Science Fiction ✓ Voir Introduction au génie atomique Kindle par Jacques BOUCHARD

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SITUATION ET PERSPECTIVES Bien que d couverte il y a peine plus d un demi si cle, l nergie nucl aire permet aujourd hui de satisfaire 75% de la production d lectricit en France Cette situation reste toutefois exceptionnelle puisque pour l ensemble du monde elle repr sente seulement 17% de l nergie lectrique et d l ordre de 5% de la consommation totale d nergie primaire Ces chiffres ne concernent que l nergie produite par la fission de noyaux lourds la ma trise de l nergie de fusion de noyaux l gers, dont le principe est pourtant connu depuis plus longtemps, en est encore au stade des recherches parce que beaucoup plus difficile Nous limiterons donc notre propos dans la suite l nergie de fission et aux r alisations industrielles correspondantes L utilisation de l nergie nucl aire pr sente les caract ristiques suivantes une nergie produite par unit de masse de combustible environ deux millions de fois plus grande que celle de la combustion chimique des combustibles fossiles une mise en oeuvre complexe, n cessitant des installations importantes et de haute technologie, d o une part lev e des investissements dans le co t de production d nergie une s ret qui doit tre irr prochable, compte tenu du niveau de risque associ , et qui se traduit en particulier par une plus grande protection de l environnement que pour toute autre source d nergie une valorisation quasi exclusive par la production d lectricit en raison de la taille n cessaire pour des installations s res et rentables et de l absence d un autre vecteur de transport de l nergie offrant des caract ristiques de souplesse quivalentes un co t de production dont la comp titivit avec les autres sources d nergie est aujourd hui bien tablie quoique variant notablement d un pays l autre en fonction des ressources naturelles, des m canismes financiers et des conditions d industrialisation Apr s un historique du d veloppement industriel de l nergie nucl aire, nous examinerons la situation de l nergie dans le monde et le cas particulier de la demande et de la production d lectricit en France, avant d esquisser quelques perspectives futures 1 1.1 LE DEVELOPPEMENT INDUSTRIEL DE L ENERGIE NUCLEAIRE Le d veloppement de la production d nergie d origine nucl aire a connu trois grandes phases l poque des d couvertes C est en 1939 qu intervient la d couverte fondamentale, celle de la fission et de la possibilit de r actions en cha ne Tr s rapidement, des brevets sont d pos s et des perspectives de production massive d nergie sont bauch es La seconde guerre mondiale va la fois bouleverser ces projets et entra ner un gigantesque effort de recherche, orient vers la production d une arme terrifiante cet effort de recherche b n ficiera tr s vite aux applications nerg tiques d s la fin du conflit Aux Etats Unis, dans le cadre du projet Manhattan, le premier r acteur nucl aire, on disait alors une pile atomique, diverge le 2 d cembre 1942 Chicago Il sera suivi par la construction de deux grands r acteurs plutonig nes sur le site de Hanford Etat de Washington Parall lement, la s paration isotopique de l uranium permettant d isoler l isotope tr s fissile, de masse 235, est mise au point et des usines mettant en oeuvre la voie lectromagn tique et la diffusion gazeuse sont d velopp es En deux ans, les chercheurs et les ing nieurs r ussissent tout la fois les mises au point de proc d s, le d veloppement de technologies nouvelles et la r alisation de premi res unit s pr industrielles.Cet ouvrage rassemble les l ments fondamentaux du g nie atomique, un ensemble de connaissance n cessaires pour comprendre les probl mes rencontr s par les ing nieurs dans la mise en oeuvre de l nergie nucl aire pour la production d lectricit Il a t r dig comme support un enseignement de 25 heures dispens aux l ves ing nieurs de l Ecoles des mines de Paris Sans pr tendre l exhaustivit , il traite des questions essentielles pour la conception des r acteurs de production et des installations du cycle des combustibles nucl aires. 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