Proceedings of the ASME 2021
ASME 2021 Power Conference
July 20-22, 2021, Online, Virtual
Paper ID: POWER2021CONFERENCE-64854
Occupational Radiation Exposure must be kept As Low As Reasonably Achievable (ALARA). Operational, economic, and social factors need to be taken into account. Fast purging of a Hydrogen Cooled generator can be achieved through the means of a system that increases the rate of carbon dioxide vaporization. This system has been successfully utilized at two nuclear plants in the USA: Vogtle Electric Generating Plant and Joseph M. Farley Nuclear Generating Plant. The installation reduced the purging procedure by approximately 11 hours from the typical purging time. This was accomplished by increasing the flow of Carbon Dioxide, monitoring the pressure and gas purity monitoring.
The generator was also able to be brought back online more rapidly when the air was replaced with carbon dioxide in 1 hour and 6 minutes. While the Vogtle and Farley Plants are not Boiling Water Nuclear Reactors, this technology clearly demonstrates that exposure meeting the requirements of ALARA can be achieved with the most significant benefit achieved on Boiling Water Nuclear Reactors.
Fast purging operations are described, and test runs from Plant Vogtle are presented and additional benefits of the purging are discussed. These include outage time reduction and risk mitigation.
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