Computer Programs

NEA-0416 PIPE.

NEA-0416 PIPE.

PIPE, 1-D Gamma Transport for Slab, Spherical Shields with Compton Scattering Calculation

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, 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 OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: PIPE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
PIPE	NEA-0416/01	Tested	01-MAY-1973

Machines used:

Package ID	Orig. computer	Test computer
NEA-0416/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

The Boltzmann transport equation for gamma rays is solved for a one-dimensional shield in slab or spherical shell geometry. The Compton scattering process is treated explicitly. Photoabsorption and pair production processes are supposed to absorb the gamma energy totally.

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4. METHOD OF SOLUTION

Discrete ordinate method in energy, space, and angle. Unlike the usual Sn method, iteration in energy is avoided, and the basis is not the integro-differential form of the Boltzmann equation, but the pair of coupled integral equations (the so-called third form of the Boltzmann equation, in the terms of Weinberg and Wigner).

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

20 materials, 11 angular and 51 spatial mesh points, 60 energy groups.

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6. TYPICAL RUNNING TIME

On an IBM 370/165 about 1 to 2 minutes for a normal shielding calculation.

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7. UNUSUAL FEATURES OF THE PROGRAM

An exponential transformation allows in source-free media spatial integration steps up to 2 or 3 mean free paths. The use of the integral form of the Boltzmann equation where the exponential shows up explicitly, avoids all negative angular fluxes.

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8. RELATED AND AUXILIARY PROGRAMS: PIPE supersedes BIGGI-3P and BIGGI-4T.

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9. STATUS

Package ID	Status date	Status
NEA-0416/01	01-MAY-1973	Tested at NEADB

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10. REFERENCES

- H. Penkuhn:
  User's Manual for the Gamma Transport Codes BIGGI 3P and BIGGI 4T EUR 3555 E (1967)
- H. Penkuhn:
  How To Use the Gamma Transport Code PIPE
  EUR 4624 E (1970)

NEA-0416/01, included references:

- PIPE Draft Report
- H. Penkuhn:
How to use the Gamma Transport Code PIPE
(April 1970)

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11. MACHINE REQUIREMENTS: 512k bytes of core storage. No auxiliary storage.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0416/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: Standard.

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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS: Standard. No overlay or similar complications.

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15. NAME AND ESTABLISHMENT OF AUTHOR

   Hans Penkuhn
   C.C.R. EURATOM
   Ispra Establishment, Italy

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16. MATERIAL AVAILABLE

NEA-0416/01

File name	File description	Records
NEA0416_01.001	SOURCE PROGRAMME (FORTRAN)	1216
NEA0416_01.002	SAMPLE INPUT	226
NEA0416_01.003	SAMPLE OUTPUT	2934

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17. CATEGORIES

J. Gamma Heating and Shield Design

Keywords: discrete ordinate method, gamma radiation, one-dimensional, shells, shielding, slabs, spheres, transport theory.