NEA-0527 MONK.

1. NAME OR DESIGNATION OF PROGRAM:  MONK.

MONK-6.3 / PC Version 1.2.

3. NATURE OF PHYSICAL PROBLEM SOLVED

Monte Carlo calculation in complex 3-D geometry using a fine point energy representation of the United Kingdom Nuclear Data Library. Keff, collision rates and flux distributions are calculated in the steady state or with a given source.
(a) Geometry - three dimensional systems with a high degree of complexity.
(b) Sources - a variety of point,line surface or volume sources  may be used. Sources may be specified in energy and direction.
(c) Scoring  - by collisions or boundary crossings; fluxes by track length.
(d) Nuclear Data - based on a close representation of the UK Data Library.
(e) Tracking cycle - fission to fission or boundary to boundary.

4. METHOD OF SOLUTION:  Monte Carlo using direct simulation

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  Size of problem limited only by available storage.

6. TYPICAL RUNNING TIME:  Totally problem dependent.

On a Pentium 90 MHz personal computer, the following
running times do apply:
                     CPU time (min)
        case     2000 hist.   30000 hist.
        -----    ----------   -----------
        CASE01      0.3          0.8
        CASE02      1.6         21.0
        CASE03      1.6         21.3
        CASE04      1.0         10.6
        CASE05      1.8         20.1
        CASE06      1.4         18.5
        CASE07      1.1         11.1
        CASE08      1.9         19.8
    CPU times in the second column correspond  to  cases  run with 2000 particles  generated, as in the  NEA test cases. The third column corresponds to "converged" cases, run with 20 settling stages plus 100 stages of 300 neutrons each.

7. UNUSUAL FEATURES OF THE PROGRAM

Features 'hole routines' which enable complex geometrical shapes to be described easily whilst at the same time reducing computing costs.

8. RELATED AND AUXILIARY PROGRAMS

Replaces MONK-5 as well as the earlier GEM codes. Related programs are the SCAN geometry checking code and the COLOURSCAN interactive colour graphics geometry checking code, both of which are supplied together with MONK-6.1.

The related SCAN geometry checking code, supplied with the NEA 0527/05 package, was not implemented in this PC version. The binary version of the nuclear data files was generated with the CARD2BIN code, supplied with the NEA 0527/05 package.

10. REFERENCES

- V.S.W. Sherriffs:
  MONK - A General Purpose Monte Carlo Neutronics Program SRD Report 86.
- K.C. Rushton:
  The Monte Carlo Code MONK - A Guide To Its Use for Criticality Calculations
  SRD Report 88.

- A.F. Albornoz and C. Bastida:
  Implementation and Validation of a PC version of the Monte Carlo
  code MONK 6.3
  (February 1997)

11. MACHINE REQUIREMENTS

Typically six megabytes of fast memory or virtual memory is required for the program. Ten megabytes of secon-  dary storage (tape or disc) is required for the nuclear data. A clock is required for initial random number generation.

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  VS and VME/B.

DOS 6.0 and higher.

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Whilst the SCAN geometry checking program is not limited to specific computers or line printers, the COLOURSCAN colour graphics geometry  checking program has specifically been written for ICL computers linked to SIGMA colour graphics terminals.

Multrigroup otpions were not checked in the PC implementation.

15. NAME AND ESTABLISHMENT OF AUTHOR

The above developments are being carried out by R J Brissenden, RPD, AEE Winfrith, UKAEA.
Past contributors include: J A Enderby
                            D E Bendall
                            P J Hemmings
                            J Cruickshank
                            VSW Sherriffs
Abstract author is: P Hague, Safety and Reliability Directorate, UKAEA.

The PC implementation was done by:
      A.F. Albornoz
      Centro Atomico Bariloche
      CNEA
      Argentina

miscellaneous    mag tapeREADME.TXT Introduction to the PC package  MISTP
miscellaneous    mag tapeMONK63.TXT Information file                MISTP
miscellaneous    mag tapeABSTRACT.TXT Computer code abstract        MISTP
test-case data   mag tapeINSTALL.BAT Installation batch file        DATTP
test-case data   mag tapeEXPAND.BAT Batch file to expand files      DATTP
test-case data   mag tapeSETENV.BAT Batch to set environm. variablesDATTP
test-case data   mag tapeBE.EXE Batch file enhancer                 DATTP
miscellaneous    mag tapePKUNZIP.EXE Unzip imploded files           MISTP
miscellaneous    mag tapeSOUCE.ZIP Compressed source files          MISTP
report           mag tapeMONK63.DOC Report (Word7.0 format)         REPTP
test-case data   mag tapeMONK_BIN.001 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.002 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.003 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.004 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.005 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.006 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.007 Binary nuclear data file      DATTP
test-case data   mag tapeMONK_BIN.008 Binary nuclear data file      DATTP
miscellaneous    mag tapeMONK63.ZIP Executable & test problems      MISTP
report                   CNEA-CAB 47/01/97 (February 1997)          REPPT