Reply to thread

Message: <blockquote data-quote="kandya" data-source="post: 12896131" data-attributes="member: 289780">Adjust the power output of the reactor by controlling the number of neutrons are able to create more fissions. used control rods that are made of neutron poison to absorb neutrons. Absorb more neutrons in the rod control means that there are fewer neutrons available to cause fission, and the payment of the rod control deeper into the reactor will reduce its power output, and extract the rod control and increase it. in the first level of control of all nuclear reactors, a process of emission neutron delayed a number of neutron-rich isotopes of radioactive fission material is an important process. These delayed neutrons account for about 0.65% of the total production of neutrons in the fission, and the rest (the so-called "fast neutrons") to immediately release fission. Fission products that produce delayed neutrons have a half-life for decay by neutron emission, which range from the ground as long as several minutes. Keeping the reactor in the chain reaction of neutrons, where the delay necessary to achieve a state of critical mass, and allow time for operators of mechanical devices or human have time to control the chain reaction in "real time", otherwise the time between the investigation, forestry and nuclear meltdown as a result of the escalation of great power of a series of nuclear reactions normally be very short so as not to allow the intervention. in some nuclear reactors, the coolant also acts as an intermediary neutron. One of the editors over the power of the reactor by causing fast neutrons that are released from fission to the loss of energy, and thermal neutrons become. Thermal neutrons are more likely than fast neutrons to cause fission, and more means more moderation of neutron power output of the reactors. If the coolant is medium, then can be changes in temperature affect the density of coolant / supervisor, and thus change the power output. The coolant temperature rise is less dense and therefore less effective mediator. in other reactors as a coolant poison by absorbing neutrons in the same way that the control rods do. In these reactors produce energy can be increased by heating the coolant, making it less dense poison. [Citation needed] nuclear reactors generally automated systems and manual Scram reactor in an emergency stop. These systems introduce large quantities of poison (boron often in the form of boric acid) in the reactor to shut down if the fission reaction is detected unsafe conditions or anticipated. [6] most types of reactors are sensitive to a process known in various forms such as xenon poisoning, or a hole iodine. -135 Xenon produced in the process of nuclear fission as a "neutron poison" that absorb neutrons and thus tends to shut down the reactor. Can control the accumulation of xenon -135 by keeping energy levels high enough to destroy it as soon as it is produced. Fission also produces iodine -135, which in turn decays with a half-life less than seven hours, to New Xenon -135. When the reactor is shut down, iodine -135 is still to decay to xenon -135, which makes re-start the reactor more difficult for a day or two. This temporary state is the "hole iodine." If it has enough additional interaction energy reactor, it can be re-started. As over the additional xenon -135-136 at all, which is not a neutron poison, in a few hours the reactor faces "Xenon burnoff (power) passing." It must further control rods to replace the absorption of neutrons lost xenon -135. Failure to follow this procedure correctly and a major step in the Chernobyl disaster. [Citation needed] The reactors used in marine propulsion nuclear (nuclear submarines in particular) and can in many cases can not be played in power continued around the clock in the same way that run usually power reactors wild, and in addition to that often need to get on the lives of the basic very long without refueling. That's why many designs use highly enriched uranium but integrating burnable neutron poison directly into the fuel rods. [7] This allows the building of the reactor with a large surplus of fissile material, which is made in spite of the relatively safer than early in the reactor fuel burn cycle through the presence of materials that absorb neutrons, which are replaced later by the naturally produced toxins neutron long-term (up to the longest-lived of xenon -135) that builds up gradually over the operational life of the fuel load.translation</blockquote>

Verification: Asuwa dahayen wadi kalama keeyada?

Top Bottom