NEA-0810 FORM-OTA.

FORM-OTA, MultiGroup Constant for Epithermal Neutron Slowing-Down in Homogeneous Media

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM 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 AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FORM-OTA.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
FORM-OTA	NEA-0810/01	Tested	21-SEP-1982
FORM-OTA	NEA-0810/02	Tested	21-DEC-1984

Machines used:

Package ID	Orig. computer	Test computer
NEA-0810/01	CDC CYBER 174	CDC CYBER 174
NEA-0810/02	UNIVAC 1108	UNIVAC 1100

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3. DESCRIPTION OF PROBLEM OR FUNCTION

FORM-OTA performs a multi- group slowing down calculation for a fundamental mode of given buckling in a homogeneous medium to obtain space-independent energy spectra for the epithermal neutron flux and current. Using the calculated flux and current spectra the program produces group constants for desired few group schemes.

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4. METHOD OF SOLUTION

FORM-OTA is a member of the MUFT family of programs. The one-dimensional transport equation for the flux in plane geometry is solved by removing the spatial dependence by a Fourier transformation and by treating the angular dependence in either B1- or P1-approximation. Elastic slowing-down by hydrogen can be solved in an exact manner using a differential equation formulation. Elastic slowing-down by all non-hydrogen elements is lumped together and treated in the Greuling-Goertzel approximation. For resonance absorption a rather simple formulation is used. A flux peaking in the fuel can be assessed, too. The energy group structure (54 groups in the range 10 MeV - .625 eV) is preprogrammed into the code. A facility is provided to modify library data and to introduce entirely new data at run-time.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum 18 elements (isotopes) in a mixture.
Of these 18 elements maximum 10 elements can have resonance data.
Maximum 6 few group schemes.
Maximum 25 group in any few group scheme.
Maximum 25 groups in a heterogeneous two-region (fuel-moderator) calculation.

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6. TYPICAL RUNNING TIME

NEA-DB required the following CP times for the execution of the test cases on CDC CYBER 174:
          FORM-OTA:       4 seconds
          FORMLIST:      37 seconds
          FORMCONV:      32 seconds.
To run the test case on UNIVAC 1100, 2.9 CP seconds were required.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS

ETOF: a program to generate data for the FORM-OTA data library.

NEA-0810/01

FORMLIST
LIBCON1
LIBCON3

NEA-0810/02

FORMLBMD Library update program
FORMLBPR library list program
LIBCON3
LIBCON1

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9. STATUS

Package ID	Status date	Status
NEA-0810/01	21-SEP-1982	Tested at NEADB
NEA-0810/02	21-DEC-1984	Tested at NEADB

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10. REFERENCES:

NEA-0810/01, included references:

-  P. Siltanen
    FORM: A Multigroup Code for Calculating the fundamental Mode
          Flux and Current Spectra of Fast Neutrons. Report 6 (1973)

NEA-0810/02, included references:

-  P. Siltanen
    FORM: A Multigroup Code for Calculating the Fundamental Mode
          Flux and Current Spectra of Fast Neutrons. Rep. 6 (1973)

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11. MACHINE REQUIREMENTS

Main storage on CDC CYBER 174:
          FORM-OTA:     114,000
          FORMLIST:      24,700
          FORMCONV:      24,700 (octal) words.
Main storage on UNIVAC 1100: 32,004 (decimal) words.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0810/01	FORTRAN-77
NEA-0810/02	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
UNIVAC 1108 EXEC 8.
CDC CYBER 174: NOS 1.4-531.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHOR

          P. Siltanen
          Technical Research Centre of Finland
          Nuclear Engineering Laboratory
          Vuorimiehentie 5
          02150 Espoo 15
          Finland

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16. MATERIAL AVAILABLE

NEA-0810/01

File name	File description	Records
NEA0810_01.003	FORM-OTA INFORMATION FILE	81
NEA0810_01.004	LIBCONV SOURCE (FORTRAN77)	52
NEA0810_01.005	LIBCONV JCL FOR FORM-OTA LIB GENERATION	12
NEA0810_01.006	LIBRARY IN FORMATTED FORM	5754
NEA0810_01.007	FORM-OTA SOURCE (FORTRAN77)	1743
NEA0810_01.008	FORM-OTA JCL FOR TEST CASE	11
NEA0810_01.009	FORM-OTA INPUT FOR TEST CASE	16
NEA0810_01.010	FORM-OTA OUTPUT OF TEST CASE	177
NEA0810_01.011	FORMLIST SOURCE (FORTRAN77)	84
NEA0810_01.012	FORMLIST JCL FOR LIBRARY LISTING	11
NEA0810_01.013	FORMLIST OUTPUT OF LIBRARY LIST RUN	6508

NEA-0810/02

File name	File description	Records
NEA0810_02.003	FORM-OTA INFORMATION FILE	36
NEA0810_02.004	JCL	42
NEA0810_02.005	FORM-OTA SOURCE PROGRAM	1732
NEA0810_02.006	FORMLBMD SOURCE PROGRAM	566
NEA0810_02.007	FORMLBPR SOURCE PROGRAM	83
NEA0810_02.008	LIBCON3 SOURCE PROGRAM	49
NEA0810_02.009	LIBCON1 SOURCE PROGRAM	49
NEA0810_02.010	FORM-OTA TEST CASE INPUT DATA	16
NEA0810_02.011	DATA LIBRARY (FORMATTED)	5754
NEA0810_02.012	FORM-OTA TEST CASE PRINTED OUTPUT	177

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17. CATEGORIES

B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: epithermal neutrons, group constants, multigroup, neutron flux, neutron spectra, one-dimensional, slowing-down.