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Case Study

Supporting the Swedish Radiation Safety Authority with the RASTEP Methodology


Swedish Radiation Authority (SSM)

Asset Type

Nuclear power plant



Client background

The Swedish Radiation Safety Authority (SSM) is tasked by the Ministry of the Environment and Energy to ensure nuclear safety, radiation protection and nuclear non-proliferation. SSM needed a tool to be able to rapidly estimate the radioactive release during nuclear power plant severe accidents – a tool which should be robust to situations with scarce or contradictory information.

Client challenge

SSM commissioned Vysus Group to design a tool using complex data and existing knowledge of nuclear power plant risk profiles, to create a fast and reliable tool for use in emergencies and practice exercises.

The challenge was to be able to use the complex set of data and best available knowledge on nuclear power plant risk profiles and accident progression, to create a fast and reliable tool for use in exercises and emergencies.

How we helped

Vysus Group helped SSM by developing a software graphical user interface, plant specific models of all Swedish nuclear power plants as well as methodologies to ensure quality and ease of use.

Today, RASTEP is routinely used by the source term group during severe accident exercises at SSM’s emergency preparedness and response center.

The future development includes building capacity to automatically feed RASTEP models with electronically transmitted process parameters, to further improve speed and accuracy in source term estimation.

By creating models to identify possible incident scenarios, this helped to develop our overall knowledge of complex risks, as well as specific areas of regulatory oversight.

Anders Riber Marklund Principal Consultant, Vysus Group

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