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NESC0256 MANTA

MANTA, Heat Transfer Fuel Elements Cluster to Single-Phase Steady-State Fluid Flow

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1. NAME OR DESIGNATION OF PROGRAM:  MANTA
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2. COMPUTERS
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Program name Package id Status Status date
MANTA NESC0256/02 Tested 01-AUG-1967

Machines used:

Package ID Orig. computer Test computer
NESC0256/02 IBM 360 series IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

MANTA is a program which provides a thermal-hydraulic nodal analysis in the steady state. It  was designed to analyze fuel element configuration in the superheat  development program. MANTA analyzes mixing between coolant channels, allows for temperature variant conductivity in admittance calculations, and multiple stacked segments through the fuel region  for a 7-element cluster analysis over a length of up to 8 feet. MANTA is designed for single-pass steam flow. The flow direction in  the coolant channels may be either up or down, thereby permitting the analysis of two-pass as well as single-pass fuel elements. MANTA accounts for the heat transfer and pressure drop that may occur between coolant channels due to mixing as well as to the conventional heat transfer and pressure drop relationships due to friction, discontinuities, acceleration, convection, conduction, and radiation. MANTA allows for the calculation at each node of the material properties viscosity, specific heat, conductivity, and specific volume to correspond to the actual node temperature being solved for. The CDC6600 version uses sodium for the working fluid rather than steam.
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4. METHOD OF SOLUTION

The program embodies two independent analytical solutions. The solution proceeds by solving for the node temperatures of the first segment, evaluating the change in coolant  temperature, and proceeding to calculate the temperatures of the second segment. This process continues until all segment temperatures have been evaluated. A pressure drop check on each coolant channel is then made which requires that all channel pressure drops be within specified input values. If these values are not converged, a new flow rate for each channel is derived and the solution repeated until convergence is achieved.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   200 nodes
     1 to 100 internal nodes
   101 to 150 surface nodes
    48 coolant nodes
    24 coolant channels
    20 segments
6 connections per node except for the coolant nodes which        have 5
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6. TYPICAL RUNNING TIME:  About 3 seconds per node are required on the  GE635.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

MANTA uses the TIGER5 method for thermal-hydraulics calculations.
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9. STATUS
Package ID Status date Status
NESC0256/02 01-AUG-1967 Tested at NEADB
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10. REFERENCES

Description-Steam Property Functions, I1 F001-F029.
             System Routine ENSERT, CDC Note.
             BITA, GESJ Note.
NESC0256/02, included references:
- S. F. Armour  and D. L. Smith
MANTA-Mixing Analyzed Nodal Thermal-hydraulic Analysis,
GEAP-4805, February 1965.
- Nels J. Anderson, Jr.
IDFTAP, A Fortran IV Function Subprogram
S6T001, January 15, 1965
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11. MACHINE REQUIREMENTS:  35K GE635, with 3 scratch tapes.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0256/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  GECOS (GE635) and SCOPE (CDC6600).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

MANTA
requires the use of steam properties which are not supplied, but a subroutine writeup is included. A tape definition subroutine writeup is also included. A CDC6600 system routine ENSERT was used to make the GE635 subroutine BITA operational. Also, on the CDC6600 it is necessary to use a MODE(0) control card, which prevents the error exit from the computer due to the generation of an infinite or indefinite (i. e. X/0). On the GE635, division by zero returns a 0.
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15. NAME AND ESTABLISHMENT OF AUTHORS

   635           M. J. Stedwell, M/C 311
                 Nuclear Energy Division
                 General Electric Company
                 175 Curtner Avenue
                 San Jose, California  95125
   635           B. G. Atraz
                 Advanced Products Operation
                 General Electric Company
                 310 De Guigne Drive
                 Sunnyvale, California  94086
   6600          E. H. Novendstern
                 Advanced Reactors Division
                 Westinghouse Electric Corporation
                 Waltz Mill Site
                 Box 158
                 Madison, Pennsylvania  15663
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16. MATERIAL AVAILABLE
NESC0256/02
File name File description Records
NESC0256_02.001 INFORMATION 3
NESC0256_02.002 SOURCE & DATA IBM 360 6199
NESC0256_02.003 OUTPUT 2254
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: fluid flow, fuel elements, heat transfer, temperature distribution.