Control rod - Wikipedia
Control rods are used in nuclear reactors to control the rate of fission of the nuclear fuel – uranium or plutonium. Their compositions include chemical elements such as boron, cadmium, silver, hafnium, or indium, that are capable of absorbing many neutrons without themselves decaying.
Control Rods | Description, Types & Uses | nuclear-power.com
Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorption cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor. A control rod is removed from or inserted into the reactor core to increase or decrease the reactor’s ...
Control Rods in Nuclear Reactors
Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. They constitute a real-time control of the fission process, which is crucial for both keeping the fission chain reaction active and preventing it from accelerating beyond control. The nuclear fission chain reaction is the ...
What are nuclear reactor control rods? - Nuclear energy
2009年12月10日 · The control rods are one of the mechanisms to regulate the state of a nuclear reactor. The rods are often the most crucial element in a rapid shutdown of the reactor (the so-called emergency stop or scram). In pressurized water reactors, the rods hang in the reactor and work as a safety system.
The functional classifications of the reactor fuel and the control rods are as safety related equipment. The control rod velocity limiter is an engineered safety feature. The reactor fuel is comprised of uranium pellets (some including gadolinia) contained in fuel rods. The fuel rods are organized into fuel bundles.
Control rod - Energy Education
A control rod is a device that is used to absorb neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed down or stopped completely by inserting the rods further, or accelerated by removing them slightly.
OBJECTIVES. Identify the purposes of the control rod drive (CRD) system. Recognize the function and operation of the following: Strainers and filters. CRD pumps. Reactor recirculation pumps purge and cooling. Reactor water cleanup (RWCU) pumps purge …
fuel pellet composition. enrichment variations. burnable poisons. Identify the common failure mechanisms of fuel and recognize the mitigating strategies for those mechanisms. Explain why bottom entry control rods are used.
Reactor Power Control - Nuclear Power for Everybody
Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorption cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor. Control rods usually constitute cluster control rod assemblies inserted into guide thimbles within a nuclear fuel ...
Accident-tolerant control rods – ATCR - Nuclear Power for …
Control rods are used for maintaining the desired state of fission reactions within a nuclear reactor (i.e., subcritical state, critical state, power changes). They constitute a key component of an emergency shutdown system (SCRAM) .