RSICC CODE PACKAGE PSR-452

1. NAME AND TITLE

RCSLK9: Code System to Calculate Reactor Coolant System Leak Rate in PWRs.

2. CONTRIBUTORS

Nuclear Regulatory Commission, Washington, DC through the Energy Science and Technology Software Center, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

IBM BASIC 02.00; IBM BASIC 02.10; IBM PC (P00452IBMPC00).

4. NATURE OF PROBLEM SOLVED

RCSLK9 was developed to analyze the leak tightness of the primary coolant system for any pressurized water reactor (PWR). From given system conditions, water levels in tanks, and certain system design parameters, RCSLK9 calculates the loss of water from the reactor coolant system (RCS) and the increase of water in the leakage collection system during an arbitrary time interval. The program determines the system leak rates and displays or prints a report of the results. During the initial application to a specific reactor, RCSLK9 creates a file of system parameters and saves it for future use.

5. METHOD OF SOLUTION

RCSLK9 provides the inspector with the capability to independently analyze the leak tightness of PWR reactor coolant systems. By taking two sets of water inventory data in the RCS and in leak collection tanks, separated by a time interval, and applying RCSLK9, the inspector can obtain the gross leak rate for the RCS and the rate at which the leakage is being collected. The gross leak rate for the cooling system is found by dividing the inventory loss in pounds by the product of the elapsed time between inventories and the density of water. The quotient is converted to gallons per minute. To determine the identified leak rate for the RCS and the chemical and volume control system (CVCS) during the test, the amount of water collected in the pressurizer relief tank and the reactor drain tank must be calculated. Water inventories for the pressurizer relief tank and the reactor drain tank are determined from measured levels and the tank calibration curves or tank dimensions. To find the identified leak rate for the cooling system, RCSLK9 divides the combined inventory gain in pounds for the reactor drain tank and the pressurizer relief tank by the product of the elapsed time between inventories and the density of water. The test data required for calculating the identified leak rate are the water levels in the tanks and the test duration. The unidentified leak rate is calculated by subtracting the identified leak rate from the gross leak rate.

6. RESTRICTIONS OR LIMITATIONS

RCSLK9 assumes that the hot and cold legs of the RCS have equal volumes.

7. TYPICAL RUNNING TIME

Only a few seconds are required to perform the leak calculations on an IBM PC/AT.

8. COMPUTER HARDWARE REQUIREMENTS

IBM PC, or compatible, with 64K bytes or greater RAM.

9. COMPUTER SOFTWARE REQUIREMENTS

DOS 2.0 or higher and IBM BASIC, Version 2.00 or D2.10 are required to run the executable included in the package.

10. REFERENCES

D. C. Kirkpatrick, R. W. Woodruff, P. Bell, "RCSLK9: Reactor Coolant System Leak Rate Determination for PWRs, User's Guide: Installation Procedures," NUREG-1107 Addendum (December 1986).

D. C. Kirkpatrick, R. W. Woodruff, R. A. Holland, "RCSLK9: Reactor Coolant System Leak Rate Determination for PWRs, User's Guide," NUREG-1107 (December 1986).

L. Eyberger, "RCSLK9 Flexible Disk Cartridge Description and Implementation Information," NESC No 1090," NESC Note 87-66 (May 14, 1987).

11. CONTENTS OF CODE PACKAGE

Included in the package are the referenced documents and one 3.5" DOS-formatted diskette which includes BASIC executables, BASIC source files and parameter data.

12. DATE OF ABSTRACT

October 1999.

KEYWORDS: MICROCOMPUTER; PWR; REACTOR COOLING SYSTEM