ROSATOM’s RAOS Project Oy, the plant supplier of Hanhikivi-1 NPP, has submitted the Basic Design Stage 1 documentation package containing technical solutions description to Fennovoima Oy, the NPP Customer. The package has been reviewed by Fennovoima’s specialists and conditionally accepted for further work. The Basic Design Stage 1 package comprises the main stages of documentation development for the creation of the NPP design. In accordance with the EPC contract, the submitted package includes description of such key areas as conceptual and functional NPP design, 3D model, NPP systems and buildings design.The newly submitted design documentation provides the basis for the Preliminary Safety Analysis Report, which shall be reviewed and accepted by the Finnish Radiation and Nuclear Safety Authority before the construction license is granted by the Finnish government.Consisting of 15 batches, PSAR is the main document of the license application. It presents a detailed description of all safety-related aspects: NPP site selection, basic design and technical solutions, safety measures, as well as the results of design validations from a safety point of view.To date, five PSAR batches have already been submitted by the Customer to STUK for review. The goal of RAOS Project is to deliver two more batches of documents to Fennovoima before the end of this year and to complete the Preliminary Safety Analyses Report in spring 2021.STUK requirements in terms of the detailing level of documents at licensing stage are higher if compared to most other countries. This high level of detail at the construction license stage provides advantages for further project stages, avoiding delays and saving the need for works to be re-designed after the actual construction started.