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Modular representation and analysis of fault trees

Journal Article:

Abstract

An analytical method to describe fault tree diagrams in terms of their modular compositions is developed. Fault tree structures are characterized by recursively relating the top tree event to all its basic component inputs through a set of equations defining each of the modulus for the fault tree. It is shown that such a modular description is an extremely valuable tool for making a quantitative analysis of fault trees. The modularization methodology has been implemented into the PL-MOD computer code, written in PL/1 language, which is capable of modularizing fault trees containing replicated components and replicated modular gates. PL-MOD in addition can handle mutually exclusive inputs and explicit higher order symmetric (k-out-of-n) gates. The step-by-step modularization of fault trees performed by PL-MOD is demonstrated and it is shown how this procedure is only made possible through an extensive use of the list processing tools available in PL/1. A number of nuclear reactor safety system fault trees were analyzed. PL-MOD performed the modularization and evaluation of the modular occurrence probabilities and Vesely-Fussell importance measures for these systems very efficiently. In particular its execution time for the modularization of a PWR High Pressure Injection System reduced fault tree was 25 times faster  More>>
Authors:
Olmos, J; Wolf, L [1] 
  1. Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Nuclear Engineering
Publication Date:
Aug 01, 1978
Product Type:
Journal Article
Reference Number:
AIX-09-414686; EDB-79-062128
Resource Relation:
Journal Name: Nucl. Eng. Des.; (Netherlands); Journal Volume: 48:2
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; HPCI; FAULT TREE ANALYSIS; PWR TYPE REACTORS; REACTOR COMPONENTS; ALGORITHMS; COMPUTER CALCULATIONS; EFFICIENCY; P CODES; PL-1 LANGUAGE; REACTOR SAFETY; RELIABILITY; COMPUTER CODES; ECCS; ENGINEERED SAFETY SYSTEMS; MATHEMATICAL LOGIC; PROGRAMMING LANGUAGES; REACTOR PROTECTION SYSTEMS; REACTORS; SAFETY; SYSTEM FAILURE ANALYSIS; SYSTEMS ANALYSIS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety; 210200 - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled
OSTI ID:
6439329
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NEDEA
Submitting Site:
INIS
Size:
Pages: . 531-561
Announcement Date:

Journal Article:

Citation Formats

Olmos, J, and Wolf, L. Modular representation and analysis of fault trees. Netherlands: N. p., 1978. Web.
Olmos, J, & Wolf, L. Modular representation and analysis of fault trees. Netherlands.
Olmos, J, and Wolf, L. 1978. "Modular representation and analysis of fault trees." Netherlands.
@misc{etde_6439329,
title = {Modular representation and analysis of fault trees}
author = {Olmos, J, and Wolf, L}
abstractNote = {An analytical method to describe fault tree diagrams in terms of their modular compositions is developed. Fault tree structures are characterized by recursively relating the top tree event to all its basic component inputs through a set of equations defining each of the modulus for the fault tree. It is shown that such a modular description is an extremely valuable tool for making a quantitative analysis of fault trees. The modularization methodology has been implemented into the PL-MOD computer code, written in PL/1 language, which is capable of modularizing fault trees containing replicated components and replicated modular gates. PL-MOD in addition can handle mutually exclusive inputs and explicit higher order symmetric (k-out-of-n) gates. The step-by-step modularization of fault trees performed by PL-MOD is demonstrated and it is shown how this procedure is only made possible through an extensive use of the list processing tools available in PL/1. A number of nuclear reactor safety system fault trees were analyzed. PL-MOD performed the modularization and evaluation of the modular occurrence probabilities and Vesely-Fussell importance measures for these systems very efficiently. In particular its execution time for the modularization of a PWR High Pressure Injection System reduced fault tree was 25 times faster than that necessary to generate its equivalent minimal cut-set description using MOCUS, a code considered to be fast by present standards.}
journal = {Nucl. Eng. Des.; (Netherlands)}
volume = {48:2}
journal type = {AC}
place = {Netherlands}
year = {1978}
month = {Aug}
}