Predicting Wear: How To Use Pass 2 Analysis
The documentation of a Pass 2 analysis can have a wide range of levels of formality but should include the following:
- A table of all inspections in the model includes whether the inspection is included in the run calibration and, if not, the reason for exclusion.
- A section to document any changes to WRA Run Definitions, including moving lines from one run into another or a change in the analysis method.
- Documentation with the following information for each run (Table form works best for comparison between runs):
• Number of inspections used for calibration
• LCF
• Number of Parallel Trains Inspected vs. Total Number of Parallel Trains
• Ranking of Very Good, Good, Moderate, or Poor for Parallel Train Coverage
• Number of Geometry Types Inspected vs. Total Number of Geometry Types
• Ranking of Very Good, Good, Moderate, or Poor for Geometry Coverage
• Ranking of Very Good, Good, Moderate, or Poor for Inspection Correlation
• Whether or not a run can be considered calibrated
• For calibrated runs, comment on any of the above fields that do not meet calibration criteria and why the run can still be considered calibrated.
• For non-calibrated runs, comment on why the run is not calibrated and what measures are required for calibration.
Additionally, it’s useful to include:
• The figure of merit calculation for run correlation for comparison with CHUG Position Paper No. 17
• Total number of Control Valves Inspected vs. Total number of Control Valves in the run
• Total number of Orifices Inspected vs. Total number of Orifices in the run
• A list of all components with a low or negative predicted Time to Tcrit documenting whether or not the component is to be inspected at the next outage and why
To learn more about using Pass 2 analysis and calibration rates, talk with the experts at GSE or visit https://gses.com/balance-of-plant-bop/
