DE1514629A1 - Nuclear reactor with pressure chamber - Google Patents

Description

465372.6. . Augsburg, December 2nd, 1965

G Priority: Luxembourg

'■ "■■■■ · December 4, 1964

■ 15U6-29 ^{No. 4?}

Dipl.-ing.

kBusselmeler Ρα, -ian'.valt patent application

g rottenau

Dr. Expl.

Societe An.qlo-Belffe Vulcain, 331 des Colonies, Bruxelles, Belgium

Nuclear reactor with pressure chamber

The invention relates to nuclear reactors which have a pressure chamber and in which the reactor core is cooled by a fluid which is partly or wholly during at least part of its cycle in the liquid state is located.

The invention relates in particular to nuclear reactors, in which the pressure chamber is built into the pressure vessel that contains the reactor core.

The invention consists in a nuclear reactor with a pressure chamber, characterized in that. that this Element that forms the lower section of the pressure chamber that carries the elements of the reactor core.

In this way a transfiguration is obtained. s Pressure loss, which with Ccc l_reislaui of the coolant connected in the reactor by the

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all or most of the fluid no longer traverses the support plate of the core got to.

The lower portion of the pressure chamber can also be pierced to contain a portion of the fluid that has passed through the core.

The lower section of the pressure chamber can be two separate Have plates, of which at least the lower plate is perforated, »with a device is provided to the space between the panels to feed the core coolant while the reactor is being reinserted.

The invention is illustrated schematically below on the basis of hand Drawings explained in more detail using an exemplary embodiment.

Fig. 1 shows a vertical partial section in a nuclear reactor according to the invention, and

FIGS. 2 and 3 show enlarged views of excerpts from FIG. 1, each showing one of clarify two phases of assembly.

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If you now turn to the drawings, show this a nuclear reactor, in which pressurized water both as a moderator and as a coolant for the Reactor is used. This reactor has a pressure vessel 1 in which a fuel element 3 (from which only one is shown) provided reactor core 2 is arranged, which by the pressurized water must be cooled. The water is under

Pressure put to the boiling of the water in the core 2 |

to control; For this purpose, a pressure chamber 4 is provided, in which a pressure medium, for example a gas or steam, must be enclosed and which transmits its pressure to the pressurized water. The pressure chamber 4 has the shape of a cylindrical vessel 5 having two Spacer "arranged base plates 6 and 7 · This Plattend and · 7 have aligned openings 8 and 9 for the fuel assemblies to, and have all the openings 8 · an upper flared portion 10 .. '

Each fuel assembly 3 constitutes an aggregate of nuclear fuel in the form of a certain number of sheathed rods 11, which are parallel to each other and spaced by their ends supporting grids (of which the upper grid is shown and is provided with the reference number 12) and through

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intermediate spacer grids, not shown, are held; the aggregate of, rods is arranged in a line piece or jacket 13. At its upper end, this jacket has 13 ribs 14 (only one of which is shown., . represents), with an attachment to one, coaxial

align support member I5 is made. This

Support member I5 is part of a locking mechanism. represents, by means of which the fuel assembly 3 ^at the

Base plate of the pressure chamber 4 is suspended. Each locking mechanism has a movable organ in it Shape of a frustoconical stopper l6 with a rod I7, which is provided with a thread on its outer surface, so that this piece with a with an internally threaded cap at the upper end l8 of the support chamber I5 and with a internally threaded cap at end 19 as well as with a deformable sleeve 20 together

) can act, which has three equidistant grooves 21

(only one of which is shown) which extend longitudinally. The stopper l6 has a hexagonal head 22 with a conical guide projection 23 and is designed with an end face 24

t det that is useful when lifting. The support member I5 has a cylindrical shape with recessed openings 25, an outer locating flange 26 having a groove 27 for receiving one of the

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Plate 7 carried rod 28; and a bottom cap at the 2nd% end with an atomizing nozzle 30.

Between the vessel 1 and the core 2 there is a shielding ring and between the vessel 1 and the A guide wall or baffle wall is arranged in the pressure chamber 4. The pressure chamber 4 has a supply · »· tube 33 and tubes 34 for controlling and locking on, which extend across the pressure chamber '. The plates 6 and 7 and limit the side walls between them a vessel or a collecting chamber 35 The coolant passes upwards across the Core in the channels that the fuel rods 11 form between them, and from there across the not illustrated heat exchanger in the vessel 1, passing through the openings 36, which are in the Section of the plate 7 are formed between the baffle or guide wall and the pressure chamber 4 is located. Each coat has I3 on his lower end of a central rod, not shown, which forms an approach and below into a corresponding hole in a lower plate, not shown, for position determination the core extends; in this way the determination of the position of the core and any transverse movement is achieved prevented because axial expansion of the core is allowed.

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During the assembly of the reactor core 2, the fuel assemblies 3 are arranged in such a way that the shells 13 are supported on the lower orientation plate of the core and the central cores, which are supported on the lower ends of the shells, form extensions into the bores which are formed in the lower positioning plates for the core accordingly. The Dinckkammer 4 is then brought into place in the container 1, the dimensions of the locking mechanisms mounted on the fuel assemblies 3 being chosen so that the plates. 6 and 7 move into the position shown in Fig. 2 above the locking mechanisms, i. H,. with an arrangement of the rods 28 in the recesses 27, the organs 15 protruding into the openings 8 and the hexagonal heads 22 being accessible in the section which lies above the plate 6. Jaws yi of a remote control tool are used to grip each head 22 by its periphery and locate it below the lifting surface 24t. The remote control tool raises the fuel assembly until the flange 26 comes into contact with the lower surface of the plate 7. The jaws 31 ″ which support the head 22 are set in rotation; the result is that the one provided on its outside with a thread

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Rod I7 penetrates even more into the upper cover l8, which is provided with an inner thread, until the cover at the lower end I9 comes to rest on the cover at the upper end l8. A further rotation of the head 22 then causes the plug 16 to penetrate the socket 20 and deform it; this creates an engagement of the plug 16, the sleeve 20 and the section 10, in which the fuel assembly 3 is locked or retained on the plate 6, as shown in FIG. The base plate 6 of the pressure chamber k thus serves as an upper support plate of the core, from where the fuel assemblies 3 of the core 2 are suspended by the locking mechanism; that way will

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the assembly of the reactor core is facilitated and the difficulties caused by Pressure loss of the coolant could occur.

The rods are in the position shown in FIG. 3 17 released from the lids 19; in this way lifting of the plugs 16 during fuel reintroduction operations is facilitated during the collector 35 receives an auxiliary coolant that passes through the openings 25 and the lines 30, to be dusted onto the fuel assemblies 3.

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Claims (3)

- δ - December 2, 1965 t, "15U629 patent claims 1. Nuclear reactor with pressure chamber, characterized in that the lower Section of the "element forming the pressure chamber" carries the elements of the reactor core. P. 2. Nuclear reactor according to claim i, _t thereby ge - indicates that the lower down, cut of the pressure chamber pierced or perforated is to pass a portion of the fluid that has passed through the core. 3. Nuclear reactor according to claim 1 oder.2, characterized in that the lower Section of the pressure chamber contains two separate plates, of which at least the lower plate is perforated, means being provided around the space between the plates during the reintroduction of the reactor with cooling liquid for feed the core. 909819/0718