Company lists · Data refreshed September 2026

Top 25 Nuclear engineering software companies based in the United States

RevenueBase identified 176 nuclear engineering software companies headquartered in the United States as of September 2026 and tracks 24,168 professional contacts across them, including 1,292 with verified work emails and 8,808 with mobile numbers. Oak Ridge is the largest hub.

This list covers nuclear engineering software 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
176Companies
24,168Contacts tracked
1,292Verified emails
8,808Mobile numbers
Unlock all 176 companies Free signup · no credit card · 500 free credits

The 25 largest nuclear engineering software companies based in the United States

Ranked by team size
Top 25 of 176 nuclear engineering software companies based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names nuclear engineering software companies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1Cranberry Township, PA, United StatesHQ checked Sep 5, 20265,001-10,00010,898

“Westinghouse Electric Company is the world's leading supplier of safe and innovative nuclear technology.”

Source: company website · checked Sep 5, 2026
2
BWXTIndirect evidence
Lynchburg, VA, United StatesHQ checked Sep 5, 20265,001-10,0003,832

“At BWX Technologies, Inc.(NYSE: BWXT), we are People Strong, Innovation Driven.”

Source: company website · checked Sep 5, 2026
3
EnergysolutionsPartial evidence
Salt Lake City, UT, United StatesHQ checked Sep 5, 20261,001-5,0001,254

“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, 2026
4
X-EnergyPartial evidence
Rockville, MD, United StatesHQ checked Sep 5, 2026501-1,0001,055

“X-energy is delivering the next generation of carbon-free energy by reinventing nuclear power.”

Source: company website · checked Sep 5, 2026
5
GSE SolutionsStrong evidence
Columbia, MD, United StatesHQ checked Sep 5, 2026201-500404

“GSE Solutions supports nuclear power and clean-energy fleets worldwide through integrated engineering services and software that strengthen operational performance.”

Source: company website · checked Sep 5, 2026
6
Paragon Energy SolutionsPartial evidence
Fort Worth, TX, United StatesHQ checked Sep 5, 2026201-500234

“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: company website · checked Sep 5, 2026
7
Spectra Tech, INCStrong evidence
Oak Ridge, TN, United StatesHQ checked Sep 5, 2026201-500162

“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, 2026
8
HI Tech SolutionsPartial evidence
Kennewick, WA, United StatesHQ checked Sep 5, 2026501-1,000129

“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, 2026
9
Morris Material HandlingPartial evidence
Oak Creek, WI, United StatesHQ checked Sep 5, 2026501-1,000123

“With more than a half-century in the nuclear business, is an expert in nuclear material handling and lifting equipment.”

Source: company website · checked Sep 5, 2026
10
Aalo AtomicsPartial evidence
Austin, TX, United StatesHQ checked Sep 5, 2026201-500119

“Aalo Atomics designs and builds factory-manufactured nuclear power plants for data centers, industry, and cities.”

Source: company website · checked Sep 5, 2026
11Charlotte, NC, United StatesHQ checked Sep 5, 202651-200118

“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, 2026
12
NAC InternationalStrong evidence
Peachtree Corners, GA, United StatesHQ checked Sep 5, 202651-200116

“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, 2026
13
HukariascendentStrong evidence
Wheat Ridge, CO, United StatesHQ checked Sep 5, 202651-200104

“HukariAscendent is a technical consulting and engineering company specializing in comprehensive engineering and technical services associated with the nuclear industry and power…”

Source: company website · checked Sep 5, 2026
14
NFT INCIndirect evidence
Golden, CO, United StatesHQ checked Sep 5, 202651-20076

“NFT, founded in 1984 and headquartered in Golden Colorado along with EPD located in Carlsbad New Mexico, is an industry leader dedicated to the manufacturing of highly engineered…”

Source: company website · checked Sep 5, 2026
15
Rmd, A Dynasil CompanyPartial evidence
Watertown, MA, United StatesHQ checked Sep 5, 202651-20072

“Radiation Monitoring Devices, Inc.(RMD) is among the foremost experts in the fields of radiation detection and imaging, nuclear instrumentation, and non-destructive test equipment.”

Source: company website · checked Sep 5, 2026
16Stonington, CT, United StatesHQ checked Sep 5, 202651-20061
Source: company website · checked Sep 5, 2026
17New York, NY, United StatesHQ checked Sep 5, 202651-20050

“NANO Nuclear Energy Inc.(NASDAQ: NNE) NANO Nuclear Energy Inc.(NASDAQ: NNE) is a North American advanced technology-driven nuclear energy company seeking to become a commercially…”

Source: company website · checked Sep 5, 2026
18Rockville, MD, United StatesHQ checked Sep 5, 202651-20047

“EXCEL has evolved over the last four decades to meet the needs of the nuclear energy industry.”

Source: company website · checked Sep 5, 2026
19Knoxville, TN, United StatesHQ checked Sep 5, 202651-20042

“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, 2026
20
CodewarePartial evidence
Sarasota, FL, United StatesHQ checked Sep 5, 202651-20040

“We deliver specialized software to meet the evolving needs of industries such as oil & gas, petrochemical, and aerospace.”

Source: company website · checked Sep 5, 2026
21Latrobe, PA, United StatesHQ checked Sep 5, 2026201-50038

“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, 2026
22
Paschal Solutions, INCStrong evidence
Oak Ridge, TN, United StatesHQ checked Sep 5, 202651-20036

“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, 2026
23
RBM Services, LLCPartial evidence
Oak Ridge, TN, United StatesHQ checked Sep 5, 202611-5034

“RbM Services, LLC has been manufacturing nuclear medical devices in East Tennessee for more than twenty years.”

Source: company website · checked Sep 5, 2026
24
Wmg, INCIndirect evidence
Peekskill, NY, United StatesHQ checked Sep 5, 202611-5033

“Founded in 1979 and now an EnergySolutions company, WMG, Inc.”

Source: company website · checked Sep 5, 2026
25
Studsvik ScandpowerStrong evidence
Idaho Falls, United StatesHQ checked Sep 5, 202651-20032

“Studsvik Scandpower Group is a subsidiary of Studsvik AB (STO:SVIK), and specializes in nuclear engineering simulation software that enables nuclear engineers to design nuclear…”

Source: company website · checked Sep 5, 2026

Showing 25 of 176 nuclear engineering software companies based in the United States

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Nuclear engineering software companies based in the United States at a glance

As of Sep 5, 2026
11-50Median size (employees)
Oak RidgeLargest hub · 8 HQs
8,808Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
70
11-50
52
51-200
33
201-500
7
501-1,000
5
1,001-5,000
4
5,001-10,000
4

Verified emails by last verification

0–30
1,193
31–60
72
61–90
1
90–180
1
180+
25

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 engineering software 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 engineering software 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 engineering software 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, 1,292 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 engineering software companies are there based in the United States?

RevenueBase identified 176 nuclear engineering software 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 engineering software companies?

Oak Ridge leads with 8 headquartered companies, followed by New York (5) and Charlotte (4).

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 1,292 verified decision-maker contacts tracked across these 176 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.