Realistic Basic ALARP Diagram Following is a graphical representation of an exceedance or FN curve. Representative Shape of a Typical FN Curve A mathematical property of FN curves is that they are either flat or sloping downward as N increases but never upward sloping. An FN curve is typically shown on graphing paper with logarithmic scales on both the vertical and horizontal axes. An FN curve can be either derived from empirical accident data or represented by probabilistic models, which in turn are usually based on empirical data. Since an FN curve represents the potential physical risk to society at a fixed point in time, an FN curve can change shape or shift based on any circumstances that affect the calculation of risk. When an FN curve is constructed with the same units of measurement as an ALARP diagram, the
Realistic Basic ALARP Diagram Following is a graphical representation of an exceedance or FN curve. Representative Shape of a Typical FN Curve A mathematical property of FN curves is that they are either flat or sloping downward as N increases but never upward sloping. An FN curve is typically shown on graphing paper with logarithmic scales on both the vertical and horizontal axes. An FN curve can be either derived from empirical accident data or represented by probabilistic models, which in turn are usually based on empirical data. Since an FN curve represents the potential physical risk to society at a fixed point in time, an FN curve can change shape or shift based on any circumstances that affect the calculation of risk. When an FN curve is constructed with the same units of measurement as an ALARP diagram, the