The primary function of the reactor coolant system is to transfer the heat from the fuel to the steam generators. Pressurized water reactor pwr nuclear plants featuring the westinghouse model 93, 93a, 93a1 and 100 rcps. Since developing the first hydrostatic rcp seals in the 1960s, westinghouse has. Engineering new pump models and modifying existing designs to fit the specific duty conditions of these new reactors, flowserve has already achieved certified supplier status with several advanced reactor design firms. Pumps n valves n service applications n eactor coolant recirculation in boiling water reactors ore information. Recent advanced largescale pressurized water reactors regularly adopt the canned motor pumps as their reactor coolant pumps. When seal injection is lost, seal flow is supplied by reactor coolant leaking up along the pump shaft. Most substances expand w hen heated and contract when cooled.
Normal power for the pumps is supplied through four. Is it possible to switch off the coolant pump for the. A reactor coolant loop is a reactor coolant pump, a steam generator, and the piping that connects these components to the reactor vessel. In this case the nail is a reactor coolant pump, the largest one in the world, equipment that evidently doesnt exist and for which there is only one supplier.
Also, it prevents expansion of the trouble at the time of the trouble of the coolant loss by injecting boric acid of the fuel replacement water pump into the reactor core. The coolant system plays a pivotal role in performing this function. There are currently two versions of the coolant injector, rsh and lzh, which repair the rshcondensator and lzhcondensator respectively as of 2. Bulletins 7905a, 7906a, and 7906b were issued immediately after the. The pump being redesigned is a reactor coolant pump manufactured by the emd division of the curtisswright company.
Projects included analyzing the impact of a potential fire on equipment located in key areas of the plant, replacing the incore instrumentation sensor system that monitors reactor fuel conditions, and removing and replacing a reactor coolant pump motor that weighs 57 tons. Reactor coolant pump seal hardware npcsupplied parts are currently in operation in more than half of the u. The method includes removing a lower guide bearing support to enhance circulation of the oil to facilitate cooling of the oil and operating the reactor coolant pump motor at 1,500 rpm without the lower guide bearing support or. The reactor coolant system has four reactor coolant pumps rcps. Pdf westinghouse reactor coolant pump seal rcp technology is used by approximately 50% of the global nuclear fleet.
Curtisswright flow control emd and westinghouse electric company llc say they are continuing testing of the worlds largest cannedmotor reactor coolant pump rcp for the ap. Such zirconiacrud agglomerates may be readily filtered from the coolant. Mechanical aptitude is essential and experienced mechanics are desired. The reactor coolant pump, which contains three major components the motor, the hydraulic section, and the seal package, is used to cool the machine. In addition there are a number of auxiliary and safety systems which can interface with the rcs and these are discussed later.
These pumps generally pump at a rate of almost 100,000 gallons per minute. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission. Productlubricated bearings, no oil supply systems required. The reactor coolant volume changes with temperature because of changes in density.
Reactor coolant pump speed sensor operating environment temperature up to 311f 155. The reactor coolant pumps rcps are centrifugal pumps which maintain reactor coolant flow approximately 114,625 gpm per pump. The reactor coolant injector is a machine that repairs condensators in a nuclear reactor, in support of singleuse coolant configuration or succ design recipe. Unit 3 pump 1b smartsignal ecm detected the onset of degradation for unit 3 reactor coolant pump 1b, first stage seal. A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. Reactor coolant pump bearings and seals nme30c0001h001 page 12 primary piping removal the reactor coolant system must be drained below the level of the center of the hot leg, vented, and purged of hydrogen. Reactor coolant system an overview sciencedirect topics. State the purpose of the reactor coolant pump instrumentation. If the bp and lbb principles are applied to the pressuriser connecting line, the. Design process for an advanced reactor coolant pump for a. Unsteady flow phenomena of axialflow reactor coolant pump. Reactor coolant is not as clean as seal injection, potentially causing debris clogging the seals. There is a certain amount of natural convection that will keep the reactor from overheating. The reactor coolant port is a block used in the construction of reactor structures from big reactors.
The reactor coolant pump circulates the water through the reactor coolant system. A method of upgrading a 1,500 rpm reactor coolant pump motor having a vertically oriented rotor shaft supported by a lower guide bearing disposed in an oil reservoir. Click the figure to see a 51k detailed drawing of the reactor coolant pump with parts identified. Thermoelastohydrodynamic modeling of hydrostatic seals in. Provides access to the reactor s hotfluid tank steam. Sealless design with integrated wet winding motor and integrated flywheel. Steam generator and reactor feed water pump the preferred supplier of reactor and steam generator feed pumps in the 1960s flowserve pioneered the development of singlestage, highspeed feed pumps for commercial nuclear power plants npp. The rcp forces the coolant through the reactor core and steam generator. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. The main coolant pumps continually pump pressurized water for t.
The reactor coolant system rcs of a typical four loop 1200 mwe pwr consists of the reactor core within its pressure vessel, four coolant loops with pumps, the primary side of the steam generators and a pressuriser. Nobel gas fission products escaped from faulty fuel pins. The design flow through each pump is approximately 6. Installing one or more of these on a reactor will change it from producing energy to producing steam. Advanced design of reactor coolant pump motors sciencedirect. Not if you want to run the submarine without causing chaos after a certain amount of time. Reactor coolant pumps which ensure coolant flow into the core of nuclear power plants are provided with three mechanical seals arranged in series. British electricity international, in nuclear power generation third edition, 1992. Combustion engineering pressurized water reactors used at palo verde transfer highpressure water. This nuclear reactor utilizes natural circulation which is capable of operating at a significant fraction of full power without reactor coolant pumps.
It provides an interface for pumping coolant in and superheated steam out of the reactor. Psr reactor coolant pump for boiling water reactors. Us4842812a reactor coolant crud control by particulate. Pdf monitoring pressurized water reactor transients using. Therefore the reactor coolant pump seals have a strenuous and important job. Improve departure from nucleate boiling ratio during loss of all reactor coolant pump motor power, and 3. In the isar 2 power plant, a pressurised water reactor produces, with the help of one of the biggest generators in the world, a net output of 1,410 mw. Proceedings of the asme 2005 fluids engineering division summer meeting. Reactor coolant pump rcp motors for nuclear generating stations have to satisfy special demands in view of the crucial role they play in plant safety and. The heat transfer characteristic of the reactor coolant pump canned.
Vver 1200 aes2006 design basics spbaep version 21 main components of the vver 1200 aes2006 plant 26 reac tor pressure vessel main coolant piping reactor coolant pump steam generator pressurizer reactor core and fuel assemblies turbine sty afe32 safety requirements and principles 36 provision of fundamental safety functions 37. Design process for an advanced reactor coolant pump for a 1400 mw nuclear power plant. It is used to force the coolant circulating in the primary loop of the pressurized water reactor pwr, thus transferring heat from the nuclear fuel core to the steam generator 1. This extends the deceleration time of the pump and. Westinghouse has designed, manufactured and repaired hundreds of reactor coolant pumps rcps for the global market, allowing. The 220 mwth s8g reactor compartment for the ohio submarines is 42 feet m in diameter, 55 feet 17 m long and weights 2,750 tons. Knierim, claus, baumgarten, sven, fritz, jochen, and coon, michael t. The port will automatically attempt to pump fluids into compatible adjacent blocks or pipes. To switch between these modes, simply rightclick the coolant port with a wrench or an empty hand. The reactor coolant pump rcp is a key piece of equipment in a nuclear power plant. Reactor coolant pumps in pwr nuclear power stations are typically driven by a squirrel cage induction motor scim with vertical shaft. State the safetyrelated function of the rcp motor flywheel. Lightweight and quick to installremove, the fme cover is used to maintain fme foreign material exclusion integrity during maintenance evolutions. Supply a technical report addressing the structural integrity considerations related to a clad ferritic pump bowl casing to support onrs assessment of the pump bowl integrity case.
Monitoring pressurized water reactor transients using reactor coolant pumps article pdf available in nuclear science and engineering. Reactor coolant pump for pressurized water reactor higher ratings on request 1 100 % tightness n three mechanical seals doubleredundant plus two standstill seals 2 integrity under upset conditions n cooling of mechanical seals through thermosyphon effect 3 operational safety n productlubricated guide bearing 4 perfect rotor alignment. During testing on may, testing of the ap pressurized water reactor rcp was successfully completed in ambient operating conditions. Explain how the rcp seal minimizes leakage of t l t t th t i t b ildif reactor coolant to the containment building atmosphere. Masterlees rcp fme cover is a critical component which should be utilized on every rcp seal maintenance project. Verification of vver1200 npp simulator in normal operation. Transient twophase performance of loft reactor coolant pumps. There are four of these pumps in each westinghouse ap pressurized water reactor. A separate regulatory assessment report is provided to consider the adequacy of the. The crud will be attracted to the surfaces of the zirconia particles and caused to agglomerate thereon. Support the ongoing assessment of the flywheel disintegration safety case.
At normal operation, there is a compressed liquid water inside the reactor vessel, loops and steam generators. Function reactor coolant pump description vertical, singlestage reactor coolant pump. Application main coolant circulation in thirdgeneration nuclear power plants. Pump selection and application in a pressurized water reactor electric generating plant, by david m. If the reactor is at power at the time of the event, the immediate effect of the loss of coolant flow is a rapid increase in the coolant temperature. In may 2010, nuclear engineering international published an article that announced that the coolant pumps for the first ap reactors had been successfully tested at normal operating. Cooling systems naturally ensure a heat transfer from a reactor core to steam generators, which is the main purpose of the cooling systems. Early warning of reactor coolant pump seal degradation. Removes an yy gases in coolant downstream of condenser they must be held up and stabilized. This pump removes the heat of the primary reactor coolant after the reactor is stopped and lowers its temperature.
Frequently, a chain of two coolant loops are used because the primary coolant loop takes on shortterm radioactivity from the reactor. The ruv is a reactor coolant pump, specially designed for the westinghouse ap reactor. The ruv is a very compact, vertical pumpmotor unit, designed to fit into the compartment next to the reactor pressure vessel fig. The reactor pump which acts as a reactor coolant pump is a centrifugal pump, which circulates the coolant necessary to carry away the decay heat. A nuclear reactor coolant is a coolant in a nuclear reactor used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. The ruv is a very compact, vertical pump motor unit, designed to fit into the compartment next to the reactor pressure vessel fig. Flowserve develops the first canned pump prototype for modern nuclear power pumps. Pdf on nov 30, 2011, gerard van loenhout and others published improving reactor coolant pump seal reliability at dominion surry nuclear power station find, read and cite all the research you. Introduction in the design of pressurized water reactor pwr, the reactor coolant pump rcp is one of the important components in the nuclear steam supply system nsss. Si03, relating to the reactor coolant pump rcp, raised requiring the following.
However, the amount of expansion or contraction varies, depending on the material. Us20150050141a1 passive shutdown sealing device for a shaft. Nuclear power plants rely on cooling systems to ensure safe, continuous operation of the nuclear reactor. The function of a power reactor installation is to extract as much heat of nuclear fission as possible and convert it to useful power, generally electricity. Reactor coolant pumps rcps background westinghouse has designed, manufactured and refurbished hundreds of reactor coolant pumps rcps for the global market, allowing westinghouse to amass extensive experience and expertise in providing dependable rcps, for the continued success of its customers. Iris features an integral reactor vessel that contains all the major reactor coolant system components including the reactor core, the coolant pumps, the steam. Reactor coolant pump type ruv for westinghouse reactor ap. Outage planning support outage preparation pump and motor field services oneyear motor inspections fiveyear motor. Different designs of reactor pumps exist for the different.
This invention relates to a passive shutdown sealing device 20, 40 for a reactor coolant pump set comprising a set of bimetallic strips 21, 41 having a first position called the cold position when the temperature of said bimetallic strips is less than said temperature threshold, and a second position called the hot position when the temperature of said bimetallic strips is greater than. Abandoned application number us14370,311 inventor eric savin. The purpose of the nuclear reactor coolant pumps is to provide forced primary coolant flow to remove and transfer the amount of heat generated in. A special feature of this type of motor is that the flywheel is mounted directly on the shaft, thereby increasing the mass moment of inertia of the rotor. The reactor coolant pump is the only class 1 pump application in the pwr plant. The reactor coolant pump in each loop is a vertical, singlestage, shaftsealed centrifugal pump, driven by an aircooled, threephase induction motor. As an original equipment manufacturer oem, westinghouse maintains and has ready access to the original. Colloidal corrosion products which are referred to as crud are removed from nuclear reactor coolant streams by suspending zirconium oxide particles in the coolant stream. Diseconomy of scale worlds largest cannedmotor reactor. It is a hermetically sealed, wet winding motor pump. Reactor coolant pump seal issues and their applicability. Because of the large amount of heat generated in the reactor core by the fission reaction.
Rsr reactor coolant pump for pressurized water reactor. Us9273694b2 reactor coolant pump motor loadbearing. Reactor coolant pump type ruv for westinghouse reactor. Genericassessment of delayed reactorcoolant pump trip during. Seal inspection motor disconnects removal, then installation and reconnects seal disassembly, reassembly seal inspection upgraded parts installation motortopump alignment balancing.
State the purposes of the reactor coolant pump rcp. Today, 25 percent of the operating pwr1 and bwr reactors in the world use. Field services following is a brief synopsis of typical procedures performed during each of the identified field services. Extended study of reactor coolant pump coastdown phenomenon. Genericassessment of delayed reactorcoolant pump trip.
The bulletins also required that certain loca analyses be performed regarding delayed reactor coolant pump trip. Although the reactor coolant pumps do not produce high head, they operate at a suction pressure of approximately 2,500 psi. The first seal provides the major part of the pressure loss between the highpressure reactor system 15,5 mpa and the ambient pressure. Pump selection and application in a pressurized water reactor electric generating plant figure 4. Simulator, human machine interfaces, vver type reactor, reactor coolant pump, control rod bank 1.
The containment spray pumps function to condense the steam and reduce the gas concentration in the containment. The simulated results performed in the simulator through switching off one reactor coolant pump in comparisons with experiment results performed in vver. Psr reactor coolant pump for boiling water reactors high safety and structural integrity n selfcontained cooling and lubrication through integrated impeller and external cooler n hermetically sealed, no shaft seals n no leakage, sealless wet motor design n elimination of circulating pipes. Pdf improving reactor coolant pump seal reliability at. The pump is installed with a standstill seal that is capable of maintaining leaktightness of the pump shaft without requiring an active seal water injection system in case of pump trip. Westinghouse reactor coolant pump seal rcp technology is used by approximately 50% of the global nuclear fleet. Rcps generally contain mechanical seals to limit the leakage of pressurized reactor. The bwr is a direct cycle plantthe bwr is a direct cycle plant.
Optional seal configuration the cn pump is available with an alternative mechanical sealing system which incorporates a seal flush system. To provide the forced circulation of reactor coolant for the removal of core heat, 2. C relative humidity 0% to 100% seismic classification ieee 344 safety classification ieee 323 class 1e emirfi classification milstd461e per epri tr102323 environmental classification ieee 323. The palo verde engineers had detected this condition before the ecm software was installed, and had planned a replacement during the upcoming refueling outage. Us20150050141a1 passive shutdown sealing device for a. Nuclear power nuclear power plant reactor coolant pump. Reactor coolant article about reactor coolant by the free.
Reactor coolant pumps rcps are the most important rotating equipment in nuclear steam supply system of. The flow exiting the reactor coolant pump enters the discharge leg and returns to the reactor vessel through four inlet nozzles two per loop. Reactor coolant is at higher temp 557f and must be cooled by the thermal barrier heat exchanger. Psr reactor coolant pump for boiling water reactors our technology. The hot shop has been involved in reactor feed pump uprates, condensate and heater drain rebowls, reactor coolant pump remanufacturing and nuclear seal rebuilds.
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