{"id":4799,"date":"2021-10-18T09:40:47","date_gmt":"2021-10-18T07:40:47","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=4799"},"modified":"2021-10-18T09:40:48","modified_gmt":"2021-10-18T07:40:48","slug":"une-energie-concentree","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/","title":{"rendered":"Une \u00e9nergie concentr\u00e9e"},"content":{"rendered":"\n<p>La fission de 1 gramme d\u2019uranium 235 produit autant de chaleur que la combustion de 1,6 tonne de fuel ou de 2,8 tonnes de charbon. L\u2019\u00e9nergie lib\u00e9rable par l\u2019uranium est extr\u00eamement concentr\u00e9e, parce qu\u2019elle r\u00e9sulte d\u2019une transformation de l\u2019atome (fission) et non d\u2019une transformation chimique. Cette caract\u00e9ristique a de nombreuses cons\u00e9quences sur l\u2019impact des productions d\u2019\u00e9lectricit\u00e9 selon les ph\u00e9nom\u00e8nes utilis\u00e9s.<\/p>\n\n\n\n<p>Il faut cependant rappeler que le combustible utilis\u00e9 dans les r\u00e9acteurs nucl\u00e9aires ne contient qu\u2019un peu plus de 2% d\u2019uranium 235, le reste \u00e9tant de l\u2019uranium 238, non fissile. Le rapport de masse entre le combustible introduit dans une centrale \u00e0 charbon ou \u00e0 gaz et celui d\u2019un r\u00e9acteur nucl\u00e9aire n\u2019est donc pas de 1&nbsp;000&nbsp;000 \u00e0 1, mais plut\u00f4t de 10&nbsp;000 \u00e0 1. Ce qui reste encore \u00e9norme&nbsp;!<\/p>\n\n\n\n<p>Cela a des cons\u00e9quences sur la place occup\u00e9e par les outils de production, sur les volumes de stocks de produits ou sur les volumes de d\u00e9chets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les outils de production<\/h2>\n\n\n\n<p>Sur les outils de production, il n\u2019y a pas de grande diff\u00e9rence entre une centrale \u00e0 charbon et un r\u00e9acteur nucl\u00e9aire. Certes, la centrale va voir passer un volume consid\u00e9rable de charbon dans une seule journ\u00e9e, mais justement, il ne fait que passer&nbsp;!<\/p>\n\n\n\n<p>Si on compare le nucl\u00e9aire et l\u2019\u00e9olien, on a pu calculer qu\u2019\u00e0 production \u00e9gale, le premier consomme <a href=\"https:\/\/doseequivalentbanana.home.blog\/2019\/06\/18\/tout-ce-beton-tout-cet-acier-pour-construire-un-reacteur-nucleaire\/\" target=\"_blank\" rel=\"noreferrer noopener\">environ 10 fois moins de b\u00e9ton et d\u2019acier<\/a>. L\u2019emprise au sol de l\u2019\u00e9olien est nettement plus importante, et c\u2019est encore plus vrai pour le solaire (d\u2019o\u00f9 le conseil de l\u2019installer sur les toits).<\/p>\n\n\n\n<p>La toute neuve <a href=\"https:\/\/www.uniper.energy\/de\/datteln-4\" target=\"_blank\" rel=\"noreferrer noopener\">centrale de charbon de Dattelsn4<\/a>, consomme environ 3 millions de tonnes de charbon, \u00e0 comparer aux 100 tonnes de combustibles pr\u00e9sents pour 4 ans dans un r\u00e9acteur nucl\u00e9aire de puissance comparable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les stocks<\/h2>\n\n\n\n<p>La France poss\u00e8de une capacit\u00e9 de <a href=\"https:\/\/gaz-tarif-reglemente.fr\/gaz\/comprendre-gaz-naturel\/la-chaine-gaziere\/stockage-gaz.html\" target=\"_blank\" rel=\"noreferrer noopener\">stockage de gaz naturel<\/a> de 11,7 milliards de m\u00e8tres cubes (imaginez un cube de 2500 m\u00e8tres de c\u00f4t\u00e9), \u00e0 comparer \u00e0 une consommation annuelle d\u2019environ 40 milliards de m\u00e8tres cubes. Ces stocks qui repr\u00e9sentent 30 % de la consommation annuelle sont indispensables pour faire face \u00e0 une <a href=\"http:\/\/dev-gasinfocus.lateos.com\/wp-content\/uploads\/2013\/03\/USAGES_FR_8.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">consommation extr\u00eamement saisonni\u00e8re<\/a>\u00a0: celle-ci est 5 fois plus \u00e9lev\u00e9e l\u2019hiver que l\u2019\u00e9t\u00e9.<\/p>\n\n\n\n<p>La loi fran\u00e7aise oblige les p\u00e9troliers \u00e0 conserver un <a href=\"https:\/\/fr.wikipedia.org\/wiki\/R%C3%A9serve_strat%C3%A9gique_de_p%C3%A9trole#France\" target=\"_blank\" rel=\"noreferrer noopener\">stock dit strat\u00e9gique <\/a>de carburant (30% de la <a href=\"https:\/\/www.insee.fr\/fr\/statistiques\/2119673\" target=\"_blank\" rel=\"noreferrer noopener\">consommation annuelle<\/a>, qui est de 40 millions de tonnes environ, hors carburant avion). Celui-ci est dispers\u00e9 sur environ 280 lieux de stockage sur toute la France.<\/p>\n\n\n\n<p>EDF poss\u00e8de <a href=\"https:\/\/new.sfen.org\/vos-questions\/en-france-les-ressources-en-uranium-sont-elles-suffisantes-pour-assurer-notre-independance-energetique\/\" target=\"_blank\" rel=\"noreferrer noopener\">un stock d\u2019uranium<\/a> correspondant \u00e0 2 ans de production \u00e9lectrique. Il existe aussi un stock d\u2019uranium appauvri qui permettrait, si besoin, de faire face \u00e0 5 ans de consommation. La France importe chaque ann\u00e9e environ 8000 tonnes d\u2019uranium qui donnent environ 1000 tonnes d\u2019uranium enrichi et 7000 tonnes d\u2019uranium appauvri. Ces 1000 tonnes correspondent \u00e0 environ 50 m3, soit l\u2019\u00e9quivalent d\u2019un cube de moins de 4 m\u00e8tres de c\u00f4t\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les d\u00e9chets<\/h2>\n\n\n\n<p>Les principaux d\u00e9chets de la combustion des hydrocarbures, vapeur d\u2019eau et CO2, sont dispers\u00e9s dans l\u2019atmosph\u00e8re, avec les cons\u00e9quences que l\u2019on conna\u00eet. La France \u00e9met plus de 400 millions de tonnes de CO2 par an. Il y a bien s\u00fbr d\u2019autres d\u00e9chets, notamment soufr\u00e9s et nitr\u00e9s, que l\u2019on retrouve aussi dans l\u2019atmosph\u00e8re. En 1990, la combustion dans les transports rejetait encore environ 4000 tonnes de plomb par an. Ce volume a beaucoup diminu\u00e9 avec la suppression des additifs en plomb dans l\u2019essence&nbsp;: elle n\u2019est plus que de 60 tonnes par an.<\/p>\n\n\n\n<p>Le cas du charbon est un peu diff\u00e9rent, puisqu\u2019au-del\u00e0 des \u00e9missions de gaz, il reste des d\u00e9chets solides (cendres). La combustion des 3 millions de tonnes de Dattels4 donne probablement de l\u2019ordre du million de tonnes de cendres. Ces cendres sont aujourd\u2019hui principalement utilis\u00e9es pour remblayer les mines \u00e0 ciel ouvert, mais on conna\u00eet les terrils dans les anciens bassins miniers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu\u2019en est-il du nucl\u00e9aire&nbsp;?<\/h2>\n\n\n\n<p>L\u2019<a href=\"https:\/\/www.andra.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">Andra<\/a> (Agence nationale pour la gestion des d\u00e9chets radioactifs) tient \u00e0 jour une <a href=\"https:\/\/inventaire.andra.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">comptabilit\u00e9 rigoureuse<\/a> des<a href=\"https:\/\/www.sfen.org\/rgn\/dechets-radioactifs-verite-faits-exactitude-chiffres\" target=\"_blank\" rel=\"noreferrer noopener\"> stocks de d\u00e9chets radioactifs<\/a>. A fin 2019, il y avait environ 1\u00a0670\u00a0000 m3(un cube de 120 m\u00e8tres de c\u00f4t\u00e9) de <a href=\"https:\/\/inventaire.andra.fr\/sites\/default\/files\/documents\/pdf\/fr\/andra_essentiels_2021_in_web.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">d\u00e9chets radioactifs de toutes natures<\/a>. Ces d\u00e9chets sont class\u00e9s \u00e0 partir de deux crit\u00e8res\u00a0: leur activit\u00e9 plus ou moins forte et leur dur\u00e9e de vie.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"450\" height=\"296\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/D\u00e9chets-nucl\u00e9aire-inventaire.png\" alt=\"\" class=\"wp-image-4801\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/D\u00e9chets-nucl\u00e9aire-inventaire.png 450w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/D\u00e9chets-nucl\u00e9aire-inventaire-300x197.png 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/figure>\n\n\n\n<p>Les d\u00e9chets de haute activit\u00e9 (HA)et les d\u00e9chets de moyenne activit\u00e9 \u00e0 vie longue (MA-VL) repr\u00e9sentent respectivement 94,9% et 4,9 % de la radioactivit\u00e9. Ils sont destin\u00e9s \u00e0 \u00eatre entrepos\u00e9s en profondeur (projet Cigeo). Notons que les d\u00e9chets HA repr\u00e9sentent un volume correspondant \u00e0 un cube de 16 m\u00e8tres de cot\u00e9<\/p>\n\n\n\n<p>Comme on le voit, le caract\u00e8re tr\u00e8s concentr\u00e9 de l\u2019\u00e9nergie nucl\u00e9aire a des avantages pratiques \u00e9vidents&nbsp;: moins de surface au sol occup\u00e9e, moins de mat\u00e9riaux pour construire, possibilit\u00e9 d\u2019avoir beaucoup plus de stocks de combustible, volume de d\u00e9chets faible\u2026<\/p>\n\n\n\n<p>La puissance de la fission nucl\u00e9aire a eu une contrepartie historique\u00a0: <a href=\"https:\/\/www.musee-armee.fr\/fileadmin\/user_upload\/Documents\/Support-Visite-Fiches-Objets\/Fiches-1939-1945\/MA_fiche-objet-bombe-atomique_01.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">la bombe d\u2019Hiroshima<\/a> ne contenait que 64 kg d\u2019uranium (235), mais sa puissance \u00e9tait \u00e9quivalente \u00e0 celle de 22.000 tonnes de dynamite.<\/p>\n\n\n\n<p>Le nucl\u00e9aire civil n\u2019utilise pas un uranium enrichi \u00e0 100 % comme le nucl\u00e9aire militaire. Mais l\u2019utilisation de ce combustible demande des pr\u00e9cautions extr\u00eamement importantes du fait de sa radioactivit\u00e9. C\u2019est un sujet que nous traiterons dans un prochain article sur ce th\u00e8me.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La fission de 1 gramme d\u2019uranium 235 produit autant de chaleur que la combustion de 1,6 tonne de fuel ou de 2,8 tonnes de charbon. L\u2019\u00e9nergie lib\u00e9rable par l\u2019uranium est extr\u00eamement concentr\u00e9e, parce qu\u2019elle r\u00e9sulte d\u2019une transformation de l\u2019atome (fission) et non d\u2019une transformation chimique. Cette caract\u00e9ristique a de nombreuses&#8230;<\/p>\n","protected":false},"author":11,"featured_media":4803,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[53],"tags":[],"class_list":["post-4799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyses","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Une \u00e9nergie concentr\u00e9e - La Gazette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une \u00e9nergie concentr\u00e9e - La Gazette\" \/>\n<meta property=\"og:description\" content=\"La fission de 1 gramme d\u2019uranium 235 produit autant de chaleur que la combustion de 1,6 tonne de fuel ou de 2,8 tonnes de charbon. L\u2019\u00e9nergie lib\u00e9rable par l\u2019uranium est extr\u00eamement concentr\u00e9e, parce qu\u2019elle r\u00e9sulte d\u2019une transformation de l\u2019atome (fission) et non d\u2019une transformation chimique. Cette caract\u00e9ristique a de nombreuses&#8230;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\" \/>\n<meta property=\"og:site_name\" content=\"La Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2021-10-18T07:40:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-10-18T07:40:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/Nucl\u00e9aire-220_F_127452391_gzHr8B9uExRwIqZ12QVONy5qsGRBfHfB.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"220\" \/>\n\t<meta property=\"og:image:height\" content=\"147\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"G\u00e9rard Bardier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"G\u00e9rard Bardier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\"},\"author\":{\"name\":\"G\u00e9rard Bardier\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/#\/schema\/person\/5650e206a121f68c6f5e76379bccfbc4\"},\"headline\":\"Une \u00e9nergie concentr\u00e9e\",\"datePublished\":\"2021-10-18T07:40:47+00:00\",\"dateModified\":\"2021-10-18T07:40:48+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\"},\"wordCount\":935,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/10\/Nucl\u00e9aire-220_F_127452391_gzHr8B9uExRwIqZ12QVONy5qsGRBfHfB.jpg\",\"articleSection\":[\"Analyses\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\",\"url\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/10\/18\/une-energie-concentree\/\",\"name\":\"Une \u00e9nergie concentr\u00e9e - 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L\u2019\u00e9nergie lib\u00e9rable par l\u2019uranium est extr\u00eamement concentr\u00e9e, parce qu\u2019elle r\u00e9sulte d\u2019une transformation de l\u2019atome (fission) et non d\u2019une transformation chimique. 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