last modified: 25-FEB-1993 | catalog | categories | new | search |

CCC-0381 PLACID.

PLACID, Gamma Streaming in Cylindrical Duct Shields by Monte-Carlo

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1. NAME OR DESIGNATION OF PROGRAM:  PLACID.
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2. COMPUTERS
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Program name Package id Status Status date
PLACID CCC-0381/01 Tested 25-FEB-1993

Machines used:

Package ID Orig. computer Test computer
CCC-0381/01 IBM 3033 DEC VAX 6000
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3. DESCRIPTION OF PROGRAM OR FUNCTION

PLACID simulates gamma streaming through straight cylindrical ducts in shields using the Monte Carlo method.
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4. METHOD OF SOLUTION

Monte Carlo simulation is employed with variance reduction devices such as Russian Roulette and cutoff weight for history termination. Photon point total cross sections are used. Klein-Nishina formulae are used for differential scattering cross section. The Kahn double rejection technique is used for sampling the scattered photon energy and the scattering angle. Next event estimation is used for scoring the streaming flux.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Only straight cylindrical ducts in shields are simulated.
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6. TYPICAL RUNNING TIME

Simulation of Cs-137 photon streaming through a cylindrical duct of 100 cm length and 5 cm radius takes 76 msec per history. About 6400 histories give the total dose at the duct exit within a 10% statistical error. The sample problem included in  the package required 63.93 CPU seconds to compile and execute on the IBM 3033 computer.
CCC-0381/01
NEA-DB ran the test case included in this package on a
DEC VAX 6000-510 computer in 0.63 seconds of CPU time.
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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
CCC-0381/01 25-FEB-1993 Tested at NEADB
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10. REFERENCES:
CCC-0381/01, included references:
- R. Indira and K.P.N. Murthy:
  Monte Carlo Simulation of Gamma Streaming Through Straight
  Cylindrical Ducts.
  FRG/01100/RP-219  (January 1982)
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11. MACHINE REQUIREMENTS

PLACID was developed on the IBM 370/55-II computer and modified to run on the IBM 3033 computer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
CCC-0381/01 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

The IBM 370 computer on which PLACID was developed runs IBM OS/VS. The IBM 3033  used for the testing runs IBM OS/VS2. At RSIC, PLACID was compiled using the IBM FORTRAN H Extended Enhanced compiler.
CCC-0381/01
VMS V5.4-2 (DEC VAX-6000).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

Developed by:   Reactor Research Centre
                Kalpakkam
                Tamil Nadu, India
Contributed by:
                Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.
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16. MATERIAL AVAILABLE
CCC-0381/01
File name File description Records
CCC0381_01.001 Information file 50
CCC0381_01.002 JCL to execute PLACID for IBM vers. (author) 23
CCC0381_01.003 JCL and control information (NEADB) 7
CCC0381_01.004 PLACID FORTRAN IV source program (author) 699
CCC0381_01.005 PLACID FORTRAN source program (NEADB) 734
CCC0381_01.006 RANDU and STIME (FORTRAN IV) sub.(IBM vers.) 43
CCC0381_01.007 ICLOCK function (assembler) (IBM ver.) 92
CCC0381_01.008 Sample problem input 14
CCC0381_01.009 Sample problem output (NEADB) 884
CCC0381_01.010 Sample problem output IBM vers. (RSIC) 920
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17. CATEGORIES
  • J. Gamma Heating and Shield Design

Keywords: Monte Carlo method, ducts, gamma radiation, shields, streaming.