The safety demonstration of Autonomous vehicles (AVs) has to deal with not only the guarantee of the functional safety but also with the assurance of the Safety of The Intended Functionality (SOTIF). The functional safety is essentially covered by the compliance with the ISO 26262 while the SOTIF or the functional insufficiencies of the intended functionality is at this time addressed by the ISO-PAS 21448. To address the challenge of SOTIF, manufacturers' attention is focused on the identification of the scenarios that the vehicle will face during its operating phase, in order to evaluate mainly the AV safety by simulation-based process. These scenarios have to be analyzed and evaluated with regards to safety. In this paper, we start by discussing the concept of scenario for simulation-based validation process of AV and then, we propose a refined definition. Next, we identify some of the functional insufficiencies of AV and its potential hazardous behaviours. This step is necessary to conduct the safety assessment of the scenarios that the AV will be exposed to. Thus, as one of the objectives behind this assessment is to check whether the final situation resulting from AV reaction is not harmful to other users, we use the Hazardous behaviour criterion and other identified ones to evaluate and classify the simulated scenarios. Finally, we will conclude with this paper in the last part.