Flow Accelerated Corrosion (FAC) is a damage mechanism that causes metal losses and failures in water piping, HRSG tubing, steam drums, and other components composed of carbon or low alloy steel. Developing an FAC monitoring plan is a prudent practice to help avoid damage and failures. Our approach is to prioritize the risk areas within an HRSG so that a client can optimize their monitoring plan by testing the high risk areas first. This lowers field testing costs, but more importantly, helps find problem areas before failures. Prioritization is performed based on design review, performance modeling; plus our boiler design and field experience. Our FAC Risk Assessment works best in conjunction with our FAC UT Monitoring program.