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white rose oilfield development application - Husky Energy

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Statistical estimates of probable loss of life for both the FPSO and semi-submersible options arepredicted to be primarily related to loss of hydrocarbon containment (fire, explosion and relatedevacuation fatalities). Other possible contributions to probable loss of life on both the FPSO and semisubmersibleoptions are a helicopter crash, ship collision or structural failure. Highest risks relate to lossof hydrocarbon containment or helicopter crash. However, in both cases, the statistical risks are low andwithin parameters of other existing offshore operations.7.2.2.3 Environmental RiskThe frequency of occurrence for a significant oil spill (that is, a spill exceeding 8 m 3 (50 barrels)) issimilar for both the FPSO and semi-submersible options, with the estimated frequency for both optionsbeing well within the specified target levels of safety for the project.7.2.2.4 Safety Function ImpairmentImpairment frequencies have been calculated for the temporary safe refuge, with the estimatedfrequency being lower than the target safety level. Impairment of the refuge is minimized by placing afirewall between the temporary safe refuge and the process modules.Impairment frequencies for the primary structure, escape routes and means of evacuation have not beenquantified at this stage due to the many design uncertainties that remain. The requirements of the safetyfunction impairment criteria for these features will all be met during the detailed design stage throughappropriate selection of materials, components and design features.White Rose DA Project Summary • January 2001 Page 108

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