beryllium pebble v

Blended beryllium and vanadium powders with the particle sizes less than 45 μm were used to fabricate Be–V rods. The purity of the beryllium and vanadium powders was 99.5 wt.% and 99.9 wt.%, respectively. ... Binary-sized Be 12 V pebble bed densified inside of the plexiglas container. Table 3 shows the values of the packing densities ...

DOI: 10.1016/S0920-3796(00)00272-6 Corpus ID: 121779096; Experimental investigations on the thermal and mechanical behaviour of a binary beryllium pebble bed …

Beryllium, in its pebble form, has been proposed in various blanket concepts to serve different purposes. Thermal property data for such a heterogeneous packed bed is needed, particularly data on ...

Abstract. Neutron multiplier materials are essential for self-sufficient tritium production and are closing the fuel cycle of fusion reactors. Until now, a concept of pebble bed consisting of interchanging layers of beryllium and lithium ceramic pebbles was considered for the Helium-Cooled Pebble Bed (HCPB) tritium-breeding module of the …

1. Introduction. In present ceramic breeder blankets, pebble-shaped beryllium is used as a multiplier. The candidate material Be-1 consists of fairly spherical pebbles with diameters of d ≈ 1 mm. Non-spherical beryllium particles can be produced much cheaper and, therefore, are of significant economic interest.There is a large …

Beryllium intermetallic compounds, Be 12 V, and Be 12 Ti 0.3 V 0.7 pebbles have been suggested as advanced neutron multipliers for the JA DEMO reactor. The authors verified the mechanical properties of these pebbles through compression tests for a single pebble at room temperature (RT) and high temperatures (600 and 800 K).

Conclusions. New results are presented for the thermal conductivity k of compressed beryllium pebble beds. The pebble beds consisted of 1 mm NGK pebbles and are representative for dense pebble beds (packing factors γ ≈ 63.5%). Measurements were performed for mean temperatures T between 200 and 650 °C, and maximum …

The beryllium pebbles with diameters of 1 and 2 mm were fabricated by NGK, Japan using the rotating electrode method (REM) [5].The HIDOBE-01 irradiation campaign was in the HFR on 2005–2007. The compression tests included mechanical loading of a single pebble at a constant loading value during 80 h.The parameters of the irradiation …

Introduction. In the European helium-cooled pebble bed (HCPB) blanket of a DEMO (DEMOnstration fusion power plant) beryllium pebbles with 1 mm diameter are planned to be used as a neutron multiplier [1].Fusion neutron irradiation causes formation of radiogenic gases in beryllium, in particular, about 20,000 appm of helium can be …

1.. IntroductionFor the next generation fusion reactors with a ceramic breeder blanket, the use as a neutron multiplier of either a binary bed of large (φ≈2 mm) and small (φ≈0.1–0.2 mm) beryllium pebbles or a single size bed made of 1 or 2 mm pebbles is foreseen.The heat transfer parameters and pressure exerted on the containment walls of …

Research on beryllium intermetallic compounds (beryllides (Be 12 V)) has been conducted, and the authors have successfully fabricated Be 12 V and Be 12 Ti 0.3 …

Photographs of the appearance (a) and cross-section (b) of the Be 12 V pebble after conducting the hydrogen generation experiment. These results illustrate …

Beryllium is considered to be a neutron multiplier material for the reference ITER breeding blanket. The main requirements for the porous beryllium multiplier for the breeding blanket are: (1) inherently open porosity within 20. ± 2% for easy removal of radioactive gases; (2) high thermal conductivity; (3) close contact with a stainless steel …

Abstract. The effective thermal conductivity of pebble beds is an important parameter for the thermomechanical design of solid breeder blankets operating at temperatures of up to 900 °C in breeder pebble beds and up to 700 °C in beryllium pebble beds. Compressive stresses and creep might cause significant pebble deformations.

Section snippets Experimental. The beryllium pebbles with diameters of 1 and 2 mm were fabricated by NGK, Japan using the rotating electrode method (REM) [5].The HIDOBE-01 irradiation campaign was in the HFR on 2005–2007. The compression tests included mechanical loading of a single pebble at a constant loading value during 80 …

The beryllium thermal conductivity is determining the maximum pebble bed temperature and, therefore, is very important for blanket design. Different grades of beryllium discs were neutron-irradiated at temperatures between 343 and 673 K and at fluences up to 1.6 × 10 23 cm −2. At lower irradiation temperatures a significant drop of …

In the helium cooled pebble bed (HCPB) blanket for fusion power reactors [1] the neutron multiplier and the breeder material are arranged in pebble beds between flat cooling plates. The maximum temperatures in the breeder and beryllium pebble beds are about 900 and 650 °C respectively. Because of temperature differences and different …

The current helium cooled pebble bed (HCPB) tritium breeding blanket concept for fusion reactors includes a bed of 1 mm diameter beryllium pebbles to act as a neutron multiplier.

In this investigation, a thermo-mechanical model of pebble beds is adopted and developed based on experiments by Dr. Reimann at Forschungszentrum Karlsruhe (FZK). The framework of the present material model is composed of a non-linear elastic law, the Drucker-Prager-Cap theory, and a modified creep law. Furthermore, the volumetric …

The heat transfer parameters of such a binary pebble bed, namely the thermal conductivity and the heat transfer coefficient to the containing wall, have been investigated in the experimental devices PEHTRA and SUPERPEHTRA and have been reported in the companion paper at this workshop. 1 In the present paper the results of …

Materion Natural Resources – Mining Beryllium. Topaz-Spor Mountain area in western Utah has been a commercial source of uranium and fluorspar. Beryllium was discovered …

The A-HCPB blanket (see Fig. 1, Fig. 2) exhibits the same basic design features as the European DEMO-HCPB blanket, which is based on the use of separate ceramic breeder and beryllium pebble beds placed between cooling plates.The separation between breeder and multiplier in form of a pebble bed is necessary to avoid chemical …

Oxidation of beryllium pebble external surfaces is accompanied by partial destruction of oxide layers owing to their high brittleness. Strong interactions between …

Beryllium pebble behaviour has been studied regarding the accidental operation conditions of tritium breeding blanket of fusion reactors. Structure evolution, oxidation and thermal properties have been compared for nonirradiated and neutron irradiated beryllium pebbles during thermal treatment in a temperature range from …

For beryllium pebble beds, no data existed at all. An overview on the status of the pebble bed work is given in [4]. In this article, further results from UCTs are presented for different ceramics. Additionally, stress/strain and thermal creep data for beryllium pebble beds are reported, obtained in a separate UCT facility.

Microstructure of as received beryllium. The typical microstructure of 1 mm beryllium pebbles produced by rotating …

DOI: 10.1016/0022-3115(94)90960-1 Corpus ID: 93045969; Heat transfer and technological investigations on mixed beds of beryllium and Li4SiO4 pebbles @article{Donne1994HeatTA, title={Heat transfer and technological investigations on mixed beds of beryllium and Li4SiO4 pebbles}, author={Mario Dalle Donne and Aniceto …

Beryllium pebble Neutron irradiation a b s t r a c t heliumof releasetritium and mm after high-from beryllium pebbles with diameters of 0.5 1 dose neutron irradiation at …

Beryllium in form of pebbles with diameter of about 1 mm is foreseen as neutron multiplier in the European helium cooled pebble bed (HCPB) blanket for fusion power plants. The pebbles are arranged ...

Beryllium. jednotky SI a STP (25 °C, 100 kPa). Beryllium (chemická značka Be, latinsky Beryllium) někdy také berylium, je nejlehčím z řady kovů alkalických zemin, tvrdý, šedý kov o značně vysoké teplotě tání. Velmi dobře propouští rentgenové záření a ionizující záření gama. Beryllium a jeho soli jsou mimořádně ...

Three different container types with beryllium pebbles were used in the HIDOBE-01 (HIgh DOse irradiation of BE) experiment at the HFR (High Flux Reactor), Petten (Fig. 1) [4], [5].Two of them have been made as small constrained pebble beds which contain 0.5, 1, and 2 mm pebbles located in various sections on height (Fig. 1 a …

Numerically investigation of the neutron irradiation swelling on the mechanical and structural evolution of beryllium pebble bed @article{Xi2023NumericallyIO, title={Numerically investigation of the neutron irradiation swelling on the mechanical and structural evolution of beryllium pebble bed}, author={Weibin Xi and Qigang Wu and …