Multivariate analysis of critical parameters influencing the reliability of thermal-hydraulic passive safety system
| Autor: | Zhijian Zhang, Samuel Abiodun Olatubosun |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Passive systems
Multivariate statistics Multivariate analysis Computer science 020209 energy System safety Probability density function 02 engineering and technology Covariance lcsh:TK9001-9401 complex mixtures 030218 nuclear medicine & medical imaging Reliability engineering Thermal hydraulics 03 medical and health sciences 0302 clinical medicine Nuclear Energy and Engineering Inherent safety 0202 electrical engineering electronic engineering information engineering lcsh:Nuclear engineering. Atomic power |
| Zdroj: | Nuclear Engineering and Technology, Vol 51, Iss 1, Pp 45-53 (2019) |
| ISSN: | 1738-5733 |
| Popis: | Thermal-hydraulic passive safety systems (PSSs) are incorporated into many advanced reactor designs on the bases of simplicity, economics and inherent safety nature. Several factors among which are the critical parameters (CPs) that influence failure and reliability of thermal-hydraulic (t-h) passive systems are now being explored. For simplicity, it is assumed in most reliability analyses that the CPs are independent whereas in practice this assumption is not always valid. There is need to critically examine the dependency influence of the CPs on reliability of the t-h passive systems at design stage and in operation to guarantee safety/better performance. In this paper, two multivariate analysis methods (covariance and conditional subjective probability density function) were presented and applied to a simple PSS. The methods followed a generalized procedure for evaluating t-h reliability based on dependency consideration. A passively water-cooled steam generator was used to demonstrate the dependency of the identified key CPs using the methods. The results obtained from the methods are in agreement and justified the need to consider the dependency of CPs in t-h reliability. For dependable t-h reliability, it is advisable to adopt all possible CPs and apply suitable multivariate method in dependency consideration of CPs among other factors. Keywords: Reliability, Thermal-hydraulic passive systems, Critical parameters, Multivariate methods, Dependency consideration |
| Databáze: | OpenAIRE |
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