NEA-0982 FRETA-B.

FRETA-B, LWR Fuel Rod Bundle Behaviour During LOCA

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM 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 AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FRETA-B.

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2. COMPUTERS

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Program name	Package id	Status	Status date
FRETA-B	NEA-0982/02	Tested	05-MAY-1992

Machines used:

Package ID	Orig. computer	Test computer
NEA-0982/02	FACOM M-780	IBM 3090

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3. DESCRIPTION OF PROGRAM OR FUNCTION

FRETA-B analyzes the behaviour of LWR fuel rods under accident conditions, espcially loss-of- coolant accident. The program treats thermal (radiative heat transfer) and mechanical (contact due to ballooning) interactions between multiple rods in a bundle.

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4. METHOD OF SOLUTION

The method of weighted residuals is used for heat conduction in each rod. The finite element method is used for most other models. No iterations are performed for transient calculations.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of fuel rods is 17; the maximum number of axial segments is 9. Azimuthal nodes are fixed at 4.

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6. TYPICAL RUNNING TIME: The sample problems runs on FACOM M-380 in 2.4 minutes.

NEA-0982/02

NEADB executed the test case included in this package in 46 seconds of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
NEA-0982/02	05-MAY-1992	Tested at NEADB

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10. REFERENCES

- M. Uchida:
"Application of a Two-Dimensional Ballooning Model to Out-Pile and     In-Pile Simulation Experiments"
  Nucl. Eng. Des. 77 (1984) 37-47
- M. Uchida, J. Nakamura, and N. Otsubo:
  "FRETA-B: A Computer Code for the Analysis of Fuel Rod Bundle
  Behavior Under Accident Conditions"
  JAERI-M 9495 (1981)

NEA-0982/02, included references:

- M. Uchida and N. Otsubo:
  Models of Multi-Rod Code FRETA-B for Transient Fuel Behaviour
  Analysis (Final Version)
  JAERI 1293  (November 1984)

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11. MACHINE REQUIREMENTS: Work disks and a plotter.

NEA-0982/02

Execution of the test case on an IBM 3090 required about 1800K bytes of main storage.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0982/02	FORTRAN-77

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

NEA-0982/02

MVS/DFP with compiler VS FORTRAN LEVEL 2.5.0 (IBM3090).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

         M. Uchida
         Division of Nuclear Safety Research
         Japan Atomic Energy Research Institute
         Tokai-mura, Japan

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16. MATERIAL AVAILABLE

NEA-0982/02

File name	File description	Records
NEA0982_02.001	Information file	102
NEA0982_02.002	JCL example for compilation, linkage, run	129
NEA0982_02.003	FRETA-B FORTRAN source	12977
NEA0982_02.004	Sample case input data	94
NEA0982_02.005	Sample case printed output (by the author)	3532
NEA0982_02.006	Sample case printed output (by NEA/DB)	3510

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17. CATEGORIES

G. Radiological Safety, Hazard and Accident Analysis

Keywords: LWR reactors, accidents, fuel rods, loss-of-coolant accident, rod bundles.