JPS618694A - Blanket element for fusion reactor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a plankent element of a fusion reactor blanket.

[Prior art] Recently, in a fusion reactor blanket made of lithium ceramic, an idea has been developed to increase the number of neutrons in the Planckent region and increase the amount of tritium multiplied from lithium by using beryllium oxide as a neutron multiplier. has been strongly advocated in fusion reactor design. However, as for how beryllium oxide should be arranged in the blanket part, a simple structure has been proposed in which, for example, beryllium oxide balls and lithium oxide balls are mixed and filled. If the flavors are not carefully arranged throughout the entire culm, lithium oxide or beryllium oxide may be unevenly distributed, which may cause problems in product calculations.

[Problems to be Solved by the Invention] Therefore, the prior art has a problem in that it is difficult to geometrically and calculatedly arrange beryllium oxide and lithium oxide in a blanket element.

[Invention to solve the problem is provided to surround the lithium ceramic of hollow cylindrical lithium ceramics and lithium ceramic from the outside for the purpose of solving the above problems promptly. a heat-resistant metal tube with a slit that reaches the ceramic;
The present invention provides a blanket element for a fusion reactor comprising a hollow burnt beryllium oxide skeleton inserted into the hollow portion of the lithium ceramic.

[Operation] Each member of the hollow cylindrical lithium ceramic, heat-resistant metal tube, and beryllium oxide sintered tube constituting the blanket element can be processed and inspected separately and then combined to form a plancare element. Therefore, each member can be processed to ensure the geometrical shape and arrangement as considered in the design.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view of a blanket element of a fusion reactor according to the present invention, and FIG. 2 is a front view of the blanket element of FIG. 1. As a blanket for a fusion reactor,
A large number of these Planckent elements may be combined.

In the embodiment, the sintered body or vibratory packing body (hereinafter referred to as lithium ceramic) 1 of lithium oxide, lithium aluminate, etc. has a hollow cylindrical shape with an outer diameter of 20 to 30 IAI11, and the periphery of the lithium ceramic 1 is 0.5 to 1.5 m thick made of heat-resistant metal such as stainless steel
It is surrounded by m cladding tubes 2. A heat-resistant metal is selected as the material for the cladding tube 2 in consideration of heat conductivity and reactivity with lithium ceramic. The cladding tube 2 is provided with a slit 3 that reaches the outer layer of the lithium ceramic 1 so that tritium generated within the lithium ceramic by neutron irradiation can be easily released to the outside of the blanket element. The slits 3 shown in FIG. 2 are elongated notches extending in the axial direction of the Plankent element, but the number, shape, direction of extension, etc. of the slits 3 may be arbitrary as long as they have the above-mentioned effect.

Although not shown, the upper and lower ends of the cladding tube 2 are sealed by welding end plugs thereto.

Placed in the hollow part of the lithium ceramic 1 is a beryllium oxide sintered tube 4 having a density of 75 to 90% TD (ratio to theoretical specific gravity) and an outer diameter of 5 to 10 mm, which is a neutron multiplier material. fulfill the role of Since beryllium oxide has many pores, tritium generated in the lithium ceramic 1 during operation can be released into the cavity 5 inside the beryllium oxide tube 4 through the pores. The issue of quantity of neutron multiplier material can be adjusted by appropriately selecting the density and wall thickness of the beryllium oxide tube 4.

[Effect of the invention 1 As described above, according to the present invention, each member of the hollow cylindrical lithium ceramic, the heat-resistant metal tube, and the aluminum oxide sintered tube constituting the blanket element was separately processed and inspected. Since they can be assembled into blanket elements afterward, each member can be processed to ensure the geometrical shape and arrangement as contemplated in the design, making it possible to easily carry out core design and thermal design. In addition, tritium generated from lithium ceramic is released from the heat-resistant metal tube with slits to the outside and from the holes in the hollow sintered aluminum tube to the central cavity, so tritium is almost never boiled off within the blanket element. do not have.

Furthermore, by flowing helium gas as a carrier gas through the outer surface and central cavity of the heat-resistant metal tube, not only can heat be removed reliably from the blanket element, but also the tritium carried by the helium gas can be recovered by a separate collection device. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a blanket element of a fusion reactor according to the invention, and FIG. 2 is a front view of the plankent element of FIG. 1... Lithium ceramic, 2... Heat-resistant metal tube, 3
...Slit, 4...Beryllium oxide hollow sintered tube,
5...Hollow. Patent applicant: Mitsubishi Atomic Crab Industry Co., Ltd.

Claims (1)

[Claims] A hollow cylindrical lithium ceramic, a heat-resistant metal tube surrounding the lithium ceramic from the outside and having a slit reaching the lithium ceramic, and a hollow sintered beryllium oxide tube inserted into the hollow part of the lithium ceramic. A blanket element of a fusion reactor consisting of.