last modified: 01-APR-1973 | catalog | categories | new | search |

NESC0415 CEXE/INCEXE

CEXE INCEXE, 1 Group 3-D Time-Dependent Xe Oscillations in X-Y-Z Geometry with Feedback

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1. NAME OR DESIGNATION OF PROGRAM:  CEXE/INCEXE
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2. COMPUTERS
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Program name Package id Status Status date
CEXE NESC0415/01 Tested 01-APR-1973

Machines used:

Package ID Orig. computer Test computer
NESC0415/01 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

CEXE solves    the     three-
dimensional xyz  time-dependent xenon spatial  oscillation problem
using   a  modified   one  energy   group  theory   and  a   nodal
representation.
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4. METHOD OF SOLUTION

CEXE solves  for the  spatial neutron  source
distribution  with  coupled  Doppler   and  moderator  temperature
feedbacks.   The   time  dependence  of   the  iodine   and  xenon
concentrations  are based  on  the  assumption of  constant  power
during each time-step interval.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum    reactor
core size representation is restricted to a nodal configuration of
19 x 19 x 10 in the x, y, z directions, respectively.
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6. TYPICAL RUNNING TIME

A typical  problem requires  4 seconds  per
source iteration  for a 1000 node  core with no feedbacks  and 7.5
seconds per iteration  for a 2600 node core with  both Doppler and
moderator temperature feedback.
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7. UNUSUAL FEATURES OF THE PROGRAM

CEXE provides   a  full   three-
dimensional  representation   and  includes  all   major  feedback
mechanisms  which are  important  in  xenon oscillation  problems.
Maximum flexibility has been provided and the code can be used for
reactors with bidirectional coolant flow patterns.
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8. RELATED AND AUXILIARY PROGRAMS:  INCEXE   prepares    tape   input
required by CEXE.
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9. STATUS
Package ID Status date Status
NESC0415/01 01-APR-1973 Tested at NEADB
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10. REFERENCE:
NESC0415/01, included references:
- R. Kern,  D.C. Wright, W.C. Coppersmith, and  Z.R. Rosztoczy:
  Optimum  Spatial Flux Control  Project Phase I  CEXE, A Three
  dimensional Nodal Method for  Analysis of Xenon Oscillations and
  Control
  CEND-3932-1-349 (May 1969).
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11. MACHINE REQUIREMENTS

256K bytes,  6 IBM2314  disk drives,  and 3
IBM2400 tape drives
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0415/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:   OS/360.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

   Author        R. Kern
                 Reactor Theory and Analysis Section
   Contact       S. Pacino, Manager
                 Computer Services Section
                 Combustion Engineering, Inc.
                 1000 Prospect Hill Road
                 Windsor, Connecticut  06095
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16. MATERIAL AVAILABLE
NESC0415/01
File name File description Records
NESC0415_01.001 INCEXE SOURCE PROGRAMME 195
NESC0415_01.002 INCEXE DD CARDS 3
NESC0415_01.003 INCEXE SAMPLE INPUT 24
NESC0415_01.004 INCEXE SAMPLE OUTPUT 3635
NESC0415_01.005 CEXE SOURCE PROGRAMME 1432
NESC0415_01.006 CEXE DD CARDS 35
NESC0415_01.007 CEXE SAMPLE INPUT 146
NESC0415_01.008 CEXE SAMPLE OUTPUT 2486
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17. CATEGORIES
  • F. Space - Time Kinetics, Coupled Neutronics - Hydrodynamics - Thermodynamics

Keywords: Doppler coefficient, heavy water reactor, iodine, one-group theory, three-dimensional, x-y-z, xenon oscillations.