IAEA0804 TRIFIDO.
TRIFIDO, Decay Constant and Prompt Neutron Calculation from Pulsed Neutron Experiment
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, AUXILIARIES, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES
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| Program name | Package id | Status | Status date |
|---|---|---|---|
| TRIFIDO | IAEA0804/01 | Tested | 01-SEP-1976 |
Machines used:
| Package ID | Orig. computer | Test computer |
|---|---|---|
| IAEA0804/01 | IBM 370 series | IBM 370 series |
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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.
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.
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.
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.
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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.
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.
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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.
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
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.
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
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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.
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.
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IAEA0804/01
| File name | File description | Records |
|---|---|---|
| IAEA0804_01.001 | SOURCE PROGRAM (F4) EBCDIC | 428 |
| IAEA0804_01.002 | SAMPLE PROBLEM INPUT DATA | 6 |
| IAEA0804_01.003 | SAMPLE PROBLEM PRINTED OUTPUT | 131 |
Keywords: decay, least square fit, neutron spectra, pulsed neutron techniques, reactivity.