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NESC0521 SOCOOL2

SOCOOL-2, Molten Materials Na Coolant Interaction, Temperature and Pressure Transient

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1. NAME OR DESIGNATION OF PROGRAM:  SOCOOL2
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2. COMPUTERS
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Program name Package id Status Status date
SOCOOL-2 NESC0521/02 Tested 01-NOV-1973

Machines used:

Package ID Orig. computer Test computer
NESC0521/02 IBM 370 series IBM 370 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

SOCOOL2    calculates     the
transient temperatures, pressures, and mechanical work energy when
a molten  material is instantaneously  and uniformly  dispersed in
liquid sodium which is initially under acoustic constraint.
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4. METHOD OF SOLUTION

A unit cell consisting  of a single spherical
particle of molten material surrounded concentrically by sodium is
used as  the basis  for the calculation.   Heat transfer  from the
molten  particle  to  the  sodium is  calculated  by  an  implicit
numerical technique assuming negligible  contact resistance at the
interface of the particle.  The expansion  of the heated sodium is
calculated  by   the  one-dimensional   acoustic  equation   until
vaporization conditions  are attained.   Upon vaporization,  it is
assumed  that the  particle becomes  vapor-blanketed  and that  no
further heat  transfer to or from  the sodium occurs.   The heated
sodium  is then  expanded to  the  specific final  pressure in  an
isentropic expansion process.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The presence of an
initial amount  of sodium  vapor or  noncondensible gas  cannot be
taken into account.   Time delays in the  process of fragmentation
and  mixing of  the  molten material  into  the  sodium cannot  be
considered.   Heat  transfer  during the  two-phase  expansion  of
sodium is neglected.
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6. TYPICAL RUNNING TIME

The   sample   problem  executed   on   the
UNIVAC1108 in 10 seconds, on the IBM360/75 in 15 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM

The    program   has    built-in
thermophysical properties  when the molten  material is  25% PuO2,
75% UO2  and the  user has  the option  of calculating  the sodium
properties according to three different methods.
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8. RELATED AND AUXILIARY PROGRAMS

SOCOOL2 is  a continuation  in an
analysis  program  to  predict  the  mechanical  work  energy  for
hypothetical LMFBR  maximum accidents.   SOCOOL1 was  a completely
thermodynamic model whereas SOCOOL2 takes  into account the finite
rate of heat transfer.
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9. STATUS
Package ID Status date Status
NESC0521/02 01-NOV-1973 Tested at NEADB
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10. REFERENCES

A. Padilla,  Jr., Mechanical  Work Energy  for Sodium
Fuel Interaction, HEDL-TME-71-94, June 1971.
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11. MACHINE REQUIREMENTS

UNIVAC1108 - 19K words  of memory, IBM360 -
115K bytes of memory
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0521/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:             CSCX
(UNIVAC1108), OS/360 (IBM360).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 A. Padilla, Jr.
                 Reactor Analysis and Safety Division
                 Argonne National Laboratory
                 9700 South Cass Avenue
                 Argonne, Illinois  60439
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16. MATERIAL AVAILABLE
NESC0521/02
File name File description Records
NESC0521_02.001 SOURCE PROGRAM (FORTRAN) 941
NESC0521_02.002 SAMPLE PROBLEM 5
NESC0521_02.003 SAMPLE OUTPUT 99
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow
  • Q. Materials.

Keywords: LMFBR reactors, accidents, containment, excursions, fuels, reactor safety, vapors.