US3630839A
Expired / Lapsed
US
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System and method for operating a boiling water reactor-steam turbine plant
Assignee: Westinghouse Electric Corp
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Filing: 1968-11-26
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Granted: 1971-12-28
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Expires: 1988-11-26
Abstract
Abstract A turbine follow control system for a boiling water reactorsteam turbine plant includes an electrical reference system which determines the reactor operating level through a reactor control system. The turbine follow control system operates turbine steam valves and steam bypass valves electrohydraulically to control the stem throttle pressure as the level of reactor operation is controllably varied to produce required steam flow. In another arrangement, a coordinated control system for a boiling water reactor-steam turbine plant includes an electrical reference system which simultaneously determines the reactor operating level and the turbine steam flow subject to throttle pressure control constraints.
Inventors
- 👤 Leaman B Podolsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:52
CPC Classifications
G; G21; G21D; G21D3/00; G21D3/08; F; F01; F01D; F01D17/00; F01D17/20; F01D17/22; F01D17/24; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
A plant control system as set forth in claim 1 wherein said system operates in the turbine follow mode and a throttle pressure control system includes the first-mentioned inlet valve control system operating means and primarily determines the operation of said inlet valve control system.
Claim 2
Dependent Claim
24 words
A plant control system as set forth in claim 2 wherein said electrohydraulic control systems include electrical control circuitry formed principally from analog circuits.
Claim 3
Dependent Claim
83 words
A plant control system as set forth in claim 1 wherein said system operates in a coordination control mode, and a throttle pressure control system includes the first-mentioned inlet valve control system operating means to produce throttle pressure constraint on the operation of said inlet valve control system, and means responsive to the load reference representation is provided for directly controlling the operation of said inlet valve control system to produce load corrective positioning of the turbine inlet valves within throttle pressure constraints.
Claim 4
Independent Claim
150 words
A system for controlling the operation of a nuclear boiling water reactor-steam turbine plant, said system comprising means for generating an electrical representation of a load demand reference, means responsive to the load reference representation for controlling the operation of the reactor to meet load demand, an electrohydraulic control system for operating steam inlet valves associated with the turbine, an electrohydraulic control system for operating steam bypass valves to divert steam from the turbine to a condenser under predetermined throttle pressure conditions, means for generating an electrical representation of the throttle pressure of steam supplied to the turbine by the reactor, and means responsive to the load reference and throttle pressure electrical representations for controlling the operation of said inlet valve control system to adjust the turbine load toward plant demand within throttle pressure constraints and without positive feedback effect on impulse pressure as the reactor power level undergoes correction.
Claim 5
Dependent Claim
76 words
A plant control system as set forth in claim 5 wherein means are provided for generating an electrical representation of the ratio of the turbine impulse pressure to the throttle pressure, said controlling means for said inlet valve control system provides inlet valve operating control at least in response to the pressure ratio and load reference and throttle pressure electrical representations, and said controlling means for said inlet valve control system includes said ratio generating means.
Claim 6
Dependent Claim
47 words
A plant control system as set forth in claim 6 wherein means are provided for generating a representation of throttle pressure error in response to the throttle pressure electrical repResentation, and said controlling means for said inlet valve control system includes said throttle pressure error generating means.
Claim 7
Dependent Claim
48 words
A plant control system as set forth in claim 6 wherein said ratio generating means generates an electrical representation as a predetermined function of the ratio of the turbine impulse pressure to the throttle pressure, and the pressure ratio representation is substantially constant for constant turbine impulse pressure.
Claim 8
Dependent Claim
99 words
A plant control system as set forth in claim 8 wherein said controlling means for said inlet valve control system includes at least one analog pressure controller responsive to a throttle pressure setpoint and an actual throttle pressure signal to generate a throttle pressure error signal, said electrohydraulic inlet valve control system includes electrical circuitry formed principally from analog circuits, and means responsive at least to the throttle pressure error signal and the load demand electrical reference representation and the pressure ratio representation are provided to generate a valve position demand signal for said electrohydraulic inlet valve control system.
Claim 9
Dependent Claim
42 words
A plant control system as set forth in claim 5 wherein said reactor-controlling means includes means responsive to the load reference representation and an electrical representation of actual load to generate a load error representation upon which reactor control actions are based.
Claim 10
Independent Claim
158 words
A method for controlling the operation of a nuclear boiling water reactor-steam turbine plant, the steps of said method comprising generating an electrical representation of a load demand reference, controlling the operation of the reactor to meet the load demand in accordance with the load reference representation, generating an electrical representation of the throttle pressure of steam supplied to the turbine by the reactor, controlling the operation of turbine steam inlet valves by means of an electrohydraulic control system, controlling the operation of steam bypass valves to divert steam from the turbine to a condenser under predetermined throttle pressure conditions by means of an electrohydraulic control system, and controlling the operation of the inlet valve electrohydraulic control system in response to the load reference representation and the throttle pressure electrical representation to adjust the turbine load toward plant demand within throttle pressure constraints and without positive feedback effect on impulse pressure as the reactor power level undergoes correction.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |