CCC-0631 LWRARC-1.0.

1. NAME OR DESIGNATION OF PROGRAM:  LWRARC-1.0.

3. DESCRIPTION OF PROGRAM OR FUNCTION

LWRARC calculates spent fuel decay heat generation rates for standard pressurized water reactor (PWR) and boiling water reactor (BWR) fuel assembly designs for cooling times between 1 and 110 years.

4. METHOD OF SOLUTION

LWRARC provides an interactive menu-driven user interface to perform automated interpolations and adjustments of a data base of decay heat generation rates produced by the SAS2H analysis sequence of the SCALE-4 system. Using generic PWR and BWR assembly models, SAS2H calculations were performed with each model for six different burnups at each of three separate specific powers  to produce heat rates at 20 cooling times in the range of 1 to 100 years. LWRARC uses a procedure that includes proper interpolation formulae for the tabulated heat generation rates. Adjustment formulae for the interpolated values are provided to account for differences in initial 235U enrichment and changes in the specific power of a cycle from the average value. Finally, safety factor formulae derived as a function of burnup, cooling time, and type of  reactor are added.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Limitations include  cooling times of 1 to 100 years, maximum burnups of 45 MWd/kgU for BWRs and 50 MWd/kgU for PWR's. Additional limitations and restrictions in the method are discussed in detail in the documentation accompanying the software. The code itself automatically performs checks on input data to ensure that these limits are not exceeded.

6. TYPICAL RUNNING TIME

Typical running times are less than one minute on an 80386 PC.

The program LWRARC was executed at the NEA-DB on a PC DELL Pentium processor of 99 MHz, under MS-DOS 6.2. A few tenths of  a second are required to run the sample problems. The program LWRARC is menu driven and runs interactively.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

10. REFERENCES:

- O.W.Hermann et al.:
  Technical Support for a Proposed Decay Heat Guide Using
  SAS2H/ORIGEN-S Data
  NUREG/CR-5625 (ORNL-6698) (July 1994)

11. MACHINE REQUIREMENTS:  Runs on an IBM XT, AT, 80386 or greater PC.

The program LWRARC was executed on a PC DELL Optiplex GXM 5100, with a Pentium processor of 99 MHz, base memory 640 Kbyte  and extended memory 16 MByte. The diskspace occupied by the package  files amounts to about 300 Kbyte. The filesize of the LWRARC executable file is 179 Kbyte.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

Under DOS 6.2 the Microsoft BASIC PDS 7.1 compiler/ linker was used to compile the BASIC source files and link them with proprietary BASIC and Assembler routines from Crescent Software's QuickPak Professional and QuickScreen libraries to create the executable included in the package. The BASIC source files are included. However, the Crescent Software routines are not distributed since they are proprietary.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Oak Ridge National Laboratory
                Oak Ridge Tennessee, U.S.A.

File name	File description	Records
CCC0631_01.001	Information package of file LWRARC-1.0	171
CCC0631_01.002	BASIC language source code file # 1	863
CCC0631_01.003	BASIC language source code file # 2	1479
CCC0631_01.004	BASIC language source code file # 3	199
CCC0631_01.005	Executable of program LWRARC	0
CCC0631_01.006	Aux. binary file (.FRM) # 1	0
CCC0631_01.007	Aux. binary file (.FRM) # 2	0
CCC0631_01.008	Aux. binary file (.FRM) # 3	0
CCC0631_01.009	Aux. binary file (.FRM) # 4	0
CCC0631_01.010	Aux. binary file (.BSV) # 1	0
CCC0631_01.011	Aux. binary file (.BSV) # 2	0
CCC0631_01.012	Aux. binary file (.BSV) # 3	0
CCC0631_01.013	Aux. binary file (.QSL) # 1	0
CCC0631_01.014	Sample input file (binary)	0
CCC0631_01.015	Sample output file	291
CCC0631_01.016	Auxiliary file	3
CCC0631_01.017	DOS file-names	15