Validated and verified, Flownex SE is developed within a rigorous quality system. Below you’ll find more information, as well as certifications.

Bringing Nuclear Quality Standards to System Simulation

Flownex® is developed in an ISO 9001:2015 and NQA1 quality assurance system environment. Flownex® is the only software of its kind to hold a nuclear accreditation, a testament to the quality, reliability and accuracy of our simulation software.


Flownex® was extensively validated and verified (V&V) in the nuclear industry and more specifically for the Pebble Bed Modular Reactor (PBMR). In 2007 the National Nuclear Regulator (NNR) in South Africa reviewed the Flownex® Software Verification & Validation (V&V) status and found it to be acceptable to be used to support the design and safety case for the PBMR. The components that are used in High Temperature Gas Reactors have been subjected to the formal Nuclear V&V process. Other components are tested internally using a similar V&V process.


Flownex® Simulation Environment software was awarded the status of being ASME NQA-1 and 10 CFR 50 Appendix B compliant following an audit in May 2016. This was accomplished on account of meeting the stringent quality requirements for nuclear safety-related design. The full software lifecycle therefore complies to being developed within a rigorous quality system that includes comprehensive verification and validation of all software components, traceability of all changes and continuous improvement from user feedback.