{"id":47388,"date":"2019-11-04T06:21:51","date_gmt":"2019-11-04T05:21:51","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-sodio-e-nak-reator-coolant-definicao\/"},"modified":"2020-01-23T13:00:08","modified_gmt":"2020-01-23T12:00:08","slug":"o-que-e-sodio-e-nak-reator-coolant-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-sodio-e-nak-reator-coolant-definicao\/","title":{"rendered":"O que \u00e9 s\u00f3dio e NaK &#8211; Reator Coolant &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Reatores r\u00e1pidos resfriados a s\u00f3dio (SFRs) s\u00e3o o projeto de reator r\u00e1pido mais comum.\u00a0Eles usam s\u00f3dio fundido ou uma liga eut\u00e9tica de s\u00f3dio e pot\u00e1ssio (NaK) como fluido de refrigera\u00e7\u00e3o do reator.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>S\u00f3dio e NaK &#8211; L\u00edquido refrigerante do reator<\/h2>\n<p><strong>Reatores r\u00e1pidos resfriados a s\u00f3dio<\/strong>\u00a0(SFRs) s\u00e3o o projeto de reator r\u00e1pido mais comum.\u00a0Eles usam s\u00f3dio fundido ou uma liga eut\u00e9tica de s\u00f3dio e pot\u00e1ssio (NaK) como fluido de refrigera\u00e7\u00e3o do reator.\u00a0Os pontos de fus\u00e3o e ebuli\u00e7\u00e3o do s\u00f3dio e NaK s\u00e3o:<\/p>\n<ul>\n<li>\n<figure id=\"attachment_20594\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-20594\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sodium-potassium-alloy-eutectic.png\"><img loading=\"lazy\" class=\"size-medium wp-image-20594 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sodium-potassium-alloy-eutectic-300x202.png\" alt=\"liga de s\u00f3dio-pot\u00e1ssio - eut\u00e9tica\" width=\"300\" height=\"202\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sodium-potassium-alloy-eutectic-300x202.png\" \/><\/a><figcaption id=\"caption-attachment-20594\" class=\"wp-caption-text\">Fonte: wikipedia.org Licen\u00e7a: Dom\u00ednio p\u00fablico<\/figcaption><\/figure>\n<p><strong>s\u00f3dio<\/strong><\/p>\n<ul>\n<li>ponto de fus\u00e3o &#8211; 97,72 \u00b0 C<\/li>\n<li>ponto de ebuli\u00e7\u00e3o &#8211; 883 \u00b0 C<\/li>\n<\/ul>\n<\/li>\n<li><strong>NaK<\/strong>\u00a0&#8211; mistura eut\u00e9tica\n<ul>\n<li>ponto de fus\u00e3o &#8211; (-12 \u00b0 C)<\/li>\n<li>ponto de ebuli\u00e7\u00e3o &#8211; 785 \u00b0 C<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<figure id=\"attachment_263\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-263\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sodium-Cooled_Fast_Reactor.png\"><img loading=\"lazy\" class=\"size-medium wp-image-263 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sodium-Cooled_Fast_Reactor-300x214.png\" alt=\"Reator r\u00e1pido resfriado a s\u00f3dio (SFR).\" width=\"300\" height=\"214\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Sodium-Cooled_Fast_Reactor-300x214.png\" \/><\/a><figcaption id=\"caption-attachment-263\" class=\"wp-caption-text\">Reator r\u00e1pido resfriado a s\u00f3dio (SFR).<br \/>\nFonte: wikipedia.org<\/figcaption><\/figure>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><span>NaK contendo 40% a 90% de pot\u00e1ssio em peso \u00e9 l\u00edquido \u00e0 temperatura ambiente.\u00a0A mistura eut\u00e9tica consiste em 77% de pot\u00e1ssio e 23% de s\u00f3dio.\u00a0<\/span><strong><span>O s\u00f3dio<\/span><\/strong><span>\u00a0e o\u00a0<\/span><strong><span>NaK<\/span><\/strong><span>\u00a0n\u00e3o corroem o a\u00e7o em grau significativo e s\u00e3o compat\u00edveis com muitos combust\u00edveis nucleares, permitindo uma ampla variedade de materiais estruturais.\u00a0Como o s\u00f3dio reage violentamente com a \u00e1gua, no entanto, os\u00a0<\/span><strong><span>SFRs<\/span><\/strong><span>\u00a0exigem a coloca\u00e7\u00e3o de um trocador de calor intermedi\u00e1rio entre o\u00a0<\/span><a title=\"N\u00facleo do reator\" href=\"https:\/\/www.reactor-physics.com\/what-is-reactor-core-definition\/\"><span>n\u00facleo<\/span><\/a><span>\u00a0do\u00a0<a title=\"Reactor Core\" href=\"https:\/\/www.reactor-physics.com\/what-is-reactor-core-definition\/\">reator<\/a>\u00a0e o\u00a0<\/span><a title=\"Gerador de vapor\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\"><span>gerador de vapor<\/span><\/a><span>\u00a0.\u00a0Essa tecnologia de alta tecnologia requer muita experi\u00eancia; portanto, poucos pa\u00edses desenvolveram seu pr\u00f3prio projeto de reator r\u00e1pido.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Propriedades dos metais l\u00edquidos<\/span><\/h2>\n<p><strong><span>Propriedades dos metais l\u00edquidos<\/span><\/strong><\/p>\n<p><span>Na f\u00edsica,\u00a0<\/span><strong><span>o metal l\u00edquido<\/span><\/strong><span>\u00a0consiste em ligas com pontos de fus\u00e3o muito baixos, que formam um l\u00edquido eut\u00e9tico \u00e0 temperatura ambiente.\u00a0Na engenharia de reatores,\u00a0<\/span><strong><span>metais l\u00edquidos<\/span><\/strong><span>\u00a0s\u00e3o ligas com baixo ponto de fus\u00e3o, permitindo que o l\u00edquido de arrefecimento do reator seja l\u00edquido na faixa operacional de temperaturas (geralmente acima da temperatura ambiente).<\/span><\/p>\n<figure id=\"attachment_13563\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-13563\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-vs-fast-reactor-neutron-spectrum-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-13563 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-vs-fast-reactor-neutron-spectrum-min-300x300.png\" alt=\"espectro de n\u00eautrons de reator t\u00e9rmico vs. r\u00e1pido\" width=\"300\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/thermal-vs-fast-reactor-neutron-spectrum-min-300x300.png\" \/><\/a><figcaption id=\"caption-attachment-13563\" class=\"wp-caption-text\"><span>O espectro de energias de n\u00eautrons produzidas pela fiss\u00e3o varia significativamente com o design de certos reatores.\u00a0espectro de n\u00eautrons de reator t\u00e9rmico vs. r\u00e1pido<\/span><\/figcaption><\/figure>\n<p><strong><span>Os metais l\u00edquidos<\/span><\/strong><span>\u00a0podem ser usados \u200b\u200bcomo fluido de refrigera\u00e7\u00e3o do reator, porque possuem excelentes propriedades de transfer\u00eancia de calor e podem ser empregados em sistemas de baixa press\u00e3o, como \u00e9 o caso dos\u00a0<\/span><strong><span>reatores r\u00e1pidos resfriados a s\u00f3dio<\/span><\/strong><span>\u00a0(SFRs).\u00a0A caracter\u00edstica \u00fanica dos metais no que diz respeito \u00e0 sua estrutura \u00e9 a presen\u00e7a de portadores de carga,\u00a0<\/span><strong><span>el\u00e9trons<\/span><\/strong><span>\u00a0especificamente\u00a0<strong>livres,<\/strong>\u00a0proporcionando\u00a0<\/span><strong><span>alta condutividade el\u00e9trica<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>alta\u00a0<\/span><a title=\"Condutividade t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condutividade-termica-definicao\/\"><span>condutividade t\u00e9rmica<\/span><\/a><\/strong><span>\u00a0.\u00a0O uso de refrigerantes de metal l\u00edquido tornou poss\u00edvel proporcionar alta taxa de\u00a0<\/span><a title=\"Transfer\u00eancia de calor\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-transferencia-de-calor-definicao\/\"><span>transfer\u00eancia<\/span><\/a><span>\u00a0de\u00a0<a title=\"Transfer\u00eancia de calor\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-transferencia-de-calor-definicao\/\">calor<\/a>\u00a0em usinas de energia, bem como as temperaturas das superf\u00edcies de trabalho de suas constru\u00e7\u00f5es pr\u00f3ximas \u00e0 temperatura do refrigerante.<\/span><\/p>\n<p><span>Al\u00e9m disso,\u00a0<\/span><strong><span>os metais l\u00edquidos<\/span><\/strong><span>\u00a0utilizados na engenharia de reatores s\u00e3o absorvedores muito fracos de\u00a0<\/span><a title=\"N\u00eautron\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/\"><span>n\u00eautrons,<\/span><\/a><span>\u00a0permitindo que os reatores de metais l\u00edquidos operem com espectro r\u00e1pido de n\u00eautrons.\u00a0Um reator r\u00e1pido de metal l\u00edquido \u00e9 um reator de alta densidade de pot\u00eancia, que n\u00e3o precisa de\u00a0<\/span><a title=\"Moderador de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/neutron-moderator\/\"><span>moderador de n\u00eautrons<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><span>As principais diferen\u00e7as entre reatores t\u00e9rmicos e r\u00e1pidos s\u00e3o, obviamente, em\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/neutron-cross-section\/\"><strong><span>se\u00e7\u00f5es transversais de n\u00eautrons<\/span><\/strong><\/a><span>\u00a0, que exibem\u00a0<\/span><strong><span>depend\u00eancia energ\u00e9tica<\/span><\/strong><span>\u00a0significativa\u00a0.\u00a0Pode ser caracterizada pela\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/capture-to-fission-ratio\/\"><strong><span>raz\u00e3o de captura \/ fiss\u00e3o<\/span><\/strong><\/a><span>\u00a0, que \u00e9\u00a0<\/span><strong><span>menor nos reatores r\u00e1pidos<\/span><\/strong><span>\u00a0.\u00a0H\u00e1 tamb\u00e9m uma diferen\u00e7a no\u00a0<\/span><strong><span>n\u00famero de n\u00eautrons produzidos por uma fiss\u00e3o<\/span><\/strong><span>\u00a0, que \u00e9 maior nos reatores r\u00e1pidos do que nos reatores t\u00e9rmicos.\u00a0Essas diferen\u00e7as muito importantes s\u00e3o causadas principalmente por\u00a0<\/span><strong><span>diferen\u00e7as nos fluxos de n\u00eautrons<\/span><\/strong><span>\u00a0.\u00a0Portanto, \u00e9 muito importante conhecer a distribui\u00e7\u00e3o detalhada de energia de n\u00eautrons no n\u00facleo de um reator.<\/span><\/p>\n<p><span>A desvantagem de muitos metais l\u00edquidos tamb\u00e9m \u00e9 sua alta atividade qu\u00edmica na intera\u00e7\u00e3o com oxig\u00eanio, \u00e1gua e materiais estruturais, que podem causar deteriora\u00e7\u00e3o da transfer\u00eancia de calor na planta sob certas condi\u00e7\u00f5es.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>N\u00famero de Nusselt para reatores de metais l\u00edquidos<\/span><\/h2>\n<p><span>Um\u00a0<\/span><strong><span>reator refrigerado a metal l\u00edquido<\/span><\/strong><span>\u00a0\u00e9 um tipo avan\u00e7ado de\u00a0<\/span><a title=\"Reator nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\"><span>reator nuclear,<\/span><\/a><span>\u00a0onde o refrigerante prim\u00e1rio \u00e9 um metal l\u00edquido. \u00a0<\/span><strong><span>Os metais l\u00edquidos<\/span><\/strong><span>\u00a0podem ser usados \u200b\u200bcomo refrigerante, pois possuem excelentes propriedades de transfer\u00eancia de calor e podem ser empregados em sistemas de baixa press\u00e3o, como \u00e9 o caso dos\u00a0<\/span><strong><span>reatores r\u00e1pidos resfriados a s\u00f3dio<\/span><\/strong><span>\u00a0(SFRs).\u00a0A caracter\u00edstica \u00fanica dos metais no que diz respeito \u00e0 sua estrutura \u00e9 a presen\u00e7a de portadores de carga,\u00a0<\/span><strong><span>el\u00e9trons<\/span><\/strong><span>\u00a0especificamente\u00a0<strong>livres,<\/strong>\u00a0proporcionando\u00a0<\/span><strong><span>alta condutividade el\u00e9trica<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>alta condutividade t\u00e9rmica<\/span><\/strong><span>\u00a0.\u00a0Essa condutividade t\u00e9rmica muito alta, juntamente com causas de baixa viscosidade, correla\u00e7\u00f5es t\u00edpicas de transfer\u00eancia de calor (por exemplo,\u00a0<\/span><a title=\"Equa\u00e7\u00e3o de Dittus-Boelter\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/dittus-boelter-equation\/\"><span>Dittus-Boelter<\/span><\/a><span>) n\u00e3o pode ser usado.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\"><span>Para\u00a0<\/span><strong><span>metais l\u00edquidos,<\/span><\/strong><span>\u00a0o\u00a0<\/span><a title=\"O que \u00e9 o n\u00famero Prandtl\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-prandtl-number\/\"><strong><span>n\u00famero de Prandtl<\/span><\/strong>\u00a0<\/a><span>\u00e9 muito pequeno, geralmente na faixa de\u00a0<\/span><strong><span>0,01 a 0,001.\u00a0<\/span><\/strong><span>Isso significa que a\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-difusividade-termica-definicao\/\"><strong><span>difusividade t\u00e9rmica<\/span><\/strong><\/a><span>\u00a0, que est\u00e1 relacionada \u00e0 taxa de\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-conducao-termica-conducao-termica-definicao\/\"><strong><span>transfer\u00eancia<\/span><\/strong><\/a><span>\u00a0de\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-conducao-termica-conducao-termica-definicao\/\"><strong>calor por condu\u00e7\u00e3o<\/strong><\/a>\u00a0,\u00a0<\/span><strong><span>domina<\/span><\/strong><span>\u00a0sem ambiguidade\u00a0.\u00a0Essa difusividade t\u00e9rmica muito alta resulta da condutividade t\u00e9rmica muito alta dos metais, que \u00e9 cerca de 100 vezes maior que a da \u00e1gua.\u00a0O\u00a0<\/span><strong><span>n\u00famero de Prandtl<\/span><\/strong><span>\u00a0para s\u00f3dio a uma temperatura de opera\u00e7\u00e3o t\u00edpica nos reatores r\u00e1pidos resfriados a s\u00f3dio \u00e9 de cerca de 0,004.\u00a0Nesse caso, o desenvolvimento da camada limite t\u00e9rmica \u00e9 muito mais r\u00e1pido que o da camada limite de velocidade (\u03b4\u00a0<\/span><sub><span>t<\/span><\/sub><span>\u00a0&gt;&gt; \u03b4), e \u00e9 razo\u00e1vel assumir velocidade uniforme ao longo da camada limite t\u00e9rmica.<\/span><span>Os coeficientes de transfer\u00eancia de calor para o fluxo de s\u00f3dio atrav\u00e9s do canal de combust\u00edvel s\u00e3o baseados no\u00a0<\/span><strong><span>n\u00famero de Prandtl<\/span><\/strong><span>\u00a0e no\u00a0<\/span><strong><a title=\"O que \u00e9 o n\u00famero P\u00e9clet\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-peclet-number\/\"><span>n\u00famero de P\u00e9clet<\/span><\/a><span>\u00a0.\u00a0<\/span><\/strong><span>A inclina\u00e7\u00e3o do di\u00e2metro (P \/ D) tamb\u00e9m faz muitos c\u00e1lculos de transfer\u00eancia de calor em reatores de metais l\u00edquidos.\u00a0<\/span><strong><span>As correla\u00e7\u00f5es convectivas de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0s\u00e3o geralmente apresentadas em termos de\u00a0<\/span><strong><span>n\u00famero<\/span><\/strong><span>\u00a0de\u00a0<strong>Nusselt versus n\u00famero de P\u00e9clet<\/strong>\u00a0.\u00a0O n\u00famero t\u00edpico de p\u00e9clet para opera\u00e7\u00e3o normal \u00e9 de 150 a 300 nos pacotes de combust\u00edvel.\u00a0Quanto a outros regimes de fluxo, o n\u00famero de Nusselt e uma determinada correla\u00e7\u00e3o podem ser usados \u200b\u200bpara determinar o coeficiente de transfer\u00eancia de calor por convec\u00e7\u00e3o.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Correla\u00e7\u00e3o Graber-Rieger<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-Graber-Rieger.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20600 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-Graber-Rieger.png\" alt=\"N\u00famero Nusselt - Metal l\u00edquido - Graber-Rieger\" width=\"566\" height=\"412\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-Graber-Rieger.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Correla\u00e7\u00e3o FFTF<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-FFTF.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20601 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-FFTF.png\" alt=\"N\u00famero Nusselt - Metal l\u00edquido - FFTF\" width=\"479\" height=\"342\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Nusselt-number-Liquid-Metal-FFTF.png\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Reatores r\u00e1pidos resfriados a s\u00f3dio (SFRs) s\u00e3o o projeto de reator r\u00e1pido mais comum.\u00a0Eles usam s\u00f3dio fundido ou uma liga eut\u00e9tica de s\u00f3dio e pot\u00e1ssio (NaK) como fluido de refrigera\u00e7\u00e3o do reator.\u00a0Engenharia T\u00e9rmica S\u00f3dio e NaK &#8211; L\u00edquido refrigerante do reator Reatores r\u00e1pidos resfriados a s\u00f3dio\u00a0(SFRs) s\u00e3o o projeto de reator r\u00e1pido mais comum.\u00a0Eles usam &#8230; <a title=\"O que \u00e9 s\u00f3dio e NaK &#8211; Reator Coolant &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-sodio-e-nak-reator-coolant-definicao\/\" aria-label=\"More on O que \u00e9 s\u00f3dio e NaK &#8211; Reator Coolant &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 s\u00f3dio e NaK - Reator Coolant - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Reatores r\u00e1pidos resfriados a s\u00f3dio (SFRs) s\u00e3o o projeto de reator r\u00e1pido mais comum. 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