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April 29, 2024 – Georgia Power declared today that Plant Vogtle Unit 4 has entered commercial operation and is now serving customers and the State of Georgia.
Vogtle 4 initial criticality refers to the moment when the nuclear reactor at the Vogtle Electric Generating Plant Unit 4 achieves a self-sustaining nuclear fission reaction for the first time. This is a crucial milestone in the commissioning process of a new nuclear reactor, indicating that the reactor is ready for further testing and eventual operation.
Achieving initial criticality is a carefully monitored process that is conducted under strict safety protocols. It indicates that the reactor is capable of sustaining a controlled nuclear reaction, which is essential for safe operation. Comprehensive safety measures are in place to prevent any accidents, and the reactor will continue to undergo rigorous testing and evaluation before it is allowed to operate at full power.
Before reaching initial criticality, a series of tests and preparations are conducted. These include the construction and installation of reactor components, extensive safety inspections, and the performance of various system tests. Additionally, operators must ensure that all safety systems are operational and that the reactor is properly fueled and configured for the initial fission reaction.
Vogtle 4's initial criticality is similar to other new nuclear reactors in that it marks a significant step in the commissioning process. However, each reactor design and construction project has unique challenges and timelines. Vogtle 4 is notable for being one of the first new reactors built in the U.S. in decades, utilizing advanced technology and design features aimed at improving safety and efficiency.
After initial criticality is achieved, the reactor will undergo a series of tests to confirm its operational capabilities and safety systems. This includes gradually increasing power levels while monitoring the reactor's performance. Once all tests are successfully completed and regulatory approvals are obtained, the reactor can begin commercial operation, supplying electricity to the grid.