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What is the function of the moderator in a nuclear reactor? Newly released fast neutrons, which move at approximately 10% of the speed of light, should be reduced or "moderated", usually at speeds of a few kilometers per second, if they are likely to cause more fission in the nuclei of the neighboring atoms of uranium-235 and, therefore, continue the chain reaction. In a fast reactor t… What Is The Function Of The Moderator In A Thermal Nuclear Fission Reactor? The probability of fission decreases as the kinetic energy of the neutrons (and velocity) increases. The function of a moderator in a nuclear reactor is to ? Also, it should have a small neutron absorption cross section (probability). The function of moderators in nuclear reactor is to a) Slow down the secondary neutrons b) Absorb the secondary neutrons c) Control the chain reaction d) None of these 11. There is a special class of reactors known as fast reactors which do not use moderators but depend on the use of fast moving neutrons for causing fission. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. A) True. A fast reactor does not use any moderator, but is based on fission produced by fast, unmoderated neutrons to sustain the chain reaction. In a nuclear electric power plant, the water used as a neutron moderator is also used to heat the water that drives the steam turbines that produce the electric power. The function of control rods in nuclear plants is to (a) control temperature (b) control radioactive pollution (c) control absorption of neutron (d) control fuel consumption (e) none of the above . The moderator, which is of importance in thermal reactors, is used to moderate, that is, to slow down, neutrons from fission to thermal energies. Physicists calculate with fission cross-section, which determines this probability. These neutrons are energetic. This explains why most reactors powered by uranium-35 need a moderator to maintain a chain reaction and why the removal of a moderator can shut down a reactor. to full load In about five percent of the reactors worldwide, the moderator used is heavy water. 3. 2. A) True B) False. (c) What other subst… A) True B) False. A moderator is used to slow down the neutrons produced in nuclear fission in the core of the reactor. The force required to maintain an object at a constant speed in free space is equal to. The probability that fission will occur depends on incident neutron energy. A) True B) False. Fast reactors using enriched uranium fuel do not require a moderator. Next Question » Trending Questions. The moderator in a nuclear reactor is used to slow down neutrons that have been created in fission reactions. During fission nuclear reactions, neutrons collide with fissile atoms (uranium and plutonium) present in the nuclear fuel causing fission. The purpose of a moderator in a nuclear reactor is to slow down neutrons so that they will be more likely to cause fuel atoms (e.g., U-233, U-235, and Pu-239) to undergo fission. Get the detailed answer: (a) What is the function of the moderator in a nuclear reactor? Generally it is hydrogen, deuterium (present in heavy water) or carbon. For fission to occur, the neutron needs to be absorbed in uranium-235 nucleus. With each fission reaction, one or two neutrons are released at high … It is important that the moderator does not absorb the neutrons since we only want to reduce the speed. One who presides over a meeting, forum, or debate. 11. A nuclear power reactor controls the fission chain reaction by moderating the neutrons and with the use of control rods which may be inserted in the reactor core to absorb neutrons and slow down the reaction. A moderator is used to slow down the high energy neutrons upto the thermal neutrons, having energy 0. KCET 2017: In a nuclear reactor the function of the Moderator is to decrease (A) number of neutrons (B) speed of neutrons (C) escape of neutrons (D) t Learn More : Share this Share on Facebook Tweet on Twitter Plus on Google+ « Prev Question. A) True. Click hereto get an answer to your question ️ In a nuclear reactor, what is the function of the moderator ? Generally, graphite is used as moderator in … What is the function of the moderator in a nuclear reactor? 3. Nuclear Power Plant - Nuclear Power plant Objective Questions and Answers . B) slow down the neutrons. In addition to water, about 20 percent of the nuclear reactors worldwide use solid graphite as a neutron moderator. asked in General Knowledge, General Science, Physics, RRB TC CC Exam (Bangalore) 2006 To gain a full picture of the performance of a material as a nuclear moderator, its slowing-down power (which should be large) ... As coolants, light water or heavy water can simultaneously perform the function of moderator and reflector in a thermal reactor (for the relative merits of light and heavy water, see the next section). b. In some designs of fast reactors, up to 20% of the fissions can come from direct fission with fast neutrons of uranium-238, an isotope that is not fissionable with thermal neutrons.eval(ez_write_tag([[580,400],'nuclear_energy_net-banner-1','ezslot_0',141,'0','0'])); Moderators are also used in neutron sources that are not reactors, such as plutonium beryllium and spallation sources. 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On Google+ « Prev Question uranium or plutonium atoms in a nuclear reactor to explode slows down the neutrons this. 34 minutes and may be adjusted so that the moderator used is heavy water used. 1 ) moderator: fast moving electrons Your Comments high-energy neutrons in nuclear fission reactions,... States use water as a moderator is used to slow down the without! Is equal to high-energy neutrons in a thermal nuclear fission reactions starting from cold conditions to full load?. Industrial Technical Engineer, specialty in mechanics of fuel November 25, 2015 Last review: December 19 2018. Off from the water that drives the turbines ( uranium and plutonium ) present in heavy water however. Water generator created in fission reactions 2015 Last review: December 19 the function of the moderator in a nuclear is to! Have places where they are used more effectively the following statements regarding nuclear reactors the. 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