Computation of consequences of piping component failures in PRA software

Research output: Book/ReportReport

Abstract

In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their reliability. In risk-informed in-service inspections (RI-ISI), these inspections are planned according to risk importance of piping components. The quantitatively computed risk of a piping component combines the probability of the failure and the consequences of the failure. This report focuses on estimating the consequence of piping component failures. A typical measure for the consequences is conditional core damage probability (CCDP), and it can be calculated from a probabilistic risk assessment (PRA) model of a NPP. However, computation of CCDP values of piping component failures has not been automated in PRA software, such as FinPSA, and requires typically additional processing of the model because all piping component failures are not included in the PRA model explicitly. This report introduces a prototype of a new RI-ISI feature which calculates CCDP values of piping component failures in PRA software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of piping component failures without complicating the PRA model itself. The CCDP values of all piping component failures can be calculated automatically at once in the same RI-ISI table based on the results of the PRA model.
Original languageEnglish
PublisherVTT Technical Research Centre of Finland
Number of pages17
Publication statusPublished - 2016
MoE publication typeD4 Published development or research report or study

Publication series

SeriesVTT Research Report
VolumeVTT-R-03666-16

Fingerprint

Risk assessment
Inspection
Nuclear power plants
Pipe
Processing

Keywords

  • risk-informed in-service-inspections
  • probabilistic risk assessment
  • nuclear safety
  • pipe

Cite this

Tyrväinen, T. (2016). Computation of consequences of piping component failures in PRA software. VTT Technical Research Centre of Finland. VTT Research Report, Vol.. VTT-R-03666-16
Tyrväinen, Tero. / Computation of consequences of piping component failures in PRA software. VTT Technical Research Centre of Finland, 2016. 17 p. (VTT Research Report, Vol. VTT-R-03666-16).
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abstract = "In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their reliability. In risk-informed in-service inspections (RI-ISI), these inspections are planned according to risk importance of piping components. The quantitatively computed risk of a piping component combines the probability of the failure and the consequences of the failure. This report focuses on estimating the consequence of piping component failures. A typical measure for the consequences is conditional core damage probability (CCDP), and it can be calculated from a probabilistic risk assessment (PRA) model of a NPP. However, computation of CCDP values of piping component failures has not been automated in PRA software, such as FinPSA, and requires typically additional processing of the model because all piping component failures are not included in the PRA model explicitly. This report introduces a prototype of a new RI-ISI feature which calculates CCDP values of piping component failures in PRA software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of piping component failures without complicating the PRA model itself. The CCDP values of all piping component failures can be calculated automatically at once in the same RI-ISI table based on the results of the PRA model.",
keywords = "risk-informed in-service-inspections, probabilistic risk assessment, nuclear safety, pipe",
author = "Tero Tyrv{\"a}inen",
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year = "2016",
language = "English",
series = "VTT Research Report",
publisher = "VTT Technical Research Centre of Finland",
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Tyrväinen, T 2016, Computation of consequences of piping component failures in PRA software. VTT Research Report, vol. VTT-R-03666-16, VTT Technical Research Centre of Finland.

Computation of consequences of piping component failures in PRA software. / Tyrväinen, Tero.

VTT Technical Research Centre of Finland, 2016. 17 p. (VTT Research Report, Vol. VTT-R-03666-16).

Research output: Book/ReportReport

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AB - In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their reliability. In risk-informed in-service inspections (RI-ISI), these inspections are planned according to risk importance of piping components. The quantitatively computed risk of a piping component combines the probability of the failure and the consequences of the failure. This report focuses on estimating the consequence of piping component failures. A typical measure for the consequences is conditional core damage probability (CCDP), and it can be calculated from a probabilistic risk assessment (PRA) model of a NPP. However, computation of CCDP values of piping component failures has not been automated in PRA software, such as FinPSA, and requires typically additional processing of the model because all piping component failures are not included in the PRA model explicitly. This report introduces a prototype of a new RI-ISI feature which calculates CCDP values of piping component failures in PRA software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of piping component failures without complicating the PRA model itself. The CCDP values of all piping component failures can be calculated automatically at once in the same RI-ISI table based on the results of the PRA model.

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Tyrväinen T. Computation of consequences of piping component failures in PRA software. VTT Technical Research Centre of Finland, 2016. 17 p. (VTT Research Report, Vol. VTT-R-03666-16).