11th International Conference on CANDU® Maintenance and Nuclear Components - 2017 Oct. 01-04

Presented at:
11th International Conference on CANDU® Maintenance and Nuclear Components
2017 Oct. 01-04
Toronto, ON Canada
Session Title:
Maintenance Management

M. Langenstein (BTB Jansky GmbH)
A. Jansky (BTB Jansky GmbH)
D. Walker (BTB Jansky GmbH)


The large quantities of measurement information gathered throughout the Primary, Secondary and Cooling Water processes of a nuclear plant make the closing of the mass and energy balance nearly impossible without the help of advanced tools. The BTB Jansky ProcessPLUS® Online System uses all redundant measurements within the process to continuously close mass and energy balances. The VDI 2048 standard ensures that the calculated results meet strict quality control standards thereby yielding the most accurate representation, with the lowest uncertainty, of plant conditions. All measured values within the plant are subject to distortions caused by avoidable, systematic or random errors. The Gaussian correction principle provides the optimum method of accounting for these measurement errors using proven mathematical/statistical methods. Fundamental to the solution is use of all available measured variables, including redundant measurements, along with the respective variances and covariances. In addition the calculated true values of the measured variables must meet the boundary conditions of conservation of mass, energy and material balances. VDI 2048 specifies the quality control criteria that must be met to ensure an accurate representation of both component and process behaviour. The high quality data obtained represents the “true” plant process state with the highest confidence. This data can then be used as the reference for differentiating between instrument drift and process anomalies. Component performance is determined by quantification of internal leakages, non-condensable gases, fouling, etc. Instrument drift is quantified and can be trended over time. The availability of quality assured reference data of all process variables in the Primary, Secondary and Cooling Water systems enables the plant to prioritize maintenance activities. Appropriate corrective action can be planned because the impact of problems can be accurately determined. Early detection of component degradation allows for maintenance intervention prior to failure thereby improving plant safety and availability.

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