Presents a review of the Norwegian 'Risk Assessment of Buoyancy Loss' (RABL) project, completed in 1988. RABL was undertaken in the aftermath of the Alexander L. Kielland and Ocean Ranger accidents. RABL's stated purpose was to investigate causes of loss of buoyancy of semisubmersible drilling platforms, with the overall objective of developing an analytical procedure for consideration of buoyancy loss. RABL found that the main hazards were ship collisions, ballast system failures and blowouts. Technical recommendations were made on each of these aspects.
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