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Investigation of IC components at Kernkraftwerk M hleberg during operation and outage with the aid of signal analysis. P

2. . 350 signals are measured every cycleThe analysis started in 1994The analysis results are stored in a data base called SensBaseThe nuclear power inspectorate in Switzerland has accepted an extended calibration interval as a result of the analysis. 3. Signal analysis of I

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Investigation of IC components at Kernkraftwerk M hleberg during operation and outage with the aid of signal analysis. P

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    1. Investigation of I&C components at Kernkraftwerk Mhleberg during operation and outage with the aid of signal analysis. Part I Bengt-Gran Bergdahl GSE Power Systems AB, Sweden bengt-goran.bergdahl@gses.se

    2. 2 350 signals are measured every cycle The analysis started in 1994 The analysis results are stored in a data base called SensBase The nuclear power inspectorate in Switzerland has accepted an extended calibration interval as a result of the analysis

    3. 3 Signal analysis of I&C components at KKM, a GE type BWR in Switzerland An independent method to observe dynamic deviations in the components like e.g. Filtering in I&C response time Transmitter errors Increased signal noise in the I&C component Static deviations Changes in I&C calibration can also be observed with the analysis

    4. 4 Storage of analysis data in SensBase Short time series ~30 seconds APSD (Auto Power Spectral Density) Histogram with Mean Value, Standard Deviation, Skewness and Kurtosis Time constant, estimated with an identified model of the component Multiple sensor information in the time domain with Gain, Offset and Amplitude Ratio

    5. 5

    6. 6 23 different systems each with a GUI in SensBaseTM

    7. 7 Gain, Offset and Amplitude ratio for 4 pairs of reactor pressure sensors. MP34B2 was taken to service in year 2000. Observe that the parameters are normal in year 2001. Transmitter error!

    8. 8 Process identification

    9. 9 Reactor water level instrument in a BWR

    10. 10

    11. 11 A2, B2 inputs and B-U01 output, analyzed with a MAR (Multiple Auto Regressive) Model

    12. 12 Time constants for the summation and isolation amplifier units

    13. 13 Observed deviations at KKM with SensBase technique.

    14. 14 Turbine controllers at KKM

    15. 15 Test of the control system in closed loop

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