[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-203509-105":3,"detail-sidebar-cat-0-en-105":73,"doc-detail-203509-en":122},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":66,"head_meta":68,"extra_data":70,"updated_unix":72},105,"en","the-project-of-the-new-research-reactor-frm-ii-at-munich","THE PROJECT OF THE NEW RESEARCH REACTOR FRM-II AT MUNICH","","A new national research reactor is planned in Germany to replace the existing FRM facility at Garching. FRM-II is optimized mainly for beam tube applications while also enabling irradiation of samples and supporting additional experimental uses. The compact core concept uses a small H2O-cooled core in the center of a large D2O moderator tank to achieve high thermal neutron flux at 20 MW. Technical design features and key performance assumptions are discussed, including neutron flux expectations and reactor systems.",{"@graph":14,"@context":65},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/the-project-of-the-new-research-reactor-frm-ii-at-munich/203509/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/the-project-of-the-new-research-reactor-frm-ii-at-munich/203509.png","ImageObject",300,407,{"name":42,"@type":43},"Jacob","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-07","2026-09-04",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",8,{"@type":57,"mainEntity":58},"FAQPage",[59],{"name":60,"@type":61,"acceptedAnswer":62},"What reactor power and neutron flux performance are targeted?","Question",{"text":63,"@type":64},"The concept targets a 20 MW reactor power. Unperturbed calculations indicate a thermal neutron flux maximum of about 8 x 10^14 in the D2O moderator tank at 20 MW.","Answer","https://schema.org",{"og:url":32,"og:type":67,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":69,"canonical":32},"index,follow",{"doc_id":71,"site_id":7},203509,1788561601,{"code":4,"msg":74,"data":75},"success",[76,80,84,88,93,98,103,106,111,114,118],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":77,"show_sort_weight":78,"slug":79},"Story & 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Munich  \nK.Böning  \nFakultät fir Physik E21,Technische Universität München,8046 Garching,FRG Germany  \n# ABSTRACT\n\nA new national research reactor is planned in Germany which shallreplace the existing FRM reactor at Garching.The new FRM-II willbe optimized prima:rily with respect to beam tube applications butit will also allow the irradiation of samples etc..Because of the\"compact core reactor concept\",which provides for a particularly6mall H₂O cooled reactor core in the center of a large D₂O mode-rator tank,high values of the thermal neutron flux can beobtained at only 20 MW power.This paper also discusses some ofthe features of the technical concepts of the new reactor.  \n# INTRODUCTION\n\nThe existing researrch reactor FRM of the Technical University ofMunich at Garching -a conventional swimming pool reactor of 4 MWpower -has become more than 30 years old now.Plans to modernizeit or -finally -Lo completely replace it with a new one havebeen made for years.As a result of this design effort the socalled\"compact core reactor concept\"has been developed whichwill be discussed in the next section of this paper.The newresearch reactor FRM-II is considered to become the main nationalneutron source of the coming decades.It is being designed as ahigh performance but nevertheless relatively small reactor -asnay also be deduced by realizing the distinction between a natio-nal and an internat:ional project in Europe.  \nThe scientific case has been often discussed in Germany during thelast couple of years and strong support has always been obtainedfrom the German scientific community and refereeing institutions.Recently further progress has also been achieved on the politicallevel with respect to the funding of the project.At present weare working on the conceptual design and on the safety report oft:he facility.  \n4  \n# COMPACT CORE REACTOR CONCEPT\n\nThe new neutron source shall be optimized primarily with respectto beam tube applications.That is,high flux levels and purespectra of thermal neutrons have to be provided in a large useablevolume outside of the core.All this has to be achieved at a rela-tively small value of the reactor power which has been establishedto be 20 MW.So our design studies have led to the concept of aparticularly small reactor core cooled by light water and situatedin the center of a large heavy water moderator tank /1,2/.  \nThis “compact core”consists of a single,cylindrical fuel elementwith 113 fuel plates which have the shape of involutes.The innerand outer diameters of the two aluminum core tubes(\"side plates\")are 118 and 243 mm,respectively,and the active height of thefuel plates is 700 mm.The light water of the primary coolingcircuit flows at a velocity of 17.5 m/s downwards through thecooling channels -which are 2.2 mm wide -between the plates.Thefull excess reactivity of the core will be controlled by a singlehafnium absorber cylinder(with an aluminum filler)which movesupwards in the inner core tube during the cycle and which isfollowed by a beryllium inner moderator.A long,vertical corechannel tube separates the core and its H₂O cooling circuit fromthe surrounding moderator tank which contains heavy water andwhich has dimensions of 2500 mm both in diameter and height.In addition to all the experimental installations five safetyshutdown rods are provided for in the D₂O tank which are,however,fully withdrawn during normal reactor operation.The D₂O tank with.the core and all the equipment is placed in the center of thereactor pool containing light water.  \nThe design value of the reactor cycle length is 45 -50 days.Inorder to obtain the necessary excess reactivity with such a smallcore,high enriched uranium(938)will be used in combination withthe new high densitydispersion fuel.With an activevolume of only 17.6 liter the average power density in the compactcore is 1.15 MW/liter.The power densi","cbCain4LpiJwMN1l","https://ap.wps.com/l/cbCain4LpiJwMN1l","pdf",395062,12,"English","# ABSTRACT\n# INTRODUCTION\n# COMPACT CORE REACTOR CONCEPT\n# FEATURES OF THE PLANT DESIGN","[{\"question\":\"What reactor power and neutron flux performance are targeted?\",\"answer\":\"The concept targets a 20 MW reactor power. Unperturbed calculations indicate a thermal neutron flux maximum of about 8 x 10^14 in the D2O moderator tank at 20 MW.\"}]","THE PROJECT OF THE NEW RESEARCH REACTOR FRM-II AT MUNICH | PDF"]