IAEA0905 PRESTO.

PRESTO, Slab Shields for Time-Dependent Gamma Spectra

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: PRESTO is a simple code for gamma
ray shielding design-studies. The final design of real shielding
should be taken from more complex codes.

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2. COMPUTERS

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Program name	Package id	Status	Status date
PRESTO	IAEA0905/01	Tested	09-MAY-1989

Machines used:

Package ID	Orig. computer	Test computer
IAEA0905/01	BESM-6	DEC VAX 8810

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3. DESCRIPTION OF PROGRAM OR FUNCTION

PRESTO is designed to calculate slab shields for gamma ray sources of complex and time dependent energy spectra.
PRESTO I treats cylinder sources with shields at side, such as pipelines or containers in radioactive facilities.
PRESTO II is the analogous code for spherical sources.
The programs permit to consider volume sources or a combination of volume and surface sources. To describe the source spectrum, one can start from the nuclides contained in the source mixture or (with the aid of PRESTO IA) from energy group sets.
The internal data set contains 5 common shield construction materials.

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4. METHOD OF SOLUTION

The solution method is based on the point kernel integration, extended by the "self absorption distance" concept.
The approximation mentioned before reduces the spatial flux calculation to a plane problem.
The dose build-up factor is taken into account by Taylor's equation. Some functions necessary for the integration will be calculated inside the program, by means of extrapolation based on the internal data sets.
PRESTO permits to calculate:
1). required shield thicknesses for a given dose rate level or the allowed activity concentration of the source for a given shield thickness, both time dependent.
2). the contribution to the dose rate by single nuclides.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

- Energy range from 0.1 to 10 MeV.
- Contents of internal nuclide library:
100 nuclides with 428 energy lines. One job run can use 30 of them (up to 280 energy lines)
- PRESTO I : 1 shielding material per job
- PRESTO II: up to 5 shielding materials per job
- PRESTO IA: 40 energy groups, taken from the nuclides contained in the data set, or up to 250 free energy groups.

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6. TYPICAL RUNNING TIME

- PRESTO I about 1 min.
- PRESTO II about 1.5 min.
- Using PRESTO IA not significantly longer.

IAEA0905/01

NEA-DB ran the different modules of the test case included in this package on a VAX 8810 computer in less than 6 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM

PRESTO is written especially for simple shielding design studies. The chosen approximation is due to calculations of shieldings for piping and spherical/cylindrical containers. Surface sources built up by radioactive deposits can be estimated.

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8. RELATED AND AUXILIARY PROGRAMS

There are no programs related with the PRESTO code. It is possible to get input data for energy group calculation with PRESTO IA from other codes.

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9. STATUS

Package ID	Status date	Status
IAEA0905/01	09-MAY-1989	Tested at NEADB

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10. REFERENCES

- Jaeger R.G. et Al.,
  Engineering Compendium on Radiation Shielding, Volume 1,
  Springer Verlag Berlin (1968).
- Weidemann W. et Al.,
  Kernenergie (21), 4 (1978).
- Buscaglione S. et Al.,
  Build-up Factors: Coefficients of the Equation of J.J. Tyalor
  Report ORNL-TR-80 (Rev.) RT/FI (65) 7/, 1965, m. in /1/.
- Gusev N.G. , P.P. Dmitriev,
  Kvantovoje Izlucenije Radioaktivnych Nuklidov,
  Sprarocnik, Moskva Atomizdat 1977.

IAEA0905/01, included references:

- W. Weidemann, U.E. Michaelis and G. Siewczynski:
  PRESTO - A Program System for Shielding Calculations of
  Cylindrical and Spherical Gamma Sources.
  (1984) (In German)

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11. MACHINE REQUIREMENTS

- high speed memory: PRESTO I/II/Ia 20 to 30 K-words
- auxiliary drum storage: PRESTO I    50 000 words
                          PRESTO II   90 000 words
                          PRESTO IA   60 000 Words
- data input: from card reader or tape
- output: printer, plotter (PRESTO II)

IAEA0905/01

The test case runs on a VAX 8819 computer in 5054K bytes (9872 pages) of main storage.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA0905/01	FORTRAN

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

BAMOS - Version 02.01.1984
- library routines/functions
RREAD/RWRITE: transfer to/from external
VIEL : Curve print routine

IAEA0905/01

VMS V5.0-1 (VAX 8810).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

         W. Weidemann, U.E. Michaelis, G. Siewczynski
         VEB Kombinat Kraftwerksanlagenbau
         Berlin, GDR

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16. MATERIAL AVAILABLE

IAEA0905/01

File name	File description	Records
IAEA0905_01.001	Information file	99
IAEA0905_01.002	Source of PRESTO1	1134
IAEA0905_01.003	Source of PRESTO1A	593
IAEA0905_01.004	Source of PRESTO2	1867
IAEA0905_01.005	Input data of PRESTO1	8
IAEA0905_01.006	Input data of PRESTO1A	30
IAEA0905_01.007	Input data of PRESTO2	22
IAEA0905_01.008	Output of PRESTO1	1494
IAEA0905_01.009	Output of PRESTO1A	1112
IAEA0905_01.010	Output of PRESTO2	826

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17. CATEGORIES

J. Gamma Heating and Shield Design

Keywords: gamma radiation, gamma spectra, shielding, shields, time-dependent.