last modified: 24-MAR-1981 | catalog | categories | new | search |

NEA-0567 CORAN.

CORAN, PWR and BWR Containment Response to LOCA

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1. NAME OR DESIGNATION OF PROGRAM:  CORAN. A lumped parameter code for containment response analysis due to a loss-of-coolant accident  taking into account conductors as heat sinks.
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2. COMPUTERS
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Program name Package id Status Status date
CORAN NEA-0567/01 Tested 24-MAR-1981

Machines used:

Package ID Orig. computer Test computer
NEA-0567/01 IBM 370/168 IBM 370/168
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3. NATURE OF PHYSICAL PROBLEM SOLVED

Thermodynamic analysis of an entire containment as well as subcompartment analysis due to a LOCA  in PWR and BWR containments in lumped parameter form can be performed with the code. Heat transfer to containment structures of  plane, cylindrical and/or spherical geometry can be simulated in order to get best estimate results. Mass and energy balances are solved for the subcompartments and the thermodynamic properties are  evaluated by an implicit method. One-dimensional quasi-steady flow is assumed.
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4. METHOD OF SOLUTION

The set of differential equations is solved by predictor methods of  the Adams type with the following algorithms:
a)  Core integrator for advancing the solution from step to step.
b)  Method for starting the integration.
c)  Algorithm for changing the step size.
d) Algorithm for deciding when and by how much to change the step     size based on the accuracy requested by the user.
e)  Test for stability of the numerical method.
f) Test for accuracy requests which cannot be met because of round-      off errors.
g) Automatic selection of the core integrator to fit the     characteristics of the problem at hand.
h) Algorithm for obtaining dependent variable values at arbitrary     values of independent variable.
i) Algorithm for locating the zeros of arbitrary functions of the     variables appearing in the differential equations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Due the variable dimensioning of the code the complexity of the problem is only restricted by the fast memory size.
The array 'A' contains all data necessary for thermodynamic calculations.
Its length is dependent on:
    NZ number of subcompartments
    NW number of junctions
    NP number of variables to be stored for plotting (presently NP=2*NW+4*NZ+1)
    ND number of differential equations
       ND = 4+NZ    for PWR
       ND = 4+NZ+2  for BWR
    NB number of breaks at the reactor
NV number of value-pairs for mass and energy release rates        dimension of A = (6+3*NB*NV+3*NW+23*NZ+4*ND+NP)
The array 'S' contains all information for solution of heat transfer to and conduction inside structures, its length depends on:
    NK number of structures to be simulated
    NM maximum number of different materials in a structure
    NSM maximum number of slabs of a structure dimension of S =
       (NK*(23+9*NM+11*NSM))
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6. TYPICAL RUNNING TIME

For calculation with constant step size
     CPU(s) =(K*NZ*NK)/timestep
     NZ = number of subcompartments
     NK = number of heat conductors
      K = 2.5 msec for Telefunken TR 440
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7. UNUSUAL FEATURES OF THE PROGRAM:  Single precision for the entire code.
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8. RELATED AND AUXILIARY PROGRAMS

If plotting of the calculated values is desired, the values can be saved in auxiliary storage. A plotting  routine itself is not implemented in the code.
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9. STATUS
Package ID Status date Status
NEA-0567/01 24-MAR-1981 Tested at NEADB
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10. REFERENCES

- F.T.Krogh:
  VODQ/SVDQ/DVDQ - Variable Order Integrators for the Numerical
  Solution of Ordinary Differential Equations
  NPO - 11643
The code CORAN has been applied to experiments of the German Research Programme RS 33 and RS 50. Several unpublished reports are available via the author. Calculations performed for the German Containment Standard Problem No. 1 and its results will be published by the Ministry of Interior of the Federal Republic of Germany.
NEA-0567/01, included references:
- H. Schwan:
  Containment-Code CORAN (Benutzerhandbuch - in German)
  GKSS 78/I/29 (1978)
- H. Schwan:
  Analytical Simulation of Containment During LOCA (in German)
  GKSS 78/E/36 (1978)
- H. Schwan:
  CORAN - A Modular Code for the Analysis of Containments During
  LOCA with Heat Sinks (in German)
  GKSS 78/E/44 (1978)
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11. MACHINE REQUIREMENTS

Fast memory of approx. 50k words
line printer (156 columns)
auxiliary storage for saving data (see point 8)
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0567/01 FORTRAN-IV
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  Standard.
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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:  For  the output the line printer requires 156 columns.
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15. NAME AND ESTABLISHMENT OF AUTHOR

   Henning Schwan,
   GKSS-Forschungszentrum Geesthacht
   Institut fur Anlagentechnik
   Postfach 160
   D-2054 Geesthacht
   Federal Republic of Germany
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16. MATERIAL AVAILABLE
NEA-0567/01
File name File description Records
NEA0567_01.002 INFORMATION FILE 9
NEA0567_01.003 SOURCE 1482
NEA0567_01.004 S.P. INPUT 167
NEA0567_01.005 S.P. OUTPUT 913
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis
  • H. Heat Transfer and Fluid Flow

Keywords: BWR reactors, containment, cylinders, heat transfer, loss-of-coolant accident, mass balance, pwr reactors, slabs, spheres, thermodynamics.