{"id":3557,"date":"2021-03-16T15:10:28","date_gmt":"2021-03-16T14:10:28","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=3557"},"modified":"2021-03-16T15:10:29","modified_gmt":"2021-03-16T14:10:29","slug":"il-y-a-dix-ans-a-tohoku","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2021\/03\/16\/il-y-a-dix-ans-a-tohoku\/","title":{"rendered":"Il y a dix ans \u00e0 Tohoku"},"content":{"rendered":"\n<p>Le 11 mars 2011, <a rel=\"noreferrer noopener\" href=\"https:\/\/fr.wikipedia.org\/wiki\/S%C3%A9isme_de_2011_de_la_c%C3%B4te_Pacifique_du_T%C5%8Dhoku\" target=\"_blank\">un tremblement de terre<\/a> de <a rel=\"noreferrer noopener\" href=\"https:\/\/fr.wikipedia.org\/wiki\/S%C3%A9isme#S%C3%A9ismes_les_plus_puissants_enregistr%C3%A9s_depuis_1900\" target=\"_blank\">magnitude 9,1<\/a> eut lieu \u00e0 130km \u00e0 l\u2019est du Japon, provoquant un tsunami ravageur&nbsp;: les vagues ont atteint jusqu\u2019\u00e0 30 m\u00e8tres de haut et ont parcouru jusqu\u2019\u00e0 10km \u00e0 l\u2019int\u00e9rieur des terres. Les cons\u00e9quences \u00e9conomiques sont \u00e9normes, tant en raison des destructions que des arr\u00eats provisoires de production&nbsp;: le PIB du Japon baisse de 13% en mars. On compte environ 18.500 morts ou disparus.<\/p>\n\n\n\n<p>Mais ce qui va attirer l\u2019attention internationale, c\u2019est le grave accident qui affecte 1, puis, 2, 3 ,4 r\u00e9acteurs sur le site de Fukushima. Alors justement, dix ans apr\u00e8s, avec le recul, on en sait un peu plus sur les cons\u00e9quences de cet accident et sur la mani\u00e8re dont il a \u00e9t\u00e9 trait\u00e9. Le but n\u2019\u00e9tant pas d\u2019\u00eatre exhaustif, on se contentera ici d\u2019\u00e9voquer les cons\u00e9quences sanitaires, en s\u2019appuyant notamment sur des rapports publi\u00e9s sur le sujet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les victimes de la radioactivit\u00e9<\/h2>\n\n\n\n<p>L<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Comit%C3%A9_scientifique_des_Nations_unies_pour_l%27%C3%A9tude_des_effets_des_rayonnements_ionisants\" target=\"_blank\" rel=\"noreferrer noopener\">\u2019UNSCEAR<\/a> est le comit\u00e9 scientifique des Nations unies pour l&rsquo;\u00e9tude des effets des rayonnements ionisants. Dans un rapport paru en 2013, il avait fait le constat que l\u2019accident de Fukushima n\u2019avait fait aucune victime directe du fait de la radioactivit\u00e9 et il faisait l\u2019hypoth\u00e8se qu\u2019il n\u2019y en aurait que tr\u00e8s peu dans les ann\u00e9es suivantes. Un nouveau rapport paru en 2020, et b\u00e9n\u00e9ficiant des constats et \u00e9tudes men\u00e9es depuis, arrive \u00e0 la conclusion qu\u2019il ne devrait y avoir aucun impact statistiquement significatif sur la sant\u00e9 des personnes de la r\u00e9gion, que ce soit sous la forme de cancers de la thyro\u00efde, du sang ou d\u2019autres parties du corps. On trouva par exemple dans le rapport la phrase de r\u00e9sum\u00e9 suivante&nbsp;: \u00ab&nbsp;les niveaux d&rsquo;exposition des membres du public ont \u00e9t\u00e9 trop faibles pour que le Comit\u00e9 puisse s&rsquo;attendre \u00e0 des augmentations perceptibles de l&rsquo;incidence du cancer du sein ou d&rsquo;autres cancers solides.&nbsp;\u00bb<\/p>\n\n\n\n<p>Si <em>Le Point<\/em> a <a href=\"https:\/\/www.lepoint.fr\/monde\/zero-mort-aucun-cancer-le-vrai-bilan-de-l-accident-nucleaire-de-fukushima-10-03-2021-2417139_24.php\" target=\"_blank\" rel=\"noreferrer noopener\">relay\u00e9<\/a> ce rapport, <em>France Info<\/em> a pr\u00e9f\u00e9r\u00e9 <a href=\"https:\/\/www.francetvinfo.fr\/monde\/japon\/fukushima\/fukushima-10-apres-il-y-a-une-contamination-chronique-perenne-tres-grave-pour-la-planete-affirme-un-journaliste_4329215.html\" target=\"_blank\" rel=\"noreferrer noopener\">donner la parole<\/a> \u00e0 un journaliste qui s\u2019est sp\u00e9cialis\u00e9 dans la d\u00e9nonciation du nucl\u00e9aire et a r\u00e9ussi \u00e0 sortir l\u2019\u00e9normit\u00e9 suivante&nbsp;: \u00ab<em>&nbsp;Comme le r\u00e9v\u00e8lent de nombreux scientifiques, ce sont les faibles doses qui sont les plus dangereuses.<\/em>&nbsp;\u00bb<\/p>\n\n\n\n<p>Sur LCI, la journaliste Abnousse Salmani a<a href=\"https:\/\/twitter.com\/24hPujadas\/status\/1370085257307885575\" target=\"_blank\" rel=\"noreferrer noopener\"> pr\u00e9sent\u00e9<\/a> avec clart\u00e9 le rapport de l\u2019UNSCEAR, sous l\u2019\u0153il goguenard d\u2019Apathie, qui n\u2019avait certainement pas boss\u00e9 le sujet&nbsp;!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les cons\u00e9quences de l\u2019\u00e9vacuation des populations<\/h2>\n\n\n\n<p>470&nbsp;000 personnes <a href=\"https:\/\/www.irsn.fr\/FR\/connaissances\/Installations_nucleaires\/Les-accidents-nucleaires\/accident-fukushima-2011\/fukushima-2016\/Pages\/4-consequences-sociales-evacues-accident-nucleaire-fukushima-2016.aspx?dId=a4c10d10-3eb2-4f22-abe4-f2e1390f8278&amp;dwId=e54a8fba-14b7-402c-b39c-a81eec4df160\" target=\"_blank\" rel=\"noreferrer noopener\">ont \u00e9t\u00e9 \u00e9vacu\u00e9es<\/a> \u00e0 la suite de la catastrophe, dont environ 160&nbsp;000 \u00e0 cause de la centrale nucl\u00e9aire (les autres \u00e0 cause du tsunami). 53&nbsp;000&nbsp;\u00e9taient toujours hors de chez eux en janvier&nbsp;2018 dont 4&nbsp;000 dans des b\u00e2timents pr\u00e9fabriqu\u00e9s temporaires. D\u2019apr\u00e8s <a href=\"https:\/\/www.liberation.fr\/checknews\/2019\/04\/20\/est-il-vrai-que-l-accident-nucleaire-de-fukushima-n-a-cause-aucun-mort_1720075\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u2019article<\/a> de <em>Lib\u00e9ration<\/em>, on comprend que 43&nbsp;214 de ces personnes toujours en dehors de chez elles sont li\u00e9es \u00e0 l\u2019accident nucl\u00e9aire.<\/p>\n\n\n\n<p>Le stress provoqu\u00e9, les mauvaises conditions d\u2019h\u00e9bergement ont \u00e9t\u00e9 la cause de morts pr\u00e9matur\u00e9es. &nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0957582017300782\" target=\"_blank\">Un article de recherche estime<\/a> \u00e0 environ 1600 le nombre de d\u00e9c\u00e8s attribuables \u00e0 l&rsquo;\u00e9vacuation. Les auteurs, qui ont examin\u00e9 aussi les cons\u00e9quences de Tchernobyl, estiment qu\u2019il y aurait eu beaucoup de d\u00e9c\u00e8s pr\u00e9matur\u00e9s si la population \u00e9tait rest\u00e9e sur place et concluent que la d\u00e9localisation doit \u00eatre utilis\u00e9e avec parcimonie, voire pas du tout, apr\u00e8s tout accident nucl\u00e9aire majeur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Retour au charbon&nbsp;: CO2 et poussi\u00e8res nocives<\/h2>\n\n\n\n<p>A la suite de l\u2019accident de Fukushima, plusieurs pays ont revu leur politique \u00e9nerg\u00e9tique. Par exemple, la Chine a stopp\u00e9 les constructions de nouveaux r\u00e9acteurs, mais les a reprises quelques ann\u00e9es plus tard, au vu des r\u00e9sultats des \u00e9tudes men\u00e9es sur l\u2019accident. Plus pr\u00e8s de nous, l\u2019Allemagne a d\u00e9cid\u00e9 de fermer ses centrales nucl\u00e9aires (selon un calendrier progressif). M\u00e9caniquement, ces d\u00e9cisions ont conduit dans les pays concern\u00e9s \u00e0 un plus grand recours au charbon ou \u00e0 d\u2019autres \u00e9nergies fossiles&nbsp;; donc \u00e0 de plus fortes \u00e9missions de gaz \u00e0 effet de serre et de poussi\u00e8res nocives, ces derni\u00e8res \u00e9tant <a href=\"https:\/\/www.lepoint.fr\/monde\/zero-mort-aucun-cancer-le-vrai-bilan-de-l-accident-nucleaire-de-fukushima-10-03-2021-2417139_24.php\" target=\"_blank\" rel=\"noreferrer noopener\">g\u00e9n\u00e9ratrices de mortalit\u00e9 suppl\u00e9mentaire.<\/a><\/p>\n\n\n\n<p>Deux chercheurs de l\u2019universit\u00e9 am\u00e9ricaine de Columbia, sp\u00e9cialis\u00e9s dans les questions climatiques, ont<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0301421519303611\" target=\"_blank\" rel=\"noreferrer noopener\"> \u00e9valu\u00e9 l\u2019impact<\/a> de ces diff\u00e9rentes d\u00e9cisions. Ils notent par exemple que l&rsquo;Allemagne aurait pu \u00e9viter, en conservant ouvertes ses centrales nucl\u00e9aires jusqu&rsquo;\u00e0 4600 d\u00e9c\u00e8s et 300 MtCO2 d&rsquo;\u00e9missions cumul\u00e9es entre 2011 et 2017. Et si le pays proc\u00e9dait \u00e0 l&rsquo;\u00e9limination totale du nucl\u00e9aire d&rsquo;ici 2022, il pourrait perdre la chance d&rsquo;\u00e9viter 16&nbsp;000 d\u00e9c\u00e8s et 1100 MtCO2 d&rsquo;\u00e9missions cumul\u00e9es par rapport \u00e0 un cas o\u00f9 sa production nucl\u00e9aire est rest\u00e9e stable \u00e0 la valeur de 2017 jusqu&rsquo;en 2035. Rappelons que les \u00e9missions annuelles de la France sont d\u2019environ 450 Mt CO2e par an. Les figures ci-dessous montrent les impacts des d\u00e9cisions d\u2019arr\u00eats du nucl\u00e9aire suite \u00e0 Fukushima pour diff\u00e9rentes r\u00e9gions du globe :<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"580\" height=\"193\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/03\/Impacts-des-arr\u00eats-du-nucl\u00e9aire-en-2011.png\" alt=\"\" class=\"wp-image-3558\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/03\/Impacts-des-arr\u00eats-du-nucl\u00e9aire-en-2011.png 580w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2021\/03\/Impacts-des-arr\u00eats-du-nucl\u00e9aire-en-2011-300x100.png 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Quelques mots sur les doses<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.futura-sciences.com\/sciences\/dossiers\/physique-radioactivite-phenomene-physique-1-3-761\/page\/8\/\" target=\"_blank\" rel=\"noreferrer noopener\">On mesure<\/a> les doses de radioactivit\u00e9 re\u00e7ues par les humains en millisievert (mSv). Les \u00e9tudes r\u00e9alis\u00e9es apr\u00e8s les deux bombes largu\u00e9es sur le Japon ont montr\u00e9 une relation lin\u00e9aire entre les doses re\u00e7ues et la probabilit\u00e9 d\u2019en mourir&nbsp;: on est ainsi \u00e0 100 % de d\u00e9c\u00e8s pour 5 Sievert (5000 mSv), et \u00e0 10 % pour 500 mSv. Aucun impact n\u2019a pu \u00eatre mis en \u00e9vidence en dessous de 100 mSv. Il existe d\u2019ailleurs quelques r\u00e9gions du globe (en Inde et au bord de la mer Caspienne) o\u00f9 la radioactivit\u00e9 naturelle peut d\u00e9passer localement ces 10mSv, sans qu\u2019on ait pu observer des cons\u00e9quences sur la sant\u00e9.<\/p>\n\n\n\n<p>Un Fran\u00e7ais re\u00e7oit chaque ann\u00e9e en moyenne une dose totale de 3,6 mSv, dont 65 % d\u2019origine naturelle, 33% dans le cadre de la m\u00e9decine, 1% du fait de l\u2019industrie non nucl\u00e9aire, 0,3 % du fait des retomb\u00e9es des essais militaires et 0,1% du fait de l\u2019industrie nucl\u00e9aire.<\/p>\n\n\n\n<p>&nbsp;<em>La r\u00e9glementation fran\u00e7aise fixe \u00e0 1 millisievert (mSv) par an la dose efficace maximale admissible r\u00e9sultant des activit\u00e9s humaines en dehors de la radioactivit\u00e9 naturelle et des doses re\u00e7ues en m\u00e9decine.<\/em><\/p>\n\n\n\n<p><em>Pour les personnes qui travaillent avec des radiations ionisantes, la limite est de 100 mSv pour un ensemble de 5 ann\u00e9es cons\u00e9cutives, le maximum recommand\u00e9 par la r\u00e8glementation internationale pour une ann\u00e9e \u00e9tant de 50 mSv<\/em>. <a href=\"https:\/\/www.laradioactivite.com\/site\/pages\/LimitesDoses.htm\" target=\"_blank\" rel=\"noreferrer noopener\">La r\u00e8glementation fran\u00e7aise<\/a> <em>impose une limite plus stricte de 20 mSv\/an pour l&rsquo;exposition des personnes travaillant r\u00e9guli\u00e8rement en zone r\u00e9glement\u00e9e (cat\u00e9gorie A). A titre comparatif, la dose re\u00e7ue par un patient soumis \u00e0 un scanner de l&rsquo;abdomen est de 17 mSv. Si l\u2019on appliquait la limite de 1 mSv \u00e0 toutes les causes, on ne pourrait pas subir un scanner, il faudrait renoncer \u00e0 l&rsquo;avion, abandonner l&rsquo;alpinisme, ne pas habiter la Bretagne ou la Corse.<\/em><\/p>\n\n\n\n<p><em>Dans le cas d\u2019accidents nucl\u00e9aires, des niveaux d\u2019intervention exprim\u00e9s en termes de doses servent de rep\u00e8res aux pouvoirs publics pour d\u00e9cider, au cas par cas, des actions \u00e0 d\u00e9clencher :<br>\u2013 la mise \u00e0 l\u2019abri, si la dose efficace pr\u00e9visionnelle d\u00e9passe 10 mSv ;<br>\u2013 l\u2019\u00e9vacuation, si la dose efficace pr\u00e9visionnelle d\u00e9passe 50 mSv ;<br>\u2013 l\u2019administration d\u2019iode stable, lorsque la dose \u00e0 la thyro\u00efde risque de d\u00e9passer 100 mSv.<\/em><\/p>\n\n\n\n<p>A Fukushima, la limite choisie pour l\u2019\u00e9vacuation a \u00e9t\u00e9 de 20 mSv<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Un peu d\u2019exactitude, svp&nbsp;!<\/h2>\n\n\n\n<p>On a maintenant compris que pour faire les bons choix en mati\u00e8re de r\u00e9chauffement climatique, il fallait tenir compte de l\u2019ensemble du cycle de vie. Ce qui pr\u00e9c\u00e8de montre qu\u2019il en est de m\u00eame quand on veut \u00e9valuer les cons\u00e9quences sanitaires d\u2019un accident ou de d\u00e9cisions, et que ce n\u2019est pas simple&nbsp;! Le nucl\u00e9aire est un bouc \u00e9missaire facile, accus\u00e9 de bien des maux dont il n\u2019est pas responsable, et bien rarement soutenu pour les bouts de solution que, bon an mal an, il peut apporter.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le 11 mars 2011, un tremblement de terre de magnitude 9,1 eut lieu \u00e0 130km \u00e0 l\u2019est du Japon, provoquant un tsunami ravageur&nbsp;: les vagues ont atteint jusqu\u2019\u00e0 30 m\u00e8tres de haut et ont parcouru jusqu\u2019\u00e0 10km \u00e0 l\u2019int\u00e9rieur des terres. Les cons\u00e9quences \u00e9conomiques sont \u00e9normes, tant en raison des&#8230;<\/p>\n","protected":false},"author":11,"featured_media":3562,"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-3557","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>Il y a dix ans \u00e0 Tohoku - 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\/03\/16\/il-y-a-dix-ans-a-tohoku\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Il y a dix ans \u00e0 Tohoku - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Le 11 mars 2011, un tremblement de terre de magnitude 9,1 eut lieu \u00e0 130km \u00e0 l\u2019est du Japon, provoquant un tsunami ravageur&nbsp;: les vagues ont atteint jusqu\u2019\u00e0 30 m\u00e8tres de haut et ont parcouru jusqu\u2019\u00e0 10km \u00e0 l\u2019int\u00e9rieur des terres. 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