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ESTS0333 USINT.

USINT, High Temperature Heat and Mass Transfer on Concrete Surfaces in LMFBR

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1. NAME OR DESIGNATION OF PROGRAM:  USINT, heat and mass transfer in
concrete.
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2. COMPUTERS
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Program name Package id Status Status date
USINT ESTS0333/01 Arrived 01-FEB-2002

Machines used:

Package ID Orig. computer Test computer
ESTS0333/01 PC-80286
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3. DESCRIPTION OF PROGRAM OR FUNCTION

USINT was developed to model the thermal response of concrete to very high heating rates such as  might occur from sodium spills on concrete surfaces in a breeder reactor. The major phenomena treated are conductive energy transport; chemical decomposition of concrete; and two-phase, three-component heat and mass transfer of the decomposition products: steam, liquid water, and carbon dioxide. The USINT model provides for porosity to increase as water and carbon-dioxide are formed from the concrete. The concrete is treated generally as divided into two basic regions, wet and dry. In the wet region, steam, carbon-dioxide, and liquid water may co-exist, but in the dry region, there is no liquid water. There is also the possibility of a third region in which there is only liquid water and no gases.
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4. METHOD OF SOLUTION

The finite difference representations of the partial differential equations include several models for Darcy's two-phase flow. The equations for energy and mass transfer of water  and carbon-dioxide are solved by a general implicit procedure that contains the Crank-Nicolson approximation. A modified Calusius-Clayperon equation is used as the equation of state in the  wet region.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
150 times for experimental temperature histories
150 times for experimental pressure histories
150 times for experimental water release
20 thermal conductivities
  5 locations for experimental temperature histories
  4 locations for experimental pressure histories
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6. TYPICAL RUNNING TIME

NESC executed the sample problem in 5 CP seconds on a CDC CYBER170/875 and in 1 minute on an IBM PS/2 Model 70 with a math co-processor.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
ESTS0333/01 01-FEB-2002 Masterfiled Arrived
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10. REFERENCES

- James V. Beck and Richard L. Knight, User's Manual for USINT,
  NUREG/CR-1375 (SAND79-1694), May 1980, with Errata, December
  7,1981.
- James V. Beck, Sensitivity Analysis for USINT--A Program for
  Calculating Heat and Mass Transfer in Concrete Subjected to High
  Heat Fluxes, NUREG/CR-2180 (SAND81-0026), October 1981.
- USINT, NESC No. 1129.C170, USINT CDC Version Tape Description and
  Sample Problem Input and Output, National Energy Software Center
  Note 92-17, October 17, 1991.
- USINT, NESC No. 1129.PS2, USINT IBM PS/2 Version Tape Description
  and Sample Problem Input and Output, National Energy Software
  Center Note 92-18, October 17, 1991.
ESTS0333/01, included references:
- J.V. Beck and R.L. Knight:
  User's Manual for USINT - A Program for Calculating Heat and Mass
  Transfer in Concrete Subjected to High Heat Fluxes
  NUREG/CR-1375, SAND79-1694 (May 1980).
- L. Eyberger:
  USINT PS/2 version Flexible Disk Cartridge Description, and Sample
  Problem Input and Output
  NESC Note 92-18 (October 17, 1991).
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11. MACHINE REQUIREMENTS

61,000 (octal) words on a CDC CYBER170/875 and 177 Kbytes on an IBM PS/2 Model 70.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0333/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  NOS 2.4 (CDC CYBER170), DOS 4.01 (IBM PS/2).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

C 170   J.V. Beck and R.L. Knight
        Sandia National Laboratories, Albuquerque
PS/2    L.R. Eyberger
        National Energy Software Center
        Argonne National Laboratory
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16. MATERIAL AVAILABLE
ESTS0333/01
source program   mag tapeUSINTC.FOR USINT FORTRAN Source            SRCTP
test-case data   mag tapeUSINTC.DAT Sample Problem Input            DATTP
test-case output mag tapeUSINTC.OUT Sample Problem Output           OUTTP
report                   NUREG/CR-1375, SAND79-1694 (May 1980)      REPPT
prog. note               NESC Note 92-18 (October 17, 1991)         NOTPT
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: LMFBR reactors, accidents, concretes, finite difference method, heat transfer, steam, thermal conductivity, water.