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NESC0433 CONTEMPT-LT/028

CONTEMPT, LWR Containment Pressure and Temperature Distribution in LOCA

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1. NAME OR DESIGNATION OF PROGRAM:  CONTEMPT-LT/028, CONTEMPT-LT/026.
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2. COMPUTERS
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Program name Package id Status Status date
CONTEMPT-LT28B NESC0433/07 Tested 28-JUL-1988
CONTEMPT-LT/28-H NESC0433/08 Tested 28-OCT-1991

Machines used:

Package ID Orig. computer Test computer
NESC0433/07 CDC 7600 CDC 7600
NESC0433/08 IBM 3090 DEC VAX 8810
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3. DESCRIPTION OF PROBLEM OR FUNCTION

CONTEMPT-LT was developed to predict the long-term behavior of water-cooled nuclear reactor containment systems subjected to postulated loss-of-coolant accident (LOCA) conditions. CONTEMPT-LT calculates the time variation of compartment pressures, temperatures, mass and energy inventories, heat structure temperature distributions, and energy exchange with adjacent compartments. The program is capable of describing the effects of leakage on containment response. Models are provided for  fan cooler and cooling spray engineered safety systems. One to four  compartments can be modeled, and any compartment except the reactor  system may have both a liquid pool region and an air-vapor atmosphere region above the pool. Each region is assumed to have a uniform temperature, but the temperatures of the two regions may be  different. The user determines the compartments to be used, specifies input mass and energy additions, defines heat structure and leakage systems, and prescribes the time advancement and output  control. CONTEMPT-LT/28-H (NESC0433/08) includes also models for hydrogen combustion.
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4. METHOD OF SOLUTION

The initial conditions of the containment atmosphere are calculated from input values, and the initial temperature distributions through the containment structures are determined from the steady-state solution of the heat conduction equations. A time advancement proceeds as follows. The input water and energy rates are evaluated at the midpoint of a time interval and added to the containment system. Pressure suppression, spray system effects, and fan cooler effects are calculated using conditions at the beginning of a time-step. Leakage and heat losses  or gains, extrapolated from the last time-step, are added to the containment system. Containment volume pressure and temperature are  estimated by solving the mass, volume, and energy balance equations. Using these results as boundary conditions, the heat conduction equations describing structure behavior are advanced using an implicit technique. The resulting heat transfer rates are used to correct the previous estimates of the water and energy storage in the containment volume, and the containment conditions are obtained  by solving for the second time the containment balance equations. The pressure suppression routines use the conditions at the beginning of a time-step to calculate both the initial explusion of  water from the vents and the flow through the vents. From the calculated flow rates, mass and energy are removed from the dry well and added to the wet well.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
     20 heat conducting structures
    101 mesh points for each structure
     20 regions for each structure
50 flow elements in one segment of the horizontal vent         pressure suppression system
     10 horizontal vents (or branches) in a segment
     50 reductions within an input time-step
CONTEMPT-LT can be used for analyzing the transient containment behavior of boiling-water reactors (BWRs) including Mark I, Mark II, and Mark III systems; pressurized-water reactors (PWRs), and experimental water reactor simulators or related experiments.
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6. TYPICAL RUNNING TIME

On the CDC 7600, CONTEMPT-LT/028 requires less than 30 seconds to run the two sample problems. On the IBM 360/ 75, CONTEMPT-LT/026 requires approximately 0.021 second per time advancement with 90 mesh points for heat structures without pressure suppression. The pressure suppression timing is not easily predicted but run time for two sample problems ranges from 0.3 to 2 seconds per time advancement.
CONTEMPT/LT28B (NESC0433/06): NEA-DB executed the test case on CDC 7600 in 70 seconds.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

CONTEMPT-LT/028 is the most recent  of a series of computer programs developed to describe the thermal-  hydraulic conditions attendant to Various postulated transients in the containment of light-water reactor systems. CONTEMPT-LT/026 replaced CONTEMPT (NESC Abstract 297), CONTEMPT-CONPS, CONTEMPT-PS,  CONTEMPT-LT/022, and CONTEMPT-LT/025 (which contained known errors and was never distributed by NESC).
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9. STATUS
Package ID Status date Status
NESC0433/07 28-JUL-1988 Screened
NESC0433/08 28-OCT-1991 Screened
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10. REFERENCES

- L.L. Wheat, R.J. Wagner, G.F. Niederauer, and C.F. Obenchain,
  CONTEMPT-LT - A Computer Program for Predicting Containment
  Pressure-Temperature Response to a Loss-of-Coolant Accident,
  ANCR-1219, June 1975.
- K.D. Richert,
  BUFIO, A Subroutine to Permit FORTRAN Access to IOOP,
  Phillips Petroleum Note, February 1966.
- A.J. Smith,
  Standard Package Description, Calcomp Plotter Subroutines
  (S0010.0),
  Appendix D, January 1971.
- W.H. Rettig, R.C. Young, and N.H. Marshall,
  UPD - A Program to Update Source Decks,
  P01751, and Addendum.
- R.J. Wagner,
  STH20, A Subroutine Package to Compute the Thermodynamic
  Properties of Water,
  ANCR Note, 1975.
  NRTS Environmental Subroutine Manual,
  ANC Document, December 1972.
- W.J. Mings,
  Fan Cooler Containment Model in CONTEMPT-LT/025,
  SRD-25-76, November 1975.
- W.J. Mings,
  Version 26 Modifications to the CONTEMPT-LT Program,
  SRD-83-76, April 1976.
NESC0433/07, included references:
-  NESC Note 81-30 (December 18, 1980)
-  Don W. Hargroves et al.:
    CONTEMPT-LT/028 - A Computer Program for Predicting Containment
    Pressure-Temperature Response to a Loss-of-Coolant Accident.
    NUREG/CR-0255 TREE-1279 R4 (March 1979).
NESC0433/08, included references:
- Don W. Hargroves et al.:
  CONTEMPT-LT/028 - A Computer Program for Predicting Containment
  Pressure-Temperature Response to a Loss-of-Coolant Accident
  NUREG/CR-0255 TREE-1279 R4 (March 1979).
- NESC Note 81-30 (December 18, 1980)
- D. Colombo:
  Modifications to the Code CONTEMPT-LT/28 and Implementation of
  Models for Hydrogen Combustion
  MTC/FL53/86 (April 1986) Preliminary copy (in Italian).
- D. Colombo:
  Conversion of the Code CONTEMPT-LT/28 from CDC System to IBM
  System
  MTC/SW40/84 (June 1984), (in Italian).
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11. MACHINE REQUIREMENTS

CONTEMPT-LT26: 430 kbytes and a CALCOMP or SC4060 plotter for graphical output.
CONTEMPT/LT28B (NESC0433/06): To execute the sample case on CDC 7600 storage requirements are: 160,000 octal words (SCM)
                          100,000 octal words (LCM).
plotter (CONTEMPT-LT/029); 430K bytes and a Calcomp or SC4060 plotter for graphical output (CONTEMPT-LT/026).
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0433/07 FORTRAN-IV
NESC0433/08 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  SCOPE 2.1 (CDC 7600), OS/360 MVT (IBM360), MVS/XA (IBM).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The
thermodynamic properties of water and steam required by the program  are generated by the STH20 program and made available as a library data set.
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15. NAME AND ESTABLISHMENT OF AUTHOR

Contributed by:
CDC 7600           D.W. Hargroves, L.J. Metcalfe,
                   and Teh-Chin Cheng*
                   EG&G Idaho, Inc.
                   P.O. Box 1625
                   Idaho Falls, Idaho 83415

IBM 360            L.L. Wheat and W.J. Mings
                   Idaho National Engineering Laboratory
                   EG&G Idaho, Inc.
                   P.O. Box 1625
                   Idaho Falls, Idaho 83415

CONTEMPT-LT/28H    E.N.E.L.
                   Thermal and Nuclear Research Center
                   PISA (Italy)
* Contact
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16. MATERIAL AVAILABLE
NESC0433/07
File name File description Records
NESC0433_07.001 CONTEMPT-LT28B INFORMATION FILE 66
NESC0433_07.002 CONTEMPT-LT28B SOURCE CARD-IMAGES (FORTRAN4) 10613
NESC0433_07.003 E&G ENVIRONMENTAL ROUTINES (SCOPE1) 26658
NESC0433_07.004 E&G ENVIRONMENTAL ROUTINES (SCOPE2) 26677
NESC0433_07.005 CONTEMPT-LT28B SOURCE UPDATE FORMAT 10642
NESC0433_07.006 CDC SEGLOAD CARDS 27
NESC0433_07.007 LIBRARY CONVERSION PROGRAM SOURCE (FORTRAN4) 13
NESC0433_07.008 WATER PROPERTIES LIBRARY (BCD) 2544
NESC0433_07.009 CONTEMPT-LT28B INPUT DATA FOR TEST CASES 84
NESC0433_07.010 CONTEMPT-LT28B OUTPUT OF TEST CASES 5436
NESC0433/08
File name File description Records
NESC0433_08.001 Information file 55
NESC0433_08.002 CONTEMPT-LT/28-H FORTRAN source 15788
NESC0433_08.003 CONTEMPT-LT/28-H ASSEMBLER source 1209
NESC0433_08.004 Steam tables (binary for IBM) 0
NESC0433_08.005 JCL to create load module 26
NESC0433_08.006 JCL to run sample problem(s) 10
NESC0433_08.007 Test case 1 input data 54
NESC0433_08.008 Test case 2 input data 36
NESC0433_08.009 Test case 3 input data 58
NESC0433_08.010 Test case 4 input data 41
NESC0433_08.011 Test case 1 printed output 2739
NESC0433_08.012 Test case 2 printed output 2477
NESC0433_08.013 Test case 3 printed output 1905
NESC0433_08.014 Test case 4 printed output 3058
NESC0433_08.015 Implementation notes by ENEL-CRTN 27
NESC0433_08.016 ASCII/EBCDIC steam tables 2545
NESC0433_08.017 Steam table conversion program (FORTRAN) 10
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17. CATEGORIES
  • G. Radiological Safety, Hazard and Accident Analysis

Keywords: accidents, containment, heat transfer, pressure, temperature distribution, thermodynamics, water.