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Why bwr has fuel assemblies and coolant flow in channels unlike pwrs where coolant is not guided in channels and enters reactor pressure vessel in pool form?
In the BWR each fuel assembly is encased in a thin walled tube, which is presumably what you are referring to. It is not a fixed part of the reactor structure. This is introduced because in the BWR steam is produced in the coolant, unlike in the PWR which is at a higher pressure to suppress boiling. The voids produced by the steam bubbles introduce a type of reactor response which does not occur in PWR's, namely that if power in a fuel assembly increases, more voids are created which has a negative effect on the reactor's criticality and so this has a self stabilising characteristic, which is beneficial. However it is found to give more reactor stability if each fuel assembly is separated from its neighbours.
What else can I help you with?
What is the function of the pressure vessel of a nuclear reactor?
The pressure vessel of a nuclear reactor contains the reactor core and helps to maintain a high pressure environment to prevent coolant water from boiling. It also serves as a barrier to contain radioactive materials and provide structural support for the reactor.
What is a part of a nuclear power plant that undergoes a fission reaction?
Nuclear fission takes place in the nuclear fuel rods that are placed in the reactor core that is situated in the reactor pressure vessel. The reactor pressure vessel is usually situated inside the reactor containment.
How much coolant is used in a nuclear power reactor?
The amount of coolant used in a nuclear power reactor can vary depending on the design of the reactor. Generally, a nuclear power reactor may use thousands to millions of gallons of water or a different coolant material to remove heat generated during the nuclear fission process. The coolant circulates through the reactor core to transfer heat and help regulate the temperature of the reactor.
What are the necessary components for a nuclear reactor?
for pressurized light water reactor type, as an example, the nuclear reactor components are * Reactor vessel (that contains the nuclear fuel and surrounded with water and contains control rod for power control and for safety) * reactor coolant pump * steam generator * reactor pressurizer * piping out of the vessel to the pressurizer, from pressurizer to steam generator, from steam generator to reactor coolant pump, and from pump back to the reactor vessel.
What does the steam turbines do in a nuclear reactor?
Primarily, the steam turbines spin the generators, which make electricity. That is the primary objective of a nuclear power plant, to make electricity. There are other steam turbines in a nuclear power plant which are used for various functions, such as High Pressure Coolant Injection and Low Pressure Coolant Injection, which are used during various shutdown and emergency scenarios.
What are the functions of pressure vessel and turbine in a nuclear reactor?
The pressure vessel contains the reactor core with its fuel, coolant, moderator, control elements, and emergency systems. The turbine is the device that on receiving the steam it spins and turns the electric generators to produce electricity.
What is the function of the pressure vessel of a nuclear reactor?
The pressure vessel of a nuclear reactor contains the reactor core and helps to maintain a high pressure environment to prevent coolant water from boiling. It also serves as a barrier to contain radioactive materials and provide structural support for the reactor.
What are the basic parts of nuclear reactor?
For the PWR, the reactor core which is an array of fuel assemblies, inside a very strong pressure vessel made of thick steel. The top of the vessel is removable for fuelling, and also holds the control rods and their mechanisms. The whole thing is enclosed in a secondary containment. Also inside this is the primary circuit which circulates water through the core to carry away the heat produced by the fuel assemblies, and the secondary circuit steam raising units which send steam to the turbine. See link below
How many fuel assemblies are in a modern reactor?
200
What is a Pressurised water reactor?
A reactor using light water as moderator and coolant. The primary circuit including the reactor inside its pressure vessel is kept at a high enough pressure to suppress boiling, and the reactor coolant water is circulated through external steam raising units, where heat is transferred to secondary water at a lower pressure so that steam is produced, which then feeds a conventional steam turbine/generator. The uranium fuel is enriched in U-235 to 4-5 percent, and is in the form of uranium dioxide, made up into fuel rods 10mm in diameter and encased in zircaloy sheaths. A number of rods is made into an assembly which is the unit loaded and unloaded during refuelling outages. About 1/3 of the assemblies are changed in each fuelling outage, when the head of the pressure vessel is removed for access. You can read more and see a diagram in the link given below
What is pressurised water reactor?
A reactor using light water as moderator and coolant. The primary circuit including the reactor inside its pressure vessel is kept at a high enough pressure to suppress boiling, and the reactor coolant water is circulated through external steam raising units, where heat is transferred to secondary water at a lower pressure so that steam is produced, which then feeds a conventional steam turbine/generator. The uranium fuel is enriched in U-235 to 4-5 percent, and is in the form of uranium dioxide, made up into fuel rods 10mm in diameter and encased in zircaloy sheaths. A number of rods is made into an assembly which is the unit loaded and unloaded during refuelling outages. About 1/3 of the assemblies are changed in each fuelling outage, when the head of the pressure vessel is removed for access. You can read more and see a diagram in the link given below
How many fuel assemblies in nuclear plant?
The number of fuel assemblies in a nuclear power plant varies depending on the reactor design and size. Typically, a pressurized water reactor (PWR) may contain around 150 to 200 fuel assemblies, while a boiling water reactor (BWR) might have about 400 to 800 fuel assemblies. Each assembly contains numerous fuel rods filled with nuclear fuel, such as uranium or mixed oxide. Ultimately, the specific count is determined by the reactor's design and operational requirements.
How does a nuclear reactor eliminate heat?
Heat is eliminated through use of reactor coolant passing over the nuclear fuel in the primary coolant loops.
What is a part of a nuclear power plant that undergoes a fission reaction?
Nuclear fission takes place in the nuclear fuel rods that are placed in the reactor core that is situated in the reactor pressure vessel. The reactor pressure vessel is usually situated inside the reactor containment.
How much coolant is used in a nuclear power reactor?
The amount of coolant used in a nuclear power reactor can vary depending on the design of the reactor. Generally, a nuclear power reactor may use thousands to millions of gallons of water or a different coolant material to remove heat generated during the nuclear fission process. The coolant circulates through the reactor core to transfer heat and help regulate the temperature of the reactor.
What are the necessary components for a nuclear reactor?
for pressurized light water reactor type, as an example, the nuclear reactor components are * Reactor vessel (that contains the nuclear fuel and surrounded with water and contains control rod for power control and for safety) * reactor coolant pump * steam generator * reactor pressurizer * piping out of the vessel to the pressurizer, from pressurizer to steam generator, from steam generator to reactor coolant pump, and from pump back to the reactor vessel.
What are the six main parts of the nuclear reactor?
For a PWR, how about: Pressure Vessel, Closure Head Assembly, Core Support, Inlet/Outlet Nozzles, Fuel assemblies, Control Rods and Drive Mechanisms
