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NESC0703 ORCENT-2.

ORCENT-2, Full Load Steam Turbine Cycle Thermodynamics for LWR Power Plant

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1. NAME OR DESIGNATION OF PROGRAM:  ORCENT-2.
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2. COMPUTERS
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Program name Package id Status Status date
ORCENT-2 NESC0703/01 Tested 12-FEB-1981

Machines used:

Package ID Orig. computer Test computer
NESC0703/01 IBM 3033 IBM 3033
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3. DESCRIPTION OF PROBLEM OR FUNCTION

ORCENT-2 performs heat and mass balance calculations at valves-wide-open design conditions, maximum  garanteed rating conditions, and an approximation of part-load conditions for steam turbine cycles supplied with throttle steam, characteristic of contemporary light-water reactors. The program handles both condensing and back-pressure turbine exhaust arrangements. Turbine performance calculations are based on the General Electric Company method for 1800-rpm large steam turbine- generators operating with light-water-cooled nuclear reactors. Output includes all information normally shown on a turbine-cycle heat balance diagram.
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4. METHOD OF SOLUTION

The turbine performance calculations follow the procedures outlined in General Electric report GET-6020. ORCENT-2 utilizes the 1967 American Society of Mechanical Engineers (ASME) formulations and procedures for calculating the properties of steam, adapted for ORNL use by D.W. Altom.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   12 feed-water heaters
    5 moisture removal stages in the low-pressure turbine section.
ORCENT-2 is limited to 1800-rpm tandem-compound turbine-generators with single- or double-flow high pressure sections and one, two, or  three double-flow low-pressure turbine sections. Steam supply for LWR cycles should be between 900 and 1100 psia and slightly wet to 100 degrees F of initial superheat. Generator rating should be greater than 100 MVA.
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6. TYPICAL RUNNING TIME

Execution time for one valves-wide-open case followed by one maximum guaranteed case is approximately 5 seconds on the IBM 360/91. NESC compiled and executed the sample problems in less than 30 CPU seconds on an IBM 3033.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

The original ORCENT program, prepared by H.I. Bowers of Oak Ridge National Laboratory, for analyzing turbine cycles with large steam turbine-generators operating with saturated or low-superheat throttle steam, utilizes steam properties based on the equations of Keenan and Keyes and turbine performance calculations following the General Electric procedures described in GER-2454A.
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9. STATUS
Package ID Status date Status
NESC0703/01 12-FEB-1981 Tested at NEADB
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10. REFERENCES

- L.C. Fuller:
  User's Instructions for ORCENT II - A Digital Computer Program
  for the Analysis of Steam Turbine Cycles Supplied by Light-Water-
  Cooled Reactors
  ORNL/TM-6525, February l979.
- F.G. Baily, J.A. Booth, K.C. Cotton, and E.H. Miller:
  Predicting the Performance of 1800-rpm Large Steam Turbine
  Generators Operating with Light-Water-Cooled Reactors
  General Electric Company report, GET-6020, February l973.
- R.B. McClintock and G.J. Silvestri:
  Formulations and Iterative Procedures for the Calculation of
  Properties of Steam
  American Society of Mechanical Engineers, New York, 1967.
- ORCENT2, NESC No. 703, ORCENT2 Sample Problem Output
  NESC Note 80-08, December 5, 1979.
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11. MACHINE REQUIREMENTS

210K bytes of storage were needed for execution of the sample problems on an IBM 3033.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0703/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/360,370.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

L.C. Fuller
Oak Ridge National Laboratory
P. O. Box X
Oak Ridge, Tennessee 37830, U. S. A.
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16. MATERIAL AVAILABLE
NESC0703/01
File name File description Records
NESC0703_01.001 INFORMATION 36
NESC0703_01.003 SOURCE (EBCDIC) 6531
NESC0703_01.004 S.P. INPUT DATA 49
NESC0703_01.005 S.P. OUTPUT 1008
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: BWR reactors, LWR reactors, heat, mass balance, power plants, pwr reactors, steam generators, steam turbines.