Application of System-Theoretic Process Analysis in Probabilistic Risk Assessment of a Nuclear Power Plant

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Volume Title

School of Science | Master's thesis

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Date

2024-09-06

Department

Major/Subject

Systems and Operations Research

Mcode

Degree programme

Master's Programme in Mathematics and Operations Research

Language

en

Pages

44

Series

Abstract

The production of nuclear energy involves the risk of nuclear accidents. Probabilistic risk assessment is a collection of techniques for systematic and comprehensive analysis and quantification of this risk. When the risks involved are understood, actions can be taken to improve nuclear safety. Probabilistic risk assessment of nuclear power plants requires the use of hazard analysis methods, such as failure mode and effect analysis and human reliability analysis. System-theoretic process analysis is a relatively new hazard analysis method based on system theory. This thesis studies the use of system-theoretic process analysis in the context of probabilistic risk assessment. This is achieved by conducting a case study of the refuelling pool backup cooling system of the Loviisa Nuclear Power Plant. The results of the case study are compared with the existing risk model of the system. The results of this thesis indicate that the system-theoretic processes analysis is a promising method for hazard analysis. It can be used to identify all scenarios previously identified using multiple techniques. However, the incorporation of a new method into the well-established probabilistic risk assessment methodology requires further research.

Description

Supervisor

Salo, Ahti

Thesis advisor

Purho, Tommi

Keywords

system-theoretic process analysis, probabilistic risk assessment, nuclear safety, hazard analysis, spent fuel pool, Loviisa Nuclear Power Plant

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Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202411217281

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[dipl] Perustieteiden korkeakoulu / SCI