NESC0167 FLARE

FLARE, 3-D BWR Reactivity and Power Distribution Appraisal Calculation

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FLARE

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2. COMPUTERS

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Program name	Package id	Status	Status date
FLARE	NESC0167/01	Tested	01-JUN-1977

Machines used:

Package ID	Orig. computer	Test computer
NESC0167/01	IBM 370 series	IBM 370 series

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3. DESCRIPTION OF PROBLEM OR FUNCTION

FLARE   is   an   inexpensive
calculational method to  determine core reactivity and  core power
distribution.  A scoping  calculation of this type  is valuable in
appraising the  physics characteristics of  planned test  modes of
operation so that detailed analysis can be reserved for those core
calculations  of greater  interest  from  either a  technician  or
safety standpoint.

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4. METHOD OF SOLUTION

The calculations include a representation of
the coupled effects of flow, power, voids, and each control rod
independently.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Because   of   the
independent representation   of  the   control   rods,  a   three-
dimensional calculational  scheme   was  employed.    This  three-
dimensional  geometry  combined  with  computer  size  limitations
restricted  the calculations  to a  relatively  coarse mesh.   The
present version of the code will handle a maximum array of 14 x 14
x 12 nodes with either mirror or diagonal symmetry.

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6. TYPICAL RUNNING TIME

5 minutes are required to run the sample
problem on the IBM360. 6 seconds are required to run the sample
problem on a CDC7600.

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7. UNUSUAL FEATURES OF THE PROGRAM

A 3-dimensional coarse-mesh flux
calculation is incorporated.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NESC0167/01	01-JUN-1977	Tested at NEADB

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10. REFERENCES

D. L. Delp,  D. L. Fisher, J. M. Harriman,  and M. J.
Stedwell,  FLARE  -  A  Three-dimensional  Boiling  Water  Reactor
Simulator, GEAP-4598, July 16, 1964.
             Nels J. Anderson, Jr., IDFTAP,  A FORTRAN IV Function
Subprogram, S6T001, January 15, 1965.
             BITA,   A  FORTRAN-compatible   Subroutine,   L5T001,
December 3, 1964.
             Modification of Input and Output for CDC7600 Version,
FLARE NESC No. 167.7600, NESC Note 79-15, December 11, 1978.

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11. MACHINE REQUIREMENTS

39K and 3  tapes in addition to  the system
units  are used  on  the GE635,  400K  and 5  tapes  or disks  are
required on the IBM360.  80,000 (octal) words of small core memory
and 12,000 (octal)  words of large core memory are  needed for the
CDC7600 version.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NESC0167/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: GECOS (GE635),
OS/360 (IBM360), and SCOPE (CDC7600).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

   The
program uses two intermediate  tapes and produces a  tape for off-
line punched cards.  To execute the  CDC7600 version on a CDC6600,
the parameter EC20 should be entered on the JOB card.

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15. NAME AND ESTABLISHMENT OF AUTHORS

   635           D. L. Delp and D. L. Fisher, Physics
                 J. M. Harriman and M. J. Stedwell, Programming
                 General Electric Company
                 175 Curtner Avenue
                 San Jose, California  95125
   360           George W. Perry
                 Middle South Services, Inc.
                 Box 61000
                 New Orleans, Louisiana  70160
   360           Dr. Frederick W. Buckman
                 Consumers Power Company
                 1945 Parnall Avenue
                 Jackson, Michigan  49201
   7600          T. Kettler
                 Nuclear Energy Services, Inc.
                 Shelter Rock Road
                 Danbury, Connecticut  06810

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16. MATERIAL AVAILABLE

NESC0167/01

File name	File description	Records
NESC0167_01.001	FLARE SOURCE - F4 EBCDIC	3442
NESC0167_01.002	FLARE SAMPLE PROBLEM INPUT	42
NESC0167_01.003	FLARE SAMPLE PROBLEM OUTPUT	423
NESC0167_01.004	JOB CONTROL	8

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17. CATEGORIES

C. Static Design Studies

Keywords: power distribution, reactivity, three-dimensional.