Generic design assessment ap nuclear power plant design by. Passive safety systems and timeline for station blackout. The ap tm is a twoloop pressurized water reactor pwr that uses a simplified, innovative and effective approach to safety. To obtain a free viewer for displaying this format, see our plugins, viewers, and other tools. Proceedings of icapp 03 cordoba, spain, may 47, 2003 paper 3235 westinghouse ap advanced passive plant w. Thermal compensation the yoke rod design, together with proper selection of yoke rod and spindle materials, renders the valve relatively free from changes in pressure settings due to inlet temperature variations. Operation and maintenance manual air power pack models ap, apq ap 1025 conroy place, easton pa 18040 u. Table 11 sheet 1 of 7 ap plant comparison with other facilities systemcomponent ap watts bar san onofre v. Therefore, i have awarded a design acceptance confirmation dac, which marks the closure of gda and means that the reactor design is suitable for construction on. China begins construction of worlds first ap reactor. Sep 22, 2018 the ap nuclear reactor design executive summary the ap advanced passive nuclear reactor design has a weaker containment, and fewer backup safety systems than current reactor designs. Operation and maintenance manual air power pack models ap, ap q ap 1025 conroy place, easton pa 18040 u. Vogtle coowners vote to continue ap construction project.
The ap nuclear reactor design executive summary the ap advanced passive nuclear reactor design has a weaker containment, and fewer backup safety systems than current reactor designs. The ap is a twoloop pressurized water reactor pwr with passive safety features and extensive plant simplifications that enhance its. Surfaces, which can become wetted during operation and refuelling, are clad with stainless steel welded overlay. In a unanimous vote crucial to the future of the only nuclear power plant construction project in the united states, all four coowners of the two westinghouse ap nuclear reactors being built at georgia powers vogtle site in waynesboro, georgia, agreed this week to continue the project. A bittersweet milestone for the worlds safest nuclear. Summer overall plant design life years 60 40 a 40a 40a nsss power mwt 3,415 3,475 3,410 2,912. United states nuclear regulatory commission, the ap pressurized water reactor pwr. Heart of reactor system each plant site includes two reactors 4 rcps per reactor 8 rcps per plant site rcps pump primary coolant through the reactor core the rcp provides a life of the plant solution canned motor rcps improve reliability ap reactor core ap reactor coolant pump the rcp is in the heart of the. This is all clearly documented in published guidance on our website. With a gross power rating of 3,415 megawatt thermal mwt and a. Westinghouse ap technical report office for nuclear. Design of the ap power reactor warsaw university of. The advanced passive ap is a nuclear pressurized water reactor pwr originally designed by westinghouse electric company.
This report is the first of our public statements for the ap reactor designed by. For aps nuclear and secondary steam supply system, despite numerous evolutionary improvements, it is similar to the conventional pwrs. The saps require that reactor chemistry on a nuclear power plant be identified and considered in safety assessments. Upon nrc rulemaking approval of its amendment to the ap design, an start printed page 10270 applicant seeking an nrc license to construct and operate a nuclear power reactor using the ap design need not demonstrate in its application the safety of the certified design. Westinghouse ap the westinghouse ap is different from a conventional pwr that requires active pumps for reactor core and containment cooling. Federal register ap standard technical specifications. The ap reactor vessel design pressure and temperature is 2500 psia 17. Reactor coolant system and connected systems ap design control document tier 2 material 5.
The ap advanced passive nuclear reactor design has a weaker containment, and fewer backup safety systems. The westinghouse ap pressurized water reactor pwr is the most advanced commercially available nuclear power plant. The ap is a nuclear power plant designed and sold by westinghouse. Pctrans right hand side control panels are similar to a conventional pwr. Reactivity coefficient calculation for ap reactor using the nodal3 code article pdf available in journal of physics conference series 9621. Roger hannah senior public affairs officer region ii.
Processing of radioactive materials in the ap reactor. Ap nuclear street nuclear power plant news, jobs, and. Moorside cumbria ap nuclear reactor design by radiation. Reactor ap design control document chapter 4 reactor. The following links on this page are to adobe portable document format pdf files. To begin the description, let us first see the configuration of the ap reactor primary coolant system shown in figure 4. Pdf analysis on neutronic parameters of the ap reactor core.
The westinghouse advanced passive pwr ap is an 1100 mwe. Abstract the ap is a twoloop, mwe pressurized water reactor pwr with passive. The plant is a pressurized water reactor with improved use of passive nuclear safety. It belongs in the same class of reactors as the areva epr but with a net electrical power of 1100mw compared to 1600 mw of the epr. A bittersweet milestone for the worlds safest nuclear reactors. The fukushima accident, in 2011, seemed to further cement the aps status as the preferred reactor for the future, with its emphasis on passive safety. For both, the reactor vessel is the same as that for a standard. The ap design traces its history to two previous designs, the ap600 and the system 80 the system 80 design was created by combustion engineering and featured a twoloop cooling system with a single steam generator paired with two reactor coolant pumps in each loop that makes it simpler and less expensive than systems which pair a single reactor coolant pump with a steam generator in each.
The first ap was expected to start operations in 2017 in china at the sanmen nuclear power station. Aps flawed design two new reactor designs were forecast at least in europe and northamerica make the nuclear renaissance happen. Federal register ap design certification amendment. Westinghouse electric company llc ap nuclear reactor. Ml11171a303 westinghouse ap design control document rev. Ap nuclear power plant design by westinghouse electric. Soluble boron free pwr with the bigt absorbers the model sbf pwr was based on westinghouses ap core 3,400 mwth reactor power for 490 effective full power days efpds 4. The ap is a pressurized water reactor pwr moderated and cooled by light normal water using enriched uranium fuel. Pdf the paper presents the core design, model development and results of the neutron transport simulations of the large pressurized. The ap is a nuclear power plant designed and sold by westinghouse electric company. The advanced pwr uses passive heat sink and natures force to remove decay heat after reactor shutdown.
The fuel rods consist of enriched uranium, in the form of cylindrical pellets of uran ium dioxide. Simplification was a major design objective for the ap. Apr 07, 2010 by design, the ap containment has an even higher vulnerability to corrosion than containment systems of current reactor designs because the outside of the ap containment is subject to a highoxygen and highmoisture environment conducive to corrosion and is prone to collect moisture in numerous inaccessible. Ap reactor plans in india world nuclear news reported on june 2 that six ap reactors planned for the mithi virdi plant in the bhavnagar district of indias northern gujarat state will now be constructed at the kovvada site in the southern state of andhra pradesh. This feature is part of the ap severe accident strategy to retain core debris inside the reactor. Westinghouse ap reactor design office for nuclear regulation.
Reactor ap design control document tier 2 material 4. This report does not contain information on the gda process1, its background and development2 or the regulatory process and legal basis of our work. The ap nuclear reactors proposed for moorside in cumbria. The control rod system provides both manual and automatic control systems for. By design, the ap containment has an even higher vulnerability to corrosion than containment systems of current reactor designs because the outside of the ap containment is subject to a highoxygen and highmoisture environment conducive to corrosion and is prone to collect moisture in numerous inaccessible. Soda for the ap, despite the fact that just a few days earlier westinghouse had declared itself bankrupt. The eprdesign, is as we all know, under heavy fire, and now also from the french nuclear regulator see next article.
Ap is a pwr reactors type with passive safety and large electric power output, which is mw electric. Conventional reactors rely on defenceindepth made up of layers of redundancy and diversity this is where, say, two valves are fitted instead of one. High ambient temperatures adjacent to the valve spring and yoke rods may cause. Three new reactors are planned for the moorside site next to europes biggest nuclear complex at sellafield, writes peter roche, with a combined capacity of 3. Condition i normal operation and operational transients condition ii events of moderate frequency condition iii infrequent incidents. Reactor design although different from each other, the core, reactor vessel, and internals of both the ap600 and ap are essentially those of conventional westinghouse pwrs. The primary circuit of the ap reactor retains most of the general design features of current designs, with. With the ap, westinghouse sought to design a reactor that operated using conventional pressurized water reactor principles, while incorporating novel safety measures in order to increase reliability and costcompetiveness relative to competing reactor plants. In this paper, as per the plant design requirements, ap control systems were simulated, and plant thermalhydraulic performance analysis have been performed with relap5 thermalhydraulic computer code under five typical operational transients, i. The reactor primary coolant has two steam generators with four coolant pumps 2x4 configuration.
Both the original ap design and the modified design with the replacement of uranium dioxide fuel pellets with fcm fuel compacts are modeled and simulated for comparison. Ap reactor projects in the us, the uk and india wise. Sep 27, 2018 in a unanimous vote crucial to the future of the only nuclear power plant construction project in the united states, all four coowners of the two westinghouse ap nuclear reactors being built at georgia powers vogtle site in waynesboro, georgia, agreed this week to continue the project. The widely used monte carlo code mcnp is employed to perform the full core analysis at the beginning of cycle boc. It is an evolutionary improvement on the ap600, essentially a more powerful model with roughly the same footprint a design objective was to be less expensive to build than other generation iii reactor designs, by both using existing technology, and needing less equipment.
The primary circuit of the ap reactor retains most of the general. Control room operational at first ap nuclear plant. We are content that westinghouse has made sufficient progress against each of the gda is sues to complete this phase of regulatory assessment. In november 2016, radiation free lakeland issued a report on the ap reactor design which draws mainly on the work of the us based fairewinds associates, and raises some serious concerns about the safety of the reactor design. Structural design and modular construction approach for. The ap plant safetyrelated passive systems and equipment are sufficient to automatically establish and maintain core cooling and containment integrity indefinitely following designbasis events, assuming the most limiting single failure, with no operator action, and no onsite or offsite ac power sources. Based on nearly 25 years of research and development, the ap plant builds and improves upon the established technology of major components used in current westinghousedesigned plants. Hse priced and free publications are available by mail order from hse books, po box. Ultimately, the goal of assessment is to reach an independent and informed judgment on the adequacy of safety in the generic design. The conditions under which limiting power shapes are assumed to occur are chosen conservatively with regard to any permissible operating state. The plant is a pressurized water reactor with improved use of passive nuclear safety and many design features intended to lower its capital cost and improve its economics the design traces its history to the successful system 80 design, which was produced in various locations around the world. The ap is a nuclear power plant designed and sold by westinghouse electric company, now majority owned by toshiba.
The steam generators provide highquality steam to the turbine. The ap fuel assembly design also includes a protective grid for enhanced debris resistance. An additional level of defense is provided through. The advancedpassive safety systems on the ap pwr provide an unmatched level of defenseindepth. Ukpgwgl732 revision 2 explains the design of the reactor safety systems as part of the process of seeking approval for construction in the uk. But a new report for radiation free lakeland shows that the chosen ap reactor design, for all its claimed advanced passive safety features, is not fit for purpose and should be rejected as unsafe by uk regulators. The ap diverse reactor trip actuation system is independent of the reactor. Et, to start a free trial, get pricing information, order a reprint, or post an. The plant is a pressurised water reactor pwr with improved use of passive nuclear safety. The applicant for this amendment to the ap certified design is. Pdf reactivity coefficient calculation for ap reactor.
The ap nuclear reactor design executive summary the ap advanced passive nuclear reactor design has a weaker containment, and fewer. Ap reactor design is dangerous and not fit for purpose. Passive safety related systems the ap plant safety. By contrast, the ap passive core cooling system uses staged reservoirs of borated water that are designed to discharge into the reactor vessel at various threshold state points of the primary system. The team used this3d plantmodel to estimate the inventories of key structural materials steel and concrete needed to construct the mk1 pbfhr building and to develand assess op modular a construction approach using the same methods and module manufacturing infrastructure as the ap. The design has fewer valves and pumps than previous pwrs and allows cooling without intervention for up to 72 hours, relying mostly on natural processes such as water flowing downhill and heat rising. Package ml11171a500 westinghouse ap design control. Westinghouse overview and ap plant projects update. As a safety enhancement, there are no reactor vessel penetrations below the top of the core. The week is divided into detailed overviews of the following functional areas. Consolidated ap 3707s edition of nuclear 3700 series. Westinghouse electric company once again sets a new industry standard with the ap reactor.
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