Laser Peening Applications for Next Generation of Nuclear Power Facilities

Abstract

Laser Peening Applications for Next Generation of Nuclear Power Facilities Generation of electricity by using nuclear power can assist in achieving goals of reduced greenhouse gas emissions. Increased safety and reliability are necessary attributes of any future nuclear power plant. High pressure, hot water and radiation contribute to operating environments where Stress Corrosion Cracking (SCC) and hydrogen embrittlement can lead to potential component failures. For the next generation of Nuclear Reactor facilties it would be a significant advantage if the critical subsystems and components could be made less susceptible to fatigue, SCC and radiation embrittlement. These types of components include cladding material, gears, bearings, housings, welded assemblies, fittings, pipes, flanges, vessel penetrations, nuclear waste storage canisters; and even the non-radioactive subsystems, such as the airfoils of highly stressed rotating steam turbine components. Laser Peening has repeatedly demonstrated its ability to extend the life and improve fatigue strength on a wide variety of metal alloys. It is currently being utilized extensively by the commercial aviation industry to prevent FOD fatigue and fretting fatigue of highly stressed rotating turbine engine components and more recently for gas and steam turbine electric power generation fatigue applications.. In addition to presenting data on the fatigue and SCC benefits of laser peening in a wide range of metals, we will present specific data showing the benefits of Laser Peening to mitigate SCC in metal alloys such as Alloy 600 and C22 as utilized in the Nuclear Power Industry.