INPRO is an international project to help ensure that nuclear energy is available to contribute in a sustainable manner to meeting the energy needs of the twenty-first century. Between July 2009 and October 2011, Belarus used INPRO methodology to undertake a review of their planned nuclear energy system with regard to its long range sustainability. This report comprises a description of the assessed nuclear energy system based on novel reactors of Russian design (AES-2006) and the results of assessment of that system using the INPRO methodology. The report identifies follow up actions for the further development and successful implementation of nuclear energy in Belarus. The publication may also serve as a model Nuclear Energy System Assessment for other Member States, as it covers all seven INPRO areas: Safety, Infrastructure, Proliferation Resistance, Physical Protection, Waste Management, Environment and Economics.