Design
The PALLAS-reactor is designed as a pool-type reactor. This means that the reactor core is located inside a large water pool. This pool not only provides natural shielding against radiation but also allows for safe experiments and isotope irradiations during regular operation. Because the water is clear, researchers have a good view of what happens in and around the core. The thick concrete walls surrounding the pool further contribute to a safe working environment. In this way, we combine transparency with safety—both literally and figuratively.
The technical design requirements and their motives
Safety, reliability, and future-proofing are central to the design of the PALLAS-reactor. Nuclear safety is the highest priority: we ensure that people and the environment are always protected from ionizing radiation. But safety alone is not enough. Our reactor must also be able to operate continuously. Therefore, productivity is an important principle—with emphasis on reliability in both production and operations.
We choose proven technology: systems and components that operate successfully worldwide. This helps us reduce risks and accelerate the licensing process. At the same time, the design is flexible, meaning we can adjust the reactor capacity to changing market demands—without compromising on quality or safety. The design is also adaptable, ensuring we remain relevant to our customers throughout the reactor’s entire lifespan. Finally, simplicity is a strength. A clear layout, a limited number of systems, and a user-friendly setup enable us to operate reliably.
Reactor and service pool
At the heart of the reactor is the core – which contains the fuel elements of low-enriched uranium. This means that the amount of uranium-235 (235U) is less than 20 per cent of the total amount of uranium used (mostly 238U). During the fission process, neutrons are produced here. The core is surrounded by light-colored water, which not only provides cooling but also helps slow down the chain reaction as a moderator.
Next to the reactor is the service pool. Here, irradiated elements are temporarily stored before being further processed in the so-called hot cells. Used fuel is also given a temporary safe place here, awaiting transport. In this way, we ensure controlled and safe handling of nuclear material.
Hot cells
The hot cells are specially designed rooms where medical isotopes—produced in the reactor core—are further processed. In these shielded spaces, staff can safely work with radioactive materials, thanks to robust technology and careful procedures.
Through the combination of expertise, safe working conditions, and advanced equipment, the hot cells directly contribute to making medical isotopes available to patients worldwide.
