RSICC CODE PACKAGE PSR-433/SQUIRT 2.3

1. NAME AND TITLE

SQUIRT 2.3: Code System to Predict Leakage Rate and Area of Crack Opening for Cracked Pipes in Nuclear Power Plants.

2. CONTRIBUTORS

Battelle Memorial Institute, Columbus, Ohio, through the Energy Science and Technology Science Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Microsoft Quick Basic; IBM PC (P00433IBMPC00).

4. NATURE OF PROBLEM SOLVED

The SQUIRT (Seepage Quantification of Upsets In Reactor Tubes) software is designed to perform leakage rate and area of crack opening calculations for through-wall cracks in pipes. The fluid in the piping system is assumed to be water at either subcooled or saturated conditions. The development of the SQUIRT computer model enables licensing authorities and industry users to conduct the leak-rate evaluations for leak-before-break applications in a more efficient manner.

5. METHOD OF SOLUTION

The SQUIRT program uses a modified from of the Henry-Fauske model for the thermal-hydraulics analysis together with Elastic-Plastic Fracture Mechanics using GE/EPRI and LBB.ENG2 methods for crack opening analysis.

6. RESTRICTIONS OR LIMITATIONS

SQUIRT requires 512KB of conventional memory and an organized structure. Software can only be executed from the main SQUIRT23 directory where the software was installed. The program predicts an unrealistic step change in leak rates when going from a single-phase flow to a two-phase flow.

7. TYPICAL RUNNING TIME

Run time requirements depend highly on the type of PC but most runs require less than 2 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

SQUIRT was developed on an IBM personal computer and compatibles and requires 512 conventional memory.

9. COMPUTER SOFTWARE REQUIREMENTS

SQUIRT was developed under the DOS operating system (2.0 or higher). Executables created with Microsoft Quick Basic are included in the package. The code can be run in a DOS window of Windows95. The software was completed November 30, 1994 and was not modified when it was transferred to RSICC and released in April 2001.

10. REFERENCES

a) include in documentation:

D. D. Paul, N. Ghadiali, S. Rarhman, P. Krishnaswamy, and G. Wilkowski, "Short Cracks Piping and Piping Welds Program, SQUIRT: Seepage Quantification of Upsets In Reactor Tubes, User's Manual, Version 2.3," Informal Note (November 30, 1994).

b) background references:

S. Rahman and others, "Refinement and Evaluations of Crack-Opening-Area Analysis for Circumferential Through-Wall Cracks in Pipes," NUREG/CR-6300 (April 1995).

D. D. Paul and others, "Evaluation and Refinement of Leak-Rate Estimation Models," NUREG/CR-5128, Rev. 1 (June 1994).

11. CONTENTS OF CODE PACKAGE

Included in the package are the referenced document in 10.a and a DS/HD diskette with a self-extracting, compressed DOS file that contains the executables. Source files are not included.

12. DATE OF ABSTRACT

April 2001.

KEYWORDS: PIPE FRACTURE; THERMAL HYDRAULICS