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Risk Anaiysis applied to Subsea Pipeline Engineering 279

Acceptance Crinria

Identification of
initiating events

analysis

Cause analysis
(qualitative)

analysis

Consequence analysis
(refined)

Is risk
acceptable?

Acceptable
Desippmrocedure

Figure 16.1 Risk Analysis Methodology.
This chapter will outline the various techniques that are available to fulfil the requirements of
the risk analysis stages.

16.2 Acceptance Criteria

16.2.1 General
The acceptance criteria are distinctive, normative formulations against which the risk
estimation can be compared. Most regulatory bodies give acceptance criteria either
qualitatively or quantitatively. The NPD regulation states the following:

In order to avoid or withstand accidental events, the operator shall define safety objectives
to manage the activities.
The operator shall define acceptance criteria before risk analysis is carried out.
Risk analysis shall be carried out in order to identify the accidental events that may occur
in the activities and the consequences of such accidental events for people, for the
environment and for assets and financial interest.