On a nuclear site, when preparing an intervention in a controlled area, the first question that arises is not “what tool to bring?” but “what level of collective dose are we going to engage?” It is precisely to answer this question on an international scale that the ISOE program exists.
This information system on occupational exposure to radiation gathers dosimetric data from hundreds of nuclear power plants around the world. It serves as a concrete management tool for operators, service providers, and regulatory authorities.
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ISOE and radiation protection in nuclear plants: a network led by the IAEA and the OECD/NEA
The acronym ISOE (Information System on Occupational Exposure) refers to an international program for collecting and sharing data on radiation doses received by workers in nuclear power plants. It can be summarized as: a global database on occupational exposure in the nuclear environment.
This program is co-managed by the International Atomic Energy Agency (IAEA) and the Nuclear Energy Agency (NEA) of the OECD. The two organizations jointly ensure the coordination, secretariat, and hosting of the information system. When working on the dosimetry of a site, ISOE data serves as a reference to compare our results with those of similar facilities.
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To learn more about RDV Pro, the platform details the stakes related to this system in a broader professional context.
The network is structured around regional technical centers (Europe, Americas, Asia) that facilitate local exchanges. This organization allows operators of the same technological park to compare their radiation protection practices without waiting for annual conferences.
How ISOE works: what data is collected and by whom
Specifically, each participating nuclear site regularly transmits its dosimetric data to the ISOE system. We talk about collective doses (the sum of individual doses received by all personnel over a given period) and average individual doses, broken down by type of activity.
Data transmitted by operators
- The annual collective dose of the site, expressed in man-sievert, which reflects the overall radiological burden of maintenance and operational activities
- The distribution of doses by category of work (mechanical maintenance, non-destructive testing, circuit cleaning, fuel operations)
- Performance indicators in radiation protection, such as the number of workers exceeding certain dose thresholds during the period
- Feedback on techniques that have helped reduce exposure (temporary shielding, robotics, optimization of intervention schedules)
This data is anonymized before being integrated into the common database. The operator retains control of its raw information but agrees to its consolidation for international benchmarking purposes.
Who feeds the system on a daily basis
On the ground, it is the radiation protection services of the plants that compile the data. National regulatory authorities also participate by validating certain reports. Service providers operating in the controlled area do not transmit data directly, but their doses are integrated through the contracting operator.
Concrete usefulness of ISOE for nuclear professionals
Having an international database is only useful if it is used to make operational decisions. ISOE allows for comparing the dosimetric performance of a site with that of reactors of the same technology in other countries.
When a radiation protection manager notices that the collective dose of their site exceeds the ISOE median for equivalent reactors, it triggers an analysis. We then look for the workstations or projects that are driving the dose higher.
Benchmarking between similar plants
The program classifies data by technological sector (pressurized water reactors, boiling water reactors, etc.). This segmentation makes comparisons relevant. A French operator can thus measure its results against those of Korean or American plants using the same technology.
The ISOE benchmark identifies transferable best practices from one site to another. For example, if a Japanese plant has halved the collective dose for a type of maintenance through a chemical decontamination technique, this information is shared within the network and becomes accessible to other participants.
Optimization of field interventions
Feedback varies by installation, but the principle remains the same: before a major outage, teams consult ISOE data to calibrate their dosimetric forecasts. They identify the most exposing projects, adjust protective measures, and review intervention durations.
This preparatory work relies on real data, not theoretical estimates. ISOE transforms international feedback into a local planning tool.
ISOE and dose management: the limits to know
The ISOE system only covers nuclear power plants. Facilities in the fuel cycle (enrichment, reprocessing, storage) or research sites are not integrated in the same way. For a service provider operating in several types of installations, ISOE data only provides a partial view of occupational exposure to radiation.
The quality of the data also depends on the rigor of national reporting. Not all participating countries have the same dosimetric monitoring practices or the same reporting thresholds. Comparisons between countries must take these methodological differences into account.
The program publishes annual reports and thematic analyses that help contextualize the figures. These documents are accessible to participants via the regional technical centers, making them a regulatory and technical monitoring tool for HSE managers and radiation protection engineers.
Today, ISOE remains the only international system offering this level of granularity on occupational exposure in nuclear power plants. For operators and service providers, it is a lever for continuous improvement based on a simple principle: we progress better when we can measure ourselves against others.