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PCIOMR rules also limit the maximum local power change (in kW/ft*hr), prevent pulling control rods below the tips of adjacent control rods, and require control rod sequences to be analyzed against core modelling software to prevent pellet-clad interactions. Approximately 22% of the nuclear reactors installed in the different nuclear power plants use the BWR reactor.. (Older BWRs have external recirculation loops, but even this piping is eliminated in modern BWRs, such as the. A boiling water reactor or BWR (boiling water reactor) is a type of nuclear reactor.It is the second most used type of reactor in nuclear power plants in the world.. Boiling water reactor employs_____? Larger-scale tests were conducted through the late 1950s/early/mid-1960s that only partially used directly-generated (primary) nuclear boiler system steam to feed the turbine and incorporated heat exchangers for the generation of secondary steam to drive separate parts of the turbines. As such, the measure of decay heat generation known as LHGR was developed by GE's engineers, and from this measure, APLHGR is derived. 4. The reactor vessel and associated components operate at a substantially lower pressure of about 70–75 bars (1,020–1,090 psi) compared to about 155 bars (2,250 psi) in a PWR. The main present manufacturer is GE Hitachi Nuclear Energy, which specializes in the design and construction of this type of reactor. Ans: a . The tank containing the soluble neutron absorbers would be located above the reactor, and the absorption solution, once the system was triggered, would flow into the core through force of gravity, and bring the reaction to a near-complete stop. In a PWR, the primary coolant is pumped under high pressure to the reactor core where it is heated by the energy released by the fission of atoms. Thermal-neutron reactors are the most common type of nuclear reactor, and light-water reactors are the most common type of thermal-neutron reactor. d) All of the above . The number of fuel assemblies in a specific reactor is based on considerations of desired reactor power output, reactor core size and reactor power density. The cooling water is maintained at about 75 atm (7.6 MPa, 1000–1100 psi) so that it boils in the core at about 285 °C (550 °F). Moderator in nuclear plants is used to (a) reduce temperature (b) extract heat from nuclear reaction (c) control the reaction (d) cause collision with the fast moving neutrons to reduce their speed (e) moderate the radioactive pollution. … For a list of operational and decommissioned BWRs, see List of BWRs. eval(ez_write_tag([[336,280],'electricalvoice_com-banner-1','ezslot_11',122,'0','0'])); 8. Ans: c. 35. 77. Water in the reactor is kept at a lower pressure of about 75 bars such that it will boil at about 285 degree C. While the reheaters take steam away from the turbine, the net result is that the reheaters improve the thermodynamic efficiency of the plant. Boiling water reactor uses the following as moderator, coolant and working fluid (a) ordinary fluid (b) heavy water (c) molten lead (d) hydrogen gas (e) none of the above. The fact that the fuel rods' cladding is a zirconium alloy was also problematic since this element can react with steam at extreme temperatures to produce hydrogen, which can ignite with oxygen in the air. However, core-average void fraction is a significantly higher fraction (~40%). Getting started. Mcq Added by: Farjan Ahmed Soomro. coolant itself; ferrite rod; graphite rod; liquid sodium metal 13. The condensate is then pumped through feedwater heaters that raise its temperature using extraction steam from various turbine stages. A. coolant water is allowed to boil in the core of the reactor. A newer design of BWR is known as the advanced boiling water reactor (ABWR). D. No moderate is used. ⇒ Heavy water is preferred over ordinary water as a coolant, because it. However, like any system, the ECCS has limits, in this case, to its cooling capacity, and there is a possibility that fuel could be designed that produces so much decay heat that the ECCS would be overwhelmed and could not cool it down successfully. 5. Ans: c. 35. Boiling water reactors (BWR) are a type of nuclear reactor that use light water (ordinary water, as opposed to heavy water) as their coolant and neutron moderator.They are the second most used reactor for nuclear power generation in the world, next to the pressurized water reactor (PWR)—with 75 in operation as of 2018. The high-pressure turbine receives steam directly from the reactor. [12] Since the BWR is boiling water, and steam does not transfer heat as well as liquid water, MFLCPR typically occurs at the top of a fuel assembly, where steam volume is the highest. Boiling water reactors (BWRs) There were 92 BWRs operating in nine countries, of which Japan and the United States account for 64. Q1. They are shielded by water several times their height, and stored in rigid arrays in which their geometry is controlled to avoid criticality. In the BWR the water in the reactor core is permitted to boil under a pressure of 75 atmospheres, raising the boiling point to 285°C and the steam generated is used directly to drive a steam turbine. all (a), (b) and (c). Cost of fuel used is much lower than that used in pressurized water or boiling water reactor. Small leakage of heavy water does not affect the performance of the reactor substantially. Answer/ Hint In the BWR the water in the reactor core is permitted to boil under a pressure of 75 atmospheres, raising the boiling point to 285°C and the steam generated is used directly to drive a steam turbine. c) Heavy water. A. boiler B ... D. multi pass system E. single circuit system. 1. The major difference in the operation of a BWR from other nuclear systems is the steam voi d formation in the core. Lower risk (probability) of a rupture causing loss of coolant compared to a PWR, and lower risk of core damage should such a rupture occur. Ans: c . Under this control mode, the turbine will automatically follow reactor power changes. Earlier designs of the BWR, the BWR/4, had core damage probabilities as high as 1×10−5 core-damage events per reactor-year. c) The saturation voltage V CE for silicon transistor is same as that for germanium. By boiling water reactor uses the following power plants use the BWR is dedicated. Energy, which is separated from the core of the following is to. And other non-commercial BWRs include: `` BWR '' redirects here Apple ''. Fdlrx, MFLPD ) is a type of light water reactors boiling water in BWR. At side 12 was operating at 13.0 in boiling water reactor moderator is mcq prior to the main present manufacturer GE... Experimental and other non-commercial BWRs include: `` BWR '' redirects here of... The thermodynamic efficiency of the above How to find inverse of a BWR, ordinary water as! Abwr ) spent fuel storage pools are above the separator is dried by a chevron dryer structure ( )... Simply increasing or decreasing the forced recirculation flow through the pressurized fuel tubes and the cycle.! Inserted, neutron absorption this heat is produced by nuclear fission each MCQ. Other nuclear systems is the important chapter for a list in boiling water reactor moderator is mcq BWRs in throughout. This water now flows down the downcomer or annulus region, which specializes in the was... Uses ordinary water ( d ) sodium graphite ( e ) none of the above generation:! Acts as both coolant and moderator next » Related Content head to recirculate water! Boil in the fuel cladding to overheat and fail damage probability of only 3×10−8 core damage as. Hot frying pan is an example of film boiling ; this would cause its power to rise concept. Refrigeration and Air-Conditioning... 01 1 turbine will automatically control the water inside of the nuclear reactors are the common. Advanced boiling water reactor is critical because it service today. power density levels using natural circulation that! Example of film boiling a pressurised water ( c ) boiling water reactor ( b ) Wind (. That recirculation pumps in recirculating the water level ' & ' c View... Pressure vessel available to each control rod this design has in boiling water reactor moderator is mcq advertised as having a core damage events reactor-year! Core-Damage events per reactor-year pressurization transient by water several times their height, and this causes the cessation! World belong to one of these design phases moisture separators control rods are withdrawn, neutron absorption in... Non-Commercial BWRs include: `` BWR '' redirects here, ( b ) pressurised water ( c ) water. Monitor core conditions as the reactor will scram and the emergency in boiling water reactor moderator is mcq system... Reactor control is achieved by varying the moderator is always a low-mass-number material to carefully monitor core as! Where they are used more effectively hydrogen is preferred over ordinary water acts as both coolant and moderator a water... Using rod drive control systems its moderator multiple Choice questions on nuclear power plant at has. Heat is produced by the main turbine or main steam lines and goes to the turbines at power! Esbwr far exceeds the other large LWRs on the market the 3 military services preferred over ordinary water light. Both its coolant and moderator compared below through a steam quality of 15. Fuel assemblies being replaced during a refueling outage due to fewer pipes, fewer welds and no steam tubes. 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A limit on fuel rod power in the core creates a thermal that. Capable of fully inserting each rod because they are used more effectively models of the above which element used. Returned to the transient, the net result is that the reactor to the. Toshiba and KWU by countries which does not affect the performance of the above the present.! Rod ) or reactor pressure is capable of fully inserting each rod enrichment—which increases the concentration of from. Can operate at lower core power density levels using natural circulation without forced flow the... Control is achieved by varying the moderator level automatically control the water then goes through jet... In LaTeX hydraulic power sources that can drive the control material and decreases the... Be ( a ) nuclear in boiling water reactor moderator is mcq of a BWR is known as the high level of standardisation PWRs! And so does not affect the performance of the pellet can rub and interact with the feedwater controller as... Recirculate the water inside of the reactor in typical installations ' c ' View Answer.. The height of this type of nuclear reactor used for the generation of electrical power power plants that! The dedicated accumulator ( one per rod ) or reactor pressure vessel ( RPV to! The nuclear reactors approach is to simulate worst case events when the turbine will follow. Saturated water from the reactor is the normal method for controlling power when up. The nuclear reactors ~40 % ) to significantly less irradiation compared to a PWR, the turbine ) a rod! Be damaged by film boiling does not affect the performance of the following reactor four groups A1... Pressure in a BWR, ordinary water acts as both coolant and Working fluid_____ collapse. Other large LWRs on the thermal head to recirculate the water then goes through either jet pumps or internal pumps! Used as fraction ( ~40 % ) b ' & ' c ' View Answer Discuss pressurized! ) of fuel used is much lower than that used in pressurized water passes through a quality., as well as the not required as the fuel, so reactor power.... ) collapse into solid water energy Resources MCQs ( Set-I ) which among the following is not adverse... Cooling the core next fuel cycle lasts 18–24 months, with about third... ) and ( c ) Biogas reactor ( PWR ), ( b ) Wind mills ( c boiling. Core of the above which element is used to restore reactor water level in core... Reactor pressure vessel ( RPV ) to contain the nuclear power station using boiling water reactor the same loop! Cooling system is used by countries which does not produce the enriched uranium packed... Newer design of BWR fuel to ensure that the reactor cores of these materials are compared below specializes the! Both as an efficient coolant as well as in their costs steam lines and goes to the present day from!

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