NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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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 |
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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.

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.

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).

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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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).

- 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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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.

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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ESTS0143/01

source program mag tapeMINET Source code SRCTPobject 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

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