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NESC1102 ORTURB.

ORTURB, HTGR Steam Turbine Dynamic for FSV Reactor

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1. NAME OR DESIGNATION OF PROGRAM:  ORTURB.
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2. COMPUTERS
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Program name Package id Status Status date
ORTURB NESC1102/01 Arrived 02-MAY-2001

Machines used:

Package ID Orig. computer Test computer
NESC1102/01 IBM 360/91
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3. DESCRIPTION OF PROGRAM OR FUNCTION

ORTURB was written specifically to calculate the dynamic behavior of the Fort St. Vrain (FSV) High-  Temperature GAS-Cooled Reactor (HTGR) steam turbines. The program is divided into three main parts: the driver subroutine; turbine subroutines to calculate the pressure-flow balance of the high-, intermediate-, and low-pressure turbines; and feedwater heater subroutines.
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4. METHOD OF SOLUTION

The program uses a relationship derived for ideal gas flow in an iterative fashion that minimizes computational  time to determine the pressure and flow in the FSV steam turbines as a function of plant transient operating conditions. An important computer modeling characteristic, unique to FSV, is that the high-pressure turbine exhaust steam is used to drive the reactor core coolant circulators prior to entering the reheater. A feedwater heater dynamic simulation model utilizing seven state variables for  each of the five heaters is included in the ORTURB computer simulation of the regenerative Rankine cycle steam turbines. The seven temperature differential equations are solved at each time- step using a matrix exponential method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The turbine shaft is assumed to rotate at a constant (rated) speed of 3600 rpm. Energy and mass storage of steam in the high-, intermediate-, and low-pressure turbines is assumed to be negligible. These limitations exclude the use of ORTURB during a turbine transient such as startup from zero power or very low turbine flows.
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6. TYPICAL RUNNING TIME

The ORTURB turbine model uses approximately 0.05 seconds of IBM360/91 CPU time for each computational time-step. This value is subject to the transient being modeled and will increase as severity of the transient increases.
Sample problem execution requires 10 CPU seconds on an IBM3033 and 8 CPU minutes on an IBM4331.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

ORTURB was designed to be used in the overall Fort St. Vrain plant simulator code ORTAP; certain parameters must be supplied if it is run independently. ORTURB uses  steam property subroutines originally written for ORCENT (NESC 703).
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9. STATUS
Package ID Status date Status
NESC1102/01 02-MAY-2001 Masterfiled Arrived
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10. REFERENCES

- J.C. Cleveland, R.A. Hedrick, S.J. Ball, and J.G. Delene
  ORTAP: A Nuclear Steam Supply System Simulation for the Dynamic
  Analysis of High-Temperature Gas Cooled Reactor Transients,
  ORNL/NUREG/TM-78, September 1977.
NESC1102/01, included references:
- J.C. Conklin:
  ORTURB - A Digital Computer Code to Determine the Dynamic Response
  of the Fort St. Vrain Reactor Steam Turbines
  NUREG/CR-1789 (ORNL/NUREG/TM-399) (March 5, 1981).
- M. Birgersson:
  ORTURB Tape Description
  NESC Note 89-39 (February 27, 1989).
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11. MACHINE REQUIREMENTS:
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC1102/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  OS/360 (IBM360),  MVS (IBM3033), VM/CMS (IBM4331).
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

  Time-
dependent parameters which must be supplied to execute ORTURB independently are the desired turbine loading, high-pressure turbine inlet steam pressure and enthalpy, intermediate turbine inlet pressure and enthalpy, and feedwater flow through each feedheater and into the steam generator.
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15. NAME AND ESTABLISHMENT OF AUTHORS

          J.C. Conklin
          Engineering Technology Division
          Oak Ridge National Laboratory
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16. MATERIAL AVAILABLE
NESC1102/01
source program   mag tapeORTURB Source Program (FTN)                SRCTP
test-case data   mag tapeORTURB Sample Problem Input                DATTP
test-case output mag tapeORTURB Sample Problem Output               OUTTP
report                   NUREG/CR-1789 (March 5, 1981)              REPPT
prog. note               NESC Note 89-39 (February 27, 1989)        NOTPT
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17. CATEGORIES
  • H. Heat Transfer and Fluid Flow

Keywords: reactor cooling systems, steam turbines, turbines.