Computer Programs

NEA-0904 PRECIP-2.

NEA-0904 PRECIP-2.

PRECIP-2, Zircaloy Cladding Oxidation Simulation for LWR under LOCA Conditions

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROBLEM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: PRECIP-2.

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2. COMPUTERS

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Program name	Package id	Status	Status date
PRECIP-2	NEA-0904/01	Tested	19-MAY-1983

Machines used:

Package ID	Orig. computer	Test computer
NEA-0904/01	IBM 370/168	IBM 370/168

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3. DESCRIPTION OF PROBLEM OR FUNCTION

PRECIP-2 simulates zircaloy cladding oxidation under LOCA conditions of LWR's. The code calculates oxygen concentration distribution across the cladding wall by solving the diffusion equation with moving boundary conditions, taking into account the structure change of the beta- phase, i.e. alpha precipitation during the cooling period. The code also predicts total oxygen uptake, thicknesses of alpha, beta and oxide layers.

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4. METHOD OF SOLUTION

The finite difference method is used to solve both diffusion equations and the heat transfer equation with moving boundary conditions.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of radial nodes in the cladding is 1000. The calculation is done in cylindrical coordinates.

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6. TYPICAL RUNNING TIME: The sample case runs in 42 seconds on the FACOM M-200.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
NEA-0904/01	19-MAY-1983	Tested at NEADB

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10. REFERENCES

- S. Malang:
  "SIMTRAN I - A Computer Code for the Simultaneous Calculation of
   Temperature Profiles in Zircaloy During Exposure to High
   Temperature Oxidizing Environments"
   ORNL-5083, November l975

NEA-0904/01, included references:

- M. Suzuki, S. Kawasaki and T. Furuta:
  Computer Code PRECIP-2 for the Calculation of Zr-Steam Reaction
  Comparison of Calculation and Experiment.  JAERI-M 7720 (May 1978)
- M. Suzuki and S. Kawasaki:
  Development of Computer Code PRECIP-2 for Calculation of Zr-Steam
  Reaction - Comparison of Calculation with Experiments in
  Temperature Transient.  Reprint from 'Journal of NUCLEAR SCIENCE
  and TECHNOLOGY' Vol. 17, No. 4, pp. 291-300, April 1980

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0904/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED: FACOM M-200, OS-4,F4.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

M. Suzuki, S. Kawasaki and T. Furuta
Division of Nuclear Safety Research
Tokai Research Establishment
Japan Atomic Energy Research Institute

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16. MATERIAL AVAILABLE

NEA-0904/01

File name	File description	Records
NEA0904_01.003	PRECIP-2 INFORMATION FILE	91
NEA0904_01.004	PRECIP-2 SOURCE (FORTRAN-4)	4046
NEA0904_01.005	INFILQ SUBROUTINE (ASSEMBLER)	98
NEA0904_01.006	PRECIP-2 JCL	19
NEA0904_01.007	PRECIP-2 INPUT DATA FOR TEST CASE	26
NEA0904_01.008	PRECIP-2 OUTPUT OF TEST CASE	652

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17. CATEGORIES

G. Radiological Safety, Hazard and Accident Analysis
Q. Materials

Keywords: LWR reactors, cladding, diffusion, loss-of-coolant accident, simulation, zircaloy.