What is a reliable source of failure rate data?

• A. Plant-specific maintenance records
• B. IEC61508, Part 2
• C. Industry safety audits
• D. Both answers a and b

Answer: (C)

A reliable source of failure rate data is the IEC61508, Part 2. This standard provides comprehensive guidance on functional safety and includes information relevant to the reliability and failure rates of safety-related systems. Specifically, it offers a framework for determining failure rates based on systematic reviews of industry practices, component reliability data, and methodologies for assessing safety functions. These details are crucial for establishing quantifiable measures that organizations can use to enhance their safety protocols.

While plant-specific maintenance records can provide valuable insights tailored to specific operations, they may not offer generalized failure rate data that applies across various installations or components. Industry safety audits, although beneficial for assessing compliance and identifying risks, generally do not provide the rigorous quantitative failure rate data that IEC61508 serves to standardize.

Therefore, the inclusion of IEC61508, Part 2 as a source of failure rate data highlights its importance as an authoritative and researched-based resource, while recognizing that plant-specific records and industry audits serve different purposes in maintenance and safety evaluation contexts.