United States Nuclear Regulatory Commission - Protecting People and the Environment

Greg Halnon

Mr. Greg Halnon is the FirstEnergy Vice President Regulatory Affairs & Lab Services and President of GPU Nuclear.


Mr. Halnon began his career in 1981 as a system engineer for the fossil fleet at Florida Power Corporation in St. Petersburg Florida. He later moved into nuclear as a system engineer for the Crystal River Nuclear Plant in HVAC and mechanical-thermal systems. Mr. Halnon has over 30 years in engineering, operations, regulatory affairs, quality, and line management of nuclear power stations. He has held two Senior Reactor Operator licenses and is a registered professional mechanical engineer in the state of Florida. In his career, Mr. Halnon has served as a plant general manager, general engineering manager and quality director at various nuclear units and fleets. He heads the Small Modular Reactor and new nuclear opportunity efforts for FirstEnergy and served as the Project Director for the mPower SMR Industry Team and Consortium. He presently serves as the chief nuclear regulatory officer for First Energy Corp. He is responsible for the care of the Three Mile Island Unit 2 decommissioning process and is responsible for the Beta Laboratory business unit for FirstEnergy which includes metallurgical, l&C, environmental and oil monitoring as well as fire safety. He also is serving the industry as the National RUG chairman since 2012.


Mr. Halnon received his bachelor of science in mechanical engineering from the University of Central Florida after doing undergraduate agricultural technology research at Virginia Tech. He completed the INPO Senior Plant Managers Professional Development in 1997. He is a qualified ABET accreditation evaluator and a life member of the American Nuclear Society.

Page Last Reviewed/Updated Tuesday, May 24, 2016