last modified: 18-AUG-1995 | catalog | categories | new | search |

ESTS0003 IRRAS4.16.

IRRAS, Integrated Reliability and Risk Analysis System for PC

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1. NAME OR DESIGNATION OF PROGRAM:  IRRAS4.16.
IRRAS, integrated reliability & risk analysis.
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
IRRAS4.16 ESTS0003/03 Tested 18-AUG-1995

Machines used:

Package ID Orig. computer Test computer
ESTS0003/03 IBM PC PC-80486
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3. DESCRIPTION OF PROGRAM OR FUNCTION

IRRAS4.16 is a program developed for the purpose of performing those functions necessary to create and analyze a complete Probabilistic Risk Assessment (PRA). This program includes functions to allow the user to create event trees and fault trees, to define accident sequences and basic event failure data, to solve system and accident sequence fault trees, to quantify cut sets, and to perform uncertainty analysis on  the results. Also included in this program are features to allow the analyst to generate reports and displays that can be used to document the results of an analysis. Since this software is a very detailed technical tool, the user of this program should be familiar with PRA concepts and the methods used to perform these analyses.
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4. METHOD OF SOLUTION

IRRAS4.16 is written entirely in MODULA-2 and uses an integrated commercial graphics package to interactively construct and edit fault trees. The fault tree solving methods used  are industry recognized top down algorithms. For quantification, the program uses standard methods to propagate the failure information through the generated cut sets.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Due to the complexity of and the variety of ways a fault tree can be defined it is difficult to define limits on the complexity of the problem solved by this software. It is, however, capable of solving a
substantial fault tree due to efficient methods. At this time, the software can efficiently solve problems as large as other software currently used on mainframe computers. Does not include source code.
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6. TYPICAL RUNNING TIME

IRRAS4.16 running times are a function of the problem to be solved and the actions performed by the user.
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7. UNUSUAL FEATURES OF THE PROGRAM

This software is unique in several ways. First, it uses a relational database to store and manage the risk data associated with an analysis. Second it uses graphical editors to allow the analyst to construct and modify fault tree and event tree logic. Third the algorithms used to solve the fault trees and accident sequences are very fast due to technical advances.
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8. RELATED AND AUXILIARY PROGRAMS

IRRAS4.16 is a replacement for version 4.15 of IRRAS which had bee submitted previously. The changes in this version include several minor bug fixes and a
significant change in the way IRRAS4.16 handles the situation where  more cut sets are generated than can be stored in the data base. When the user solves a fault tree that has more cut sets than can be stored, IRRAS simply stops storing the cut sets at the point it determines that it cannot keep them all. IRRAS does display the results for all the cut sets generated, but only keeps a subset of the total. This subset was not the most probable cut sets. The procedure has caused much confusion, in that many assumed that IRRAS was keeping the most significant cut sets. Since this confusion may  lead to some problems in reporting results, and since the change was very simple, the way the software works has been modified. IRRAS4.16 now keeps the most significant cut sets when the number of cut sets  is more than can be stored. This should eliminate any confusion on how IRRAS handles this situation.
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9. STATUS
Package ID Status date Status
ESTS0003/03 18-AUG-1995 Tested at NEADB
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10. REFERENCES

- T.W. Bolander et al.:
  Verification and Validation of the SAPHIRE version 4.0 PRA
  Software Package
  NUREG/CR-6145 (February 1994)
ESTS0003/03, included references:
- K.D. Russel et al.:
  Integrated Reliability and Risk Analysis System (IRRAS) Version
  4.0
  Reference Manual
  NUREG/CR-5813
  EGG-2664 Vol.1 (January 1992)
- R.L. VanHorn et al.:
  Integrated Reliability and Risk Analysis System (IRRAS) Version
  4.0
  Tutorial
  NUREG/CR-5813
  EGG-2664 Vol.2 (October 1992)
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11. MACHINE REQUIREMENTS

IBM PC/XT/AT/PS/2, or 100% compatible computer running DOS5.0. The PC must have a 640 K of RAM, and EGA/VGA compatible monitor and display adapter, and a hard disk with at least 10 megabytes of free space. A numeric math co-processor and a mouse are highly recommended.
ESTS0003/03
The program was implemented at the NEA Data Bank on a
DELL 466/L (66MHz) PC/80486.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0003/03 MODULA 2
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS5.0.
ESTS0003/03
The program was running at the NEA Data Bank under MS-DOS 6.0.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

This
software uses the Media Cybernetics HALO graphical support routines. The run time files are included with this software and can be distributed with this software as a license has been acquired. Since no source code or sample problems were included in the submittal of  this package, the executable, as submitted by author, was evaluated  and screened. PKZIP 1.1 was used in creating this software. SOURCE CODE IS NOT INCLUDED.
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15. NAME AND ESTABLISHMENT OF AUTHORS

   K.D. Russell
   EG and G Idaho Inc.
   IDAHO FALLS, ID, U. S. A.
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16. MATERIAL AVAILABLE
ESTS0003/03
File name File description Records
ESTS0003_03.001 Information file 240
ESTS0003_03.002 IRRAS batch file 2
ESTS0003_03.003 batch file #1 2
ESTS0003_03.004 batch file #2 2
ESTS0003_03.005 batch file #3 2
ESTS0003_03.006 batch file #4 2
ESTS0003_03.007 batch file #5 2
ESTS0003_03.008 batch file #6 2
ESTS0003_03.009 batch file #7 2
ESTS0003_03.010 batch file #8 2
ESTS0003_03.011 batch file #9 2
ESTS0003_03.012 batch file #10 2
ESTS0003_03.013 batch file #11 3
ESTS0003_03.014 batch file #12 2
ESTS0003_03.015 batch file #13 2
ESTS0003_03.016 DEMO variable length data file #1 0
ESTS0003_03.017 DEMO variable length data file #2 0
ESTS0003_03.018 DEMO variable length data file #3 0
ESTS0003_03.019 DEMO variable length data file #4 0
ESTS0003_03.020 DEMO variable length data file #5 0
ESTS0003_03.021 DEMO variable length data file #6 0
ESTS0003_03.022 DEMO variable length data file #7 0
ESTS0003_03.023 DEMO variable length data file #8 0
ESTS0003_03.024 DEMO variable length data file #9 0
ESTS0003_03.025 DEMO variable length data file #10 0
ESTS0003_03.026 DEMO variable length data file #11 0
ESTS0003_03.027 DEMO data file #1 0
ESTS0003_03.028 DEMO data file #2 0
ESTS0003_03.029 DEMO data file #3 0
ESTS0003_03.030 DEMO data file #4 0
ESTS0003_03.031 DEMO data file #5 0
ESTS0003_03.032 DEMO data file #6 0
ESTS0003_03.033 DEMO data file #7 0
ESTS0003_03.034 DEMO data file #8 0
ESTS0003_03.035 DEMO data file #9 0
ESTS0003_03.036 DEMO data file #10 0
ESTS0003_03.037 DEMO data file #11 0
ESTS0003_03.038 DEMO data file #12 0
ESTS0003_03.039 DEMO data file #13 0
ESTS0003_03.040 DEMO data file #14 0
ESTS0003_03.041 DEMO data file #15 0
ESTS0003_03.042 DEMO index file #1 0
ESTS0003_03.043 DEMO index file #2 0
ESTS0003_03.044 DEMO index file #3 0
ESTS0003_03.045 DEMO index file #4 0
ESTS0003_03.046 DEMO index file #5 0
ESTS0003_03.047 DEMO index file #6 0
ESTS0003_03.048 DEMO index file #7 0
ESTS0003_03.049 DEMO index file #8 0
ESTS0003_03.050 DEMO index file #9 0
ESTS0003_03.051 DEMO index file #10 0
ESTS0003_03.052 DEMO index file #11 0
ESTS0003_03.053 DEMO index file #12 0
ESTS0003_03.054 DEMO DFL file 0
ESTS0003_03.055 DEMO fault tree graphics file #1 0
ESTS0003_03.056 DEMO fault tree graphics file #2 0
ESTS0003_03.057 DEMO event tree graphics file 17
ESTS0003_03.058 program executable file #1 0
ESTS0003_03.059 program executable file #2 0
ESTS0003_03.060 program executable file #3 0
ESTS0003_03.061 program executable file #4 0
ESTS0003_03.062 program executable file #5 0
ESTS0003_03.063 program executable file #6 0
ESTS0003_03.064 program executable file #7 0
ESTS0003_03.065 program executable file #8 0
ESTS0003_03.066 program executable file #9 0
ESTS0003_03.067 program executable file #10 0
ESTS0003_03.068 program executable file #11 0
ESTS0003_03.069 program executable file #12 0
ESTS0003_03.070 program executable file #13 0
ESTS0003_03.071 program executable file #14 0
ESTS0003_03.072 program executable file #15 0
ESTS0003_03.073 program executable file #16 0
ESTS0003_03.074 program executable file #17 0
ESTS0003_03.075 program executable file #18 0
ESTS0003_03.076 program executable file #19 0
ESTS0003_03.077 program executable file #20 0
ESTS0003_03.078 program executable file #21 0
ESTS0003_03.079 program executable file #22 0
ESTS0003_03.080 program executable file #23 0
ESTS0003_03.081 program executable file #24 0
ESTS0003_03.082 program executable file #25 0
ESTS0003_03.083 program executable file #26 0
ESTS0003_03.084 program executable file #27 0
ESTS0003_03.085 program DFL file #1 0
ESTS0003_03.086 program DFL file #2 0
ESTS0003_03.087 program DFL file #3 0
ESTS0003_03.088 program DFL file #4 0
ESTS0003_03.089 program DFL file #5 0
ESTS0003_03.090 program DFL file #6 0
ESTS0003_03.091 program DFL file #7 0
ESTS0003_03.092 program DFL file #8 0
ESTS0003_03.093 program DFL file #9 0
ESTS0003_03.094 program file #1 0
ESTS0003_03.095 program file #2 0
ESTS0003_03.096 graphics file #1 0
ESTS0003_03.097 graphics file #2 0
ESTS0003_03.098 graphics file #3 0
ESTS0003_03.099 graphics file #4 0
ESTS0003_03.100 graphics file #5 0
ESTS0003_03.101 graphics file #6 0
ESTS0003_03.102 graphics file #7 0
ESTS0003_03.103 graphics file #8 0
ESTS0003_03.104 graphics file #9 0
ESTS0003_03.105 graphics file #10 0
ESTS0003_03.106 graphics file #11 0
ESTS0003_03.107 graphics file #12 0
ESTS0003_03.108 graphics file #13 0
ESTS0003_03.109 graphics file #14 0
ESTS0003_03.110 graphics file #15 0
ESTS0003_03.111 graphics file #16 0
ESTS0003_03.112 graphics file #17 0
ESTS0003_03.113 graphics file #18 0
ESTS0003_03.114 graphics file #19 0
ESTS0003_03.115 graphics file #20 0
ESTS0003_03.116 graphics file #21 0
ESTS0003_03.117 graphics file #22 0
ESTS0003_03.118 graphics file #23 0
ESTS0003_03.119 graphics file #24 0
ESTS0003_03.120 graphics file #25 0
ESTS0003_03.121 graphics file #26 0
ESTS0003_03.122 graphics file #27 0
ESTS0003_03.123 graphics file #28 0
ESTS0003_03.124 graphics file #29 0
ESTS0003_03.125 graphics file #30 0
ESTS0003_03.126 graphics file #31 0
ESTS0003_03.127 graphics file #32 0
ESTS0003_03.128 graphics file #33 0
ESTS0003_03.129 graphics file #34 0
ESTS0003_03.130 graphics file #35 0
ESTS0003_03.131 graphics file #36 0
ESTS0003_03.132 graphics file #37 0
ESTS0003_03.133 graphics file #38 0
ESTS0003_03.134 graphics file #39 0
ESTS0003_03.135 graphics file #40 0
ESTS0003_03.136 graphics file #41 0
ESTS0003_03.137 graphics file #42 0
ESTS0003_03.138 graphics file #43 0
ESTS0003_03.139 graphics file #44 0
ESTS0003_03.140 graphics file #45 0
ESTS0003_03.141 graphics file #46 0
ESTS0003_03.142 graphics file #47 0
ESTS0003_03.143 DOS file-names 142
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • K. Reactor Systems Analysis

Keywords: Monte Carlo method, fault tree analysis, reliability, risk assessment.