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[Program Service | Recent programs]

ESTS0003 IRRAS4.16. (Abstract last modified 18-AUG-1995)


IRRAS, Integrated Reliability and Risk Analysis System for PC

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - IRRAS4.16. 
 IRRAS, integrated reliability & risk analysis. 


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
IRRAS2.0             ESTS0003/01 Obsolete
IRRAS2.5             ESTS0003/02 Obsolete
IRRAS4.16            ESTS0003/03 Tested

Machines used:
Package-ID     Orig.Computer                       Test Computer
ESTS0003/03    IBM PC                              PC-80486

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.


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.


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.


6. TYPICAL RUNNING TIME - IRRAS4.16 running times are a function of the problem to be solved and the actions performed by the user.


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.


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.


9. STATUS
ESTS0003/01: 07-AUG-1995 Obsolete
ESTS0003/02: 07-AUG-1995 Obsolete
ESTS0003/03: 18-AUG-1995 Tested at NEADB


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:
- 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)


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. 


12. PROGRAMMING LANGUAGE(S) USED -
ESTS0003/03: MODULA 2 


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. 


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.


15. NAME AND ESTABLISHMENT OF AUTHORS - 
   K.D. Russell 
   EG and G Idaho Inc. 
   IDAHO FALLS, ID, U. S. A. 


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


17. CATEGORIES  - 

- G. Radiological Safety, Hazard and Accident Analysis
- K. Reactor Systems Analysis


Keywords: FAULT TREE ANALYSIS, MONTE CARLO METHOD, RELIABILITY, RISK ASSESSMENT

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