Safety Critical Element Management Manual

1. Identify SCEs and performance standards
EP 2009-9009
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1. Identify SCEs and performance standards
The purpose of this section is to ensure that all hardware barriers which are necessary to control Major Hazards, are identified and their SCEs, associated performance standards and performance assurance tasks are defined.
The process starts during the Asset’s Select phase, in which the EP best practice (also known as generic) bow-ties are used for preliminary selection of SCEs. This is followed by an initial outlining of their performance requirements, which should be based on generic performance standards (to establish Technical Integrity) and the Operate phase performance standard templates (to safeguard Technical
Integrity). The results are incorporated in the Technical
Integrity Plan, which is a Select phase deliverable. At this time, the design specific values for the performance requirements will only be defined to the extent necessary to assure alignment with Operation’s needs, which are established through ORA activities.
During the Asset’s Define phase, the basis of design (BoD) is developed, incorporating and refining key criteria from the performance standards. The BoD is used during the FEED to develop a conceptual design that will be developed further as the project goes through subsequent phases.
During the project Execute phase, the detailed design specifications are developed and the SCE Operate phase performance standards are completed with the Asset specific performance values. These SCE Operate phase performance standards are used for acceptance during commissioning and are subsequently maintained during the Asset’s Operate phase.
During an Asset’s Operate phase it maybe necessary to improve the SCE identification and establish or update performance standards. In this case, the starting point is the
HSE casein which the SCEs and their outline performance requirements should be identified. Risk and Reliability Management (RRM) is a suite of risk assessment processes which establish the optimised approach to maintaining and inspecting hardware to meet the business objectives. This combines the Reliability Centred
Maintenance (RCM), Risk Based Inspection (RBI) and
Instrumented Protective Function (IPF) methodologies. The process is described in more detail in the Risk and Reliability
Management Process Guide (EP The end product of this section is a package of approved
SCEs and Operate phase performance standards with performance assurance tasks and acceptance criteria that can be used as a basis for developing or adjusting planned maintenance routines.

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