Company lists · Data refreshed September 2026
Top 22 Reactor safety analysis software companies based in the United States
RevenueBase identified 57 reactor safety analysis software companies headquartered in the United States as of September 2026 and tracks 1,133 professional contacts across them, including 371 with verified work emails and 506 with mobile numbers. Idaho Falls is the largest hub.
This list covers reactor safety analysis 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.
The 22 largest reactor safety analysis software companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 404 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 2 | Fauske & AssociatesPartial evidence | 60 | |||
“Fauske & Associates (FAI) is a world leader in nuclear, industrial and chemical process safety.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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. | |||||
| 4 | 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. | |||||
| 5 | 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. | |||||
| 6 | 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. | |||||
| 7 | Studsvik ScandpowerPartial evidence | 32 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 8 | NuclearnPartial evidence | 23 | |||
“With over 60 reactors around the world relying on our technology, Nuclearn is built on one simple idea: nuclear deserves better tools.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | Pkmj Technical Services, INCIndirect 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. | |||||
| 10 | Engineering Planning And Management, INCPartial evidence | 12 | |||
“EPM is a multi-discipline engineering company that provides cost-effective solutions for safe and reliable operation of nuclear power plants.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 11 | ||||
“FPoliSolutions specializes in the execution of complex analytical projects for industry segments that demands absolute reliability and safety.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | Transware Enterprises INCPartial 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. | |||||
| 13 | Veracity NuclearIndirect evidence | 8 | |||
“Veracity Nuclear brings game-changing technology to bear on problems that remain unsolved by traditional modeling and simulation used by the nuclear industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | Radiological Solutions INCIndirect evidence | 7 | |||
“Radiological Solutions (RSI) is a nuclear engineering and consulting firm specializing in water chemistry optimization, radiological dose management, gamma scanning, and…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | ScirisqStrong evidence | 6 | |||
“SciRisq, formerly named Analytical & Computational Energetics (ACE), specializes in the development and implementation of risk and consequence analysis software.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | Grove Engineering, INCIndirect evidence | 5 | |||
Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | Insight Numerics, LLCStrong evidence | 4 | |||
“Insight Numerics is dedicated to building the most advanced, visually intuitive software for safety analysis in the oil and gas industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 | ||||
“EMPC created, develops, and licenses the NOVICE Software Suite.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | Inservice EngineeringIndirect evidence | 3 | |||
“Inservice Engineering is celebrating its 20th year of providing quality engineering services to the nuclear industry!” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Difrex LLC Nexgen Reactor DesignPartial evidence | 2 | |||
“DIFREX is a Florida based team of chemical and process engineers with years of experience in designing, developing and servicing reactors and auxiliary systems.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | Lightwater CorporationIndirect evidence | 2 | |||
“Provides engineering services to nuclear utilities and related industries.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | Pincer LLCIndirect evidence | 1 | |||
“Welcome to Professionals in Nuclear Consulting Engineering and Research (PINCER).” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 22 of 57 reactor safety analysis software companies based in the United States
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Reactor safety analysis software 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 reactor safety analysis 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 “reactor safety analysis 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 reactor safety analysis 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, 371 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 reactor safety analysis software companies are there based in the United States?
RevenueBase identified 57 reactor safety analysis 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?
GSE Solutions, headquartered in Columbia, tops this list with the largest team on record.
Which city has the most reactor safety analysis software companies?
Idaho Falls leads with 4 headquartered companies, followed by Gaithersburg (3) and Framingham (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 371 verified decision-maker contacts tracked across these 57 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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