Safety Critical Element Management Manual

SCEs and the performance assurance task level

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Shell EP 2009.9009 SCE Management Manual
POSITION PAPER 130[shell verification]

Safety Critical Element Management Manual EP 2009-9009Restricted18Figure 7: SCE Identification decision tree

SCEs and the performance assurance task level
During this step, all SCEs shall be identified in the Asset Register
(functional locations in SAP) with the relevant SCE group and flag indicating those against which the performance assurance task will be managed (examples are given in section 1.3)
• those which are not specifically linked to the performance assurance task but whose performance is tested during that task (examples maybe gas detection head, emergency light fitting, fire pump starter motor).
Note that items in the Asset Register which are below an SCE
in the hierarchy are only SCEs if their failure could directly contribute to the hardware barrier being ineffective. It is,
therefore, important that the identification of SCEs is not automatically inherited by all Assets below a given SCE.
EP 2009-9009
Restricted
17

Safety Critical Element Management Manual
EP 2009-9009
Restricted
18
Figure 7: SCE Identification decision tree
Does the system or equipment belong to any of the SCE groups shown in the HSE case bow tie?
Q1. Has the system or equipment been subject to a credible RRM assessment
Q3.
Is the system or equipment inline with the hazard scenarios in the HSE case hazard register for Major Hazards?
Q2.
Non-SCE
?
?
?
No
Yes
No
No
No
Yes
Yes
SCE
identification
SCE
SCE
ü
ü
SCE
ü
SCE
ü
SCE
ü
S-RCM CRITICALITY CLASS
S-RBI CRITICALITY CLASS
SIFPro SIL Level
Criticality is High (H)
or Extreme (E)
Criticality is High (H)
or Extreme (E)
Criticality Negligible (N),
Low (L, Medium (M) or
Medium High (MH)
Criticality Negligible (N),
Low (L, Medium (M) or
MediumHigh (MH)
Non-SCE
Non-SCE
Non-SCE
Non-SCE
SIL=>1
SIL=a1 or a2
Yes i.e. risk is ABC, DE, DE or 3E
In RAM assessment, is the system or equipment criticality at severity 5 or red risk?
Q4.

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