ISA TR67.04.09 : 2005

Foreword
Abstract
Key Words
1 Scope
2 Purpose
3 Definitions
4 Abbreviations
5 General Discussion
6 Classifying Functions
7 Determining and Documenting Uncertainties
8 Other Considerations
9 References
Annex A - CLASSIFICATION FLOWCHART
Annex B - CLASSIFICATION EXAMPLES

ISA-TR67.04.09-2005, Graded Approaches to Setpoint Determination, offers practical methods for calculating and documenting instrument channel uncertainties and setpoints in nuclear power plants. By using a graded approach, users can allocate resources according to the safety significance of each instrument function, resulting in more efficient operations and increased plant safety. The report provides clear criteria for classifying instrument channels, examples of real-world applications and documentation practices, making it a valuable resource for engineers and technical staff responsible for safety-related instrumentation.