Regulations concerning implementation and use of risk analysis in the petroleum activity are in effect in Norway since February 1, 1991. The regulations specify a number of requirements on the operator's internal control system including that safety goals and acceptance criteria shall be defined, that risk analyses shall be applied in the identification and assessment of accident risks and that risk reducing measures shall be implemented when necessary to meet the criteria.

The paper examines the implementation of the "Risk analysis regulations" in the control of occupational accidents in design. It is based on results and experiences from the application of various methods of risk analysis during the design of a fixed offshore installation. A risk analysis method has been developed for the purpose of verifying complience with acceptance criteria concerning the expected accident frequency rate. Theoretical and methodological problems are discussed in relation to these results and experiences.

It is concluded that the basic requirements of the "Risk analysis regulations" are possible to meet. Its implementation requires the use of a combination of risk analysis methods and access to adequate experience data. Subject-matter expert judgement must be accepted as an integral part of the analyses.

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