Company lists · Data refreshed September 2026

Top 25 Nuclear facility engineering firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 285 companies tracked

RevenueBase identified 285 nuclear facility engineering firms headquartered in the United States as of September 2026 and tracks 59,468 professional contacts across them, including 6,783 with verified work emails. Oak Ridge is the largest hub.

This list covers nuclear facility engineering firms 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, 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

285Companies

59,468Contacts tracked

6,783Verified emails

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The 25 largest nuclear facility engineering firms based in the United States

Ranked by team size

Top 25 of 285 nuclear facility engineering firms based in the United States, 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	Bechtel Corporation	Partial evidence	Reston, VA, United StatesHQ checked Sep 17, 2026	10001+	25,068 contacts →
	Partial evidence “Bechtel is a trusted engineering, construction and project management partner to industry and government.” Source: RevenueBase Database · checked Sep 17, 2026
2	Westinghouse Electric Company	Partial evidence	Cranberry Township, PA, United StatesHQ checked Sep 17, 2026	5,001-10,000	10,898 contacts →
	Partial evidence “Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.” Source: RevenueBase Database · checked Sep 17, 2026
3	BWXT	Indirect evidence	Lynchburg, VA, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,832 contacts →
	Indirect evidence “At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.” Source: RevenueBase Database · checked Sep 17, 2026
4	NAES	Indirect evidence	Issaquah, WA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,956 contacts →
	Indirect evidence “NAES is the power generation industry’s largest independent services provider, with more than 40 years of experience managing risk and turning it into profits.” Source: RevenueBase Database · checked Sep 17, 2026
5	Energysolutions	Partial evidence	Salt Lake City, UT, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,254 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
6	X-Energy	Partial evidence	Rockville, MD, United StatesHQ checked Sep 17, 2026	501-1,000	1,055 contacts →
	Partial evidence “X-energy is delivering the next generation of carbon-free energy by reinventing nuclear power.” Source: RevenueBase Database · checked Sep 17, 2026
7	Ares Corporation	Partial evidence	Mclean, VA, United StatesHQ checked Sep 17, 2026	501-1,000	518 contacts →
	Partial evidence “ARES Corporation is one of the foremost Engineering, Project Management, Reliability and Mission Assurance, IT Architecture and Security, and Software Solutions companies in the…” Source: RevenueBase Database · checked Sep 17, 2026
8	Kairos Power	Indirect evidence	Alameda, CA, United StatesHQ checked Sep 17, 2026	501-1,000	485 contacts →
	Indirect evidence “Kairos Power has a mission to enable the world’s clean energy transition to improve people’s quality of life while protecting the environment.” Source: RevenueBase Database · checked Sep 17, 2026
9	Navarro Research And Engineering	Partial evidence	Oak Ridge, TN, United StatesHQ checked Sep 17, 2026	201-500	468 contacts →
	Partial evidence “Navarro Research & Engineering is an award-winning federal contractor dedicated to partnering with our clients to overcome their most challenging environmental, technical, and…” Source: RevenueBase Database · checked Sep 17, 2026
10	GSE Solutions	Strong evidence	Columbia, MD, United StatesHQ checked Sep 17, 2026	201-500	404 contacts →
	Strong evidence “GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.” Source: RevenueBase Database · checked Sep 17, 2026
11	MPR Associates, INC	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 17, 2026	201-500	353 contacts →
	Partial evidence “In 1964, a trio of visionary engineers, from Admiral Rickover's Naval nuclear propulsion program, set out to form a company built around technical excellence.” Source: RevenueBase Database · checked Sep 17, 2026
12	Sonic Systems	Partial evidence	Wilmington, NC, United StatesHQ checked Sep 17, 2026	501-1,000	245 contacts →
	Partial evidence “Founded in 1977 Sonic Systems International (SSI) is a full-service quality-consulting firm serving the nuclear power generation utility industry.” Source: RevenueBase Database · checked Sep 17, 2026
13	Paragon Energy Solutions	Partial evidence	Fort Worth, TX, United StatesHQ checked Sep 17, 2026	201-500	234 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
14	Boston Government Services, LLC BGS	Strong evidence	Oak Ridge, TN, United StatesHQ checked Sep 17, 2026	201-500	224 contacts →
	Strong evidence “Boston Government Services, LLC (BGS) is an engineering, technology, and security firm providing mission-focused solutions for the clean energy, nuclear, and federal programs…” Source: RevenueBase Database · checked Sep 17, 2026
15	Vertex Aerospace, LLC	Partial evidence	Queenstown, MD, United StatesHQ checked Sep 17, 2026	n/a	213 contacts →
	Partial evidence “Vertex Aerospace, LLC is an engineering services company headquartered in Maryland, specializing in thermal engineering design, analysis and test support for government and…” Source: RevenueBase Database · checked Sep 17, 2026
16	Strategic Management Solutions, LLC Smsi	Partial evidence	Albuquerque, NM, United StatesHQ checked Sep 17, 2026	201-500	188 contacts →
	Partial evidence “SMSI is a small business providing management and technical/engineering services to the DOE/NNSA, national laboratories, and industrial clients.” Source: RevenueBase Database · checked Sep 17, 2026
17	United Engineers & Constructors An Aecon Company	Partial evidence	Mount Laurel, NJ, United StatesHQ checked Sep 17, 2026	201-500	187 contacts →
	Partial evidence “United Engineers & Constructors is an industry-leading infrastructure engineering, procurement, construction, and consulting company dedicated to improving lives by delivering the…” Source: RevenueBase Database · checked Sep 17, 2026
18	Spectra Tech, INC	Strong evidence	Oak Ridge, TN, United StatesHQ checked Sep 17, 2026	201-500	162 contacts →
	Strong evidence “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: RevenueBase Database · checked Sep 17, 2026
19	Premier Technology INC	Indirect evidence	Blackfoot, ID, United StatesHQ checked Sep 17, 2026	201-500	138 contacts →
	Indirect evidence “Premier Technology, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
20	HI Tech Solutions	Partial evidence	Kennewick, WA, United StatesHQ checked Sep 17, 2026	501-1,000	129 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
21	Morris Material Handling	Partial evidence	Oak Creek, WI, United StatesHQ checked Sep 17, 2026	501-1,000	123 contacts →
	Partial evidence “With more than a half-century in the nuclear business, is an expert in nuclear material handling and lifting equipment.” Source: RevenueBase Database · checked Sep 17, 2026
22	LATA	Indirect evidence	Albuquerque, NM, United StatesHQ checked Sep 17, 2026	51-200	120 contacts →
	Indirect evidence “Founded in New Mexico in 1975, Los Alamos Technical Associates provides technical and project management services to a varied clientèle including federal agencies, state…” Source: RevenueBase Database · checked Sep 17, 2026
23	Aalo Atomics	Partial evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	201-500	119 contacts →
	Partial evidence “Aalo Atomics designs and builds factory-manufactured nuclear power plants for data centers, industry, and cities.” Source: RevenueBase Database · checked Sep 17, 2026
24	Atkins Nuclear Solutions US	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 17, 2026	51-200	118 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 17, 2026
25	NAC International	Strong evidence	Peachtree Corners, GA, United StatesHQ checked Sep 17, 2026	51-200	116 contacts →
	Strong evidence “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: 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 285 nuclear facility engineering firms based in the United States

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Nuclear facility engineering firms based in the United States at a glance

As of Sep 17, 2026

11.4%Verified-email coverage

208.7Average contacts per company

11-50Median size (employees)

4.2%Largest-city concentration · Oak Ridge

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

110

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 United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 285 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 the United States 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 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 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, 6,783 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 the United States?

RevenueBase identified 285 nuclear facility engineering firms 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?

Bechtel Corporation, headquartered in Reston, tops this list with the largest team on record.

Which city has the most nuclear facility engineering firms?

Oak Ridge leads with 12 headquartered companies, followed by Albuquerque (6) and Knoxville (6).

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 6,783 verified decision-maker contacts tracked across these 285 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.