In May 2026, a new version of one of the world’s most important nuclear data libraries—ENDF/B‑VIII.1—was published. It has long been regarded as the “gold standard” for computational simulations in nuclear engineering and physics. Its data are used across the field, from basic research to the design and safety of nuclear facilities.
The CVŘ also played a significant role in the development of this update. Its involvement took place primarily through an extensive nuclear data validation program conducted at the LR-0 research reactor and at a Cf-252-based isotopic neutron source. Both facilities are part of the large CICRR research infrastructure and enable the conduct of cutting-edge experiments with high precision and international relevance.
The results of our teams’ work have a concrete impact on the new library—ENDF/B-VIII.1 cites 12 scientific publications produced in Řež in the field of nuclear data validation. Our colleagues from the Department of Neutron Physics also contributed as authors to the preparation of the new version.
The CVŘ’s contribution has a broad impact; data from the ENDF library are incorporated into a wide range of computational simulations used in the design, operation, and safety assessment of nuclear facilities. This applies not only to current technologies but also to future directions, such as Generation IV reactors, small modular reactors (SMRs), or fusion systems.
