Computation of consequence measures of piping component failures

Research output: Book/ReportReportProfessional

Abstract

In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their structural 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 associated consequences.

This report focuses on estimating the consequences of the piping component failures. Conditional core damage probability (CCDP) and conditional large early release probability (CLERP) are used as the consequence measures. It is demonstrated how CCDP and CLERP values of piping component failures can be calculated automatically using the RI-ISI feature of the probabilistic risk assessment (PRA) software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of the piping component failures without complicating the PRA model itself. Special focus is on the computation of the CLERP values for piping failures affecting severe accident management.
Original languageEnglish
PublisherVTT Technical Research Centre of Finland
Number of pages27
Publication statusPublished - 18 Sep 2018
MoE publication typeNot Eligible

Publication series

NameResearch Report
PublisherVTT
No.VTT-R-03666-16

Fingerprint

piping
risk assessment
damage
nuclear power plant
accident
pipe
safety
software
inspection service
modeling

Keywords

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

Cite this

Tyrväinen, T. (2018). Computation of consequence measures of piping component failures. VTT Technical Research Centre of Finland. VTT Research Report, No. VTT-R-03666-16
Tyrväinen, Tero. / Computation of consequence measures of piping component failures. VTT Technical Research Centre of Finland, 2018. 27 p. (VTT Research Report; No. 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 structural 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 associated consequences.This report focuses on estimating the consequences of the piping component failures. Conditional core damage probability (CCDP) and conditional large early release probability (CLERP) are used as the consequence measures. It is demonstrated how CCDP and CLERP values of piping component failures can be calculated automatically using the RI-ISI feature of the probabilistic risk assessment (PRA) software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of the piping component failures without complicating the PRA model itself. Special focus is on the computation of the CLERP values for piping failures affecting severe accident management.",
keywords = "risk-informed in-service-inspections, probabilistic risk assessment, nuclear safety, pipe",
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Tyrväinen, T 2018, Computation of consequence measures of piping component failures. VTT Research Report, no. VTT-R-03666-16, VTT Technical Research Centre of Finland.

Computation of consequence measures of piping component failures. / Tyrväinen, Tero.

VTT Technical Research Centre of Finland, 2018. 27 p. (VTT Research Report; No. VTT-R-03666-16).

Research output: Book/ReportReportProfessional

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AB - In-service inspections are applied to safety important pipe components in nuclear power plants (NPPs) to ensure their structural 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 associated consequences.This report focuses on estimating the consequences of the piping component failures. Conditional core damage probability (CCDP) and conditional large early release probability (CLERP) are used as the consequence measures. It is demonstrated how CCDP and CLERP values of piping component failures can be calculated automatically using the RI-ISI feature of the probabilistic risk assessment (PRA) software FinPSA. The RI-ISI feature enables detailed modelling of the consequences of the piping component failures without complicating the PRA model itself. Special focus is on the computation of the CLERP values for piping failures affecting severe accident management.

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Tyrväinen T. Computation of consequence measures of piping component failures. VTT Technical Research Centre of Finland, 2018. 27 p. (VTT Research Report; No. VTT-R-03666-16).