IAEA1174 PSAPACK.

1. NAME OR DESIGNATION OF PROGRAM:  PSAPACK.

3. DESCRIPTION OF PROGRAM OR FUNCTION

An integrated fault-event tree  software package PSAPACK (Probabilistic Safety Analysis PACKage) was developed for level-1 PSA using personal computers (PC). It is a menu driven interactive modular system which permits different choices, depending on the user's purposes and needs.
The event tree development module is capable of developing the logic accident sequences based on the user's specified relations between event tree headings. Identification of success sequences and core damage sequences is done automatically by the code based on the success function input by the user. It links minimum cut sets (MCS)  from system fault trees and performs the Boolean reduction. It can also retrieve data from the reliability data base to perform the quantification of accident sequences.

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The fault tree module contains full screen graphics and text editors. It is possible to transfer the tree structure from graphics to text format and vice-versa. Fault tree reduction and minimum cut set determination is performed by well known codes like ALLCUTS, MOCUS of FTAP. Convenient interfaces have been developed for input data preparation and for storage of the results in the MCS library.
The MCS module can be used for the MCS screening and quantification. PC version of SAMPLE code is used in this module for uncertainty analysis.

6. TYPICAL RUNNING TIME:

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS

A reliability data base (RDB) module is used for the management of reliability data. This module can create a data base retrieving data from a RDB compiled by the IAEA from 21 sources and which contains about 1000 records. All components and failure modes normally considered in PSA are included in the RDB. Reliability data can be screened and modified by the user.

10. REFERENCES:

- G. Caruso et al:
  PSAPACK 4.2
  A Code for Probabilistic Safety Assessment Level 1
  User's Manual
  Computer Manual Series No.6, IAEA Vienna (1995).

11. MACHINE REQUIREMENTS

The hardware requirements include: IBM PC/XT, AT or compatible with at least 512Kb memory, 1 diskette drive, 1
hard disk 10 Mb drive and a printer. A monochrome or color graphics  card with a monochrome or color graphics display should be available if the fault tree graphics editor is used.
3.0 Mb space are occupied on a hard disk by the PSAPACK after its installation. This is a hard disk version of the package. It consists of 4 program diskettes (double sided, double density) 1
system diskette, 1 diskette with the compressed version of the IAEA  reliability data base and 1 diskette with the sample problem.

The executable was run by the NEA Data Bank on a DELL Optiplex GXi/166MHz PC with 64 MB of RAM.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

The executable ran at the NEA Data Bank under Windows NT 4.0.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

A DOS utilities module is used for file management functions. It covers practically all requirements.

15. NAME AND ESTABLISHMENT OF AUTHORS

          A. BOIADJIEV, H. VALLERGA
          International Atomic Energy Agency
          Division of Nuclear Safety
          Reliability & Risk Assessment
          P.O. Box 100
          A-1400 VIENNA, Austria

File name	File description	Records
IAEA1174_03.001	Information file	120
IAEA1174_03.002	MASTER disk files	0
IAEA1174_03.003	Disk 1 files	0
IAEA1174_03.004	Disk 2 files	0
IAEA1174_03.005	Disk 3 files	0
IAEA1174_03.006	DOS file-names	5