Developed by
TopMC®
Multi-Functional Program for Neutronics Calculation, Nuclear Design and Safety Evaluation
A large-scale nuclear design software developed by FDS Consortium for more than 40 years — taking radiation transport calculation as the core, covering the whole process of neutronics calculation from depletion to shutdown dose rate.
New What’s new at TopMC
All updates →
Highlight 1 of 7: New TopMC release launched worldwide at ICRS-15
01 Explore
Everything about TopMC, in one place
Products
Overview with three editions, eight calculation functions and the advanced features that set TopMC apart.
Applications
How TopMC is applied across nuclear energy and nuclear technology, with real user and partner cases.
Resources
Publications, papers and step-by-step tutorials for TopMC users.
Events
Where to meet us — conferences, exhibitions and training — plus release notes.
About FDS
The FDS Consortium behind more than 40 years of TopMC development.
News
Announcements, technical articles and conference reports from the TopMC team.
Contact Us
Request a trial, a quote or technical support from our team.
02 Recognition
What the field says about TopMC
Nobel Laureate in Physicsovercoming the main challenges in complex nuclear system design and safety
no doubt has become a very important tool in this field
Member, Royal Swedish Academy of Engineering Sciences (IVA)The superior code TopMC has been developed with capabilities of a very high efficiency and used as intelligent tool for the nuclear researchers and engineers
International Coordinating Leader for Neutronics and Nuclear Analysis, ITERrepresented a major contribution to the progress in recent years in the field of neutronics
one of the leading teams in the relevant area in the world
03 Blog
From the TopMC blog
Key Publications — TopMC User Application Studies
Peer-reviewed research by TopMC users. Researchers at the China Institute for Radiation Protection used TopMC to study how the configuration of boron-containing polyethylene composites affects neutron shielding, for shielding materials in spent fuel transport casks.
Read article →November 5, 2026FDS Consortium Launches New TopMC Release Worldwide: Nuclear Design Software Moves Towards AI-Empowered “AI + Nuclear”
At the 15th International Conference on Radiation Shielding (ICRS-15) in Jeju, Korea, 25–29 October 2026, FDS Consortium launched a new release of its nuclear design software TopMC worldwide, showing how artificial intelligence is empowering nuclear design.
Read article →October 19, 2026TopMC Workshop at ICRS15-RPSD2026 — Jeju, 25 October 2026
FDS Consortium brings TopMC to the 15th International Conference on Radiation Shielding (ICRS15-RPSD2026) in Jeju, Korea. Join the TopMC Workshop on Sunday 25 October, 14:00–17:50, in the Charlotte Room at Lotte Hotel Jeju — on site, or online via Zoom; on-site participants receive a free 3-month TopMC license.
Read article →