Functional Safety 2016

Challenge for SIL assessment - Human error rates

Applicability of generic human error rate data

[2]

[3]

depends on the adequacy of

many factors including:

• How often the task is completed (familiarity)

• Operator Training and Competence

• The length and complexity of the operation

• Operator’s stress level during the procedure

• Whether written Operator Procedures have been validated and whether they

include a sign-off provision

• Whether the procedure includes Supervision/checking by 2nd person

Ref. [2] Swainn & Guttman - Handbook of Human Reliability Analysis

[3] CCPS Guidelines for Initiating Events and IPLs in LOPA