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IAEA0804 TRIFIDO. (Abstract last modified 01-SEP-1976)
1.
NAME OR DESIGNATION OF PROGRAM - TRIFIDO. 2.
COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -
To request or retrieve programs click on the one of the active versions below.
A password and special authorization is required. Explanation of the status codes.
Machines used:
Package-ID Orig.Computer Test Computer
IAEA0804/01 IBM 370 series IBM 370 series
3.
NATURE OF PHYSICAL PROBLEM SOLVED - The program calculates decay constants and the population of the fundamental prompt neutron mode extrapolated to initial time, using pulsed neutron experimental data. This data is the resulting time profile of the neutron density of a subcritical multiplicative assembly which is repetitively pulsed with short bursts of neutrons. The time profile is measured with an appropriate detector and recorded with a time analyser. 4.
METHOD OF SOLUTION - Least-squares weighted fit for the decay constant and extrapolated population calculation. Iteration for the Garelis-Russell method. 5.
RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - The program is presently restricted to 256 experimental point data (for example those provided by ATMC multichannel analyser). This is adequate for most pulsed neutron measurements. The restriction can be easily overcome if necessary by changing a DIMENSION card. Minor parameter adjustments are needed according to the multiplying system used and to the experimental procedure. 6.
TYPICAL RUNNING TIME - This time depends mainly on the number of cases processed in one run. Table 1 gives typical processor times on an IBM/360-65 computer, operating system OS/360 with MVT, FORTRAN IV G compiler, and on a BULL GE-625 computer, operating system GECOS 3, FORTRAN IV compiler. 7.
UNUSUAL FEATURES OF THE PROGRAM - It calculates several pairs of quantities such as the decay constant and the extrapolated population of the fundamental prompt neutron mode as a function of the starting analysis channel (initial time). Since the program selects as fundamental prompt mode those values which provide the best agreement between fitted and experimental data, it can proceed directly to calculate kbeta/l and reactivity values. Thus all these kinetic parameters are obtained in just one computer run. In order to provide a visual checking, the program draws a graphic of the experimental data corrected for noise and dead time effects and fitted values. 8.
RELATED AND AUXILIARY PROGRAMS - 9.
STATUS 10.
REFERENCES - 11.
MACHINE REQUIREMENTS - 10k core on BULL GE-625 12.
PROGRAMMING LANGUAGE(S) USED - 13.
OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED - GECOS 3 on BULL GE-625; OS/360 on IBM/360. 14.
ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 15.
NAME AND ESTABLISHMENT OF AUTHOR - F. Difilippo and N. Pieroni 16.
MATERIAL AVAILABLE - 17.
CATEGORIES - Keywords: DECAY, LEAST SQUARE FIT, NEUTRON SPECTRA, PULSED NEUTRON TECHNIQUES, REACTIVITY
Program-name Package-ID Status
TRIFIDO IAEA0804/01 Tested
With the calculated parameters the program determines the values of kbeta/l and reactivity by means of the Garelis-Russell method, and reactivities using the Gozani and Sjostrand methods.
Table 1
Typical Processor Time
Number of Cases Processor Time on Processor Time on IBM/360-65 (sec) BULL GE-625 (sec) in one run
1 2.54 3.60
4 4.78 7.92
10 12.30 16.92
IAEA0804/01: 01-SEP-1976 Tested at NEADB
- E. Garelis and J.L.Russell:
Nucl.Sci.Eng.16, 263(1963).
- T.Gozani:
EIR-Bericht NR. 79 (April 1965).
- N.G. Sjostrand:
Ark.Fys. 11, 233 (1957).
IAEA0804/01:
11k core on IBM/360-65
IAEA0804/01: FORTRAN-IV
CNEA
Departamento de Reactores
Av.Da del Libertador 8250
Buenos Aires (Argentina)
IAEA0804/01:
IAEA0804_01.001 SOURCE PROGRAM (F4) EBCDIC 428 records
IAEA0804_01.002 SAMPLE PROBLEM INPUT DATA 6 records
IAEA0804_01.003 SAMPLE PROBLEM PRINTED OUTPUT 131 records
- O. Experimental Data Processing
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