As of the second quarter of 2007, Byron Nuclear Generating Station scored in the "green" in every Nuclear Regulatory Commission (NRC) inspection category but one. The NRC has four levels of inspection findings; the levels are color-coded and the colors equate with risk levels. Green inspection findings represent very low risk significance. Higher levels, from white, to yellow, to red, show increasing levels of risk. For any inspection findings greater than green, the NRC conducts follow-up inspections. Unit One scored "green" in every category, while Unit Two scored "white", a step down from "green", on the inspection of the heat removal system. The inspection covered several other significant areas, including unplanned scrams, the alert and notification system and the emergency AC power system. From 2001–2005, no inspections of Byron Nuclear Generating Station found any condition that merited a greater than "green" designation, during the same time period inspection found 71 green conditions at the Byron plant.