SE185965C1

SE185965C1 -

Info

Publication number: SE185965C1
Authority: SE
Publication date: 1963-01-01

Description

Prioritet begard frail den 20 mai 1960 (Frankrike) Atomteknikens utveckling nodvandiggor latt tillgangliga stralningskallor for studium av vissa materials beteende under bestralning. Priority requested from 20 May 1960 (France) The development of nuclear technology necessitated accessible radiation sources for the study of the behavior of certain materials during irradiation.

For detta Andamal liar man frarafor alit konstruerat vissa simbassangreaktorer, hos vilka reaktorkarnzonen är sarskilt latt tillganglig. Framfor allt har man konstruerat en reaktor av detta slag, hos vilken karnan och tillhorande organ aro belagna mitt i has sangen i form av ett sasom lblockstapeb> betecknat aggregat. For this purpose, certain swimming pool reactors have been previously constructed, in which the reactor core zone is particularly easily accessible. Above all, a reactor of this kind has been constructed, in which the core and associated organs are coated in the middle of the shaft in the form of a unit called a block tape.

I en sadan reaktor anordnar man kring blockstapeln sjalvstandiga slingor, i vilka under bestamda betingelser de material aro anbragta, vilka skola studeras under bestralning. Bestralningen utgar fran blockstapeln, som innehaller elementen av klyvbart material och regleringsstavarna. In such a reactor, independent loops are arranged around the block stack, in which conditions the materials which are to be studied during irradiation are placed under certain conditions. The irradiation emanates from the block stack, which contains the elements of fissile material and the control rods.

Hos dylika speciella reaktarer fOr studieoch forsoksandamal anvandes sasom slinga ett aggregat, som i huvudsak innefattar en eventuellt i sig sluten huvudkanal, som I ett °wade är utsatt for ett stralningsflode och som i detta omrade innehMler det material eller det element som skall undersokas under bestralning. Aggregatet omfattar dessutom anordningar, med vilka:s hj alp ett flytande medium kan cirkulera kring materialet eller elementet under givna temperatur- och tryckvillkor. Om slingan fir av fristaende och rorlig typ, sasom dr fallet enligt fOreliggande uppfinning, omfattar uttrycket slinga icke endast sjalva kanalen utan samtliga anslutna organ RV uppbarande och manovrering av kanalen. In such special reactors for study and research purposes, a unit is used as the loop, which essentially comprises a main channel which is closed in itself, which in a field is exposed to a radiation flood and which in this area contains the material or element to be examined during irradiation. . The unit further comprises devices, by means of which a liquid medium can circulate around the material or element under given temperature and pressure conditions. If the loop is of a free-standing and movable type, as is the case according to the present invention, the term loop comprises not only the channel itself but all connected means RV carrying and maneuvering the channel.

Dylika sjaivstandiga slingor maste i framsta nunmet innehalla en forsokskanal, som innehaller de material, vilka skola studeras, samt anordningar for att i denna kanal astadkomma ett kretslopp av en kylgas for kylning av de bestralade materialen. Dessutom Dupl. kl. 21 g: 21/12 ar det Midvandigt att de erforderliga atgarderna for handhavande av de bestralade materialen (inforandet av proven i kanalen eller dessas uttagning) skola kunna utforas utan svarighet. Such independent loops must in the first place contain an experimental channel, which contains the materials which are to be studied, as well as devices for providing in this channel a cycle of a cooling gas for cooling the irradiated materials. Also Dupl. at 21 g: 21/12 it is customary that the necessary procedures for handling the irradiated materials (the introduction of the samples into the channel or their extraction) should be carried out without liability.

Dessutom maste slingoma ha stodpunkter i reaktorkamans narhet, vara rorliga och at-era ett styvt aggregat for underlattande av exakt placering kring reaktorkarnan. In addition, the loops must have standing points in the vicinity of the reactor core, be movable and have a rigid assembly to facilitate precise placement around the reactor core.

Foremalet for fOreliggande uppfinning är en splvstandig slinga i en simbassangreaktor for studium av f Or straining utsatta material, vilken slinga i sarskilt hog grad svarar mot ovan angivna onskemal. The object of the present invention is a flexible loop in a swimming pool reactor for the study of exposed materials, which loop corresponds to a particularly high degree to the above-mentioned wishes.

Slingan gor det framfor alit mojligt att utsatta prov av givna material for bestralningar, varvid proven exempelvis kunna utgiiras av bransleelement, och forsdket utfores i en bestanad miljO, exempelvis en atmosfar av kolsyreanhydrid under ett bestamt tryck. Den i slutet kretslopp cirkulerande gasen kyler proven och kyles i sin tur i en varmevaxlare med forcerad eller naturlig cirktulation. The loop makes it possible, above all, to subject samples of given materials to irradiation, whereby the samples can, for example, be made of fuel elements, and the test is carried out in a tolerated environment, for example an atmosphere of carbon dioxide under a certain pressure. The gas circulating at the end of the cycle cools the samples and cools them in turn in a heat exchanger with forced or natural circulation.

Uppfinningen hanfor sig till en sjalvstandig slinga i en simbassangreaktor for studium av for straining utsatta material, vilken slinga kannetecknas clarav, att den innefattar ett kylkretslopp, i vilket ingar en forsokskanal, en kylkretsloppet uppbarande konstruktion, ett underrede, med dels konstruktionen, dels underredet fast fOrbundna organ, villa me& giva en forflyttning av konstruktionen i forhallande till underredet, och en finregleringsanordning for installning av forsokskanalen mot reaktorns karna genom styrning av namnda konstruktions forskjutning i farhallande till underredet. The invention relates to an independent loop in a swimming pool reactor for the study of materials exposed to straining, which loop can be characterized in that it comprises a cooling circuit, in which a test channel, a cooling circuit supporting a structure, a chassis, partly the structure and partly the base fixed Connected means, villas allow a movement of the structure in relation to the chassis, and a fine control device for installing the test channel against the reactor cores by controlling the displacement of the said structure in relation to the chassis.

Enligt andra kannetecken fOr uppfinningen kan vdrmevaxlaren I framsta rummet vara av endera av tva olika typer, namligen antingen en vannevaxiare med ett rorknippe, i vilket 2— — kylvattnet cirkulerar under inverkan av en hjalppump, eller en varmeyaxlare med paraldella korrugeringar, vilka kylas genom naturlig konvektion hos vattnet i bassangen. According to other features of the invention, the heat exchanger may primarily be of either of two different types, namely either a water exchanger with a tube, in which the cooling water circulates under the action of an auxiliary pump, or a heat exchanger with parallel corrugations, which are cooled by natural convection of the water in the basin.

Enligt en utforingsform av uppfinningen innefattar forsokskanalen i sin ovre del en propp, som är tatad med hjfilp av packningar och vid vilken fir upphangd en. korg, i vilken de bestralade elementen arc anbragta, varvid proppen vilar dels pa forsokskanalens vagg med hjalp av en Iran borjan darvid anbragt avsats, dels pa en gaffed, som stracker sig genom kanalens vaggar ovanfOr tatningen och genom proppen utmed tva parallella korder. According to an embodiment of the invention, the test channel comprises in its upper part a plug, which is fastened with the aid of gaskets and to which a suspension is made. basket, in which the irradiated elements are placed, the stopper resting partly on the cradle of the test channel with the aid of an Iran initially placed ledge, partly on a gaffed, which extends through the cracks of the channel above the seal and through the stopper along two parallel cords.

Enligt en annan utfOringsform av uppfinningen utgaras anordningar for snabb demon-taring av forsokskanalen av en sammansatt mekanisk anordning, som i huvudsak innefattar: Ett forsta aggregat i fast forbindelse med proppen, som innefattar en forsta rorformig hylsa i fast fOrbindelse med proppen vid ena anden, medan den andra anden doper ut i en utvidgning eller flans; — ett andra aggregat i fast forbindelse med korgen, vilket i huvudsak innefattar en andra rorformad hylsa med nagat mindre ytterdiameter an den forsta hylsans innerdiameter; organ for forbindande av det fOrsta aggregatet med det andra aggregatet, vilka organ besta av en anordning av tre kulor pa 10 -vinkelavstand Iran varandra, vilka kulor fast-lianas med ett visst spel i den forsta hylsans vdggar och vilka kunna inforas i motsvarande sfariska urtag, vilka for andamalet aro anordnade i den andra hylsans vaggar; en tredje laylsa, som crmgiver den forsta hylsan och som dr fast forbunden med en fj5.- der, vats matsatta finde ar fastgjord vid prop-pen. Den tredje hylsan anligger under fjaderns verkan mot flansen pa den forsta hylsan och astadkommer darigenom en place-. ring av kulorna i tillhorande urtag; tvd fasta anslag pa den ande av den andra hylsan som icke at fastgjord vid korgen, vilka anslag sakerstalla korrekt install-fling av de sfariska urtagen pa den andra hylsan mittfor kulorna. According to another embodiment of the invention, devices for rapid disassembly of the test channel are provided by a composite mechanical device, which essentially comprises: A first assembly in fixed connection with the plug, which comprises a first tubular sleeve in fixed connection with the plug at one end, while the other spirit dips out into an extension or flange; A second assembly in fixed connection with the basket, which essentially comprises a second tubular sleeve with a slightly smaller outer diameter than the inner diameter of the first sleeve; means for connecting the first assembly to the second assembly, which means consist of a device of three spheres at an angular distance from each other, which spheres are fixed with a certain play in the walls of the first sleeve and which can be inserted into corresponding spherical recesses. , which for the spirit are arranged in the cradles of the second sleeve; a third laylsa, which encloses the first sleeve and which is fixedly connected to a spring, whose matte fin is attached to the plug. The third sleeve abuts under the action of the spring against the flange of the first sleeve and thereby provides a place-. ringing of the balls in the associated recesses; two fixed abutments on the spirit of the second sleeve which are not attached to the basket, which abutments ensure proper installation of the spherical recesses on the second sleeve opposite the balls.

Den korg, i vilken de undersokta bransleelementen an.ordnas, bestar ay fyra U-stavar I korsformig anordning, varyid U-profilernas konkava parti är vant mat mitten. Bransleelementens holjen innefatta hi. a. fyra fivenIedes i karsform anordnade flansar, vilka aro insatta i U-prafilernas konkava partier. The basket in which the examined fuel elements are arranged consists of four U-rods in a cruciform arrangement, the concave portion of the U-profiles being used in the middle. The casing of the fuel elements include hi. a. four flanges arranged in vascular form, which are inserted in the concave portions of the U-profiles.

I enlighet med uppfinningen utgOras de kanaler, i vilka kylgasen cirkulerar, av tva inbardes koaxiella rör, median vilka ett ring-format utrymme bildas. I detta utrymme forekommer ett flytande medium, exempelvis av samma slag som kylmediet, varigenom en termisk isolation mellan vattnet i bassangen och kylmediet i slingan erhalles. In accordance with the invention, the channels in which the cooling gas circulates are formed by two coaxial tubes, the median of which a ring-shaped space is formed. In this space there is a liquid medium, for example of the same kind as the coolant, whereby a thermal insulation between the water in the basin and the coolant in the loop is obtained.

Uppfinningen beskrives narmare med ledning ay bifogade ritningar, vilka avse ett utforingsexempel, till vilket uppfinningen dock icke fir inskrankt och i vilka fig. 1 at en sidovy, som onase sidor om vertikalaxeln visar tva utforingsformer ay den sjalystandiga sling-an enligt uppfinningen, anordnade kring en blockstapel i en simbassangreaktor, fig. 2 dr en sektion ay ett forsta avsnitt ay en forsOkskanal i en slinga enligt uppfinningen, fig. 3 dr en sektion av ett andra aysnitt ay fOrsokskanalen, fig. 4 är en sedition av ett tredje avsnitt av forsokskanalen, fig. 5 dr en sedition av kanalen utmed linjeni fig. 2, fig. 6 at en sektion ay kanalen utmed linjen i fig. 2, fig. 7 dr en sektion av kanalen ut- med linjeni fig. 2, fig. 8 dr en sek- tion av kanalen utmed linjen IV—IV i fig. 3 och fig. 9 fir en detaljerad vy av anordningen for koppliug median proppen och korgen enligt den i fig. 2 visade utforingsformen. The invention is described in more detail with reference to the accompanying drawings, which relate to an exemplary embodiment, to which the invention, however, is not limited and in which Fig. 1 is a side view, which shows sides of the vertical axis, a block stack in a swimming pool reactor, Fig. 2 is a section of a first section of a test channel in a loop according to the invention, Fig. 3 is a section of a second section of the test channel, Fig. 4 is a sedition of a third section of the test channel. Fig. 5 shows a section of the channel along the line in Fig. 2, Fig. 6 shows a section of the channel along the line in Fig. 2, Fig. 7 shows a section of the channel along the line in Fig. 2, Fig. 8 dr a section of the channel along the line IV-IV in Fig. 3 and Fig. 9 is a detailed view of the device for coupling the median plug and the basket according to the embodiment shown in Fig. 2.

I fig. 1 visas en blockstapel 1 med laget for reaktorkarnan 2 antytt. Pa omse sidor om blockstapeln visas tva utforingsformer av sjalvstandiga slin.gor 3 och 4 enligt uppfinningen. Fig. 1 shows a block stack 1 with the layer for the reactor core 2 indicated. On two sides of the block stack, two embodiments of independent slits 3 and 4 according to the invention are shown.

Enligt en utforingsform av uppfinningen innefattar slingan 3 ett kylmedelskretslopp, som uppbares ay en. rorlig konstruktion 54 pa ett underrede 56, som vid beslag 5 och 6 är fastgjort vid bassangens vertikala vagg. According to an embodiment of the invention, the loop 3 comprises a coolant circuit, which is carried in one. movable structure 54 on a chassis 56, which at fittings 5 and 6 is attached to the vertical cradle of the basin.

Konstruktionens 54 forskjutning I forhallande till underredet 56 manovreras fran bassangens utsida med en finregleringsanordning for placering av slingan mot liarnan 2, exempelvis med hjalp ay en damkraft 14. Pa konstruktionen 54 arc f. a. rullar 7 anordnade, medan underredet at fOrsett med en rullbana 55, pa vilken konstruktionen 54 fir forskjutbar i forhallande till underredet 56. Displacement of the structure 54 In relation to the chassis 56 is maneuvered from the outside of the basin with a fine adjusting device for positioning the loop towards the line 2, for example with the aid of a dam force 14. On the structure 54 which the structure 54 is displaceable in relation to the chassis 56.

En motordriven flakt 8 astadkommer cirkulation av kylgasen i kylmedelskretsloppet, vilket i huvudsak omfattar ett forsoksror 9 for upptagande av tva bransleelement 10 och 11 i hOjd med block.stapelns karn.a 2. En varmevaxlare 12, som avenledes utgor en del av kylmedelskretsdoppet, innefattar en hjalppump 13. Pa forsoksraret 9 dr en propp 15 och ett stod 16 far en av beryllium bestaende reflektor 17 anbragta. A motor-driven flap 8 provides circulation of the cooling gas in the coolant circuit, which essentially comprises a test tube 9 for receiving two fuel elements 10 and 11 at the height of the core of the block stack 2. A heat exchanger 12, which is thus part of the coolant circuit, comprises an auxiliary pump 13. On the test tube 9 there is a plug 15 and a stand 16 with a reflector 17 consisting of beryllium placed.

Enligt en annan utforingsform av uppfinningen innefattar den avenledes i fig. 1 visade slingan 4 ett forsOksrOr 9, en propp 15, ett stod 16 for en berylliumreflektor 17 och brans-'element 10 och 11 i hajd med blockstapelns karna 2. According to another embodiment of the invention, the loop 4 also shown in Fig. 1 comprises a test tube 9, a plug 15, a stand 16 for a beryllium reflector 17 and branch elements 10 and 11 in height with the blocks 2 of the block stack.

Vid denna utforingsform uppbares kylmedelskretsloppet av en riirlig konstruktion 57 pit ett underrede 59, som vilar pa stod 18 och 19 pa bassangens batten. Pa samma sitt som vid den tidigare beskrivna utforingsformen naedgiva rullar 20 och en rullbana 58 en forskjutning ay konstruktionen 57 i forhallande till underredet 59. Dessutom innefattar denna — —3 slinga i likhet med den tidigare beskrivna en motordriven fldkt 8 och en domkraft 14. En av de vfisentliga skillnaderna mellan slingan 4 och den tidigare beskrivna slingan 3 bestar dari att varmevalaren 21 utgares av ror 22 i inbordes parallell anordning °eh kylda genom den naturliga konvektionsstromningen i bassangens vatten. In this embodiment, the coolant circuit is supported by a rigid structure 57 on a base 59, which rests on stands 18 and 19 on the bottom of the basin. In the same way as in the previously described embodiment, rollers 20 and a roller track 58 provide a displacement of the structure 57 in relation to the chassis 59. In addition, this loop, like the previously described, comprises a motor-driven float 8 and a jack 14. A of the essential differences between the loop 4 and the previously described loop 3 consists in that the heat exchanger 21 is provided by tubes 22 in an inboard parallel device and cooled by the natural convection flow in the water of the pool.

I fig. 2, 3 och 4 visas en langdsektion av en fOrsokskanal 9 enligt uppfinningen. I det fOrsta avsnittet enligt fig. 2 visas proppen 23. Tat-fling mellan proppen 23 och roret 24 i forsakskanalen 9 astadkommes med hjalp av tre packningar 25, 26 och 27. Proppen uppbar en anordning 28 far fastsattning av en korg 29 vid proppen 23. Proppen uppbares dels av en flans 30, som vilar pa raret 24 Over en daremellan anbragt packning 31, dels av en gaffel 32 (fig. 5), soin stracker sig genom rOret 24 och proppen 23 utmed tva parallella korder. Infdstningsanordningen 28 (fig. 9) innefattar en forsta hylsa 33 i fast forbindelse med proppen 23 vid den ena anden, medan den vid den andra Linden är forsedd med en utvidgning eller en flans 31. Figures 2, 3 and 4 show a longitudinal section of a test channel 9 according to the invention. In the first section according to Fig. 2 the plug 23 is shown. Tat-fling between the plug 23 and the tube 24 in the lead channel 9 is effected by means of three gaskets 25, 26 and 27. The plug carried a device 28 for attaching a basket 29 to the plug 23 The plug is supported partly by a flange 30, which rests on the tube 24 over a gasket 31 arranged therebetween, and partly by a fork 32 (Fig. 5), which extends through the tube 24 and the plug 23 along two parallel cords. The fastening device 28 (Fig. 9) comprises a first sleeve 33 in fixed connection with the plug 23 at one end, while at the other end the Linden is provided with an extension or a flange 31.

En andra hylsa 35, vars ytterdiameter ãr nagot mindre an hylsans 33 innerdiameter, an fast forbunden med korgen 29. I den fOrsta hylsan 33 aro tre kulor 36 anordnade, vilka astadkomma en fast forbindelse mellan hylsan 35 och hylsan 33, nar de aro inforda i sfariska urtag 37, anordnade i en med hylsan 35 fast forbunden ring 35a. Kulorna 36 fasthallas i sina urtag 37 genom en tredje hylsa 38, som under inverkan av en fjader 39 anlagger sig mot fldnsen 34 pa hylsan 33 och i detta lfige fasthaller kulorna 36 i urtagen 37. A second sleeve 35, the outer diameter of which is slightly smaller than the inner diameter of the sleeve 33, is fixedly connected to the basket 29. In the first sleeve 33 three balls 36 are arranged, which provide a fixed connection between the sleeve 35 and the sleeve 33, when inserted into spherical recesses 37, arranged in a ring 35a fixedly connected to the sleeve 35. The balls 36 are held in their recesses 37 by a third sleeve 38, which under the action of a spring 39 abuts against the flange 34 of the sleeve 33 and in this case the balls 36 hold in the recesses 37.

For frigorande av proppen 23 Iran korgen 29, vilken atgard 1 regel utfores 1 ett hett arbetsrum, är det tillräckligt att forskjuta hylsan 38 under hoptryekning av fjadem 39 tack vare ett ringformat spar 40, som for detta dndamal är anordnat i hylsan 38, till ett lage, I vilket hylsan 38 icke langre utovar nagot tryck pa kulorna. Nar kulorna icke ldngre fasthallas i sina urtag 37, kan proppen 23 frig6ras Iran korgen 29. To release the plug 23 from the basket 29, which is usually made in a hot working space, it is sufficient to displace the sleeve 38 while compressing the spring 39 thanks to an annular groove 40, which for this purpose is arranged in the sleeve 38, to a layer, in which the sleeve 38 no longer exerts any pressure on the balls. When the bullets are no longer held in their recesses 37, the plug 23 can be released into the basket 29.

For farnyad hopsattning Or det av betydelse att vane urtag 37 intager ett ldge mittfor tillhorande kula 36 och for detta andamal fir hylsan 35 forsedd med tva utskott 41, av vilka endast ett visas i fig. 9, medan hylsan 33 Or forsedd med oppningar 42 far upptagande av namnda utskott 41. Det Or da tillräckligt att vrida proppen 23 i forhallande till korgen 29 till dess att utskotten 41 kommit i ingrepp med oppningarna 42, vilket intraffar i samma ogonblick som kulorna 36 befinna sig mittfor urtagen 37. For reassembly, it is important that the usual recess 37 occupies a space opposite the associated ball 36 and for this purpose the sleeve 35 is provided with two projections 41, of which only one is shown in Fig. 9, while the sleeve 33 is provided with openings 42. accommodating said projections 41. It is sufficient to rotate the plug 23 in relation to the basket 29 until the projections 41 have engaged with the openings 42, which occur at the same moment as the balls 36 are opposite the recesses 37.

Av fig. 2-8, och framfor alit fig. 5-8, framgar, att de kanaler, i vilka kylgasen cirkulerar, utgOras av tva koncentriska rex 24 och 43, mellan vilka befinner sig ett ringfor mat utrymme 44. I detta utrymme 44 ar ett flytande medium av samma beskaffenhet som kylmediet inneslutet, varigenom en termisk isolation erhalles mellan vattnet i bassfingen och kylmediet I slingan. From Figs. 2-8, and in particular from Figs. 5-8, it can be seen that the channels in which the cooling gas circulates are formed by two concentric rails 24 and 43, between which there is an annular space 44. In this space 44 is a liquid medium of the same nature as the coolant enclosed, whereby a thermal insulation is obtained between the water in the base finger and the coolant in the loop.

I fig. 2 visas korgens 29 Linde 45, pa vilken tallrikar 46 Oro anordnade, vilka astadkomma en zon med orOrliga gasmfingder, varigenom alltfor varma gaser hindras fran att komma fram till och skada packningarna 25, 26 och 27. Fig. 2 shows the basket 29 of the basket 29, on which plates 46 are arranged, which provide a zone with immobile gas fingers, whereby excessively hot gases are prevented from reaching and damaging the gaskets 25, 26 and 27.

I fig. 2 visas Liven avledningskanalen 47 for den i forsokskanalen g eirkulerande gasen. Fig. 2 shows the Liven discharge channel 47 for the gas circulating in the test channel.

I fig. 3 och 4 visas ldget far de material 10 och 11, vilka skola undersokas i forsokskanalen. I fig. 4 visas Oven tilloppskanalen 48 for kylgasen. Figures 3 and 4 show the material of the materials 10 and 11 which are to be examined in the test channel. Fig. 4 also shows the inlet duct 48 for the cooling gas.

N utsidan av forsakskanalen (fig. 2) visas en anordning 49, som bestar av en fjader 50 och en kula 51 och som tjdnar att forregla gaffeln 32, dã den uppbar proppen 23. N the outside of the forsak channel (Fig. 2) a device 49 is shown, which consists of a spring 50 and a ball 51 and which serves to lock the fork 32 when it received the plug 23.

I fig. 5-8 visas forsokskanalens ytterrar 24, kan.alens innerror 43 och det ringformade utrymmet 44 mellan de hada r8ren, i vilket det flytande medium Or inneslutet som bildar varmeisoleringen. Figs. 5-8 show the outer 24 of the test duct, the inner tubes 43 of the duct and the annular space 44 between the main tubes, in which the liquid medium Or is enclosed which forms the thermal insulation.

I fig. 6, scm är en sektion utmed linjen II —II i fig. 2, visas Liven fjadern 39, hylsan 35 samt utskotten 41. In Fig. 6, which is a section along the line II-II in Fig. 2, the Liven spring 39, the sleeve 35 and the projections 41 are shown.

I fig. 7, som an en sektion utmed linjen I fig. 2, visas speciellt hylsan 38, hylsan 34 och kulorna 36 i sina urtag i hylsan.s 35 ring 35a. In Fig. 7, as in a section along the line in Fig. 2, in particular the sleeve 38, the sleeve 34 and the balls 36 are shown in their recesses in the ring 35a of the sleeve 35.

I fig. 8, som Or en sektion utmed linjen IV—IV i fig. 3, visas ett bransleelement 10 med kylflansar 52 och med fyra flamer 53 med starre dimensioner. Korgen 29 bestar av fyra U-profiler 54, anordnade i korsform och upptagande de fyra stora flansarna 53 pa bransleelementet 10. In Fig. 8, as Or a section along the line IV-IV in Fig. 3, a fuel element 10 is shown with cooling flanges 52 and with four flames 53 with larger dimensions. The basket 29 consists of four U-profiles 54, arranged in cross shape and receiving the four large flanges 53 on the fuel element 10.

Uppfinningen Or givetvis icke inskrfinkt till de visade och beskrivna utforingsformerna utan omfattar alla utforingsformer mom ramen for dess grundtanke. The invention is of course not limited to the embodiments shown and described, but encompasses all embodiments within the scope of its basic idea.

Claims

By tent and pr ak:

An independent loop in a swimming pool reactor for the study of materials subjected to straining, characterized in that it comprises a coolant circuit with a test channel, a structure which carried the coolant circuit, a chassis, devices in connection with the structure and the chassis for the construction of the structure. displacement in relation to the chassis, a fine-adjusting device for the test channel's bearing against the reactor cores for controlling the displacements of the structure in relation to the chassis.

2. A loop according to patent claim 1, characterized in that the coolant circuit comprises a motor-driven flange, a test duct with thermal insulation and means for rapid disassembly of the supply duct, a. heat exchanger, em reflector and a reflector stand mounted outside the test channel.

Loop according to claim 1 or 2, characterized in that the coolant circuit comprises a detector circuit for determining the radioactivity radiating in the refrigerant circuit, feeding means and coupling devices.

Loop according to patent claim 1, characterized in that said devices, which allow the movement of the structure in relation to the chassis, comprise rollers connected to the structure and a roller track connected to the chassis. 5.

Loop according to patent claim 4, characterized in that the roller conveyor is supported by an adjustable stand attached to the vertical rocker of the nuclear reactor.

6. A loop according to patent claim 4, characterized in that the roller conveyor is supported by an adjustable stand attached to the bottom of the reactor basin.

7. A loop according to patent claim 1, characterized in that the device for fine-tuning the position of the test channel against the block stack comprises one. hydraulic jack.

8. A loop according to claim 1, characterized in that the device for fine adjustment of the bearing of the test channel against the block stack comprises one. mechanical control.

9.

Loop according to patent claim 2, characterized in that the heat exchanger consists of a bundle of forced cooling water circulation under the action of a pump. 19. A loop according to patent claim 2, characterized in that the heat exchanger comprises tubular elements, where the cooling water circulation takes place by natural convection flow. 20.

Loop according to claim 1 or 2, characterized in that it. The thermal insulation of the conduits in which cooling gas circulates is obtained by a liquid medium enclosed in a space between two coaxial tubes. 21.

12. A loop according to claim 1 or 2, characterized in that the irradiated materials are carried in a basket which is connected to a stopper closing the pre-duct. 22.

13. A loop according to patent claim 12, characterized in that the basket consists of four U-profiles in a cruciform arrangement and with the concave portion facing the center of the basket. 23.

Loop according to patent claim 12, Unsigned from the fact that the basket feeds the dog with the stopper through a quick-locking device.

15. A loop according to patent claim 14, characterized in that a quick-locking device. The sleeve comprises a sleeve connected to the basket, in which are arranged three, at present 1200 angular distances from each other arranged balls, which are inserted into recesses in a second sleeve connected to the basket, which is slidable in the first sleeve, with the aid of a third sleeve. , which abuts against a flange ph it. the first sleeve under the influence of a spring, the pimples of which abut against the third sleeve resp. against the plug. Request publications: