Time-dependent probabilistic risk assessment in FinPSA

Research output: Book/ReportReportProfessional

Abstract

It has to be ensured that the risk is on an acceptable level at all times during the operation of a nuclear power plant, including different plant operation states. Probabilistic risk assessment (PRA) is mainly used to evaluate the average risk reflecting average plant conditions, but it can also be used estimate how the risk behaves as a function of time based on the expected plant conditions at different time points. Time-dependent PRA can be used to analyse maintenance and test plans, to perform risk follow-up based on past events, to monitor the current risk or to analyse seasonal variations in risk.

This report presents a new time-dependent PRA feature in FinPSA software. The user can specify events, such as maintenance activities or tests, parameter changes and configuration changes to a time line in a task file, and FinPSA automatically calculates and draws the time-dependent risk curve based on that information, existing minimal cut sets and data. More detailed analyses, e.g. computation of importance measures, can also be performed for selected time points. The time-dependent analysis is demonstrated with three simplified analysis cases.
Original languageEnglish
PublisherVTT Technical Research Centre of Finland
Number of pages26
Publication statusPublished - 18 Sep 2018
MoE publication typeNot Eligible

Publication series

NameResearch Report
PublisherVTT
No.VTT-R-04119-18

Fingerprint

Risk assessment
Nuclear power plants

Keywords

  • probabilistic risk assessment
  • time-dependent
  • Maintenance planning

Cite this

Tyrväinen, T. (2018). Time-dependent probabilistic risk assessment in FinPSA. VTT Technical Research Centre of Finland. VTT Research Report, No. VTT-R-04119-18
Tyrväinen, Tero. / Time-dependent probabilistic risk assessment in FinPSA. VTT Technical Research Centre of Finland, 2018. 26 p. (VTT Research Report; No. VTT-R-04119-18).
@book{ac7152bc0915441e90de90d0ef17d5f9,
title = "Time-dependent probabilistic risk assessment in FinPSA",
abstract = "It has to be ensured that the risk is on an acceptable level at all times during the operation of a nuclear power plant, including different plant operation states. Probabilistic risk assessment (PRA) is mainly used to evaluate the average risk reflecting average plant conditions, but it can also be used estimate how the risk behaves as a function of time based on the expected plant conditions at different time points. Time-dependent PRA can be used to analyse maintenance and test plans, to perform risk follow-up based on past events, to monitor the current risk or to analyse seasonal variations in risk.This report presents a new time-dependent PRA feature in FinPSA software. The user can specify events, such as maintenance activities or tests, parameter changes and configuration changes to a time line in a task file, and FinPSA automatically calculates and draws the time-dependent risk curve based on that information, existing minimal cut sets and data. More detailed analyses, e.g. computation of importance measures, can also be performed for selected time points. The time-dependent analysis is demonstrated with three simplified analysis cases.",
keywords = "probabilistic risk assessment, time-dependent, Maintenance planning",
author = "Tero Tyrv{\"a}inen",
note = "Project 110223",
year = "2018",
month = "9",
day = "18",
language = "English",
series = "Research Report",
publisher = "VTT Technical Research Centre of Finland",
number = "VTT-R-04119-18",
address = "Finland",

}

Tyrväinen, T 2018, Time-dependent probabilistic risk assessment in FinPSA. VTT Research Report, no. VTT-R-04119-18, VTT Technical Research Centre of Finland.

Time-dependent probabilistic risk assessment in FinPSA. / Tyrväinen, Tero.

VTT Technical Research Centre of Finland, 2018. 26 p. (VTT Research Report; No. VTT-R-04119-18).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Time-dependent probabilistic risk assessment in FinPSA

AU - Tyrväinen, Tero

N1 - Project 110223

PY - 2018/9/18

Y1 - 2018/9/18

N2 - It has to be ensured that the risk is on an acceptable level at all times during the operation of a nuclear power plant, including different plant operation states. Probabilistic risk assessment (PRA) is mainly used to evaluate the average risk reflecting average plant conditions, but it can also be used estimate how the risk behaves as a function of time based on the expected plant conditions at different time points. Time-dependent PRA can be used to analyse maintenance and test plans, to perform risk follow-up based on past events, to monitor the current risk or to analyse seasonal variations in risk.This report presents a new time-dependent PRA feature in FinPSA software. The user can specify events, such as maintenance activities or tests, parameter changes and configuration changes to a time line in a task file, and FinPSA automatically calculates and draws the time-dependent risk curve based on that information, existing minimal cut sets and data. More detailed analyses, e.g. computation of importance measures, can also be performed for selected time points. The time-dependent analysis is demonstrated with three simplified analysis cases.

AB - It has to be ensured that the risk is on an acceptable level at all times during the operation of a nuclear power plant, including different plant operation states. Probabilistic risk assessment (PRA) is mainly used to evaluate the average risk reflecting average plant conditions, but it can also be used estimate how the risk behaves as a function of time based on the expected plant conditions at different time points. Time-dependent PRA can be used to analyse maintenance and test plans, to perform risk follow-up based on past events, to monitor the current risk or to analyse seasonal variations in risk.This report presents a new time-dependent PRA feature in FinPSA software. The user can specify events, such as maintenance activities or tests, parameter changes and configuration changes to a time line in a task file, and FinPSA automatically calculates and draws the time-dependent risk curve based on that information, existing minimal cut sets and data. More detailed analyses, e.g. computation of importance measures, can also be performed for selected time points. The time-dependent analysis is demonstrated with three simplified analysis cases.

KW - probabilistic risk assessment

KW - time-dependent

KW - Maintenance planning

M3 - Report

T3 - Research Report

BT - Time-dependent probabilistic risk assessment in FinPSA

PB - VTT Technical Research Centre of Finland

ER -

Tyrväinen T. Time-dependent probabilistic risk assessment in FinPSA. VTT Technical Research Centre of Finland, 2018. 26 p. (VTT Research Report; No. VTT-R-04119-18).