Critical issues pertaining to the evaluation of passive system reliability

2010 ◽  
Author(s):  
A. K. Nayak ◽  
Vikas Jain ◽  
D. Saha
Keyword(s):  
System Reliability ◽  
Passive System ◽  
Critical Issues

scholarly journals Advanced Reactor Passive System Reliability Demonstration Analysis for an External Event

2017 ◽  
Vol 49 (2) ◽  
pp. 360-372 ◽  
Author(s):  
Matthew Bucknor ◽  
David Grabaskas ◽  
Acacia J. Brunett ◽  
Austin Grelle
Keyword(s):  
System Reliability ◽  
Passive System ◽  
External Event ◽  
Demonstration Analysis

A Methodology for the Integration of Passive System Reliability With Success Criteria in a Probabilistic Framework for Advanced Reactors

2016 ◽  
Author(s):  
Acacia J. Brunett ◽  
Dave Grabaskas ◽  
Matthew Bucknor ◽  
Stefano Passerini
Keyword(s):  
System Reliability ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Passive System ◽  
Passive Systems ◽  
Success Criteria ◽  
Mission Success ◽  
Reliability Method ◽  
High Level ◽  
The Impact

GE Hitachi Nuclear Energy (GEH) and Argonne National Laboratory are currently engaged in a joint effort to modernize and develop probabilistic risk assessment (PRA) techniques for advanced non-light water reactors. At a high level, the primary outcome of this project will be the development of next-generation PRA methodologies that will enable risk-informed prioritization of safety- and reliability-focused research and development, while also identifying gaps that may be resolved through additional research. A subset of this effort is the development of PRA methodologies that can be used for the determination of passive system reliability while integrating quantitative success criteria into the risk analysis framework. An updated passive system reliability approach has been developed for utilization in the PRISM PRA that systematically characterizes the impact of passive safety systems on key success criteria. This methodology is derived from the Reliability Method for Passive Systems (RMPS), but is refined to explicitly include consideration of overall mission success through satisfaction of success criteria, rather than only focusing on the passive system itself. This paper provides details on the integrated methodology, focusing on the interface between passive system reliability and success criteria. Specific examples for the passive systems/features of interest, RVACS and inherent reactivity feedback, are included. Additionally, aspects of the integrated passive system and success criteria methodology as they relate to the ASME/ANS Non-LWR PRA Standard are identified and discussed.

Passive System Reliability Modeling of the Combination of Failure Modes

2016 ◽  
Author(s):  
Luciano Burgazzi
Keyword(s):  
Reliability Analysis ◽  
Failure Mode ◽  
System Reliability ◽  
Probabilistic Models ◽  
Failure Modes ◽  
Natural Circulation ◽  
Heat Transfer Process ◽  
Passive System ◽  
Modes Of Failure ◽  
Degradation Failure

Innovative probabilistic models to extend the reliability analysis of passive systems under different modes of failure are proposed. The prevailing failure mode on the system can be predicted through the failure probability assessment on each specific mode. A realistic case is presented to analyze a passive system with two kinds of major failure modes — natural circulation stoppage due to e.g., isolation valve closure (a catastrophic failure) and heat transfer process degradation due to e.g., deposit thickness on component surfaces (a degradation failure). Modeling of each individual failure mode together with system reliability analysis is presented and results are discussed.

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