Table 4.16 Uncertainty Index for Health and Safety Issues The risks resulting from electricity generation differ among the technologies not only in the magnitude but also in the manner in which impacts occur. These distinctions affect societal perceptions of the acceptability of each risk and need to be preserved in the analysis. Catastrophic events constitute a prime example of the need for categorization. Because of the engineered low risk of occurrence for these events, the number of expected deaths per year, averaged over the lifetime of the plant, may be lower than that from more probable low-impact events, but the public perception of the significance of these potential events may critically affect the viability of a technology. The various impact categories utilized in the analysis are listed in Table 4.17. 4.3.3 Discussion of Results The results of the quantitative risk analysis are summarized in Table 4.18 and Figs. 4.29-4.31. A detailed analysis of each issue considered is provided in Tables 4.19-4.23. The major unquantified issues are listed in Table 4.24. The following is a discussion of major features from those results. Occupational Risks of the Construction Phase. For each unit value of direct industrial output required to supply'components for each of the energy systems, an additional indirect in the range of 0.5-0.9 units from other industries is required. This significant requirement for indirect industrial output results in a significant addition to the average number of occupational fatalities per unit of component production, as illustrated in Fig. 4.29. The combined direct and indirect fatalities per unit of component requirement is within the same range for all the technologies, and, as a result, the total
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