Bayesian belief based model for reliability improvement of the digital reactor protection system

Hanaa Torkey; Amany S. Saber; Mohamed K. Shaat; Ayman El-Sayed; Marwa A. Shouman

doi:10.1007/s41365-020-00814-6

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Bayesian belief based model for reliability improvement of the digital reactor protection system

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2021-01-26

- Bayesian belief based model for reliability improvement of the digital reactor protection system
- Nuclear Science and Techniques Vol. 31, Issue 10, Article number: 101(2020)
- Affiliations：
  
  1.Faculty of Electronic Engineering, Menoufia University, Cairo, Egypt
  2.Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, Egypt
- Author bio：
  
  Corresponding author, amanyss@el-eng.menofia.edu.eg
- Funds：
- DOI：10.1007/s41365-020-00814-6
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Hanaa Torkey, Amany S. Saber, Mohamed K. Shaat, et al. Bayesian belief based model for reliability improvement of the digital reactor protection system. [J]. Nuclear Science and Techniques 31(10):101(2020)
DOI：

Hanaa Torkey, Amany S. Saber, Mohamed K. Shaat, et al. Bayesian belief based model for reliability improvement of the digital reactor protection system. [J]. Nuclear Science and Techniques 31(10):101(2020) DOI： 10.1007/s41365-020-00814-6.

摘要

Abstract

The digital reactor protection system (RPS) is one of the most important digital instrumentation and control (I&C) systems utilized in nuclear power plants (NPPs). It ensures a safe reactor trip when the safety-related parameters violate the operational limits and conditions of the reactor. Achieving high reliability and availability of digital RPS is essential to maintaining a high degree of reactor safety and cost savings. The main objective of this study is to develop a general methodology for improving the reliability of the RPS in NPP, based on a Bayesian Belief Network (BBN) model. The structure of BBN models is based on the incorporation of failure probability and downtime of the RPS I&C components. Various architectures with dual state nodes for the I&C components were developed for reliability sensitive analysis and availability optimization of the RPS and to demonstrate the effect of I&C components on the failure of the entire system. A reliability framework clarified as a Reliability Block Diagram (RBD) transformed into a BBN representation was constructed for each architecture to identify which one will fit the required reliability. The results showed that the highest availability obtained using the proposed method was 0.9999998. There are 120 experiments using two common component importance measures that are applied to define the impact of I&C modules, which revealed that some modules are more risky than others and have a larger effect on the failure of the digital RPS.

关键词

Keywords

Nuclear power plantsReactor protection systemBayesian belief network

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