{"id":15496,"date":"2020-01-09T12:04:59","date_gmt":"2020-01-09T12:04:59","guid":{"rendered":"https:\/\/www.radiation-dosimetry.org\/quest-ce-que-linstrumentation-nucleaire-definition\/"},"modified":"2020-07-12T15:45:40","modified_gmt":"2020-07-12T15:45:40","slug":"quest-ce-que-linstrumentation-nucleaire-definition","status":"publish","type":"post","link":"http:\/\/www.radiation-dosimetry.org\/fr\/quest-ce-que-linstrumentation-nucleaire-definition\/","title":{"rendered":"Qu&rsquo;est-ce que l&rsquo;instrumentation nucl\u00e9aire &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-u-clearfix su-u-trim\">Les instrumentations nucl\u00e9aires sont g\u00e9n\u00e9ralement class\u00e9es en: Instrumentation nucl\u00e9aire Excore et Instrumentation nucl\u00e9aire Incore.\u00a0Les deux syst\u00e8mes sont bas\u00e9s sur la d\u00e9tection de neutrons.\u00a0Dosim\u00e9trie des rayonnements<\/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<p>Dans\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\">les r\u00e9acteurs nucl\u00e9aires<\/a>\u00a0, la puissance thermique produite par les fissions nucl\u00e9aires est proportionnelle au niveau du flux neutronique.\u00a0Par cons\u00e9quent, du point de vue de la s\u00e9curit\u00e9 du r\u00e9acteur, il est de la plus haute importance de mesurer et de contr\u00f4ler\u00a0<strong>le flux de neutrons et la distribution spatiale du flux de neutrons<\/strong>\u00a0dans le r\u00e9acteur\u00a0<strong>correctement<\/strong>\u00a0et par une instrumentation appropri\u00e9e.\u00a0A cet effet, diverses instrumentations nucl\u00e9aires sont install\u00e9es.\u00a0Ces mesures sont g\u00e9n\u00e9ralement effectu\u00e9es \u00e0 l&rsquo;ext\u00e9rieur du c\u0153ur du r\u00e9acteur, mais il existe \u00e9galement des mesures effectu\u00e9es \u00e0 l&rsquo;int\u00e9rieur du c\u0153ur.\u00a0Par cons\u00e9quent, les instrumentations nucl\u00e9aires sont g\u00e9n\u00e9ralement class\u00e9es comme:<\/p>\n<ul>\n<li>\n<ul>\n<li><strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/excore-nuclear-instrumentation\/\">Excore Nuclear Instrumentation<\/a>\u00a0.\u00a0<\/strong>Le flux neutronique est g\u00e9n\u00e9ralement mesur\u00e9 par<strong>\u00a0des d\u00e9tecteurs de neutrons excore<\/strong>\u00a0install\u00e9s \u00e0 l&rsquo;ext\u00e9rieur du c\u0153ur.\u00a0Ces d\u00e9tecteurs appartiennent \u00e0 ce qu&rsquo;on appelle le<strong>\u00a0syst\u00e8me d&rsquo;instrumentation nucl\u00e9aire d&rsquo;Excore (NIS)<\/strong>\u00a0.\u00a0\u00c9tant donn\u00e9 que le flux neutronique couvre une large plage (environ 12 d\u00e9cennies), trois plages d&rsquo;instrumentation sont utilis\u00e9es pour obtenir des mesures pr\u00e9cises du niveau de flux:\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/excore-nuclear-instrumentation\/source-range-detectors\/\"><strong>D\u00e9tecteurs de plage source<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/excore-nuclear-instrumentation\/intermediate-range-detectors\/\"><strong>D\u00e9tecteurs \u00e0 port\u00e9e interm\u00e9diaire<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/excore-nuclear-instrumentation\/power-range-detectors\/\"><strong>D\u00e9tecteurs de plage de puissance<\/strong><\/a><\/li>\n<\/ul>\n<\/li>\n<li><strong><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/incore-nuclear-instrumentation\/\">Incore Nuclear Instrumentation<\/a>\u00a0.\u00a0<\/strong>Le syst\u00e8me d&rsquo;instrumentation nucl\u00e9aire incore mesure la distribution du flux neutronique et les temp\u00e9ratures dans le c\u0153ur du r\u00e9acteur.\u00a0Le syst\u00e8me d&rsquo;instrumentation incore a pour but de fournir des informations d\u00e9taill\u00e9es sur la distribution du flux neutronique et les temp\u00e9ratures de sortie des assemblages combustibles \u00e0 certains emplacements du c\u0153ur.\u00a0Le syst\u00e8me d&rsquo;instrumentation incore comprend:\n<ul>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/incore-nuclear-instrumentation\/incore-neutron-flux-monitoring-system\/\"><strong>Syst\u00e8me de surveillance du flux de neutrons Incore<\/strong><\/a><\/li>\n<li><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/nuclear-instrumentation\/incore-nuclear-instrumentation\/incore-temperature-monitoring-system\/\"><strong>Syst\u00e8me de surveillance de la temp\u00e9rature Incore<\/strong><\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Les deux syst\u00e8mes sont bas\u00e9s sur la d\u00e9tection de neutrons.\u00a0Le flux neutronique est g\u00e9n\u00e9ralement mesur\u00e9 par\u00a0<strong>des d\u00e9tecteurs de neutrons excore<\/strong>\u00a0install\u00e9s \u00e0 l&rsquo;ext\u00e9rieur du c\u0153ur.\u00a0Ces d\u00e9tecteurs appartiennent \u00e0 ce qu&rsquo;on appelle le\u00a0<strong>syst\u00e8me d&rsquo;instrumentation nucl\u00e9aire d&rsquo;Excore (NIS)<\/strong>\u00a0.\u00a0Le\u00a0<strong>flux de neutrons<\/strong>\u00a0et sa\u00a0<strong>distribution<\/strong>\u00a0dans le c\u0153ur sont g\u00e9n\u00e9ralement\u00a0<strong>mesur\u00e9s<\/strong>\u00a0par un\u00a0<strong>syst\u00e8me incore<\/strong>\u00a0, install\u00e9 \u00e0 l&rsquo;int\u00e9rieur du r\u00e9acteur.\u00a0Bien que le\u00a0<strong>syst\u00e8me d&rsquo;instrumentation nucl\u00e9aire<\/strong>\u00a0fournisse une r\u00e9ponse rapide aux changements de flux de neutrons et qu&rsquo;il soit irrempla\u00e7able,\u00a0<strong>il doit \u00eatre \u00e9talonn\u00e9<\/strong>\u00a0.\u00a0La\u00a0<strong>puissance thermique pr\u00e9cise<\/strong>\u00a0du r\u00e9acteur ne peut \u00eatre mesur\u00e9e que par des m\u00e9thodes bas\u00e9es sur\u00a0<strong>le bilan \u00e9nerg\u00e9tique<\/strong>du circuit primaire ou bilan \u00e9nerg\u00e9tique du circuit secondaire.\u00a0Ces m\u00e9thodes fournissent une puissance de r\u00e9acteur pr\u00e9cise, mais ces m\u00e9thodes sont insuffisantes pour les syst\u00e8mes de s\u00fbret\u00e9.\u00a0Les signaux entrant dans ces calculs sont, par exemple, la temp\u00e9rature de la jambe chaude ou le d\u00e9bit \u00e0 travers le syst\u00e8me d&rsquo;eau d&rsquo;alimentation et ces signaux changent\u00a0<strong>tr\u00e8s lentement<\/strong>\u00a0avec les changements de puissance neutronique.\u00a0En d&rsquo;autres termes, la puissance thermique mesur\u00e9e par des m\u00e9thodes calorim\u00e9triques est pr\u00e9cise, tandis que la puissance nucl\u00e9aire mesur\u00e9e par des d\u00e9tecteurs de neutrons excore est le seul syst\u00e8me capable de d\u00e9tecter rapidement une excursion de r\u00e9activit\u00e9.<\/p>\n<h2>Taux de r\u00e9action &#8211; Proportionnalit\u00e9 entre le flux de neutrons et la puissance thermique<\/h2>\n<p>Voir aussi:\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/reaction-rate\/\">Taux de r\u00e9action<\/a><\/p>\n<p>La connaissance du\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-flux-neutron-intensity\/\"><strong>flux neutronique<\/strong><\/a>\u00a0(la\u00a0\u00a0<strong>longueur totale du trajet<\/strong>\u00a0\u00a0de tous les neutrons dans un centim\u00e8tre cube en une seconde) et\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/macroscopic-cross-section\/\"><strong>\u00a0des sections efficaces macroscopiques<\/strong><\/a>\u00a0\u00a0(la probabilit\u00e9 d&rsquo;avoir une interaction\u00a0\u00a0<strong>par centim\u00e8tre de longueur de trajet<\/strong>\u00a0) nous permet de calculer le taux d&rsquo;interactions (par exemple le taux des r\u00e9actions de fission).\u00a0<strong>Cette vitesse de r\u00e9action<\/strong>\u00a0\u00a0(le nombre d&rsquo;interactions ayant lieu dans ce centim\u00e8tre cube en une seconde) est alors donn\u00e9e en les multipliant ensemble:<\/p>\n<p><a href=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Reaction-Rate-Neutron-Flux.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13513 lazy-loaded\" src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Reaction-Rate-Neutron-Flux.png\" alt=\"Taux de r\u00e9action - Flux de neutrons\" width=\"548\" height=\"77\" data-lazy-type=\"image\" data-src=\"https:\/\/www.radiation-dosimetry.org\/wp-content\/uploads\/2019\/12\/Reaction-Rate-Neutron-Flux.png\" \/><\/a><\/p>\n<p><span>o\u00f9:<\/span><\/p>\n<p><strong><span>\u0424 &#8211;\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-flux-neutron-intensity\/\"><span>flux neutronique<\/span><\/a><span>\u00a0\u00a0(neutrons.cm\u00a0<\/span><\/strong><strong><sup><span>-2<\/span><\/sup><\/strong><strong><span>\u00a0.s\u00a0<\/span><\/strong><strong><sup><span>-1<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>\u03c3 &#8211;\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/microscopic-cross-section\/\"><span>section microscopique<\/span><\/a><span>\u00a0\u00a0(cm\u00a0<\/span><\/strong><strong><sup><span>2<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>N &#8211;\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/atomic-number-density\/\"><span>densit\u00e9 du nombre atomique<\/span><\/a><span>\u00a0\u00a0(atomes.cm\u00a0<\/span><\/strong><strong><sup><span>-3<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><span>La vitesse de r\u00e9action pour diff\u00e9rents types d&rsquo;interactions est trouv\u00e9e \u00e0 partir du type de section appropri\u00e9:<\/span><\/p>\n<ul>\n<li>\n<ul>\n<li>\n<ul>\n<li><strong><span>\u03a3\u00a0<\/span><\/strong><strong><sub><span>t<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0\u0424 &#8211; vitesse de r\u00e9action totale<\/span><\/strong><\/li>\n<li><strong><span>\u03a3\u00a0<\/span><\/strong><strong><sub><span>a<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0\u0424 &#8211;\u00a0\u00a0\u00a0vitesse de r\u00e9action d&rsquo;\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-absorption\/neutron-absorption-cross-section\/\"><span>absorption<\/span><\/a><\/strong><\/li>\n<li><strong><span>\u03a3\u00a0<\/span><\/strong><strong><sub><span>c<\/span><\/sub><\/strong><strong><span>\u00a0.\u00a0\u0424 &#8211;\u00a0\u00a0\u00a0vitesse de r\u00e9action de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-capture-radiative-capture\/\"><span>capture radiative<\/span><\/a><\/strong><\/li>\n<li><strong><span>\u03a3\u00a0<\/span><\/strong><strong><sub><span>f<\/span><\/sub><\/strong><strong><span>\u00a0.\u00a0\u0424 &#8211;\u00a0\u00a0\u00a0vitesse de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\"><span>r\u00e9action de fission<\/span><\/a><\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span>Pour d\u00e9terminer la\u00a0<\/span><strong><span>\u00a0puissance thermique<\/span><\/strong><span>\u00a0, nous devons nous concentrer sur la\u00a0\u00a0<\/span><strong><span>vitesse de r\u00e9action de fission<\/span><\/strong><span>\u00a0.\u00a0Pour simplifier, supposons que le\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/glossary\/fissionable-material\/\"><span>mat\u00e9riau fissile<\/span><\/a><span>\u00a0\u00a0est uniform\u00e9ment r\u00e9parti dans le r\u00e9acteur.\u00a0Dans ce cas, les\u00a0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/macroscopic-cross-section\/\"><span>coupes macroscopiques<\/span><\/a><span>\u00a0\u00a0sont ind\u00e9pendantes de la position.\u00a0La multiplication du\u00a0\u00a0<\/span><strong><span>taux de r\u00e9action de fission<\/span><\/strong><span>\u00a0\u00a0par unit\u00e9 de volume (\u00a0<\/span><strong><span>RR = \u0424. \u03a3<\/span><\/strong><span>\u00a0) par le\u00a0\u00a0<\/span><strong><span>volume total<\/span><\/strong><span>\u00a0\u00a0du c\u0153ur (V) nous donne le\u00a0<\/span><strong><span>\u00a0nombre total de r\u00e9actions<\/span><\/strong><span>\u00a0\u00a0se produisant dans le\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\"><span>c\u0153ur<\/span><\/a><span>\u00a0du\u00a0\u00a0<a href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor-core\/\">r\u00e9acteur<\/a>\u00a0\u00a0par unit\u00e9 de temps.\u00a0Mais nous savons \u00e9galement que la quantit\u00e9 d&rsquo;\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/energy-release-from-fission\/\"><span>\u00a0\u00e9nergie lib\u00e9r\u00e9e par une r\u00e9action de fission<\/span><\/a><span>\u00a0\u00a0est d&rsquo;environ\u00a0\u00a0<\/span><strong><span>200 MeV \/ fission<\/span><\/strong><span>.\u00a0Maintenant, il est possible de d\u00e9terminer la\u00a0\u00a0<\/span><strong><span>vitesse de lib\u00e9ration d&rsquo;\u00e9nergie<\/span><\/strong><span>\u00a0\u00a0(puissance) due \u00e0 la r\u00e9action de fission.\u00a0Il est donn\u00e9 par l&rsquo;\u00e9quation suivante:<\/span><\/p>\n<p><strong><span>P = RR.\u00a0E\u00a0<\/span><\/strong><strong><sub><span>r<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0V = \u0424.\u00a0\u03a3\u00a0<\/span><\/strong><strong><sub><span>f<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0E\u00a0<\/span><\/strong><strong><sub><span>r<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0V = \u0424.\u00a0N\u00a0<\/span><\/strong><strong><sub><span>U235<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0\u03c3\u00a0<\/span><\/strong><strong><sub><span>f\u00a0<\/span><\/sub><\/strong><strong><sup><span>235<\/span><\/sup><\/strong><strong><span>\u00a0\u00a0.\u00a0E\u00a0<\/span><\/strong><strong><sub><span>r<\/span><\/sub><\/strong><strong><span>\u00a0\u00a0.\u00a0V<\/span><\/strong><\/p>\n<p><span>o\u00f9:<\/span><\/p>\n<p><strong><span>P &#8211; puissance du r\u00e9acteur (MeV.s\u00a0<\/span><\/strong><strong><sup><span>-1<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>\u0424 &#8211; flux neutronique (neutrons.cm\u00a0<\/span><\/strong><strong><sup><span>-2<\/span><\/sup><\/strong><strong><span>\u00a0.s\u00a0<\/span><\/strong><strong><sup><span>-1<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>\u03c3 &#8211; section microscopique (cm\u00a0<\/span><\/strong><strong><sup><span>2<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>N &#8211; densit\u00e9 du nombre atomique (atomes.cm\u00a0<\/span><\/strong><strong><sup><span>-3<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p><strong><span>Er &#8211; l&rsquo;\u00e9nergie moyenne r\u00e9cup\u00e9rable par fission (MeV \/ fission)<\/span><\/strong><\/p>\n<p><strong><span>V &#8211; volume total du c\u0153ur (m\u00a0<\/span><\/strong><strong><sup><span>3<\/span><\/sup><\/strong><strong><span>\u00a0)<\/span><\/strong><\/p>\n<p>&nbsp;<\/p>\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>Cet article est bas\u00e9 sur la traduction automatique de l&rsquo;article original en anglais. Pour plus d&rsquo;informations, voir l&rsquo;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&rsquo;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les instrumentations nucl\u00e9aires sont g\u00e9n\u00e9ralement class\u00e9es en: Instrumentation nucl\u00e9aire Excore et Instrumentation nucl\u00e9aire Incore.\u00a0Les deux syst\u00e8mes sont bas\u00e9s sur la d\u00e9tection de neutrons.\u00a0Dosim\u00e9trie des rayonnements Dans\u00a0les r\u00e9acteurs nucl\u00e9aires\u00a0, la puissance thermique produite par les fissions nucl\u00e9aires est proportionnelle au niveau du flux neutronique.\u00a0Par cons\u00e9quent, du point de vue de la s\u00e9curit\u00e9 du r\u00e9acteur, il est &#8230; <a title=\"Qu&rsquo;est-ce que l&rsquo;instrumentation nucl\u00e9aire &#8211; D\u00e9finition\" class=\"read-more\" href=\"http:\/\/www.radiation-dosimetry.org\/fr\/quest-ce-que-linstrumentation-nucleaire-definition\/\" aria-label=\"En savoir plus sur Qu&rsquo;est-ce que l&rsquo;instrumentation nucl\u00e9aire &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[49],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que l&#039;instrumentation nucl\u00e9aire - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Les instrumentations nucl\u00e9aires sont g\u00e9n\u00e9ralement class\u00e9es en: Instrumentation nucl\u00e9aire Excore et Instrumentation nucl\u00e9aire Incore. 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