CCC-0381 PLACID.

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

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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, REFERENCES, 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: 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.