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US 4,879,087 AGranted
Nuclear power plant
AssigneeHitachi, Ltd.
InventorsTakao Akiyama, Tetsuo Ito, Isao Sumida
Life of this patent
Estimating the term…
Abstract
Jet pumps and a feed water sparger are disposed in a reactor pressure vessel incorporating a core. A first feed water pipe supplies a portion of feed water to the jet pumps as their driving water. A second feed water pipe connected to the first feed water pipe supplies the remaining portion of the feed water to the feed water sparger. A first feed water heater is disposed in the first feed water pipe downstream of a connecting point of the first feed water pipe and the second feed water pipe. An amount of extracted steam introduced into the first feed water heater is controlled on the basis of a difference in the temperature between feed water flowing through the first feed water pipe and the feed water flowing through the second feed water pipe.
Claims17
A nuclear power plant comprising:
- a reactor container incorporating a core;
- a jet pump disposed in said reactor container and adapted to supply a coolant to said core;
- a feed water sparger provided in said reactor container;
- and
- feed water supplying means for introducing a portion of feed water into said jet pump as driving water and introducing the remaining portion of said feed water into said feed water sparger at a temperature lower than that of said portion of said feed water introduced into said jet pump.
2 more elements
A nuclear power plant comprising:
- a reactor container incorporating a core;
- a jet pump disposed in said reactor container and adapted to supply a coolant to said core;
- a feed water sparger provided in said reactor container;
- a first pipeline for introducing a portion of feed water into said jet pump as driving water;
- a second pipeline for introducing the remaining portion of said feed water into said feed water sparger;
- and
- heating means disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger.
4 more elements
A nuclear power plant comprising:
- a reactor container incorporating a core;
- a jet pump disposed in said reactor container and adapted to supply a coolant to said core;
- a feed water sparger provided in said reactor container;
- a first pipeline for introducing a portion of feed water into said jet pump as driving water;
- a second pipeline connected to said first pipeline and adapted to introduce said feed water into said feed water sparger;
- and
- a feed water heater disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger, said second pipeline being installed in said first pipeline upstream of said feed water heater.
4 more elements
A nuclear power plant comprising:
- a first pipeline for introducing as driving water portion of feed water into a jet pump disposed in a reactor container and adapted to supply a coolant to a core;
- a second pipeline for introducing the remaining portion of said feed water into said feed water sparger;
- heating means disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger;
- a first flow meter for measuring a flow rate of steam discharged from said reactor container;
- a second flow meter for measuring a flow rate of said feed water introduced through said first pipeline;
- a third flow meter for measuring a flow rate of said feed water introduced through said second pipeline;
- a level gauge for measuring the level of said coolant in said reactor container;
- water level controlling means for outputting a control signal so as to maintain a water level in said reactor container at a predetermined level on the basis of said flow rate of steam measured by said first flow meter, each of said flow rates of feed water measured by said second and third flow meters, and said water level measured by said level meter;
- and
- flow-rate adjusting means disposed in said second pipeline and adapted to adjust a flow rate of said feed water flowing through said second pipeline on the basis of said control signal.
7 more elements
A nuclear power plant comprising:
- a first pipeline for introducing as driving water a portion of feed water into a jet pump disposed in a reactor container and adapted to supply a coolant to a core;
- a second pipeline for introducing the remaining portion of said feed water into said feed water sparger;
- heating means disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger;
- reactor power controlling means for outputting a control signal for controlling a reactor power;
- and
- flow rate adjusting means disposed in said first pipeline and adapted to adjust a flow rate of said feed water in said first pipeline on the basis of said control signal.
3 more elements
A nuclear power plant comprising:
- a first pipeline for introducing as driving water a portion of feed water into a jet pump disposed in a reactor container and adapted to supply a coolant to a core;
- a second pipeline for introducing the remaining portion of said feed water into said feed water sparger;
- heating means disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger;
- reactor power controlling means for outputting a first control signal to control a reactor power;
- water level controlling means for outputting a second control signal to maintain the water level in said reactor container at a predetermined level;
- first flow-rate adjusting means provided in said first pipeline and adapted to adjust a flow rate of said feed water in said first pipeline on the basis of said first control signal;
- second flow-rate adjusting means provided in said second pipeline adapted to adjust a flow rate of said feed water in said second pipeline on the basis of said second control signal;
- and
- means for correcting at least one of said first and second control signals when a trip signal is input.
6 more elements
A nuclear power plant comprising:
- a first pipeline for introducing as driving water a portion of feed water into a jet pump disposed in a reactor container and adapted to supply a coolant to a core;
- a second pipeline for introducing the remaining portion of said feed water into said feed water sparger;
- heating means disposed in said first pipeline and adapted to increase the temperature of said feed water introduced into said jet pump to a level higher than that of said feed water introduced into said feed water sparger;
- a first thermometer disposed in said first pipeline;
- a second thermometer disposed in said second pipeline;
- a reactor power detector provided in said core;
- and means
- for determining on the basis of each of said feed water temperatures measured by said first and second thermometers and a reactor power measured by said reactor power detector whether or not an operating status of said reactor has reached an allowable limit, and for correcting said control signal in such a manner that said operating status does not exceed said allowable limit when said operating status has reached said allowable limit.
5 more elements
A nuclear power plant comprising:
- a reactor container incorporating a core;
- a jet pump disposed in said reactor container and adapted to supply a coolant to said core;
- a feed water sparger ]provided in said reactor container;
- a first pipeline for introducing feed water into said jet pump as driving water;
- a second pipeline connected to said first pipeline and adapted to introduce said feed water into said feed water sparger;
- a first feed water heater disposed at a portion of said first pipeline upstream of a connecting point between said first pipeline and said second pipeline;
- a second feed water heater disposed at a portion of said first pipeline downstream of said connecting point;
- a turbine driven by steam discharged from said reactor container;
- a bleeding pipeline provided with a flow-rate adjusting valve and adapted to introduce said steam into said first feed water heater;
- means for detecting a rotational speed of said turbine;
- means for extracting from an output of said rotational speed detecting means a component of variation falling within a predetermined period and predetermined amplitude;
- and
- means for controlling an amount of opening of said flow-rate adjusting valve on the basis of said component of variation extracted.
10 more elements
Dependencies are inferred from the claim text.