US3930937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam relief valve control system for a nuclear reactor
Assignee: Combustion Engineering Inc
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Filing: 1973-04-02
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Granted: 1976-01-06
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Expires: 1993-04-02
Abstract
Abstract A turbine follow system and method for Pressurized Water Reactors utilizing load bypass and/or atmospheric dump valves to provide a substitute load upon load rejection by bypassing excess steam to a condenser and/or to the atmosphere. The system generates a variable pressure setpoint as a function of load and applies an error signal to modulate the load bypass valves. The same signal which operates the bypass valves actuates a control rod automatic withdrawal prevent to insure against reactor overpower.
Inventors
- 👤 Jose Marcelo Torres
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:36
CPC Classifications
G; G21; G21D; G21D3/00; G21D3/08; G21C; G21C9/00; G21C9/004; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A control rod interlock system for a nuclear power plant having a nuclear reactor with a core and control rods for controling the power output thereof, and having a working fluid circuit for providing the working fluid to a load, and having steam relief valves for diverting the working fluid around the load, the interlock system comprising: a. means responsive to said working fluid for detecting a condition of said working fluid; b. means responsive to said detecting means for generating a signal indicative of a steam relief valve demand; and c. means responsive to said signal indicative of steam relief valve demand for preventing the movement of said control rods out of said core of said reactor.
Claim 2
Dependent Claim
118 words
A control rod interlock system for a nuclear power plant having a nuclear reactor with a core and control rods for controling the power output thereof, and having a working fluid circuit for providing the working fluid to a load, and having steam relief valves for diverting the working fluid around the load, the interlock system comprising: a. means responsive to said working fluid for detecting a condition of said working fluid; b. means responsive to said detecting means for generating a signal indicative of a steam relief valve demand; and c. means responsive to said signal indicative of steam relief valve demand for preventing the movement of said control rods out of said core of said reactor.
Claim 3
Dependent Claim
230 words
A control rod interlock system for a nuclear power plant having a nuclear reactor with a core and control rods for controlling the power output thereof, and having a primary fluid circuit for circulating a coolant through the reactor core, a secondary fluid circuit in heat exchange relation with the primary fluid circuit to provide secondary fluid to a load, and steam relief valves for allowing the secondary fluid to passed around the load, the interlock system comprising: a. means responsive to the fluid pressure of said secondary circuit for generating a signal for actuating said steam relief valves; b. means responsive to the fluid flow of the secondary circuit for generating a signal for actuating said steam relief valves; c. means responsive to the signals of said means responsive to the fluid pressure of said secondary circuit for generating a signal for actuating said steam relief valves or to the signals of said means responsive to the fluid flow of the secondary circuit for generating a signal for actuating said steam relief valves for generating a digital signal indicative of the existance of any single steam relief valve demand signal; and d. means responsive to said means for generating a digital signal indicative of the existance of any single steam relief valve demand signal for preventing the movement of said control rods out of the core of said reactor.
Claim 4
Dependent Claim
230 words
A control rod interlock system for a nuclear power plant having a nuclear reactor with a core and control rods for controlling the power output thereof, and having a primary fluid circuit for circulating a coolant through the reactor core, a secondary fluid circuit in heat exchange relation with the primary fluid circuit to provide secondary fluid to a load, and steam relief valves for allowing the secondary fluid to passed around the load, the interlock system comprising: a. means responsive to the fluid pressure of said secondary circuit for generating a signal for actuating said steam relief valves; b. means responsive to the fluid flow of the secondary circuit for generating a signal for actuating said steam relief valves; c. means responsive to the signals of said means responsive to the fluid pressure of said secondary circuit for generating a signal for actuating said steam relief valves or to the signals of said means responsive to the fluid flow of the secondary circuit for generating a signal for actuating said steam relief valves for generating a digital signal indicative of the existance of any single steam relief valve demand signal; and d. means responsive to said means for generating a digital signal indicative of the existance of any single steam relief valve demand signal for preventing the movement of said control rods out of the core of said reactor.
Claim 5
Dependent Claim
66 words
A control rod interlock system as recited in claim 2 wherein said means responsive to said means responsive to the fluid pressure of said secondary circuit for generating a signal for actuating said steam relief valves or to the signals of said means responsive to the fluid flow of the secondary circuit for generating a signal for actuating said steam relief valves is an "OR" gate.
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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |