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IAEA0890 MURLI.

MURLI, 1-D Flux, Reaction Rate in Cylindrical Geometry Thermal Reactor Lattice by Transport

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1. NAME OR DESIGNATION OF PROGRAM:  MURLI.
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2. COMPUTERS
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Program name Package id Status Status date
MURLI IAEA0890/02 Tested 05-JUL-1985

Machines used:

Package ID Orig. computer Test computer
IAEA0890/02 PRIME DEC VAX 11/780
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3. DESCRIPTION OF PROBLEM OR FUNCTION

MURLI is an integral transport  theory code to calculate fluxes and reaction rates in one- dimensional cylindrical geometry lattice cells of a thermal reactor. For a specified buckling, it computes k-effective using few-group diffusion theory and a few-group collapsed set of cross sections.

The code can optionally be used to solve a first order differential equation for the number density of fissile, fertile and fission product nuclei as a function of time, and to recalculate fluxes, reaction rates and k-effective at different stages of burnup.

A 27-group cross section data library is included. There are four pseudo-fission products each associated with the decay chains of plutonium and uranium isotopes in addition to Rh-105, Xe-135, Np-239, U-236, Am-241, Am-242 and Am-243. There is also data for one lumped pseudo-fission product.
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4. METHOD OF SOLUTION

Multiple collision probabilities and escape probabilities are calculated for each cylidrical shell region assuming protons are born uniformly and isotropically over the entire region volume. The equations of integral transport theory can then be solved for neutron flux.

The first order differential burnup equation is solved by a fourth order Runge-Kutta method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

There are maxima of  8 fissionable elements, 8 resonant elements, and 20 spatial regions.
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6. TYPICAL RUNNING TIME:  Approximately 20 seconds on PRIME-450.
IAEA0890/02
NEA-DB compiled and executed the test case included in  the package on VAX-11/780. CPU times required were 85 seconds for compilation and linking, and 7.6 seconds for execution.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
IAEA0890/02 05-JUL-1985 Tested at NEADB
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10. REFERENCES:
IAEA0890/02, included references:
- H.C. Huria:
  Manager's Manual for the Lattice Physics Code MURLI.
- Theory of the Lattice Physics Code MURLI.
- Users Manual for the Lattice Physics Code MURLI.
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11. MACHINE REQUIREMENTS:  32K of main storage. Three external storage units.
IAEA0890/02
Storage requirements on VAX-11/780 are 224K bytes of core memory for the load module and 163K bytes of disc space for the cross section tables.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA0890/02 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
IAEA0890/02
VAX/VMS with FORTRAN77 compiler V3.3-51.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

This code system has been included in the Coordinated Research Programme (CRP) on  "Codes Adaptable  to Small and  Medium-Size
Computers Available in Developing  Countries for In-Core Fuel
Management" of the International Atomic Energy Agency.

H.C. Huria
Theoretical Reactor Physics Section
Babha Atomic Research Centre
Trombay
Bombay 400 085, India.
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16. MATERIAL AVAILABLE
IAEA0890/02
File name File description Records
IAEA0890_02.003 INFORMATION FILE 148
IAEA0890_02.004 COMMAND PROC. TO INSTALL MURLI AND RUN TEST 43
IAEA0890_02.005 MURLI SOURCE PROGRAM (FORTRAN) 1838
IAEA0890_02.006 X-SEC LIBRARY FILE 1 (FORMATTED EBCDIC) 5301
IAEA0890_02.007 X-SEC LIBRARY FILE 2 (FORMATTED EBCDIC) 620
IAEA0890_02.008 TOBINA SOURCE PROGRAM (FORTRAN) 71
IAEA0890_02.009 MURLI TEST CASE INPUT DATA 16
IAEA0890_02.010 PRINTOUT OF INSTALLATION RUN 4582
IAEA0890_02.011 MURLI TEST CASE PRINTED OUTPUT 214
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems
  • C. Static Design Studies

Keywords: cylindrical configuration, diffusion equations, multiplication factors, neutron flux, one-dimensional, reaction rates, reactor lattices, thermal reactors, transport theory.