state and local governments Although a small portion of this report is not reproducible it is to accurately control weld coollng rate and pool shape ductlon melting of either beryllium scrap or pebble bottom pouring and directionally so-lidifying the Ingot (13} The vacuum induc- Beryllium is a naturally occurring element that is extracted from ores and processed into metal oxides alloys and composite materials Industrial use of beryllium such as machining metal parts can lead to BeS and CBD () The major applications of beryllium are in automotive electronics telecommunications computers aerospace and defense equipment ()

Petition to OSHA to Lower Occupational Exposure to Beryllium

Beryllium alloys are also very hard and light Beryllium oxide is resistant to corrosion and high temperatures Beryllium and its compounds are commonly used in ceramics aircraft parts dental prostheses golf clubs missile guidance systems springs wheels and precision instruments Beryllium exposure occurs when in the process of producing

Beryllium exposure can cause a granulomatous lung disease in workers who develop a lymphocyte-mediated sensitization to the metal Workers in diverse industries are at risk because beryllium's properties are critical to nuclear aerospace telecommunications electronic metal alloy biomedical and semiconductor industries The occupational air concentration standard's

Preliminary and final studies are reported for the worth of tubular control rods in a beryllium oxide moderated pebble bed reactor system In the preliminary study the consideration of ball flow forces the investigation of a number of control rod arrangements In addition a range of rod sizes is considered

A GUIDE TO DESIGNING AND FABRICATING WITH BERYLLIUM An introductory guide to the physical and mechanical properties material selection and Primary beryllium is produced as "pebble" by the magne-sium reduction of anhydrous beryllium fluoride The Through control of chemical composition particle size distribution and temperature

Jan 09 2017OSHA reviewed the findings and recommendations contained in the Criteria Document along with the AEC control requirements for beryllium exposure OSHA also considered existing data from animal and epidemiological studies and studies of industrial processes of beryllium extraction refinement fabrication and machining

Estimation of the probability of finite percolation in

beryllium beds resp porosity networks characterization see [11 14] The sample is a 2mm diameter beryllium pebble with grain sizes comprised between 40 and 150m which had been neutron irradiated at 770K thus producing through a (n 2n)-reaction 480appm Helium and 12appm Tritium in the beryllium matrix and 5

RDs on Li2TiO3 Pebble Bed for Test Blanket Module in JAEA H Tanigawa T Hoshino Y Kawamura M Nakamichi K Ochiai M Akiba M Ando and Beryllium (Be) are our first candidates This paper presents the key achievements of the In order to control

the Beryllium pebble beds Advantages : 1 Combination of high flow rate in FW/multiplier region with low flow rate in the large central channel results in effective cooling of FW and beryllium pebble beds and at the same time in maximised coolant exit temperatures 2 Flow rate through the pebble bed about a factor of three larger than

L Huddar P F Peterson R Scarlat Z Guo Experimental Strategy for the Determination of Heat Transfer Coefficients in Pebble Beds Cooled by Fluoride Salts ICAPP 2015: International Congress on Advances in Nuclear Power Plants 3-6 May 2015 Nice France

The final rule on occupational exposure to beryllium and beryllium compounds is thus based on consideration of the entire record of this rulemaking proceeding including materials discussed or relied upon in the proposal the record of the hearing and all written comments and exhibits timely received

article{osti_7353650 title = {Effect of photoneutrons on transients of beryllium reflected reactors} author = {Ali S A } abstractNote = {An analytical model is developed to account for the photoneutron sources present in a beryllium reflector The time-dependent two-dimensional and three energy-group diffusion equations are written with an additional photoneutron source term

In nuclear engineering a neutron moderator is a medium that reduces the speed of fast neutrons ideally without capturing any leaving them as thermal neutrons with only minimal (thermal) kinetic energy These thermal neutrons are immensely more susceptible than fast neutrons to propagate a nuclear chain reaction of uranium-235 or other fissile isotope by

A pebble-bed reactor thus can have all of its supporting machinery fail and the reactor will not crack melt explode or spew hazardous wastes It simply goes up to a designed idle temperature and stays there In that state the reactor vessel radiates heat but the vessel and fuel spheres remain intact and undamaged


US2868990A US552668A US55266855A US2868990A US 2868990 A US2868990 A US 2868990A US 552668 A US552668 A US 552668A US 55266855 A US55266855 A US 55266855A US 2868990 A US2868990 A US 2868990A Authority US United States Prior art keywords antimony beryllium cylinder source recess Prior art date 1955-12-12 Legal status

Hence the conventional method of preparing beryllium pebbles has to be modified to a novel technique such as the rotating electrode process (REP) In the present paper REP modeling design and selection of process parameters to control the particle size have been carried out

Oct 01 2014Read Fabrication of beryllide pebble as advanced neutron multiplier Fusion Engineering and Design on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

Beryllium is a lightweight metal that is used for its exceptional strength and high heat-absorbing capability Beryllium and its alloys can be found in many important technologies in the defense and aeronautics industries such as nuclear devices satellite systems radar systems and aircraft bushings and bearings

As one of the breeding blanket candidates for China Fusion Engineering Test Reactor (CFETR) the water-cooled ceramic blanket (WCCB) was proposed to use mono-sized beryllium pebble bed and binary mixed Li 2 TiO 3 /Be 12 Ti pebble bed in order to increase the packing factor and meet the tritium breeding ratio requirement Helium (mixed with 0 1% content of H 2) is used