The paper presents the set of analytical tools for CBRN risk analysis. They are modules of WAZkA system, which is IT system supporting the analysis of contamination risks and alarming in Poland. The Event Tree is a graphical representation of a chronological sequence of events, substantial from the point of view of functioning of the object, which occur after a given event that initiates such sequence. Events Tree Analyser tool, which implements Event Tree, was built according to client-server architecture and apart from web browser it does not require any additional user-installed software. If the Event Tree is associated with an initiating event that has its location, the prototype of WAZkA system allows the calculation of the so-called Loss Table. Each row in the Loss Table corresponds to a single effect in the event tree (leaf of the tree). Having threat zones from simulation experiment (e.g. Aloha software), a specialized expert algorithm is launched, which calculates the potential human losses in each zone and inputs them in the Loss Table. Finally, the Common Operational Picture. Visualization module is used to visualize results of simulation and analyses.