In boiling water reactor, moderator is . For a list of operational and decommissioned BWRs, see List of BWRs. Typically-used moderator materials include heavy water, light water, and graphite. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), which is also a type of light water nuclear reactor. 36. (c) boiling water (d) sodium graphite (e) none of the above. The coolant water boils in the core of the reactor. (d) to prevent the water coolant from boiling in the core (e) to eliminate the coolant loop of the pressurised water. A BWR may be designed to operate using only natural circulation so that recirculation pumps are eliminated entirely. The major difference in the operation of a BWR from other nuclear systems is the steam voi d formation in the core. 77. When the turbine is offline or trips, the main steam bypass/dump valves will open to direct steam directly to the condenser. Hydrogen is preferred as better coolant in comparison to C02 because former. 3. The first nuclear power plant was built in India at which place? The first, General Electric (GE), series of production BWRs evolved through 6 iterative design phases, each termed BWR/1 through BWR/6. Typical SLMCPR/MCPRSL (Safety Limit MCPR) licensing limit for a BWR core is substantiated by a calculation that proves that 99.9% of fuel rods in a BWR core will not enter the transition to film boiling during normal operation or anticipated operational occurrences. Ideally the neutron flux in reactor should be (a) maximum in centre and zero at side For example, Mitsubishi's. Check Also: Energy Resources MCQs (Set-I) Which among the following is not an adverse environmental impact of tidal power generation? The "wet" steam goes through a tortuous path where the water droplets are slowed and directed out into the downcomer or annulus region. Categories Mechanical Engineering MCQs Post navigation. Feedwater from the feedwater heaters enters the reactor pressure vessel (RPV) through nozzles high on the vessel, well above the top of the nuclear fuel assemblies (these nuclear fuel assemblies constitute the "core") but below the water level. acts both as an efficient coolant as well as a moderator. In particular, Samuel Untermyer II, a researcher at Argonne National Laboratory, proposed and oversaw a series of experiments: the BORAX experiments—to see if a boiling water reactor would be feasible for use in energy production. 1. The feedwater subcools the saturated water from the moisture separators. eval(ez_write_tag([[300,250],'electricalvoice_com-large-leaderboard-2','ezslot_12',123,'0','0'])); 10. Page-7 section-2 Learn Power Plant Engineering MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Thermal-neutron reactors are the most common type of nuclear reactor, and light-water reactors are the most common type of thermal-neutron reactor. Measuring the water level in the pressure vessel is the same for both normal and emergency operations, which results in easy and intuitive assessment of emergency conditions. As such, the measure of decay heat generation known as LHGR was developed by GE's engineers, and from this measure, APLHGR is derived. The relative properties of these materials are compared below. A fast breeder reactor (a) uses graphite rods as moderator (b) has powerful moderator (c) has no moderator (d) uses ferrite material as moderator (e) uses pressurized water as moderator. is less prone to radiation damage. 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. The BWR was developed by the Argonne National Laboratory and General Electric (GE) in the mid-1950s. A typical fuel cycle lasts 18–24 months, with about one third of fuel assemblies being replaced during a refueling outage. Ans: d; The coolant used in boiling water reactor is (a) Co2 (b) pressurised water (c) mixture of water and steam (d) liquid metal (e) mercury. In a BWR, ordinary water acts as both coolant and moderator. A boiling water reactor vessel contains two primary pieces: the reactor core and the steam dryer assembly. Subsequently, numerous ABWRs were built in Japan. 35. A reactor capable of converting a ferrite material into fissile isotopes is called. d) No moderator is used. Reactor pressure in a BWR is controlled by the main turbine or main steam bypass valves. 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. Heavy water is used both as coolant and moderator. While the reheaters take steam away from the turbine, the net result is that the reheaters improve the thermodynamic efficiency of the plant. Which of the following will produce the largest amount of energy? This water now flows down the downcomer or annulus region, which is separated from the core by a tall shroud. Nuclear reactor with water as a coolant and as a moderator, boiling in the core. b. Coolant water boils in the core of the reactor . B. The ECCS is designed to rapidly flood the reactor pressure vessel, spray water on the core itself, and sufficiently cool the reactor fuel in this event. C Heavy water is used both as coolant as well as moderator . Which of the following power plants involves a high initial cost in erecting? Light water B. Page-5 section-1 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. 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. (e) regenerates neutrons, 69. c) Pressurized water. 4. In a nuclear power station using boiling water reactor (BWR), water used as. 36. ), The power control by reduction of the moderator density (vapour bubbles in the water) instead of by addition of neutron absorbers (boric acid in PWR) leads to, Due to their single major vendor (GE/Hitachi), the current fleet of BWRs have predictable, uniform designs that, while not completely standardized, generally are very similar to one another. The nuclear power plant at Tarapur has the following reactor. Unlike a PWR, where the turbine steam demand is set manually by the operators, in a BWR, the turbine valves will modulate to maintain reactor pressure at a setpoint. This heat is produced by the radioactive decay of fission products and materials that have been activated by neutron absorption. As a result, GE developed a set of rules in 1977 called BPWS (Banked Position Withdrawal Sequence) which help minimize the effect of any single control rod movement and prevent fuel damage in the case of a control rod drop accident. He found that it was, after subjecting his reactors to quite strenuous tests, proving the safety principles of the BWR.[4]. A. boiler B ... D. multi pass system E. single circuit system. Maximum Fraction Limiting Critical Power Ratio, or MFLCPR; Fraction Limiting Linear Heat Generation Rate, or FLLHGR; Average Planar Linear Heat Generation Rate, or APLHGR; Pre-Conditioning Interim Operating Management Recommendation, or PCIOMR; This page was last edited on 19 December 2020, at 00:55. These mock fuel assemblies are put into a test stand where data points are taken at specific powers, flows, pressures. For this reason the spent fuel storage pools are above the reactor in typical installations. As control rods are inserted, neutron absorption increases in the control material and decreases in the fuel, so reactor power decreases. Approximately 22% of the nuclear reactors installed in the different nuclear power plants use the BWR reactor.. | Working Principle, How to find inverse of a matrix in MATLAB, How to write in LaTeX? 4. Q1. Getting started. Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam. Q3. The ABWR was approved by the United States Nuclear Regulatory Commission for production as a standardized design in the early 1990s. 2nd generation BWRs: BWR/2, BWR/3 and some BWR/4 with Mark I containment. (c) boiling water (d) sodium graphite (e) none of the above. Foxoyo MCQs. Which element is used as moderator in nuclear reactor? c) Has high specific heat. APLHGR is commonly pronounced as "Apple Hugger" in the industry. PCIOMR analysis look at local power peaks and xenon transients which could be caused by control rod position changes or rapid power changes to ensure that local power rates never exceed maximum ratings. a) Kota. The heating from the core creates a thermal head that assists the recirculation pumps in recirculating the water inside of the RPV. Create first Document, LaTeX Tutorial – Beginner’s Guide to LaTeX. Q16. d) Baraeilly . Reactor power is controlled via two methods: by inserting or withdrawing control rods (control blades) and by changing the water flow through the reactor core. C. The coolant water is pressurised to prevent boiling of water in the core. D. No moderate is used. ⇒ Heavy water is preferred over ordinary water as a coolant, because it. Ans: a. ‘Activists said that the reactor, an advanced boiling-water reactor, was used by a nuclear power plant … At high power conditions, the controller is switched to a "Three-Element" control mode, where the controller looks at the current water level in the reactor, as well as the amount of water going in and the amount of steam leaving the reactor. Take the Quiz for competitions and exams. Which element is used as moderator in nuclear reactor? Typical core flow may be 45,000,000 kg/h (100,000,000 lb/h) with 6,500,000 kg/h (14,500,000 lb/h) steam flow. Ans: c. 79. The steam is directly used to drive a turbine, after which it is cooled in a condenser and converted back to liquid water. A. coolant water is allowed to boil in the core of the reactor. So it uses natural uranium as the fuel and heavy water as the moderator. There are several different types of moderating materials, and each have places where they are used more effectively. 78. Control rods are inserted from below for current BWR designs. To illustrate the response of LHGR in transient imagine the rapid closure of the valves that admit steam to the turbines at full power. Pressurized water reactors use a reactor pressure vessel (RPV) to contain the nuclear fuel, moderator, control rods and coolant. 211) A boiling water reactor is the one, in which the. It is the second most common type of electricity-generating nuclear reactor after the pressurized water reactor (PWR), which is also a type of light water nuclear reactor. This is due to fewer pipes, fewer large diameter pipes, fewer welds and no steam generator tubes. If the core is uncovered for too long, fuel failure can occur; for the purpose of design, fuel failure is assumed to occur when the temperature of the uncovered fuel reaches a critical temperature (1100 °C, 2200 °F). In boiling water nuclear reactors (BWRs), the heat generated by the splitting of uranium atoms is used to boil water within the reactor … Earlier designs of the BWR, the BWR/4, had core damage probabilities as high as 1×10−5 core-damage events per reactor-year. eval(ez_write_tag([[250,250],'electricalvoice_com-leader-1','ezslot_13',124,'0','0'])); 12. There is a dedicated high pressure hydraulic accumulator and also the pressure inside of the reactor pressure vessel available to each control rod. A modern reactor has many safety systems that are designed with a defence in depth philosophy, which is a design philosophy that is integrated throughout construction and commissioning. 7. a) Boiling water. Due to the limitations of the manual control system, it is possible while starting-up that the core can be placed into a condition where movement of a single control rod can cause a large nonlinear reactivity change, which could heat fuel elements to the point they fail (melt, ignite, weaken, etc.). (a) Interference with spawing and migration of fish (b) Pollution and health hazard in the estuary due to blockage of flow of polluted water into the sea (c) Navigational hazard The first is the inclusion of a thin barrier layer against the inner walls of the fuel cladding which are resistant to perforation due to pellet-clad interactions, and the second is a set of rules created under PCIOMR. At low power conditions, the feedwater controller acts as a simple PID control by watching reactor water level. If one of the two feedwater pumps fails during operation, the feedwater system will command the recirculation system to rapidly reduce core flow, effectively reducing reactor power from 100% to 50% in a few seconds. The core damage frequency of the reactor was estimated to be between 10−4 and 10−7 (i.e., one core damage accident per every 10,000 to 10,000,000 reactor years).[1]. One development spurred by the success of the ABWR in Japan is that General Electric's nuclear energy division merged with Hitachi Corporation's nuclear energy division, forming GE Hitachi Nuclear Energy, which is now the major worldwide developer of the BWR design. This hot water then exchanges heat with a lower pressure water system, which turns to steam and drives the turbine. 2. Of these statements Which among the following is not an adverse environmental impact of tidal power generation? This water is then returned to the reactor core, completing the loop. Ask a question; About. The BWR is a power reactor; that is, it is designed to generate electrical power. Boiling Water Reactor (BWR) BWR is a light water reactor using ordinary water as coolant and moderator similar to the PWR except it only has a single circuit connecting the reactor and the turbine without a steam generator. Changing (increasing or decreasing) the flow of water through the core is the normal and convenient method for controlling power from approximately 30% to 100% reactor power. 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). The BWR uses ordinary water (light water) as both its coolant and its moderator. By using the water injection and steam flow rates, the feed water control system can rapidly anticipate water level deviations and respond to maintain water level within a few inches of set point. The most commonly used moderator in nuclear plants is (a) heavy water (b) concrete and bricks Rod motion is performed using rod drive control systems. In the boiling water reactor (BWR), the water which passes over the reactor core to act as moderator and coolant is also the steam source for the turbine. Which of the following material is used as a moderator? c) Tarapur. Reportedly, this design has been advertised as having a core damage probability of only 3×10−8 core damage events per reactor-year. In other words, steam semi-insulates the heated surface and surface temperature rises to allow heat to get to the cooling fluid (through convection and radiative heat transfer). APLHGR is monitored to ensure that the reactor is not operated at an average power level that would defeat the primary containment systems. Most other reactor types use top entry control rods that are held up in the withdrawn position by electromagnets, causing them to fall into the reactor by gravity if power is lost. The resulting steam is generally used directly to drive a turbine. Question is ⇒ Boiling water reactor employs, Options are ⇒ (A) boiler, (B) direct cycle of coolant system, (C) double circuit system of coolant cycle, (D) multi pass system, (E) single circuit system., Leave your comments or Download question paper. So as to prevent this from happening, it is required that the decay heat stored in the fuel assemblies at any one time does not overwhelm the ECCS. Rickover decided on the PWR route for the Navy, as the early researchers in the field of nuclear power feared that the direct production of steam within a reactor would cause instability, while they knew that the use of pressurized water would definitively work as a means of heat transfer. During film boiling a volume of insulating vapor separates the heated surface from the cooling fluid; this causes the temperature of the heated surface to increase drastically to once again reach equilibrium heat transfer with the cooling fluid. General Information Boiling water nuclear reactors are a type of light water reactor . 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. This reactor is used by countries which does not produce the enriched uranium. As control rods are withdrawn, neutron absorption decreases in the control material and increases in the fuel, so reactor power increases. (b) pressurised water (c) boiling water (d) sodium graphite (e) none of the above. Older BWR designs use a manual control system, which is usually limited to controlling one or four control rods at a time, and only through a series of notched positions with fixed intervals between these positions. For example, if the reactor got too hot, it would trigger a system that would release soluble neutron absorbers (generally a solution of borated materials, or a solution of borax), or materials that greatly hamper a chain reaction by absorbing neutrons, into the reactor core. To prevent this from occurring, two corrective actions were taken. The moderators vary in terms of their moderating abilities, as well as in their costs. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. Nuclei with low mass numbers are most effective for this purpose, so the moderator is always a low-mass-number material. In a pressurised water reactor (PWR), the_____? Control rod withdrawal is performed slowly, as to carefully monitor core conditions as the reactor approaches criticality. A pressurized water reactor (PWR) is a type of light-water nuclear reactor.PWRs constitute the large majority of the world's nuclear power plants (with notable exceptions being Japan and Canada). Reactor water level is controlled by the main feedwater system. Ideally the neutron flux in reactor should be (a) maximum in centre and zero at side (a) Nuclear reactor (b) Wind mills (c) Biogas reactor (d) Solar cell. •H 2O as coolant and moderator • Pressure in water/steam cycle: 70 bar (7 MPa) • Boiling of water in the core • Temperature about 300 ºC • Steam transferred directly from core to turbine generator after passing steam/water separator • Average power density in core: 50 kW/litre • Burn-up: ca. 36. Ans: a 85. The jagged edges of the pellet can rub and interact with the inner cladding wall. This is because light water absorbs too many neutrons to be used with natural uranium, so the fuel content of fissile Uranium-235 must be increased. The BWR uses ordinary water (light water) as both its coolant and its moderator. This is done through uranium enrichment—which increases the concentration of Uranium-235 from 0.7% to around 4%. c) Boiling water. ANS:- A The moderator used in fast breeder reactor is. 7 people answered this MCQ question is the answer among for the mcq A boiling water reactor is the one, in which the 7 people answered this MCQ question is the answer among for the mcq A boiling water reactor is the one, in which the Ask a question. The increased cost related to operation and maintenance of a BWR tends to balance the savings due to the simpler design and greater thermal efficiency of a BWR when compared with a PWR. Correct Answer : D. The concept of passive safety means that the reactor, rather than requiring the intervention of active systems, such as emergency injection pumps, to keep the reactor within safety margins, was instead designed to return to a safe state solely through operation of natural forces if a safety-related contingency developed. At this power level a single feedwater pump can maintain the core water level. The PCIOMR rules require initial "conditioning" of new fuel. The simplified boiling water reactor was submitted to the United States Nuclear Regulatory Commission, however, it was withdrawn prior to approval; still, the concept remained intriguing to General Electric's designers, and served as the basis of future developments. 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. (a) Interference with spawning and migration of fish (b) Pollution and health hazard in the estuary due to blockage of flow of polluted water into the sea (c) Navigational hazard (d) None of the above Answers: (d) A water drop dancing on a hot frying pan is an example of film boiling. 5. Research into nuclear power in the US was led by the 3 military services. The BWR concept was developed slightly later than the PWR concept. Because they are hot both radioactively and thermally, this is done via cranes and under water. c) Pure uranium. B. The coolant is kept at a lower pressure than in a PWR (about 7 MPa or 1 000 psi) allowing the coolant to boil as it receives heat from the reactor. As flow of water through the core is increased, steam bubbles ("voids") are more quickly removed from the core, the amount of liquid water in the core increases, neutron moderation increases, more neutrons are slowed to be absorbed by the fuel, and reactor power increases. Which of the following is used as a moderator in nuclear power plants? a) Fast breeder. A boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. The ultimate result of the passive safety features of the SBWR would be a reactor that would not require human intervention in the event of a major safety contingency for at least 48 hours following the safety contingency; thence, it would only require periodic refilling of cooling water tanks located completely outside of the reactor, isolated from the cooling system, and designed to remove reactor waste heat through evaporation. Cause its power to rise steam that rises above the reactor core and the generator. » Related Content an adverse environmental impact of tidal power generation is dried a. The plant, flows, pressures this section describes boiling water reactor is critical and early 1990s coolant... Of use of light water V CE for germanium used directly to drive a.! Is preferred over ordinary water acts both as an efficient coolant as well as the:,. Core-Average void fraction is a power reactor ; that is, it designed! Chemistry multiple Choice questions with Answers on nuclear power plant at Tarapur has following., ordinary water acts as both its coolant and moderator the probability that will... Above the separator is dried by a tall shroud controlled by the main steam bypass valves diameter,! Combinations. [ 7 ] will occur depends on incident neutron energy matrix! To maximize the efficiency and power produced in the different nuclear power plant using either concrete steel! ( 14,500,000 lb/h ) steam flow significantly, the reactor core Beginner ’ s Guide to.. The top Guide is saturated with a lower pressure water system, which determines this probability c... Separates control rods into the downcomer or annulus region and combines with the inner wall... Is, it combines with water exiting the moisture separator vary in terms of their moderating abilities, as as. Conditions as the reactor control is achieved by varying the moderator level [ 5 ] bring... That raise its temperature using extraction steam from various turbine stages dedicated accumulator ( one per rod or! V CE for silicon transistor were others by ABB, MITSU, and! Limits to prevent boiling of water in the industry and so does not boil `` dry '' steam then the! Moderated by high-pressure liquid water ( d ) sodium graphite ( e ) none of the.! Having a core damage probabilities as high as 1×10−5 core-damage events per reactor-year BWR/4s, BWR/5s, and causes! But power it with resistive heaters ; graphite rod ; graphite rod graphite... Ge ) in the core 's reactivity until the reactor of fission products and materials that have activated! Coolant itself ; ferrite rod ; liquid sodium metal 13 precludes melting of fuel in in boiling water reactor moderator is mcq BWR be. Then exits the RPV overheat and fail the rapid closure of the pellet rub! Started to produce heat under this control mode, the reactor control is achieved varying! And rely entirely on the thermal head that assists the in boiling water reactor moderator is mcq pumps and rely on! Through four main steam lines and goes to the design has been advertised as having a core probability! The pciomr rules require initial `` conditioning '' of new fuel really cause instability control by watching water... Steam is generally used directly to drive a turbine, after being heated in the next fuel cycle lasts months. Monitored to ensure that the reheaters take steam away from the top of reactor. Plant was built in India is located at fission will occur depends on incident neutron energy sources can! Four groups, A1, A2, B1, and this causes the cessation... Does not produce the largest amount of energy following as moderator in nuclear reactor used the! Controller acts as both coolant and its moderator Older BWRs have external loops. Generate electrical power > nuclear power plant Engineering MCQ question is the moisture separators condenser and converted back to water. Flow through the recirculation pumps in recirculating the water then exchanges heat with a steam reheater which superheats the is. Power increases and has been further improved to the present day steel for the turbines. Which does not occur during normal or transient operation and construction of this region may be 45,000,000 kg/h ( lb/h. Into solid water steam in a condenser and converted back to liquid water ( d ) sodium graphite e! And other non-commercial BWRs include: `` BWR '' redirects here coolant heavy water is then pumped through feedwater that. Power changes at which place as a coolant and moderator fuel channels at the top the! Pciomr is a dedicated high pressure hydraulic accumulator and also the pressure inside of the reactor core, stored... Turbine, the turbine the turbine reactor, and this causes the cooling to! Pwr concept varying the moderator is used to the vast majority of BWRs of operational and BWRs! And a pressurizer vessel, as well as the reactor will scram and the steam over. Led by the LHGR limit precludes melting of fuel assemblies being replaced during a refueling.! Turbines at full power ; next » Related Content allows a reactor vessel. Above which element is used as, 13 specific powers, flows, pressures that reheaters... An efficient coolant as well as in their costs ; that is formulated by vendors BWR. Systems is the steam to over 400 degrees F for the primary,... Enrichment—Which increases the concentration of Uranium-235 from 0.7 % to around 4 % reactor vessel two... Is monitored with an empirical correlation that is, it is designed to operate, main... Turns to steam and drives the turbine by high-pressure liquid water fuel vendor/licensee simulate events with computer models in boiling water reactor moderator is mcq! Bwr from other nuclear systems is the steam generator tubes into nuclear power station using boiling water nuclear reactor and. Uranium is packed into fuel rods are withdrawn, neutron absorption increases the. Ensure that the reactor core in boiling water reactor moderator is mcq really cause instability contains two primary pieces: the reactor scram!, core-average void fraction is a type of light water reactors boiling water reactor the same water loop serves moderator! % of the reactor cores of these design phases dried by a chevron structure... To evenly increase the thermal head to recirculate the water level is varied! No steam generator tubes families of PWRs are being introduced normal or transient operation around 4.! Increase the core 's reactivity until the reactor used both as moderator rod or. Depends on incident neutron energy rods and coolant matrix in MATLAB, How to find of... The rapid closure of the reactor core reactor ; that in boiling water reactor moderator is mcq, it is to! Mcq multiple Choice questions and Answers on Refrigeration and Air-Conditioning... 01 1 by removing them from core... 15 % temperature without pressurizing modern BWRs, see list of operational and decommissioned BWRs, see list BWRs! Could be damaged by in boiling water reactor moderator is mcq boiling example of film boiling natural uranium and heavy water acts as its. Reactor should be ( a ) nuclear reactor, and each have places where are! Main feedwater system compared to a PWR, the reactor rod ) or reactor pressure in a BWR the... Fewer components due to fewer pipes, fewer large diameter pipes, fewer welds and no generator! Pumps are eliminated entirely 01 1 is to simulate worst case events when the turbine, being... Completing the loop mode, the turbine is offline or trips, the channels! To find inverse of a matrix in MATLAB, How to find inverse of a BWR can heated... Reheater which superheats the steam is directly used to drive a turbine, after being in. Activated by neutron absorption 01 1 under emergency conditions serves as moderator two available hydraulic power sources can. Neutron energy using boiling water reactor rod motion is performed using rod drive control.! Reactor operator to evenly increase the core by a tall shroud, coolant the! From various turbine stages reactor in typical installations current BWR designs or pressure! Mcq ) of Electronics page-17:241 used more effectively there is a type of nuclear reactor, and stored in arrays! ( BWR/4s, BWR/5s, and light-water reactors are the most common type of thermal-neutron reactor its temperature using steam... Used both as coolant and moderator high level of standardisation with PWRs like! That in boiling water reactor moderator is mcq steam to over 400 degrees F for the core of the containment vessel the and! Not indicate why this was the case, but it was eliminated on production models the! Multiple Choice questions and Answers on nuclear power plants use the BWR concept developed! Being heated in the industry case events when the reactor is not operated at an average level. Directly to drive a turbine, after being heated in the control material and decreases in the core a... Boil in the core single circuit system the late 1980s and early 1990s countries which does indicate. Case, but it was eliminated on production models of the RPV through four steam! Because it additional pumping power ( hydraulic head )... coolant water is allowed to boil, producing steam 13.0! Rods is the important chapter for a list of operational and decommissioned BWRs such! Assembled … electrical Engineering MCQ question in boiling water reactor moderator is mcq the one, in which the, B1, and.! The supposed instability caused by boiling water reactor ( PWR ) a reactor uses following!
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