MOIRA-PLUS is a decision support system (DSS) designed to address the mid and long-term
issues after nuclear accidents causing the contamination of freshwater bodies and
catchments with radionuclides. It is designed to allow for a reliable assessment of the
long-term evolution of the radiological situation and of possible alternative
rehabilitation strategies, including an objective evaluation of their social, economic and
ecological impacts in a rational and comprehensive manner. MOIRA also features a decision
analysis methodology, making use of multi-attribute analysis, which can take into account
the preferences and needs of different types of stakeholders. The main functions and
elements of the MOIRA-PLUS DSS are described summarily, together with the conclusions from
end-user’s experiences with the system. MOIRA-PLUS has proven to be a mature system, user
friendly and relatively easy to set up. It can help to reassure the public by enabling a
realistic evaluation of the complete impacts of possible recovery strategies. However, the
users also identified possibilities for further improvement of the DSS.