[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5516/NET.2009.41.6.849

AN OVERVIEW OF RISK QUANTIFICATION ISSUES FOR DIGITALIZED NUCLEAR POWER PLANTS USING A STATIC FAULT TREE

Kang, Hyun-Gook (Korea Atomic Energy Research Institute)
Kim, Man-Cheol (Korea Atomic Energy Research Institute)
Lee, Seung-Jun (Korea Atomic Energy Research Institute)
Lee, Ho-Jung (Korea Atomic Energy Research Institute)
Eom, Heung-Seop (Korea Atomic Energy Research Institute)
Choi, Jong-Gyun (Korea Atomic Energy Research Institute)
Jang, Seung-Cheol (Korea Atomic Energy Research Institute)

Publication Information

Nuclear Engineering and Technology / v.41, no.6, 2009 , pp. 849-858 More about this Journal

Abstract

Risk caused by safety-critical instrumentation and control (I&C) systems considerably affects overall plant risk. As digitalization of safety-critical systems in nuclear power plants progresses, a risk model of a digitalized safety system is required and must be included in a plant safety model in order to assess this risk effect on the plant. Unique features of a digital system cause some challenges in risk modeling. This article aims at providing an overview of the issues related to the development of a static fault-tree-based risk model. We categorize the complicated issues of digital system probabilistic risk assessment (PRA) into four groups based on their characteristics: hardware module issues, software issues, system issues, and safety function issues. Quantification of the effect of these issues dominates the quality of a developed risk model. Recent research activities for addressing various issues, such as the modeling framework of a software-based system, the software failure probability and the fault coverage of a self monitoring mechanism, are discussed. Although these issues are interrelated and affect each other, the categorized and systematic approach suggested here will provide a proper insight for analyzing risk from a digital system.

Keywords

PRA; Risk; Fault Tree; Digital System; Safety-Critical; Digital;

Citations & Related Records

Times Cited By KSCI : 3 (Citation Analysis)
Times Cited By Web Of Science : 2 (Related Records In Web of Science)
Times Cited By SCOPUS : 9

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