Tritium in the Environment
Technical Reports Series No. 495 ¦ English ¦ STI/DOC/010/495 ¦ 362 pages ¦ Date published: 2025

This Technical Reports Series publication incorporates contemporary information and scientific knowledge on the behaviour of tritium in the environment. It directly addresses existing and future concerns relating to anthropogenic sources of tritium that arise from power generation using nuclear fission and fusion technologies, nuclear fuel cycle activities, industrial and medical applications, accidental and deliberate releases, as well as military activities.

This publication is also intended to serve as a technical reference on the radioecology of tritium, addressing current societal needs and acting as a guide for specialists and members of the public in understanding future environmental impacts. The intended audience of this publication includes specialists in radioecology, as well as technical specialists and decision makers dealing with the assessment of the impact of radioactivity on humans and the environment.

Assessment of Radioactive Contamination, Exposures and Countermeasures in Urban Environments
IAEA-TECDOC-2096 ¦ English ¦ 216 pages ¦ Date published: 2025

This TECDOC presents the outcomes of international model validation exercises aimed at improving the performance of models used to assess radioactive contamination in urban environments. Building on the work of Working Group 2 under the MODARIA I programme, this intercomparison introduced models of greater complexity.

The exercises addressed various scenarios, including dispersion and deposition events, short- and long-term redistribution of contaminants following deposition, and the evaluation of potential countermeasures or remediation strategies to reduce human exposure.

Safety of Nuclear Fuel Cycle Research and Development Facilities
IAEA Safety Standards Series No. SSG-43 (Rev. 1) ¦ English ¦ STI/PUB/2107 ¦ 105 pages ¦ Date published: 2025

This Safety Guide provides recommendations on safety in the siting, design, construction, commissioning, operation and preparation for the decommissioning of nuclear fuel research and development facilities to meet the relevant requirements established in IAEA Safety Standards Series No. SSR-4, Safety of Nuclear Fuel Cycle Facilities.

It applies to all types of nuclear fuel cycle research and development facility, including facilities involving small scale experiments, analyses and fundamental research studies on the chemical, physical, mechanical and radiological properties of specific materials such as prototype nuclear fuels (before and after reactor irradiation) and investigations of nuclear materials and wastes arising from new processes, and facilities involving research and development on processes and equipment envisaged for use on an industrial scale (e.g. pilot facilities for waste treatment). This publication is intended for operating organizations and designers of nuclear fuel cycle research and development facilities and relevant technical support organizations and regulatory bodies.

Distribution Coefficients for Soil, Freshwater and Marine Systems for Exposure Assessments
IAEA-TECDOC-2095 ¦ English ¦ 172 pages ¦ Date published: 2025

This publication was developed as part of the IAEA’s MODARIA I and MODARIA II programmes, which focus on modelling and data for radiological impact assessments. It presents the outcomes of Working Group 4, which considered the update and improvement of distribution coefficient (Kd) values used in environmental models for exposure assessment for soil, freshwater, and marine systems.

As part of this effort, Kd datasets for soils and freshwater sediments were compiled. These datasets include associated chemical, physical, mineralogical, and other ancillary properties, along with detailed methodological guidance to support end users in selecting appropriate Kd values for their specific applications. For marine sediments, Kd data were compiled using sources from Japan, the Baltic Sea, and the IAEA’s Marine Radioactivity Information System (MARIS) database. These values were then compared with those published in the IAEA Technical Reports Series No. 422, Sediment Distribution Coefficients and Concentration Factors for Biota in the Marine Environment. This publication is intended for environmental regulators, scientists, modellers and assessors.

Guidelines for the Harmonization of Education and Training Requirements in Radiopharmacy
Training Course Series No. 88 ¦ English ¦ IAEA-TCS-88 ¦ 44 pages ¦ Date published: 2025

These guidelines provide a useful reference for Member States interested in establishing a training programme to ensure good radiopharmacy practices where they do not yet exist, or to upgrade and improve existing programmes.

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Benchmarking Current Practices in Probabilistic Fault Displacement Hazard Analysis for Nuclear Installations
IAEA-TECDOC-2092 ¦ English ¦ 88 pages ¦ Date published: 2025

This publication explores the findings of an IAEA-designed exercise focused on understanding probabilistic fault displacement hazard analysis (PFDHA) for nuclear installation sites. The IAEA benchmarking exercise examines fault displacement hazard curves from various earthquake scenarios, including the 2016 Kumamoto (magnitude 7.0), Norcia (magnitude 6.5), and the 2019 Le Teil (magnitude 4.9) earthquakes.

These events represent different fault types: strike-slip, normal, and reverse faulting and have documented fault displacements. This publication aims to share key results and insights from the PFDHA exercise, comparing hazard outcomes and explaining the factors behind observed differences. This will help Member States assess the compatibility of current fault displacement models with the earthquake scenarios that will possibly be used in nuclear safety evaluations.

Safety of Nuclear Fuel Reprocessing Facilities
IAEA Safety Standards Series No. SSG-42 (Rev. 1) ¦ English ¦ STI/PUB/2106 ¦ 135 pages ¦ Date published: 2025

This Safety Guide provides recommendations on safety in the siting, design, construction, commissioning, operation and preparation for the decommissioning of nuclear fuel reprocessing facilities to meet the relevant requirements established in the IAEA Safety Standards Series No. SSR-4, Safety of Nuclear Fuel Cycle Facilities. It provides specific recommendations on the safety of nuclear fuel reprocessing facilities that use the PUREX process to reprocess fuels containing uranium and plutonium.

It does not specifically address the reprocessing of thorium from fast breeder reactors or other advanced reactor systems, or the partitioning of radionuclides other than uranium and plutonium. However, the similarity between aqueous processes allows for the application of most of the recommendations provided in this Safety Guide, with suitable adjustments to facilities reprocessing other types of nuclear fuel. This publication is intended for operating organizations and designers of nuclear fuel reprocessing facilities and relevant technical support organizations and regulatory bodies.

Global Status of Front End Nuclear Fuel Cycle Inventories in 2023
CRCP/FUI/005 ¦ English ¦ 114 pages ¦ Date published: 2025

This publication is a revision of IAEA-TECDOC-2030, Global Inventories of Secondary Uranium Supplies, and is intended for IAEA Member States with existing nuclear power programmes and Member States considering adding nuclear power to their energy mix. This publication includes a supplementary file, available on-line, containing tables of uranic inventories by country and region.

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