Abstract
Increasing use of passive safety systems also increases the need for
advanced methods of analyzing their
reliability. Passive components work in a variety of ways. IAEA classifies
these components and systems based on the level of passivity they exhibit.
Reliability analysis of passive components relying mostly on physical
phenomena require a combination of physics modeling and probabilistic methods.
Challenges are to identify the mechanisms that can degrade or otherwise
affect the systems stated safety function and the sources of uncertainty.
Sources of uncertainty can be the geometric properties and layout of the
system, material properties, design parameters and phenomenological analysis.
A pilot case study of simulating a passive containment cooling system (PCCS)
using MELCOR is applied within a simplified passive systems reliability
framework. The aim of the framework is to explicitly state the interactions
and information flow between deterministic physics modeling and probabilistic
risk assessments, and the uncertainties related to them. The framework
includes identification of main hazards, main sources of uncertainty both in
the input data and the models, propagation of the uncertainties in physical
models and finally the inclusion of the reliability assessment into the
probabilistic risk analysis (PRA) model. The framework is partly based on a
case study on a passive containment cooling system performed for this project.
This paper includes the main results and lessons learned from the case study.
Original language | English |
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Title of host publication | Proceedings of the 11th International Probabilistic Safety Assessment and Management Conference & The Annual European Safety and Reliability Conference |
Subtitle of host publication | PSAM11 ESREL 2012 |
Publisher | Curran Associates Inc. |
Pages | 2778-2785 |
Volume | 4 |
ISBN (Print) | 978-1-62276-436-5 |
Publication status | Published - 2012 |
MoE publication type | A4 Article in a conference publication |
Event | 11th International Probabilistic Safety Assessment and Management Conference and The Annual European Safety and Reliability Conference, PSAM11 & ESREL 2012 - Helsinki, Finland Duration: 25 Jun 2012 → 29 Jun 2012 |
Conference
Conference | 11th International Probabilistic Safety Assessment and Management Conference and The Annual European Safety and Reliability Conference, PSAM11 & ESREL 2012 |
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Country/Territory | Finland |
City | Helsinki |
Period | 25/06/12 → 29/06/12 |
Keywords
- probabilistic risk analysis (PRA)
- passive systems
- passive containment cooling system (PCCS)