The shell sections, flange, and nozzles are manufactured as forgings. The ap sup r plant is an 1100mwe class pressurized water reactor with passive safety features and extensive plant simplifications that enhance construction, operation, maintenance, safety and costs. The ap reactor is an advanced reactor design with enhanced passive safety and improved operational performance that builds on decades of westinghouses experience with pwr design. Surfaces, which can become wetted during operation and refuelling, are clad with stainless steel welded overlay. Design acceptance confirmation issued in march 2017. The major design improvements incorporated in the reactor vessel design include. Npp is the ap that is a pressurized water reactor pwr type that has received the final.
The steam generators sgs although large are also conventional utube types. Transmittal of westinghouse response to us nrc requests for. Nrc approved and certified the ap design under 10 cfr part 52 in december. Ap, passive, advantage abstract the distinguishing features of westinghouses ap advanced passive pressurized water reactor are highlighted. Reactor design the ap reactor coolant pump motors are rated on the less dense hot water at operating temperature in lieu of although different from each other, the core, reactor the more dense ambient temperature water for the ap600. The ap reactor is a pressurised water reactor pwr designed and sold by westinghouse electric company, now majority owned by toshiba. The saps require that reactor chemistry on a nuclear power plant be identified and considered in safety assessments.
Several important enhancements, all based on existing technology, have been used to improve the performance characteristics of the design. An attempt to build the first nuclear power plant in a generation has moved forward now that the nuclear regulatory commission says plans to build new reactors meet safety requirements. Many reactor safety simulation codes for nuclear power plants npps have been developed. The reactor vessel is the same as that for a standard westinghouse threeloop plant.
Like ap600, the ap is a twoloop, pressurized water reactor featuring passive core cooling and passive containment safety systems. Design of the ap power reactor bernd doehnert westinghouse electric belgium key words. For ap s nuclear and secondary steam supply system, despite numerous evolutionary improvements, it is similar to the conventional pwrs. With a gross power rating of 3,415 megawatt thermal mwt and a. The general design and technology innovations of cap1400. The ap tm is a twoloop pressurized water reactor pwr that uses a simplified, innovative and effective approach to safety. The ap design is considerably more compact in land usage than most existing pwrs, and uses under a fifth of the concrete and rebar reinforcing of older designs. Performance analysis of ap passive systems during direct. Nuclear regulatory commission nrc issued the final design certification rule dcr for the advanced passive ap design in the federal register 71 fr 4464. Plant design life of 60 years without replacement of the reactor vessel. However, it is very important to evaluate these codes by testing different accident scenarios in actual plant conditions. Ap nuclear power plant design westinghouse nuclear.
This enabled minimization of risks, and calculation of the overall safety of the plant. Ansys engineering simulation for reactor design including cfd for chemical reactor design, structural and thermal analysis and instrumentation and control software used for design and analysis of chemical reactors enable reaction engineers to answer whatif questions as they design and enhance reactors performance, energy usage, reactor yield. Synopsis the comprehensive vibration assessment program. Design of the ap power reactor warsaw university of. With a gross power rating of 3,415 megawatt thermal mwt and a nominal net electrical output of 1,110 megawatt electric mwe, the ap reactor, with a 157fuelassembly core, is ideal for new. In the westinghouse ap plant, the effort for a strong optimization of the vessel internals, in order to reduce their cost and improve their reliability, addresses neutron economy, material property changes resulting from neutron exposure and mechanical design. There are currently a number of applications for combined construction and operating licenses in the us for ap. Features such as an integrated reactor vessel head package for quicker removal. The ap has evolved from earlier westinghouse electric company llc pwr designs. China nuclear reactor delayed again on safety concerns.
Based on nearly 20 years of research and development, the ap plant builds and improves upon the established. 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. A bittersweet milestone for the worlds safest nuclear. Reactor coolant system and connected systems design control document epsgwgl700 5. Reactor vessel is a modified threeloop westinghouse reactor vessel. The reactor vessel is composed of a vertically mounted cylindrical vessel with a hemispherical lower head welded to the vessel and a removable hemispherical closure head. Plant design life is 60 years without replacement of the reactor vessel. Design and fabri cation of the reactor v essel is carried out in accordance with asme code, section iii, class 1 re quirements. Simulation and analysis of small break loca for ap using.
Conventional reactors rely on defenceindepth made up of layers of redundancy and diversity this is where, say, two valves are fitted instead of one. The established design of the ap plant offers three distinct advantages. Nuclear power plants harness energy produced in a nuclear reactor to generate power through traditional steam generation. Nugen preparing to apply for a nuclear site licence to build and operate three ap reactors at moorside in cumbria. But unlike other pwr designs it is what is called an. The ap is an uprated version of the ap600 passive plant design that recently received final design certification from the us nrc.
The advanced passive ap is a nuclear pressurized water reactor pwr originally designed by westinghouse electric company. The westinghouse ap nuclear power plant is the safest and most reliable. Now two ap reactors in commercial operation, vogtle makes. Technical specifications design control document epsgwgl700 16. The design characteristics of advanced power reactor 1400. The ap reactor vessel design pressure and temperature is 2500 psia 17. Reactor vessel internals vibration testing rxst1p502 a2. The pressurized water reactor cap1400 is one of the sixteen national science and technology major projects.
The aps ascent in china began in 2004 when the government launched a rigorous twoyear evaluation aimed at selecting an advanced western reactor design that would underpin its future. Reactor ap design control document tier 2 material 4. Probabilistic risk assessment was used in the design of the plants. A bittersweet milestone for the worlds safest nuclear reactors. 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 reactor vessel and internals, steam generator, fuel and pressurizer designs are improved versions of those found in currently operating westinghouse. Four ap plants are already under construction in china two at sanmen and two at haiyang. Ap plants pressurized water reactor by westinghouse. The pads rest on st eel base pads atop a support structure, which is a ttached to th e concrete foundation wall. Aug 29, 2015 reactor coolant pumps for ap still a problem august 29, 2015 by rod adams 27 comments this is a story that i really dont want to tell, but bad news is like old fish. Synopsis the comprehensive vibration assessment program cvap for ap reactor internals.
Reactor vessels simplification was a major design objective for the ap plant. The adequacy of the ap core support structures is demonstrated by. Ultimately, the goal of assessment is to reach an independent and informed judgment on the adequacy of safety in the generic design. As a safety enhancement, there are no reactor vessel penetrations below the top of the core. The reactor vessel surveillance program incorporates eight specimen capsules. The capsules are located in guide baskets welded to the outside of the core barrel. Ap containment design and safety assessment conference. In particular, the aps passive safety features are described as. In reactor analysis, small break loss of coolant accident sbloca is an important safety issue.
The internals are also standardized, with minor modifications. The ap nuclear power plant is a twoloop pressurized water reactor pwr that uses a simplified, innovative and effective approach to safety. While the ap schedule slid, cnnc and cgn raced to certify their own competing enhancedsafety design. Mar 30, 2017 the ap nuclear reactor, designed by westinghouse, is suitable for construction in the uk regulators give design acceptance to the ap power station design gov.
Relap5mv visualized modularization software is recognized as one of the best estimate. The ap design uses passive features to mitigate design basis accidents. In march 2017, the first cap1400 reactor pressure vessel passed pressure tests. The simplified plant design includes overall safety systems, normal operating systems, the control room, construction techniques, and instrumentation and control systems. Ap reactor internals historical precedent although the ap reactor internals are classified as prototype due to various firstofakind foak design features, the majority of the ap reactor internals design is similar to existing plants that have been safely operating for many years. It is named after a former alabama power and southern company board chairman, alvin vogtle. Generic design assessment westinghouse ap gda step 3.
The ap is a nuclear power plant designed and sold by westinghouse electric company. 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. Performance analysis of ap passive systems during direct vessel injection dvi line break. The paper presents the core design, model development and results of the neutron transport simulations of the large pressurized water reactor based on the ap design. The reactor primary coolant has two steam generators with four coolant pumps 2x4 configuration. Fuel loading at the ap nuclear reactor in china has been delayed due to safety concerns, the latest in a long line of setbacks for the project. Ap is usnrc design certified and us advanced light water reactor utility requirement compliant. Unit 4 top head for containment vessel in place at vogtle. Vogtle electric generating plant, also known as plant vogtle. Pctrans right hand side control panels are similar to a conventional pwr.
The core, reactor vessel, and reactor internals of the ap are similar to those of conventional westinghouse pwr designs. These facilities are part of larger industrial sites that combine civil, building, transmission, and power generation infrastructure. Westinghouse ap internals heating rate distribution. Apsup r nuclear power plant safety overview for spent. Dec 18, 2017 this is reflected in the high design fuel burn up 60gwdton the reactor pressure vessel rpv is conventional in design, but is intended to use advanced metallurgical techniques very low copper and nickel content to avoid embrittlement at high neutron exposures. The design of the ap reactor vessel internals is based on the ap600, westinghouse standard 3xl, and other previously licensed westinghouse plants, and is structurally very similar to those designs.