each attribute, such as etc. are added together to determine “safety,” ”reliability,” the overall CoF score.) Impact Level Description Catastrophic (7) Fatalities: Many fatalities and life threatening injuries Severe (6) Fatalities: Few fatalities and life threatening injuries Extensive (5) Permanent/Serious Injuries and Illnesses: Many Major (4) Permanent/Serious Injuries and Illnesses: Few Moderate (3) Injuries or Illnesses: Minor to many persons Minor (2) Minor Injuries or Illnesses: Minor to few persons Negligible (1) No injury or illnesses, unreported, negligible injury As described in the Uniformity Report, the utilities currently assign LoF values to risky events using a 1 to 7 scale. The scale defines event frequencies or rates” as demonstrated below. As referred to in Section 5, the utility “arrival scales are similar to Richter scales, which are based on of magnitude.” “order According to Joint Intervenors, this 1 to 7 scale is because the “nonlinear” underlying rates” or frequencies represent changes in a way that are “hazard similar to order of magnitude differences. They observe, this scale “Moreover, means that an event occurring every 35 years has the same LoF (2) as an event occurring every 90 years, an event occurring every 3 years has the same LoF (4) as an event occurring every 9 years, and so forth, even though the mathematical probabilities of these events are different.” In essence, 1 to “the 7 LoF values do not correspond to mathematical probabilities.”
each attribute, such as “safety,” ”reliability,” etc. are added together to determine the overall CoF score.) Impact Level Description Catastrophic (7) Fatalities: Many fatalities and life threatening injuries Severe (6) Fatalities: Few fatalities and life threatening injuries Extensive (5) Permanent/Serious Injuries and Illnesses: Many Major (4) Permanent/Serious Injuries and Illnesses: Few Moderate (3) Injuries or Illnesses: Minor to many persons Minor (2) Minor Injuries or Illnesses: Minor to few persons Negligible (1) No injury or illnesses, unreported, negligible injury As described in the Uniformity Report, the utilities currently assign LoF values to risky events using a 1 to 7 scale. The scale defines event frequencies or “arrival rates” as demonstrated below. As referred to in Section 5, the utility scales are similar to Richter scales, which are based on “order of magnitude.” According to Joint Intervenors, this 1 to 7 scale is “nonlinear” because the underlying “hazard rates” or frequencies represent changes in a way that are similar to order of magnitude differences. They observe, “Moreover, this scale means that an event occurring every 35 years has the same LoF (2) as an event occurring every 90 years, an event occurring every 3 years has the same LoF (4) as an event occurring every 9 years, and so forth, even though the mathematical probabilities of these events are different.” In essence, “the 1 to 7 LoF values do not correspond to mathematical probabilities.”
165862364.docx