WO2002061761A1 - Bloc reflecteur pour reacteur a haute temperature - Google Patents

Bloc reflecteur pour reacteur a haute temperature Download PDF

Info

Publication number
WO2002061761A1
WO2002061761A1 PCT/DE2002/000068 DE0200068W WO02061761A1 WO 2002061761 A1 WO2002061761 A1 WO 2002061761A1 DE 0200068 W DE0200068 W DE 0200068W WO 02061761 A1 WO02061761 A1 WO 02061761A1
Authority
WO
WIPO (PCT)
Prior art keywords
reflector
groove
horizontal
blocks
tongue
Prior art date
Application number
PCT/DE2002/000068
Other languages
German (de)
English (en)
Inventor
Heiko Barnert
Jasbir Singh
Original Assignee
Forschungszentrum Jülich GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forschungszentrum Jülich GmbH filed Critical Forschungszentrum Jülich GmbH
Publication of WO2002061761A1 publication Critical patent/WO2002061761A1/fr

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C11/00—Shielding structurally associated with the reactor
    • G21C11/06—Reflecting shields, i.e. for minimising loss of neutrons
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a high-temperature reactor (HTR), in particular the side reflector of such an HTR, comprising individual reflector blocks.
  • HTR high-temperature reactor
  • HTTR high temperature test reactor
  • the reflector blocks surrounding the in-core components are geometrically adapted to the hexagonal graphite blocks.
  • Eight individual permanent reflector blocks are arranged in vertical columns, the entire circumference being formed by 12 columns.
  • Horizontal and vertical springs on the outside of the permanent reflector blocks serve to position the individual blocks against each other.
  • the permanent reflector blocks have horizontal and vertical sealing elements on the outside, which serve to limit leakage flows.
  • HTR high temperature pebble-bed reactor
  • These ceramic internals include the side reflector, comprising an inner and an outer reflector ring wall.
  • Several reflector blocks placed flush on top of one another and held in mutual positioning by dowels in the base areas form a column.
  • Several columns placed side by side form the ring walls of the side reflector.
  • the individual reflector blocks of the columns of the inner ring wall are connected to one another by so-called wedges, of the same height as the reflector blocks.
  • the function of these wedges are tongues and grooves.
  • the inner ring wall is mainly used for the reflection of neutrons, the outer one is mainly used for thermal insulation.
  • the mechanical forces from the filling with spherical fuel elements are transferred directly from the pillars to a metal circumferential wall (called a thermal shield for the THTR).
  • the columns are regularly set up in such a way that a gap, also called a column gap, remains between every two columns in all operating states.
  • the column gaps are closed by wedges in the groove system, as a result of which the leakage current through the column gaps is limited to an admissible level.
  • the leakage flow through the horizontal joints between the layers of the reflector blocks is limited to a permissible level by the joints of the reflector blocks standing on top of one another according to the prior art.
  • a disadvantage in this construction of a HTR is that an unexpected decrease in temperature by measuring comparable ⁇ > different temperatures was found in the individual holes of the side reflector in the commissioning phase of the THTR.
  • three bypass mass flows of a total of 7% of the cooling mass flow at the core outlet are regarded as justification, as in the dissertation: Jürgen Hoffmann, "Plant simulation of the THTR-300 using the example of recorded start-up attempts", RWTH Aachen, day of the oral Test: May 11, 1990.
  • the temperature measurements of the THTR indicated only three altitudes, in which a horizontal gap gap occurred. This indeterminacy is based on the fact that the individual reflector blocks of each column are not individually guided, but are mainly lying on top of one another due to their mass and fixed by dowels.
  • the object of the invention is to provide a simpler structure for a side reflector of a high-temperature reactor (HTR) than is known from the prior art, which also largely prevents leakage currents. Furthermore, it is the object of the invention to meet special conditions from the application for a helium turbine process with regard to loads from larger pressure differences and pressure transients The object is achieved by a side reflector with individual reflector blocks, a single reflector block comprising the entirety of the features according to claim 1. Advantageous embodiments of the reflector block according to the invention result from the related claims.
  • the reflector block for a high temperature reactor according to claim 1 comprises at least one vertical groove
  • a groove is to be understood as an elongated recess in the surface for receiving additional construction parts by counterparts corresponding to the groove, such as wedges or springs (tongue and groove system).
  • it is a recess with a rectangular profile, which is formed over the entire height of the side surfaces (vertical end face) of the reflector block.
  • the reflector block according to the invention also has at least one further horizontal groove.
  • This horizontal groove is advantageously formed over the entire width (horizontal face) of the reflector block.
  • the reflector block has a horizontal groove on the upper and lower end faces.
  • a further advantageous embodiment according to claim 4 provides that the vertical groove, or the vertical grooves, and the horizontal groove, or grooves lie in one plane. Especially for a block where two side faces (vertical end faces) and grooves are formed on the two base faces (horizontal end faces), this configuration advantageously leads to a circumferential notch.
  • a further special embodiment according to claim 5 provides for the dimensions of the vertical and horizontal grooves to be dimensioned similarly.
  • the Klaff gaps that form are geometrically closed, the leakage flow is limited to an acceptable level by means of appropriate fit tolerances, and the closure of the Klaff gaps is allowed without hindrance when the normal operating temperature gradients disappear.
  • a suitable fit tolerance to meet the two aforementioned requirements is, for example, the fit tolerance class "mobility with plenty of play".
  • the tongue and groove system in the horizontal joints is similar to the tongue and groove system in the column gaps known from the prior art.
  • the difference is in the first mentioned system in the mecha- nik the formation and closure of the gap gap, which requires a fit with a larger game than the latter.
  • the boundary condition applies that the functions of both systems do not interfere with each other. This is achieved through appropriate shaping.
  • FIG. 1 Inner side reflector of a high temperature reactor (HTR) with a vertical tongue and groove system according to the prior art (the arrangement of the dowels has been omitted)
  • Figure 2 Formation of gaping horizontal gaps
  • FIG. 3 Inner side reflector of a high-temperature reactor (HTR) with an additional horizontal
  • Embodiment 1 Inner side reflector of an HTR
  • Embodiment 2 outer side reflector of an HTR
  • FIG. 8 Embodiment 3: inner side reflector of an HTR.
  • FIG. 1 shows part of the inner ring wall of a side reflector for a high-temperature reactor, comprising four reflector blocks 1 a, 1 b, 2 a, 2 b.
  • Blocks la and 2a like blocks lb and 2b, are arranged as a column, the individual blocks being fixed flush with one another by dowels (not shown in FIG. 1). Due to the design, there is a column 9 between the columns. This gap takes into account the fact that the reflector blocks expand when the temperature rises. This effect is partially absorbed by the gap 9.
  • the individual blocks have vertical grooves 10 on each of two opposite side faces (vertical end faces).
  • the grooves are arranged in such a way that the grooves complement one another in a type of guide in the case of two adjacent blocks.
  • This tongue and groove system serves in particular to seal the gaps 9 between the individual blocks of a reflector wall. This design corresponds to the state of the art for both the inner and the outer side reflector wall of a high-temperature reactor.
  • FIG. 2 explains the effect that individual gaping gaps arise in a few layers of blocks of the reflector wall.
  • Figure 2a is a reflector column with the Blocks 1 to 7 shown in section, namely in the installed state, or for conditions of constant temperature.
  • the blocks are mutually fixed and positioned vertically by dowels.
  • the vertical tongue and groove system is used for sealing.
  • FIG. 2b shows the same reflector column under normal operating conditions. Inside, ie towards the ball core, the temperatures are higher. This applies both to the outer reflector wall, the function of which is the insulation, and to the inner reflector wall.
  • the higher temperature leads to greater thermal expansions on the inside of the reflector wall compared to the outside. This would lead to a bending of the reflector column to the outside if it were installed freely.
  • FIG. 2 b shows the formation of a gap gap 12 between the blocks 4 and 5 in a greatly exaggerated manner. As a result, they lie edge-on-edge and are arranged slightly tilted relative to the tilting edge 13. Such gap gaps regularly result in large leakage currents, which have a disadvantageous effect on the operation of the reactor. This should definitely be avoided.
  • FIG. 3 shows, similarly to FIG. 1, part of a side reflector for a high-temperature reactor, comprising four reflector blocks 1 a, 1 b, 2 a, 2 b. Furthermore, the column gap 9 between two reflector columns and a vertical spring (wedge) 11 are shown. According to the invention, the reflector blocks now additionally have horizontal grooves 15 and 17, respectively.
  • the geometrically precisely fitting horizontal springs 14 serve as a seal for the grooves 15 and 17. They form the tongue and groove system in the horizontal joints. With the tongue and groove system, it is arranged in a functionally coordinated manner in the column columns.
  • the gap gap 12 is closed by springs 14 which lie in the grooves 15 (in reflector block 1a) and 16 (in reflector block 1b) and 17 (in reflector block 2a) and 18 (in reflector block 2b).
  • This tongue and groove system is advantageously arranged in the horizontal joints so that it lies in the same plane as the tongue and groove system in the column gaps. This results in a circumferential groove in the individual reflector blocks.
  • Appropriate dimensions of the two tongue and groove systems ensure that the mating surfaces, which function here as sealing surfaces yaw, the two systems merge. The arrangement ensures that columns are closed to a maximum.
  • Figures 4 and 5 show advantageous arrangements of the two tongue and groove systems based on different sectional drawings.
  • the required qualities of the fit clearance namely a relatively large clearance for the tongue and groove system in the horizontal joints 15, 16, 17 and 18 with tongue 14, are at relative small play for the tongue and groove system in the vertical grooves 10 with the tongue 11 can be achieved.
  • FIG. 4 shows an arrangement with a "continuous" spring 14, ie the spring 14 covers the column gap 9 in that it lies in the grooves of two columns a and b.
  • This arrangement is advantageous because the greatest geometric coverage of possible gap gaps is achieved and the possible displacement of the spring 11 for each spring 11 is prevented individually by the spring 14 by positive locking.
  • Figure 5 :
  • FIG. 5 shows an arrangement with a “non-continuous” spring 14, which also achieves the object on which the invention is based and which fulfills the requirements set therein.
  • Reflector block and tongue and groove systems in the horizontal joints for the inner wall of the side reflector are Reflector block and tongue and groove systems in the horizontal joints for the inner wall of the side reflector.
  • the reflector blocks 1a and 2a represent a left column
  • reflector blocks 1b and 2b represent a right column (viewed from the inside).
  • the column gap 9 This is closed by springs 11, which lie in the associated grooves 10.
  • the positioning of the reflector blocks in the columns and the columns in the base plate and in the cover plate takes place by means of the dowels 19, which together with the circular depressions in the base surfaces (the upper and lower) of the reflector blocks functionally designate a spring - Show grooves system.
  • the bore 20 regularly receives a reflector rod sleeve and serves the function of switching off. Up to this point, this paragraph describes the state of the art.
  • the gap gap 12 is formed by rotating individual blocks around the tilting edge 13.
  • the corresponding layers, lower layer, represented by reflector blocks 1a and 1b and upper layer, represented by reflector blocks 2a and 2b, are after relative rotation around the tilting edge 13 Corner on corner.
  • the gap gap 12 is closed by spring 14 concluded.
  • the associated halves of the groove are marked with 15, 16, 17 and 18.
  • the functional dimensions and fit of the tongue and groove system in the horizontal joints 15-18 are e.g. B. 60 mm, H7 / e7 or e8, which sets a larger game than the tongue and groove system 11/10 in the column columns 9 with, for example, 60 mm, H7 / f7.
  • the longitudinal dimension of the spring 14 is selected such that it advantageously spans two adjacent columns, with which a maximum gap closure is achieved.
  • Reflector block and tongue and groove systems in the horizontal joints for the outer wall of the side reflector are Reflector block and tongue and groove systems in the horizontal joints for the outer wall of the side reflector.
  • FIG. 7 shows a second exemplary embodiment, which is almost identical to exemplary embodiment 1.
  • the difference lies in the spring 14, which is divided into two in this second exemplary embodiment (14a and 14b).
  • the shape of the reflector block for the outer wall is correspondingly represented, represented by reflector block la.
  • the associated horizontal grooves are angled.
  • the dowel 22 serves for the vertical positioning of the reflector blocks of the outer wall, similar to dowels 19 for those of the inner wall.
  • Inner wall with tongue and groove system in the horizontal joints in an interrupted arrangement in contrast to the two previous embodiments with continuous arrangement.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

L'invention concerne un bloc réflecteur destiné à un réacteur à lit de boulets à haute température, comprenant au moins une rainure verticale (10) dans laquelle vient se loger une languette (11) et au moins une rainure horizontale (15, 17) qui s'étend sur la face de base supérieure et/ou inférieure. Selon l'invention, il s'avère que l'utilisation d'un système à rainure et languette dans tous les joints horizontaux des parois annulaires interne et externe du réflecteur latéral permet de réduire les fuites. Les blocs selon l'invention constituent avec des joints horizontaux et des languettes parfaitement adaptées à ceux-ci ce que l'on appelle un système d'étanchéité anti-bâillement. Grâce à une forme adaptée, les fentes de bâillement qui apparaissent peuvent être géométriquement obturées, les fuites peuvent être limitées à un niveau admissible au moyen de tolérances d'ajustement adaptées et la fente de bâillement peut être facilement obturée lorsque les gradients de température de fonctionnement normal disparaissent. Une tolérance d'ajustement adaptée permettant de répondre aux deux exigences susmentionnées appartient par exemple à la catégorie de tolérances d'ajustement 'mobilité avec large jeu'.
PCT/DE2002/000068 2001-02-01 2002-01-11 Bloc reflecteur pour reacteur a haute temperature WO2002061761A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10104404A DE10104404C1 (de) 2001-02-01 2001-02-01 Reflektorblock für Hochtemperaturreaktor
DE10104404.6 2001-02-01

Publications (1)

Publication Number Publication Date
WO2002061761A1 true WO2002061761A1 (fr) 2002-08-08

Family

ID=7672405

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/000068 WO2002061761A1 (fr) 2001-02-01 2002-01-11 Bloc reflecteur pour reacteur a haute temperature

Country Status (3)

Country Link
DE (1) DE10104404C1 (fr)
WO (1) WO2002061761A1 (fr)
ZA (1) ZA200306759B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103871486A (zh) * 2014-02-24 2014-06-18 清华大学 一种限制高温气冷堆石墨堆芯结构位移的箍紧带结构
RU2562617C2 (ru) * 2010-06-04 2015-09-10 Пеббл Бед Модулар Риэктор Сок Лтд Сборка блока отражателя нейтронов, боковой отражатель ядерного реактора и ядерный реактор

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199405A (en) * 1976-09-25 1980-04-22 Hochtemperatur-Kernkraftwerk Gmbh (Hkg) Gemeinsames Europaisches Unternehman Side reflector for a high-temperature nuclear reactor
US4923670A (en) * 1986-12-03 1990-05-08 Hochtemperatur-Reaktorbau Gmbh Roof reflector for a nuclear reactor
JPH02243993A (ja) * 1990-01-10 1990-09-28 Fuji Electric Co Ltd ガス冷却型原子炉の高温プレナムブロツク
US5017333A (en) * 1989-02-08 1991-05-21 Japan Atomic Power Co., Ltd. Multi-region reactor core pebble bed high temperature gas reactor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199405A (en) * 1976-09-25 1980-04-22 Hochtemperatur-Kernkraftwerk Gmbh (Hkg) Gemeinsames Europaisches Unternehman Side reflector for a high-temperature nuclear reactor
US4923670A (en) * 1986-12-03 1990-05-08 Hochtemperatur-Reaktorbau Gmbh Roof reflector for a nuclear reactor
US5017333A (en) * 1989-02-08 1991-05-21 Japan Atomic Power Co., Ltd. Multi-region reactor core pebble bed high temperature gas reactor
JPH02243993A (ja) * 1990-01-10 1990-09-28 Fuji Electric Co Ltd ガス冷却型原子炉の高温プレナムブロツク

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 565 17 December 1990 (1990-12-17) *
S. MARUYAMA ET AL.: "Construction of the HTTR in-core components", JAERI CONFERENCE 1996, pages 161 - 176, XP001071111 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2562617C2 (ru) * 2010-06-04 2015-09-10 Пеббл Бед Модулар Риэктор Сок Лтд Сборка блока отражателя нейтронов, боковой отражатель ядерного реактора и ядерный реактор
CN103871486A (zh) * 2014-02-24 2014-06-18 清华大学 一种限制高温气冷堆石墨堆芯结构位移的箍紧带结构
CN103871486B (zh) * 2014-02-24 2016-08-17 清华大学 一种限制高温气冷堆石墨堆芯结构位移的箍紧带结构

Also Published As

Publication number Publication date
ZA200306759B (en) 2004-09-08
DE10104404C1 (de) 2002-04-11

Similar Documents

Publication Publication Date Title
DE1110771B (de) Brennstoffelement-Einheit fuer Kernreaktoren
DE2450143A1 (de) Kernreaktor-behaeltergefaess
DE3100039C2 (de) Vorrichtung zur Befestigung eines Kopfflansches im Gehäuse einer Turbomaschine
DE102006004613A1 (de) Gasturbine, die eine Abdichtstruktur aufweist
DE69306138T2 (de) Abstandshalterlamelle mit optimal gestaltetem Abstand zwischen Brennstabbündel und Kasten in einem Siedewasserreaktor
DE2710859A1 (de) Verschlussvorrichtung fuer grosse oeffnungen in druckbehaeltern
DE1564029C3 (de) Bauteil zum Aufbau eines thermischen Reaktorkernes
DE2354540C2 (de) Zwischen dem thermischen Schild und dem Kern eines Reaktors eingefügter Reflektor
DE2752045A1 (de) Reaktordruckbehaelter-unterstuetzung
DE2643275C2 (de) Seitenreflektor fuer hochtemperatur- kernreaktoren
DE2522263C2 (de) Kolbenringartige Segmentdichtung
DE2404171A1 (de) Druckbehaelter fuer kernreaktoren mit betonhuelle
DE69107731T2 (de) Kernumfassung für Kernreaktor.
WO2002061761A1 (fr) Bloc reflecteur pour reacteur a haute temperature
DE1261606B (de) Zwischen dem thermischen Schild und dem Kern eines Atomkernreaktors eingefuegter Reflektor
DE1930508B2 (de) Wassergekuehlter rotor eines turbogenerators
DE2525410C2 (de) Tragkonstruktion für die seitliche Neutronenabschirmung eines Kernreaktorkerns
DE2817541C2 (de) Verfahren zum Aus- und Einbau des Seitenreflektors eines Hochtemperaturreaktors
DE3042552A1 (de) Seitenreflektor fuer eine gasgekuehlte kernreaktoranlage
DE2519439A1 (de) Waermeisolationsschicht fuer einen kernreaktor
DE3641284C2 (fr)
DE3826508A1 (de) Auflagerung einer axial fixierten dampfturbine
DE2644516A1 (de) Kernreaktor
DE3601750A1 (de) Keramische einbauten
EP2240117A2 (fr) Plan de cuisson pour un four

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US ZA

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2003/06759

Country of ref document: ZA

Ref document number: 200306759

Country of ref document: ZA

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Ref document number: JP