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NEA-0251 PREST.

PREST, Pressure Temperature Transients, I Inhalation in Containment Building from LOCA

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1. NAME OR DESIGNATION OF PROGRAM:  PREST.
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2. COMPUTERS
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Program name Package id Status Status date
PREST NEA-0251/01 Tested 01-JUN-1969

Machines used:

Package ID Orig. computer Test computer
NEA-0251/01 IBM 360 series IBM 360 series
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3. NATURE OF PHYSICAL PROBLEM SOLVED

The programme is intended for the determination of pressure and temperature transient inside the containment building, following a loss-of-coolant accident due to a  rupture in the primary cooling system of a nuclear power plant having water as the primary coolant. The model includes the calculation of the radiation doses incurred to the thyroid due to inhalation of radioactive iodine released outside the containment building.
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4. METHOD OF SOLUTION

The energy equation is solved at each time step  by using the Newton method. In order to determine the heat exchange  with structures inside the containment building as well as with the  outside atmosphere, the structures are treated in slab geometry.
The resulting Fourier equations for heat conduction are solved numerically by using an implicit form to avoid stability problems.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

   max. number of internal slabs - 6
   max. number of external slabs - 4
   max. number of meshes in each slab - 100.
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6. TYPICAL RUNNING TIME:  About 10 minutes for a typical 24 hours transient.
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7. UNUSUAL FEATURES OF THE PROGRAM

The mathematical model adopted allows both the blowdown phase of the primary coolant and the subsequent phase of the accident to be studied. The programme may account for the presence of the consequence-limiting engineered safeguards, such as internal and/or external spray systems.
Plots of pressure, temperature, and integrated dose-rate versus time may be obtained by means of the CALCOMP device.
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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-0251/01 01-JUN-1969 Tested at NEADB
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10. REFERENCES

- G. Gaggero, P.M. Gerini, G. Leoni, J.B. Van Erp:
"MACACO-PREST", An Analog Model and a Digital Code for Containment    Studies
  EUR 3927.E (1968).
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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0251/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  O.S. IBM 360/65.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  The programme needs the CALCOMP subroutine package.
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15. NAME AND ESTABLISHMENT OF AUTHOR

G. Gaggero  - CETIS, EURATOM C.C.R., 21020 - Ispra (Varese) Italy
P.M. Gerini - CISE, Segrate (Milano) Italy.
G. Leoni    - AGIP Nucleare, San Donato Milanese (Milano) Italy.
J.B. Van Erp- EURATOM C.C.R., 21020 - Ispra (Varese) Italy.
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16. MATERIAL AVAILABLE
NEA-0251/01
File name File description Records
NEA0251_01.001 SOURCE & DATA 360/65 1865
NEA0251_01.002 OUTPUT 642
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • H. Heat Transfer and Fluid Flow

Keywords: blowdown, containment, doses, heat transfer, loss-of-coolant accident, power plants, pressure, reactor safety, slabs, temperature, transients.