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NEA-0745 TRAP-SCO-2.

TRAPSCO-2, Pressure and Temperature Transients in PWR Subcompartments During LOCA

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1. NAME OR DESIGNATION OF PROGRAM:  TRAP-SCO-2.
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2. COMPUTERS
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Program name Package id Status Status date
TRAPSCO-2 NEA-0745/01 Tested 01-FEB-1984

Machines used:

Package ID Orig. computer Test computer
NEA-0745/01 IBM 3081 IBM 3081
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3. DESCRIPTION OF PROBLEM OR FUNCTION

Evaluation of the pressure and  temperature history during the short term following a break of a high energy line in order to design the compartment walls and ensure their integrity.
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4. METHOD OF SOLUTION

Conservation of mass and energy are solved in a finite difference solution using the predictor-corrector method (Simpson integration). Conservation of momentum is solved for problems involving inertial-frictional effects. The program rigorously treats the thermodynamics of two-phase components mixtures of water and an inert gas and contains three critical flow  options (homogeneous, MOODY, HENRI-FAUSKE) options include: Discharge coefficient, water entrainment, fly-out panels.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

TRAP-SCO-2: 20 nodes - 60 branches
Limited to complete thermodynamic equilibrium in the nodes.
No heat transfer to cold walls.
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6. TYPICAL RUNNING TIME

Validation experiment (CASP-2): 6 nodes, 7 branches, 2.5 set problem time required 34.5 CPU seconds on a IBM 370/3031 Mbyte system.
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7. UNUSUAL FEATURES OF THE PROGRAM

The program is especially designed to treat depressurization phenomena for high pressure water-vapour systems during the initial phases whereby heat transfer effects can  be ignored.
Different initial thermodynamic conditions may be specified for each node ranging from atmospheric pressure to 165 bar for saturated water to overheated vapour.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NEA-0745/01 01-FEB-1984 Tested at NEADB
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10. REFERENCES

- ZOCO V: Nuclear Engineering and Design Vol. 23, 1972.
- F.J. Moody,
  Maximum Flow Rate of a Single Component, Two Phase Mixture,
  Transactions of the ASME - February 1965.
- R. Henry, H.K. Fauske,
  Two Phase Critical Flow of One Component Mixtures in Nozzles,
  Orifices and Short Tubes.
  Journal of Heat Transfer, May 1971.
- C.W. Savery et al.,
  Subcompartment Analysis of High Energy Pipe Ruptures,
  Nuclear Technology November 1975.
- E.J. Stubbe, J. Robeyns, A. Danguy (Tractionel)
TRAP: Computer Codes for the Evaluation of the Pressure Transients    in the Subcompartments (TRAP-SCO) and the Containment (TRAP-CON)
  of a Reactor Plant Following a High Energy Line Break,
  Proceedings of the ENS/ANS international Topical Meeting on
  Nuclear Power Reactor Safety,
  Brussels, October 1978, Vol III p.2168.
- W. Winkler,
  Comparison Report on OECD-CSNI Containment Standard Problem no 1,
  CSNI Report no 41, 1980.
- D.L. Ngyuen,
  Comparison Report on OECD-CSNI Containment Standard Problem no 2,
  CSNI Report no 65 (DRAFT) 1981.
NEA-0745/01, included references:
- E. Stubbe et A. Danguy:
  Programme TRAPSCO-2: Analyse a court terme des surpressions entre
  logettes dans l'enceinte d'une centrale nucleaire suite a un
  accident LOCA.  51257/NT/NU/TC-0324  (March 25,1982).
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11. MACHINE REQUIREMENTS:  256K bytes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0745/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  STANDARD IBM 360  or 370 OPERATING SYSTEM.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

E. Stubbe, Mme Danguy
Tractionel
31 rue de la Science
1040 Bruxelles
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16. MATERIAL AVAILABLE
NEA-0745/01
File name File description Records
NEA0745_01.003 TRAPSCO-2 INFORMATION FILE 60
NEA0745_01.004 TRAPSCO-2 SOURCE (CARD-IAMAGES) 3105
NEA0745_01.006 TRAPSCO-2 JCL FOR TEST CASE 55
NEA0745_01.007 TRAPSCO-2 INPUT DATA FOR TEST CASE 64
NEA0745_01.008 TRAPSCO-2 OUTPUT OF TEST CASE 1446
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: accidents, containment, failures, flow models, fluid flow, pressure, pressure gradients, reactor safety, temperature gradients, thermodynamics, transients, two-phase flow.