NESC1102 ORTURB.
ORTURB, HTGR Steam Turbine Dynamic for FSV Reactor
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 |
|---|---|---|---|
| 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.
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.
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.
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.
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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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.
- 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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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.
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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NESC1102/01
source program mag tapeORTURB Source Program (FTN) SRCTPtest-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
Keywords: reactor cooling systems, steam turbines, turbines.