Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-TreeFault-Tree (ETFT) Method
Joint Authors
Liu, Mingxing
Guo, Yun
Liang, Qingzhu
Xiao, Jun
Peng, Changhong
Xiao, Peng
Source
Science and Technology of Nuclear Installations
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-11-30
Country of Publication
Egypt
No. of Pages
9
Abstract EN
The aim of this study is to verify if the reliability of a digital four-channel RPS under the design phase satisfies the specified target and to identify the weakness of system design and potential solutions for system reliability improvement.
The event-tree/fault-tree (ET/FT), which is the method used in the current probabilistic safety assessment (PSA) framework of nuclear power plants (NPPs), was adopted to developed reliability modeling for the RPS with the Top Events defined as the system failure to generate reactor trip signal and the system generating spurious trip signal.
The evaluation results indicate that the probability of the system failure on demand and the frequency of spurious trip signal generation are 1.47 × 10−6 with a 95% upper bound of 4.63 × 10−6 and 7.94 × 10−4/year with a 95% upper bound of 2.50 × 10−3/year, respectively.
The importance and sensitivity analyses were conducted and it was found that undetected unsafe common cause failures (CCFs) of signal conditioning modules (SCMs) dominate the system reliability.
Two preliminary optimization schemes relative to reducing periodic test interval and adapting two kinds of diverse SCMs were proposed.
Results of the quantitive evaluation of the schemes show that neither of them could determinedly improve the system reliability to the target level.
In the future, more detailed optimization analysis shall be required to determine a feasible system design optimization scheme.
American Psychological Association (APA)
Liang, Qingzhu& Liu, Mingxing& Xiao, Peng& Guo, Yun& Xiao, Jun& Peng, Changhong. 2020. Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-TreeFault-Tree (ETFT) Method. Science and Technology of Nuclear Installations،Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1209501
Modern Language Association (MLA)
Liang, Qingzhu…[et al.]. Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-TreeFault-Tree (ETFT) Method. Science and Technology of Nuclear Installations No. 2020 (2020), pp.1-9.
https://search.emarefa.net/detail/BIM-1209501
American Medical Association (AMA)
Liang, Qingzhu& Liu, Mingxing& Xiao, Peng& Guo, Yun& Xiao, Jun& Peng, Changhong. Reliability Assessment for a Safety-Related Digital Reactor Protection System Using Event-TreeFault-Tree (ETFT) Method. Science and Technology of Nuclear Installations. 2020. Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1209501
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1209501