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[Program Service | Recent programs]

NEA-0393 CARNAC. (Abstract last modified 01-OCT-1976)


CARNAC, Neutron Flux and Neutron Spectra in Criticality Accident

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - CARNAC.


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.

Program-name         Package-ID  Status
CARNAC               NEA-0393/01 Tested

Machines used:
Package-ID     Orig.Computer                       Test Computer
NEA-0393/01    IBM 370 series                      IBM 370 series

3. NATURE OF PHYSICAL PROBLEM SOLVED - Calculation of flux and neutron spectra in the case of a criticality accident.
The method is unsophisticated but fast. The program is divided into  two parts -
(1) The code CRITIC is based on the Fermi age equation and evaluates the neutron number per fission emitted from a moderate critical system and its energy spectrum.
(2) The code NARCISSE uses concrete current albedo, evaluates the product of neutron reflection on walls of the source containment and calculates the resulting flux at any point, and its energy distribution into 21 groups. The results obtained seem satisfactory, if compared with a Monte Carlo program.


4. METHOD OF SOLUTION -


5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM -


6. TYPICAL RUNNING TIME -
Times are for an IBM 360/91 -
CRITIC calculation - less than 30 seconds.
NARCISSE calculation - 3 minutes for flux evaluation at one point chosen inside the containment.


7. UNUSUAL FEATURES OF THE PROGRAM -


8. RELATED AND AUXILIARY PROGRAMS -


9. STATUS
NEA-0393/01: 01-OCT-1976 Tested at NEADB


10. REFERENCES  - 
NEA-0393/01:
- J.Bessis:
  Calcul rapide du flux et du spectre neutroniques en cas d'accident
  de criticite (programme CARNAC)
  CEA-N-1612 (May 1973).
- J.Bessis and M. de Mareuil:
  Notice D'exploitation du Programme de Calcul CARNAC
  NOTE S.E.S.R. No. 5 (14 Mars 1973).
- J. Bessis:
Note CEA-N-1612 translated into English ORNL-tr-2825


11. MACHINE REQUIREMENTS -


12. PROGRAMMING LANGUAGE(S) USED -
NEA-0393/01: FORTRAN-IV 


13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED -


14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -


15. NAME AND ESTABLISHMENT OF AUTHOR -
   J.Bessis
   Departement de Surete Nucleaire
   Commissariat a l'Energie Atomique.


16. MATERIAL AVAILABLE -
NEA-0393/01:
NEA0393_01.001    SOURCE PROGRAM (F4)                EBCDIC         746 records
NEA0393_01.002    SAMPLE PROBLEM INPUT DATA                         127 records
NEA0393_01.003    SAMPLE PROBLEM PRINTED OUTPUT                    1460 records


17. CATEGORIES  - 

- G.  Radiological Safety, Hazard and Accident Analysis


Keywords: ACCIDENTS, ALBEDO, CRITICALITY, NEUTRON FLUX, NEUTRON SPECTRA, REACTOR SAFETY

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