beryllium pebble v - search results

Synthesis of Beryllium Pebbles Using Plasma Rotating ...

Beryllium is used as neutron multiplier in the form of a pebble bed. Basic characteristics of the beryllium pebbles are required to the design of blanket. From this point view, production methods and basic characteristics including particle morphology and mechanical properties of beryllium pebbles were investigated. The paper gives a brief description of fabrication technology for the Be pebbles.

European helium cooled pebble bed blanket: Design of ...

The helium-cooled pebble bed (HCPB) blanket for a fusion DEMO reactor is based on the use of separate small lithium orthosilicate and beryllium pebble beds placed between radial toroidal cooling plates. The cooling is provided by helium at 8 MPa. The tritium produced in the pebble beds is purged by the flow of helium at 0.1 MPa.

(PDF) Author's personal copy Analysis of tritium retention ...

A close-up OM image on the right shows details of the dendrite network. The 2 mm pebble is irradiated in HIDOBE-01 experiment at 923 K and then ramp annealed to 1173 K in the TPD experiment. Potential diagram of tritium in beryllium. A.V. Fedorov et al. / Journal of Nuclear Materials 442 (2013) S472-S477

Beryllium Research | NIOSH | CDC

In 2016, NIOSH began working on a project to evaluate prevalence of sensitization and CBD in workers of a new pebble plant that began operations in late 2011. Dermal Exposure and Sensitization Risk. In the 1950s, Curtis and co-workers demonstrated that beryllium-naïve research participants could be sensitized to beryllium by skin patch testing.

SECTION-BY-SECTION SUMMARY Subtitle A—Elimination of ...

Creates a new part V in subchapter E of chapter 1 of the Internal Revenue Code, effective for taxable years beginning after December 31, 2021: PART V—ELIMINATION OF DEFERRAL FOR APPLICABLE TAXPAYERS . Subpart A—General Provisions . Sec. 490. Elimination of deferral of tax for applicable taxpayers.

Optimization on producibility improvement and the ...

Generally, the multipliers are loaded as a pebble type with either single pebble packing with a single size (1 mm) or binary pebbles with large (2 mm) and small (0.5 mm) sizes to improve the packing fraction to higher than 80%, and beryllium and beryllides are reprocessed from beryllium powder and block as a raw material.

Application of Discrete Element Method to Study Mechanical ...

in Beryllium pebble beds, the highest and lowest value of temperatures are repeatable during cycles. The lowest temperature is close to the coolant temperature (350. o. C). Time (s) Δ. o. T(C) 0 1000 2000 3000 4000 5000 400 500 600 700 800. T. max. in solid breeder pebble bed …

(PDF) Current Status of Beryllium Materials for Fusion ...

beryllium pebble grades was performed in terms of their. microstructure and tritium rel ease properties. Th e results. are discussed with res pect to their applicatio n in fusion. blanket systems.

Thermal and mechanical properties of beryllium pebbles ...

Load curve of compression test for a neutron-irradi- ated beryllium pebble. room temperature. Pebble C is produced by mechanical cutting from a hot-pressed beryllium block. Pebble A was irradiated with a total fast neutron fluence (above 1.0 …

Synthesis of Beryllium Pebbles Using Plasma Rotating ...

Beryllium - Overview | Occupational Safety and Health ...

The element beryllium is a grey metal that is stronger than steel and lighter than aluminum. Its physical properties of great strength-to-weight, high melting point, excellent thermal stability and conductivity, reflectivity, and transparency to X-rays make it an essential material in the aerospace, telecommunications, information technology, defense, medical, and nuclear industries.

(PDF) Experimental Investigation and Analysis of the ...

The Helium Cooled Pebble Bed (HCPB) blanket, proposed by the European Community for a Demonstration Reactor (DEMO), is based on using ceramic breeder pebble beds and beryllium pebble beds as a neutron multiplier. Also, pebble beds have been suggested as a material form for the blanket of ITER (International Thermonuclear Experimental Reactor).

Development of materials and fabrication of porous and ...

The method designed (patent 2106931 RU) in SSC RF-VNIINM (Russia) provides for the production of porous beryllium conforming to the requirements mentioned above. For comparative fission tests and the optimization of breeding zone functional capabilities, porous (21.9%) and binary pebble bed (density=78%) beryllium multipliers were fabricated.

Defense Production Act Title III project establishes ...

WRIGHT-PATTERSON AIR FORCE BASE -- The U.S. lost its sole capability to manufacture high-purity beryllium metal when Materion Corporation (formerly Brush Engineered Materials, Inc.) decommissioned its beryllium reduction facility in Elmore, Ohio, in 2000. At the time, the closure was the result of several factors, including: equipment obsolescence, environmental operating …

Modeling of chemical reactions of beryllium/beryllide ...

Water-cooled pebble-bed (WCPB) blanket, in which beryllium/beryllide in a pebble form is used as neutron multiplier, is one of blanket concepts based on conventional or near-future technology for fusion DEMO. Combination of water, as coolant, and beryllium/beryllide, however, may pose a critical safety problem, i.e. the chemical reactivity of ...

Beryllium - Health Effects : OSH Answers

The beryllium-containing materials that Canadian industry commonly uses are the metal itself, beryllium oxide, and beryllium alloys. Industrial uses include the manufacture of thermal coating, nuclear reactors, rocket heat shields, brakes, x-ray tubes, and dental plates.

Mechanical compression tests of beryllium pebbles after ...

The beryllium pebbles with diameters of 1 and 2 mm were fabricated by NGK, Japan using the rotating electrode method (REM) .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 and mechanical tests are presented in Table 1.

Beryllium oxide | BeO - PubChem

Beryllium oxide is a beryllium molecular entity consisting of beryllium (+2 oxidation state) and oxide in the ratio 1:1. In the solid state, BeO adopts the hexagonal wurtzite structure form while in the vapour phase, it is present as discrete diatomic covalent molecules. It has a role as a carcinogenic agent.

Beryllium - Be

Beryllium as a chemical element occurs naturally in soils in small amounts, but human activities have also increased these beryllium levels. Beryllium is not likely to move deeper into the soil and dissolve within groundwater. In water, chemicals will react with beryllium, causing it to become insoluble. This is a good thing, because the water ...

JAERI-M 94-032

4. Thermal Properties of Beryllium Pebble 5 4.1 Thermal Expansion Coefficient 5 4.2 Specific Heat 5 5. Mechanical Properties of Beryllium Pebble 6 5.1 Collapse Test of Untreated Beryllium Pebble 6 5.2 Effects of Heating on Breaking Load 7 5.3 Effects of Compatibility with SUS316 on Breaking Load 8 5.4 Effects of Thermal Shock on Breaking Load 8 6.

Beryllium copper - Wikipedia

Beryllium copper (BeCu), also known as copper beryllium (CuBe), beryllium bronze and spring copper, is a copper alloy with 0.5–3% beryllium and sometimes other elements. Beryllium copper combines high strength with non-magnetic and non-sparking qualities. It has excellent metalworking, forming and machining properties.It has many specialized applications in tools for hazardous …

Development Document for Effluent Limitations Guidelines ...

----- PRIMARY BERYLLIUM SUBCATEGORY SECT - V BERYLLIUM PEBBLE PLANT AREA VENT WET AIR POLLUTION CONTROL The beryllium pebble plant contains a ventilation system for air circulation A wet scrubber is employed to clean the used air prior to venting to the atmosphere. Although the scrubber liquor is recycled extensively, a blowdown stream is ...

New insights into microstructure of irradiated beryllium ...

Chakin, V. P. & Ye Ostrovsky, Z. Evolution of beryllium microstructure under high-dose neutron irradiation. Journal of Nuclear Materials 307–311, 657–663 (2002). ADS Google Scholar

Investigation of Neutron-Irradiated Beryllium Pebble ...

Results: thermogravimetry TG/DTA shows an increase of mass which occurs due to the oxidation of beryllium in the presence of air and water moisture, ultimately leading to beryllium oxide formation. Most notably, neutron-irradiated pebbles in humid airflow exhibit a mass increase of almost 180%. Fig. 2.

Risks of beryllium disease related to work processes at a ...

Employees in the pebble plant (producing beryllium metal) who had been employed after 1983 also had increased risk, with a prevalence of beryllium disease of 6.4%, compared with 1.3% of other workers hired in the same period, and a prevalence of abnormal blood tests of 19.2%.

Berylliosis - NORD (National Organization for Rare Disorders)

Berylliosis is a form of metal poisoning caused by inhalation of beryllium dusts, vapors, or its compounds or implantation of the substance in the skin. The toxic effects of beryllium most commonly occur due to occupational exposure. Beryllium is a metallic element used in many industries, including electronics, high-technology ceramics, metals ...

Tritium breeding in a fusion--fission hybrid breeder ...

Uranium-233 is bred in thorium metal fuel elements which are in the form of snap rings attached to each beryllium pebble. Tritium is bred in lithium bearing material contained in tubes immersed in the pebble bed and is recovered by a purge flow of helium. The neutron wall load is 3 MW/m/sup 2/ and themore »

Simulations of threshold displacement in beryllium ...

V. A. Borodin and P. V. Vladimirov, " Molecular dynamics simulation of atomic displacement cascades in beryllium," in Proceedings of the 11th IEA International Workshop on Beryllium Technology ( KIT Scientific Publishing, 2013), p. 236.