The main objective of an Alarm Management System (AMS) is the reduction of the operator alarm overload that is present in the advanced alarm systems currently being installed in new plant project applications, by identifying and presenting only those alarms with high operational value and important information that require an operator immediate action to address the alarm source. The main issues about AMS are the great number of defined alarms (especially in digital I&C systems) and the lack of distinction between informational notices and true alarms (especially overwhelming during normal, non-emergency events). As a result, “avalanches” of alarms occur during events, complicating and delaying the plant safety status identification while increasing the operator´s workload and cognitive stress. In order to achieve the desired reduction of the operator workload alarm overload in existing and upcoming new plants, a methodology and a software application have been developed to focus into two principal processes: the prioritization and the application of filtering techniques. The alarm generation is supposed already defined by the plant and the presentation is dependent on the selected platform. The proposed scheme applies a prioritization process (static and dynamic) that organizes the alarms according to their severity and subsequently, followed by several filtering techniques that reduce the number of alarms shown to the operator. The static prioritization analyzes qualitatively and quantitatively each individual alarm considering its severity and available response time. The dynamic prioritization modifies this value depending on its relevance during the current plant operating condition (combination of a plant operating mode and an event). Once the alarms have been prioritized, they are classified by means of automatic filtering techniques so that only those significant for the ongoing plant operating condition are showed to the operator as “important” thus reducing the associated workload and cognitive stress. EPRI, through its Advanced Nuclear Technologies (ANT) program, sponsored this research project designed to test and validate this methodology and to demonstrate the improvement of the operator´s awareness and understanding of alarm status. This paper reflects the main results of this research project conducted between May 2017 and October 2018.