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ESTS0143 MINET.

MINET, Transient Fluid Flow and Heat Transfer Power Plant Network Analysis

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1. NAME OR DESIGNATION OF PROGRAM:  MINET.
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2. COMPUTERS
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Program name Package id Status Status date
MINET ESTS0143/01 Arrived 07-MAY-2002

Machines used:

Package ID Orig. computer Test computer
ESTS0143/01 IBM 3090
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3. DESCRIPTION OF PROGRAM OR FUNCTION

MINET (Momentum Integral NETwork) was developed for the transient analysis of intricate fluid flow and heat transfer networks, such as those found in the balance  of plant in power generating facilities. It can be utilized as a stand-alone program or interfaced to another computer program for concurrent analysis. Through such coupling, a computer code limited  by either the lack of required component models or large computational needs can be extended to more fully represent the thermal hydraulic system thereby reducing the need for estimating essential transient boundary conditions. The MINET representation of a system is one or more networks of volumes, segments, and boundaries linked together via heat exchangers only, i.e., heat can  transfer between networks, but fluids cannot. Volumes are used to represent tanks or other volume components, as well as locations in  the system where significant flow divisions or combinations occur. Segments are composed of one or more pipes, pumps, heat exchangers,  turbines, and/or valves each represented by one or more nodes. Boundaries are simply points where the network interfaces with the user or another computer code. Several fluids can be simulated, including water, sodium, NaK, and air.
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4. METHOD OF SOLUTION

MINET is based on a momentum integral network method. Calculations are performed at two levels, the network level  (volumes) and the segment level. Equations conserving mass and energy are used to calculate pressure and enthalpy within volumes. An integral momemtum equation is used to calculate the segment average flow rate. In-segment distributions of mass flow rate and enthalpy are calculated using local equations of mass and energy. The segment pressure is taken to be the linear average of the pressure at both ends. This method uses a two-plus equation representation of the thermal hydraulic behavior of a system of heat exchangers, pumps, pipes, valves, tanks, etc. With the exception of  variables which are control system related, such as pump speed, the  system represented is closed and accessed only through boundary modules. MINET uses a homogeneous equilibrium model of two-phase flow, supplemented by various two-phase correlations.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   5 heat exchanger options
   3 heat exchanger tube configuration options
   2 turbine stage types
At least one inlet and one outlet boundary must be included in each fluid network. The MINET methodology is geared toward solving one-dimensional flow network problems (e.g., balance of plant) under non-blowdown transient conditions. Pressure waves are not tracked locally. It is implicity assumed that the propagation of pressure waves in pipes, pumps, heat exchangers, and valves takes place on a  time scale much smaller (milliseconds) than the transient of interest (seconds).
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6. TYPICAL RUNNING TIME

Running time varies depending on the detail specified and the transient simulated. NESC executed the sample problem in 17 CPU minutes on an IBM4331 and in 5 CPU seconds on a Cray Y-MP.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

MINET is coupled and interfaced to  SSC-L to represent the steam generation system.
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9. STATUS
Package ID Status date Status
ESTS0143/01 07-MAY-2002 Masterfiled Arrived
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10. REFERENCES

- MINET, NESC No. 1114.3090, MINET IBM3090 Version Tape Description,   NESC Note 89-99 (September 29, 1989).
- Gregory J. Van Tuyle:
  A Momentum Integral Network Method for Thermal-Hydraulic Systems
  Analysis
  Nuclear Engineering and Design, Vol. 91, pp. 17-28 (1986).
ESTS0143/01, included references:
- G.J. Van Tuyle, T.C. Nepsee and J.G. Guppy:
  MINET Code Documentation
  NUREG/CR-3668, BNL-NUREG-51742 (Dec. 1989)
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11. MACHINE REQUIREMENTS

MINET requires 1349 Kbytes of memory on an IBM4331 and 152 Kbytes of memory on a Cray Y-MP.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
ESTS0143/01 FORTRAN+BAL
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  UNICOS 4.0 (Cray), VM/CMS (IBM).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

The IBM version of MINET includes Basic Assembler Language subroutines ICLOCK, IDAY, and TIME to return elapsed CPU time, current date, and time, respectively. The Cray version of MINET does not execute using the CFT77 compiler; the CFT compiler is required.
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15. NAME AND ESTABLISHMENT OF AUTHORS

          G.J. Van Tuyle
          Department of Nuclear Energy
          Brookhaven National Laboratory
          Upton, NY (United States)
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16. MATERIAL AVAILABLE
ESTS0143/01
source program   mag tapeMINET Source code                          SRCTP
object program   mag tapeICLOCK Assembler routine                   OBJTP
object program   mag tapeIDAY Assembler routine                     OBJTP
object program   mag tapeTIME Assembler routine                     OBJTP
test-case data   mag tapeSample problem                             DATTP
test-case data   mag tapeControl file                               DATTP
test-case output mag tapeSample problem output                      OUTTP
test-case data   mag tapeEnd of Transmittal                         DATTP
report                   NUREG/CR-3668, BNL-NUREG-51742 (Dec. 1989) REPPT
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: fluid flow, heat exchangers, heat transfer, pipes, pumps, systems analysis, two-phase flow.