NESC0415 CEXE/INCEXE

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

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, REFERENCE, 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: CEXE/INCEXE

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

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.