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title="Réacteur A2W – French" lang="fr" hreflang="fr" data-title="Réacteur A2W" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Reaktor_A2W" title="Reaktor A2W – Indonesian" lang="id" hreflang="id" data-title="Reaktor A2W" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/A2W_(%E5%8E%9F%E5%AD%90%E7%82%89)" title="A2W (原子炉) – Japanese" lang="ja" hreflang="ja" data-title="A2W (原子炉)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/A2W_atomreaktor" 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data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/A2W_reactor" title="Special:EditPage/A2W reactor">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22A2W+reactor%22">"A2W reactor"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22A2W+reactor%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22A2W+reactor%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22A2W+reactor%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22A2W+reactor%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22A2W+reactor%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">September 2016</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>The <b>A2W reactor</b> is a <a href="/wiki/United_States_naval_reactors" title="United States naval reactors">naval nuclear reactor</a> used by the <a href="/wiki/United_States_Navy" title="United States Navy">United States Navy</a> to provide <a href="/wiki/Electricity_generation" title="Electricity generation">electricity generation</a> and <a href="/wiki/Nuclear_marine_propulsion" title="Nuclear marine propulsion">propulsion</a> on <a href="/wiki/Warship" title="Warship">warships</a>. The A2W designation stands for: </p> <ul><li>A = <a href="/wiki/Aircraft_carrier" title="Aircraft carrier">Aircraft carrier</a> platform</li> <li>2 = Second generation <a href="/wiki/Nuclear_reactor_core" title="Nuclear reactor core">core</a> designed by the contractor</li> <li>W = <a href="/wiki/Westinghouse_Electric_Company" title="Westinghouse Electric Company">Westinghouse</a> was the contracted designer</li></ul> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=A2W_reactor&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This <a href="/wiki/Nuclear_reactor" title="Nuclear reactor">nuclear reactor</a> was used in the world's first nuclear-powered aircraft carrier, the <a href="/wiki/USS_Enterprise_(CVN-65)" title="USS Enterprise (CVN-65)">USS <i>Enterprise</i> (CVN-65)</a>. The four propulsion plants on <i>Enterprise</i> each contained two reactors, numbered according to the shaft they powered, 1A-1B, 2A-2B, 3A-3B, and 4A-4B. Each propulsion plant was capable of operating on one reactor plant through most of the power range required to propel the ship at speeds in excess of 33 knots (60 km/h). Both reactors would have been on-line to simultaneously provide maximum ship speed and plane launching capability. </p> <div class="mw-heading mw-heading2"><h2 id="Design_and_operation">Design and operation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=A2W_reactor&action=edit&section=2" title="Edit section: Design and operation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The reactors are <a href="/wiki/Pressurized_water_reactor" title="Pressurized water reactor">pressurized water reactors</a> fueled by highly enriched <a href="/wiki/Uranium-235" title="Uranium-235">uranium-235</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Light water is used as both neutron-moderator and reactor coolant. <a href="/wiki/Hafnium" title="Hafnium">Hafnium</a> <a href="/wiki/Control_rod" title="Control rod">Control rods</a> are used to control the operation of the reactor. Extracting the rods to a calculated height allows the reactor to reach <a href="/wiki/Nuclear_chain_reaction" title="Nuclear chain reaction">criticality</a>, the point at which the <a href="/wiki/Nuclear_fission" title="Nuclear fission">nuclear fission</a> reactions reach a self-sustaining level. Thereafter, steam flow (from the steam generators) regulates reactor power as explained below. The control rods are "shimmed" in or out to regulate average coolant temperature or lowered to the bottom of the reactor vessel to shut the reactor down — either done in a slow controlled manner or dropped rapidly during what is called a <a href="/wiki/Scram" title="Scram">SCRAM</a> to immediately shut the reactor down in an emergency. </p><p>Much of the reactor power control during steady-state operation comes as a result of the coolant water's negative temperature coefficient. The power of the reactor is determined by the instantaneous rate of fission events that take place in the fuel. As the water heats up, it expands and becomes less dense, which provides fewer molecules per volume to moderate the <a href="/wiki/Neutron" title="Neutron">neutrons</a>, hence fewer neutrons are slowed to the required thermal energies to sustain thermal fission. Conversely, when the coolant water temperature decreases, its density increases and a greater number of neutrons reach the required thermal energy, increasing the number of fissions per unit of time, creating more heat. This has the effect of allowing "steam demand" to control reactor power, requiring little intervention by the Reactor Operator for changes in the power demanded by the ship's operations. </p><p>The hot water from the reactors is sent, via large pipes, into heat exchangers called steam generators. There the heat from the pressurized, superheated reactor coolant water is transferred, through tube walls, to water being fed into the steam generators from a separate feed system. Once the reactor coolant water has given off its heat in the steam generators, it is returned, via large electric pumps (four per reactor), to the reactors to repeat the cycle. </p><p>Saturated steam is channeled from each steam generator to a common header, where the steam is then sent to the main engine, electrical generators, aircraft catapult system, and various auxiliaries. There are two main propulsion turbines, one high pressure turbine and one low pressure turbine, with a moisture separator in place between the two. The Low Pressure main propulsion turbine is double-ended, whereby the steam enters at the center and divides into two streams as it enters the actual turbine wheels, expanding and giving up its energy as it does so, causing the turbine to spin at high speed. The main shaft enters a reduction gear in which the high rotational velocity of the turbine shaft is stepped down to a usable turn rate for propelling the ship. The expended steam from the main engine and other auxiliaries enters <a href="/wiki/Condenser_(heat_transfer)" title="Condenser (heat transfer)">condensers</a> to be cooled into liquid water and recycled to the feed system. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=A2W_reactor&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFChunyan_MaFrank_von_Hippel2001" class="citation web cs1">Chunyan Ma; Frank von Hippel (Spring 2001). <a rel="nofollow" class="external text" href="http://cns.miis.edu/npr/pdfs/81mahip.pdf">"Ending the Production of Highly Enriched Uranium for Naval Reactors"</a> <span class="cs1-format">(PDF)</span>. <i>The Nonproliferation Review</i>. p. 87<span class="reference-accessdate">. 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reactor">A1W</a></li> <li><a class="mw-selflink selflink">A2W</a></li> <li><a href="/wiki/A3W_reactor" title="A3W reactor">A3W</a></li> <li><a href="/wiki/A4W_reactor" title="A4W reactor">A4W</a></li> <li><a href="/wiki/A1B_reactor" title="A1B reactor">A1B</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background-color:#DCDCDC;color:inherit;">Cruiser</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/C1W_reactor" title="C1W reactor">C1W</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background-color:#DCDCDC;color:inherit;">Destroyer</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/D1G_reactor" title="D1G reactor">D1G</a></li> <li><a href="/wiki/D2G_reactor" title="D2G reactor">D2G</a></li></ul> </div></td></tr><tr><th 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href="/wiki/S2C_reactor" title="S2C reactor">S2C</a></li> <li><a href="/wiki/S5G_reactor" title="S5G reactor">S5G</a></li> <li><a href="/wiki/S6G_reactor" title="S6G reactor">S6G</a></li> <li><a href="/wiki/S6W_reactor" title="S6W reactor">S6W</a></li> <li><a href="/wiki/S7G_reactor" title="S7G reactor">S7G</a></li> <li><a href="/wiki/S8G_reactor" title="S8G reactor">S8G</a></li> <li><a href="/wiki/S9G_reactor" title="S9G reactor">S9G</a></li> <li><a href="/wiki/S1B_reactor" title="S1B reactor">S1B</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background-color:#DCDCDC;color:inherit;"><div><a href="/wiki/List_of_United_States_naval_reactors" title="List of United States naval reactors">List of United States naval reactors</a></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Westinghouse" style="padding:3px"><table class="nowraplinks mw-collapsible mw-collapsed navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="3"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Westinghouse" title="Template:Westinghouse"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Westinghouse" title="Template talk:Westinghouse"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Westinghouse" title="Special:EditPage/Template:Westinghouse"><abbr title="Edit this 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(1886–2000)</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Divisions</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Westinghouse_Advanced_Energy_Systems_Division" title="Westinghouse Advanced Energy Systems Division">Advanced Energy</a></li> <li><a href="/wiki/Westinghouse_Astronuclear_Laboratory" title="Westinghouse Astronuclear Laboratory">Astronuclear</a></li> <li><a href="/wiki/Westinghouse_Aviation_Gas_Turbine_Division" title="Westinghouse Aviation Gas Turbine Division">Aviation</a></li> <li><a href="/wiki/Baldwin-Westinghouse_electric_locomotives" class="mw-redirect" title="Baldwin-Westinghouse electric locomotives">Baldwin</a></li> <li><a href="/wiki/Westinghouse_Broadcasting" title="Westinghouse Broadcasting">Broadcasting</a></li> <li><a href="/wiki/Westinghouse_Combustion_Turbine_Systems_Division" title="Westinghouse Combustion Turbine Systems Division">Combustion Turbine</a></li> <li><a href="/wiki/New_England_Westinghouse_Company" title="New England Westinghouse Company">New England</a></li> <li><a href="/wiki/White-Westinghouse" title="White-Westinghouse">White-Westinghouse</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Subsidiaries</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/British_Westinghouse" title="British Westinghouse">British Westinghouse</a></li> <li><a href="/wiki/Bryant_Electric_Company" title="Bryant Electric Company">Bryant</a></li> <li><a href="/wiki/Infinity_Broadcasting_Corporation" title="Infinity Broadcasting Corporation">Infinity</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Successors</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CBS_Corporation" title="CBS Corporation">CBS Corporation</a></li> <li><a href="/wiki/Viacom_(1952%E2%80%932006)" class="mw-redirect" title="Viacom (1952–2006)">Viacom (1952–2006)</a></li> <li><a href="/wiki/Viacom_(2005%E2%80%932019)" title="Viacom (2005–2019)">Viacom (2005–2019)</a></li> <li><a href="/wiki/Paramount_Global" title="Paramount Global">Paramount Global</a></li> <li><a href="/wiki/Westinghouse_Electronics" title="Westinghouse Electronics">Westinghouse Electronics</a></li> <li><a href="/wiki/Westinghouse_Licensing_Corporation" title="Westinghouse Licensing Corporation">Westinghouse Licensing</a></li> <li><a href="/wiki/Westinghouse_Electric_Company" title="Westinghouse Electric Company">Westinghouse Electric Company</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Products</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">A2W reactor</a></li> <li><a href="/wiki/List_of_Westinghouse_locomotives" title="List of Westinghouse locomotives">Locomotives (list)</a></li> <li><a href="/wiki/S2W_reactor" title="S2W reactor">S2W reactor</a></li> <li><a href="/wiki/Transit_Expressway_Revenue_Line" title="Transit Expressway Revenue Line">Transit Expressway Revenue Line</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/George_Westinghouse" title="George Westinghouse">George Westinghouse</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related topics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Electrification_of_the_New_York,_New_Haven,_and_Hartford_Railroad" class="mw-redirect" title="Electrification of the New York, New Haven, and Hartford Railroad">Electrification of the New York, New Haven, and Hartford Railroad</a></li> <li><a href="/wiki/George_Westinghouse_Award_(ASEE)" title="George Westinghouse Award (ASEE)">George Westinghouse Award</a></li> <li><a href="/wiki/George_Westinghouse_Medal" title="George Westinghouse Medal">George Westinghouse Medal</a></li> <li><a href="/wiki/Regeneron_Science_Talent_Search" title="Regeneron Science Talent Search">Regeneron Science Talent Search</a></li> <li><a href="/wiki/Westinghouse_Air_Brake_Company_General_Office_Building" title="Westinghouse Air Brake Company General Office Building">Westinghouse Air Brake Building</a></li> <li><a href="/wiki/11_Stanwix_Street" title="11 Stanwix Street">Westinghouse Tower</a></li> <li><i><a href="/wiki/Westinghouse_Works,_1904" title="Westinghouse Works, 1904">Westinghouse Works, 1904</a></i></li></ul> </div></td></tr></tbody></table><div></div></td><td class="noviewer navbox-image" rowspan="2" style="width:1px;padding:0 0 0 2px"><div><span typeof="mw:File"><a href="/wiki/File:Westinghouse_Design_Mark.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/Westinghouse_Design_Mark.svg/70px-Westinghouse_Design_Mark.svg.png" decoding="async" width="70" height="70" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/50/Westinghouse_Design_Mark.svg/105px-Westinghouse_Design_Mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/50/Westinghouse_Design_Mark.svg/140px-Westinghouse_Design_Mark.svg.png 2x" data-file-width="620" data-file-height="620" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related 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