Computer Programs

NEA-1339 PEPIN.

NEA-1339 PEPIN.

PEPIN, Methodology for Computing Concentrations, Activities, Gamma-Ray Spectra, and Residual Heat from Fission Products.

NAME, COMPUTER, PROBLEM, SOLUTION, RESTRICTIONS, CPU, STATUS, REFERENCES, LANGUAGE, AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM

PEPIN

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Rules for end-users are available here.

Program name	Package id	Status	Status date
PEPIN	NEA-1339/01	Tested	12-APR-2001

Machines used:

Package ID	Orig. computer	Test computer
NEA-1339/01	IBM 360 series	PC Pentium II 450,DEC ALPHA W.S.

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3. DESCRIPTION OF PROGRAM OR FUNCTION

The concentrations, activities, gamma-ray spectra and residual heat from fission products can be calculated as a function of time for instantaneous fission or for one or more irradiation steps.

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4. METHODS

Using the basic data in the libraries, the PEPIN code solves the differential equations satisfied by the fission product concentrations.

Data Libraries:

Independent Yields Library: 8 independent yields for 235U, 238U, 239U, 232U, 233U.

Chain library: Precursor chain file for 635 nuclides.

Gamma-Ray Energies Library: Average beta and gamma-ray energies in increasing order.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

NEA-1339/01

The number of nuclides must not exceed 650.
The number of Gamma-Rays must not exceed 8500.
The number of decay times must not exceed 59.
The number of irradiation steps must not exceed 40.

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6. TYPICAL RUNNING TIME

NEA-1339/01

A few seconds on an Intel Pentium II 450MHz.

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9. STATUS

Package ID	Status date	Status
NEA-1339/01	12-APR-2001	Tested at NEADB

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10. REFERENCES

NEA-1339/01, included references:

- B. Duchemin and C. Nordborg:
Decay Heat Calculation - An International Nuclear Code Comparison
NEACRP-319 "L", NEANDC-275 "U" (April 1990).
- "Description of the Pepin Library" Informal notes.
- "Pepin Input Data" Informal notes.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-1339/01	FORTRAN-95

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15. NAME AND ESTABLISHMENT OF AUTHORS

CEA Saclay, France

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16. MATERIAL AVAILABLE

NEA-1339/01

PEPIN.EXE compressed file containing the list below:
F01 INDEPENDENT YIELDS LIBRARY
F02 CHAIN LIBRARY
F03 GAMMA-RAY ENERGIES LIBRARY
F04 PEPIN JCL
F05 PEPIN FORTRAN IV SOURCE
F06 PEPIN OVERLAY CARDS
F07 PEPIN DD CARDS
F08 PEPIN SAMPLE INPUT
F09 EDIT JCL
F10 EDIT FORTRAN IV SOURCE
F11 EDIT DD CARDS
F12 PEPIN SAMPLE OUTPUT
F13 EDIT SAMPLE OUTPUT

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17. CATEGORIES

D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics
J. Gamma Heating and Shield Design

Keywords: concentration, decay heat, fission products.