Company lists · Data refreshed September 2026
Top 25 Nuclear staffing and training companies based in the United States
RevenueBase identified 101 nuclear staffing and training companies headquartered in the United States as of September 2026 and tracks 15,202 professional contacts across them, including 607 with verified work emails and 5,584 with mobile numbers. Oak Ridge is the largest hub.
This list covers nuclear staffing and training companies headquartered in the United States, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.
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 staffing and training companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Westinghouse Electric CompanyPartial evidence | 10,898 | |||
“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,254 | ||||
“EnergySolutions is an international nuclear services company headquartered in Salt Lake City, Utah, and Charlotte, North Carolina, with operations across the United States and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | Sonic SystemsPartial evidence | 245 | |||
“Founded in 1977 Sonic Systems International (SSI) is a full-service quality-consulting firm serving the nuclear power generation utility industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | Spectra Tech, INCPartial evidence | 162 | |||
“Spectra Tech is an engineering, environmental, and nuclear services company that focuses on providing high quality and cost-effective technical solutions for our Federal…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | HI Tech SolutionsPartial evidence | 129 | |||
“Hi Tech Solutions provides services to the nuclear power generation industry in four main areas: outage services (plant outages and reactor maintenance), nuclear fuel cycle…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 118 | ||||
“At Atkins Nuclear Solutions US, we offer client solutions crafted by the best engineers and specialists in the industry, served with truly exceptional customer service.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | NAC InternationalPartial evidence | 116 | |||
“NAC International Inc.(NAC) is an industry-leading provider of engineering, consulting, and nuclear fuel management solutions for nuclear facility operators, fuel cycle companies…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | Tfe, INCIndirect evidence | 79 | |||
“Founded in 1989, TFE, Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Value Added Solutions, Inc. VASIndirect evidence | 78 | |||
“Value Added Solutions, Inc.(VAS) is a best in class Technical Staff Augmentation Contractor to the U.S.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Zachry Nuclear Engineering, INCIndirect evidence | 61 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 47 | ||||
“EXCEL has evolved over the last four decades to meet the needs of the nuclear energy industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Sigma Science, INCIndirect evidence | 46 | |||
“Sigma Science is now part of the RSI Group.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | Renuke ServicesPartial evidence | 45 | |||
“Managing the transition to 21st century Utilities including Commercial and DOE Nuclear Power, Fossil and Hydro Power, Electrical and Gas Transmissions & Distribution and other…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 42 | ||||
“Analysis and Measurement Services Corporation (AMS) is a nuclear engineering consulting firm and recognized market leader in providing the worldwide nuclear power industry with…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | Master-Lee Energy Services CorporationPartial evidence | 38 | |||
“Established in 1987, Master-Lee Energy Services was founded to provide the commercial Nuclear Power Industry with engineering, reactor services, decontamination, Reactor Coolant…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | Paschal Solutions, INCPartial evidence | 36 | |||
“At Paschal Solutions, we are more than engineers-we are problem solvers, innovators, and trusted partners in providing nuclear safety and specialized nuclear engineering technical…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | Tssd Services, INCPartial evidence | 36 | |||
“TSSD offers broad scope, project-based staff augmentation to the nuclear industry as its core business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | Wmg, INCIndirect evidence | 33 | |||
“Founded in 1979 and now an EnergySolutions company, WMG, Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | GTTSIPartial evidence | 24 | |||
“Global Technical Training Services, Inc.(GTTSi) is a privately held South Carolina corporation and a women/minority owned small business.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Pkmj Technical Services, INCPartial evidence | 14 | |||
“PKMJ is an organization of experienced personnel dedicated to supporting the Nuclear Power Industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Transware Enterprises INCIndirect evidence | 11 | |||
“Whether your goal is to maintain an existing reactor, decommission an old reactor, or design a new one, TransWare Enterprises Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Trivis INCIndirect evidence | 10 | |||
“Our Company TriVis Inc.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | Nuclear Fuel ServicesPartial evidence | 9 | |||
“Nuclear Fuel Services, Inc.(NFS) is a strategic asset for America and an economic engine for Northeast Tennessee.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 9 | ||||
“Black Diamond Consultants is a privately held corporation created for the mutual benefit of its shareholders, clients and consultants.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Independent Strategic Management Solutions, INCIndirect evidence | 8 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 101 nuclear staffing and training companies based in the United States
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Nuclear staffing and training companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 staffing and training companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “nuclear staffing and training companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among nuclear staffing and training companies, and records with no verified work email. Companies headquartered outside United States 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 an evidence 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, 607 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 5, 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
How many nuclear staffing and training companies are there based in the United States?
RevenueBase identified 101 nuclear staffing and training companies headquartered in the United States 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?
Westinghouse Electric Company, headquartered in Cranberry Township, tops this list with the largest team on record.
Which city has the most nuclear staffing and training companies?
Oak Ridge leads with 4 headquartered companies, followed by Richland (3) and Aiken (2).
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 607 verified decision-maker contacts tracked across these 101 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 5, 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 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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