Vietnam planned to launch the project this year but Vietnamese Science and Technology Minister Nguyen Quan expected the delay due to additional safety measures, the Vietnam News reported.
Its first nuclear plant will be build in the central province of Ninh Thuan and is expected to be operational in 2025.
Vietnam will assess a feasibility study and technology this year and open bidding on design and construction next year, he added.
The delay followed a suggestion by Yukiya Amano, chief of the International Atomic Energy Agency that Vietnam not rush to build a plant.
The project was approved by the Vietnamese parliament in 2009. The country plans to build eight nuclear plants to produce a combined 16,000 megawatts.