees: 1,001-5,000 | Bolevec, Czech Republic | 1,001-5,000 | Exact match | 230 contacts → |
“ŠKODA JS a.s.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 384 company matches
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Nuclear reactor design companies: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
383 records in the displayed employee bands.
1 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 384 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 5, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Nuclear reactor design companies by location
2 lists · largest firstEvery Nuclear reactor design companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for nuclear reactor design companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many nuclear reactor design companies did RevenueBase find worldwide?
The saved snapshot records 384 matching company records, 70,175 tracked contacts and 17,662 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 5, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 nuclear reactor design companies worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/nuclear-reactor-design-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
Company intelligence · public preview
Top 25 nuclear reactor design companies worldwide
RevenueBase records 384 matching company records for nuclear reactor design companies worldwide, with 70,175 tracked contacts and 17,662 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: November 5, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 nuclear reactor design companies worldwide
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Framatomeframatome.com HQ: Courbevoie, FranceReported employees: 10001+ | Courbevoie, France | 10001+ | Exact match | 13,401 contacts → |
“Framatome is an international leader in nuclear energy recognized for its innovative, digital and value added solutions for the global nuclear fleet.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Westinghouse Electric Companywestinghousenuclear.com HQ: Cranberry Township, PA, United StatesReported employees: 5,001-10,000 | Cranberry Township, PA, United States | 5,001-10,000 | Exact match | 11,794 contacts → |
“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Assystemassystem.com HQ: Courbevoie, FranceReported employees: 5,001-10,000 | Courbevoie, France | 5,001-10,000 | Exact match | 6,903 contacts → |
“Assystem, one of the world's leading independent nuclear engineering companies, is committed to accelerating the energy transition.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | BWXTbwxt.com HQ: Lynchburg, VA, United StatesReported employees: 5,001-10,000 | Lynchburg, VA, United States | 5,001-10,000 | Exact match | 4,060 contacts → |
“At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | HQ: Chalk River, ON, CanadaReported employees: 1,001-5,000 | Chalk River, ON, Canada | 1,001-5,000 | Exact match | 2,270 contacts → |
“Canada's premier nuclear science and technology organization.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | Edvanceedvance.fr HQ: Montrouge, FranceReported employees: 1,001-5,000 | Montrouge, France | 1,001-5,000 | Exact match | 1,864 contacts → |
“Edvance, a joint subsidiary of EDF and Framatome, is responsible for the design and implementation (studies, procurement assistance, assembly and commissioning) of nuclear islands…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Energysolutionsenergysolutions.com HQ: Salt Lake City, UT, United StatesReported employees: 1,001-5,000 | Salt Lake City, UT, United States | 1,001-5,000 | Exact match | 1,285 contacts → |
“EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | X-Energyx-energy.com HQ: Rockville, MD, United StatesReported employees: 501-1,000 | Rockville, MD, United States | 501-1,000 | Exact match | 1,242 contacts → |
“At X-energy, we design and deploy transformative technology to fuel the future of humanity, leveraging decades of expertise in high-temperature gas-cooled reactor and TRISO fuel…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Holtec Internationalholtecinternational.com HQ: Jupiter, FL, United StatesReported employees: 501-1,000 | Jupiter, FL, United States | 501-1,000 | Exact match | 1,227 contacts → |
“Holtec International is a global turnkey supplier of equipment and services for the Nuclear, Solar, Geothermal, and Fossil Power Generation sectors of the energy and petrochemical…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Candu Energy INCatkinsrealis.com HQ: Mississauga, ON, CanadaReported employees: 1,001-5,000 | Mississauga, ON, Canada | 1,001-5,000 | Exact match | 1,093 contacts → |
“Our Canadian-made, CANDU® reactors supply approximately 50% of Ontario’s electricity and 16% of Canada’s overall electricity requirements.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | Terrapowerterrapower.com HQ: Bellevue, WA, United StatesReported employees: 501-1,000 | Bellevue, WA, United States | 501-1,000 | Exact match | 1,011 contacts → |
“TerraPower is a leading nuclear innovation company that strives to improve the world through nuclear energy and science.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Newcleonewcleo.com HQ: Paris, FranceReported employees: 501-1,000 | Paris, France | 501-1,000 | Exact match | 633 contacts → |
“newcleo is an innovative nuclear technology company developing advanced modular reactors and nuclear fuel designed to deliver clean, safe and sustainable energy at competitive…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Kepco E&ckepco-enc.com HQ: Port Elgin, CanadaReported employees: 1,001-5,000 | Port Elgin, Canada | 1,001-5,000 | Exact match | 603 contacts → |
“KEPCO E&C was founded in 1975 with the objective of obtaining core technology.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Nuscale Powernuscalepower.com HQ: Corvallis, WA, United StatesReported employees: 201-500 | Corvallis, WA, United States | 201-500 | Exact match | 543 contacts → |
“NuScale has designed a new kind of nuclear power plant that is smarter, safer, cleaner, and more cost competitive than the large gigawatt nuclear power plants of the past.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Kairos Powerkairospower.com HQ: Alameda, CA, United StatesReported employees: 501-1,000 | Alameda, CA, United States | 501-1,000 | Exact match | 515 contacts → |
“Kairos Power has a mission to enable the world’s clean energy transition to improve people’s quality of life while protecting the environment.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Tecnatomtecnatom.es HQ: San Sebastian De Los Reyes, SpainReported employees: 501-1,000 | San Sebastian De Los Reyes, Spain | 501-1,000 | Exact match | 484 contacts → |
“TECNATOM was set up in 1957 as a Spanish engineering company specialising in guaranteeing the operation and maintenance of nuclear power plants to the highest levels of safety.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | GSE Solutionsgses.com HQ: Columbia, MD, United StatesReported employees: 201-500 | Columbia, MD, United States | 201-500 | Exact match | 451 contacts → |
“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | HQ: Husinec-řež, Czech RepublicReported employees: 501-1,000 | Husinec-řež, Czech Republic | 501-1,000 | Exact match | 417 contacts → |
“The joint stock company ÚJV Řež is building on the six decades of experience of its predecessor – the Nuclear Research Institute (NRI).” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | HQ: Madrid, SpainReported employees: 501-1,000 | Madrid, Spain | 501-1,000 | Exact match | 378 contacts → |
“Se ocupa de la primera parte del ciclo de combustible nuclear (diseño, fabricación y abastecimiento de combustible) prestando servicios de ingeniería y combustible a las Centrales…” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Oklo INCoklo.com HQ: Santa Clara, United StatesReported employees: 51-200 | Santa Clara, United States | 51-200 | Exact match | 334 contacts → |
“Oklo's mission is to provide clean, reliable, affordable energy through the deployment of next-generation fast fission technology and recycling nuclear waste.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | NSG Environmental LTDnsgltd.com HQ: Chorley, United KingdomReported employees: 501-1,000 | Chorley, United Kingdom | 501-1,000 | Exact match | 307 contacts → |
“We support our clients by delivering safe, practical and efficient solutions to complex nuclear challenges, with a strong focus on disposability.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | Radiantradiantnuclear.com HQ: El Segundo, CA, United StatesReported employees: 51-200 | El Segundo, CA, United States | 51-200 | Exact match | 278 contacts → |
“Radiant is building the world’s first mass-produced portable nuclear microreactors.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | HQ: Maliaño, SpainReported employees: 201-500 | Maliaño, Spain | 201-500 | Exact match | 264 contacts → |
“Fabricación de componentes para la industria nuclear.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | Paragon Energy Solutionsparagones.com HQ: Fort Worth, TX, United StatesReported employees: 201-500 | Fort Worth, TX, United States | 201-500 | Exact match | 252 contacts → |
“Paragon tackles the most difficult challenges of the nuclear industry-those faced by the current operating fleet as well as the next generation of advanced reactors.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Škoda JSskoda-js.cz HQ: Bolevec, Czech RepublicReported employees: 1,001-5,000 | Bolevec, Czech Republic | 1,001-5,000 | Exact match | 230 contacts → |
“ŠKODA JS a.s.” Recorded description excerpt · November 5, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 384 company matches
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Nuclear reactor design companies: dataset insights
November 5, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
383 records in the displayed employee bands.
1 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured across the whole country list rather than for Worldwide, so it is reported there. Company counts and contact totals on this page are exact for Worldwide, over 384 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: November 5, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Nuclear reactor design companies by location
2 lists · largest firstEvery Nuclear reactor design companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Questions about this company list
What does Exact match mean for nuclear reactor design companies?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many nuclear reactor design companies did RevenueBase find worldwide?
The saved snapshot records 384 matching company records, 70,175 tracked contacts and 17,662 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: November 5, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
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Cite this list
RevenueBase Data Team. Top 25 nuclear reactor design companies worldwide. Snapshot: November 5, 2026. https://revenuebase.ai/companies/browse/nuclear-reactor-design-companies.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗