Beryllium Pebble Control

Safety and Health Topics | Beryllium - Exposure Evaluation

These practices both limit worker exposure to beryllium in the workplace and help prevent beryllium contamination of workers' cars and homes The following list of resources provides information about beryllium and control methods that can be used to reduce and prevent exposure:

BERYLLIUM - Centers for Disease Control and Prevention

Because the beryllium workers used in the case-control study conducted by Silveira and co-workers were derived from case series from several different workplaces, the odds ratio results by genotype were not readily applied in practice by either researchers, corporate medical directors, or beryllium workers

Modeling of chemical reactions of beryllium/beryllide

Combination of water, as coolant, and beryllium/beryllide, however, may pose a critical safety problem, ie the chemical reactivity of the beryllium/beryllide pebble and hydrogen generation We present a new phenomenological model of the reaction behavior of the beryllium/beryllide pebble with the steam

Physics and chemistry of beryllium - Materion

breaking up the beryllium biscuit into pea-to-marble-sized pebbles which are relatively slag-free After cooling, the charge is water-leached in a ball mill readily separating the magnesium fluoride and beryllium pebble and dissolving the excess beryl-lium fluoride for recycle 2 Electrowinning of beryllium

Thermal and mechanical properties of beryllium pebbles

Basic characteristics of beryllium pebbles are required to design the blanket and in-pile mock-ups From this point of view, produc- tion methods and basic characteristics including ther- mal and mechanical properties of beryllium pebble have been investigated [3]

§19101024 Beryllium

Beryllium work area means any work area containing a process or operation that can release beryllium where employees are, or can reasonably be expected to be, exposed to airborne beryllium at any level or where there is the potential for dermal contact with beryllium

Beryllium - Wikipedia

Beryllium sulfide, selenide and telluride are known, all having the zincblende structure Beryllium nitride, Be 3 N 2 is a high-melting-point compound which is readily hydrolyzed Beryllium azide, BeN 6 is known and beryllium phosphide, Be 3 P 2 has a similar structure to Be 3 N 2

R&D Plan for Addressing the Thermomechanical Behavior of

active control mechanism, whereby, if needed, the effective thermal conductivity of a Be/He pebble bed in a fusion blanket could be adjusted to account for …

EXPERIMENTAL INVESTIGATION AND ANALYSIS OF THE …

Beryllium is used in the form of a packed pebble bed where temperature control is required because the pebble bed thermal conductivity could be controlled through adjusting purge gas compositions and operating ranges In general, the pebble bed can be treated as an homogeneous medium and the heat transfer parameters

Re-circulation Blanket Concept with Beryllium Pebble Beds

quantities of beryllium pebbles (~30 tons for one power plant) is rather expensive and causes safety concerns D) Thermal conductivity of pebble beds is relatively low, resulting in rather high beryllium temperatures E) Beryllium from replaced blankets has to be detritiated before shipping the blankets to a reprocessing plant

Talk:Pebble-bed reactor - Wikipedia

Every reactor design has some kind of manual mechanism to control neutron absorption The most common is control rods inserted into the center of the reactor, alongside the fuel rods In a pebble bed reactor, this is clearly not a good idea

Beryllium - Element information, properties and uses

Beryllium has no known biological role, and its dust causes chronic inflammation of the lungs and shortage of breath Brief exposure to a lot of beryllium, or long exposure to a little, will bring on this lung condition which is known as berylliosis

A MODULAR PEBBLE-BED ADVANCED HIGH TEMPERATURE …

control (rooms)); stress analysis for power conversion system piping • Thermal, Fluid and Chemical Design: Pebble transfer system and fuel storage system design (identifying where rooms go and how large); salt and cover gas chemistry control (rooms) • Beryllium and Radiation Safety: Beryllium safety requirements and approach,

40 CFR 421152 - Effluent limitations guidelines

40 CFR 421152 - Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available

Federal Register :: Occupational Exposure to Beryllium

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

Beryllium Pebbles Preparation and Modeling of Rotating

Request PDF on ResearchGate | Beryllium Pebbles Preparation and Modeling of Rotating Electrode Process | High-purity beryllium in the form of spherical pebbles of size ranging from 02 to 2 mm are

TO - appsdticmil

beryllium as set forth in reports from the Defense pect beryllium resembles metals more to the Metals Information Center as follows: right and lower in the periodic table, i e , alu- …

40 CFR 421153 - Effluent limitations guidelines

Except as provided in 40 CFR 12530 through 12532, any existing point source subject to this subpart shall achieve the following effluent limitations representing the degree of effluent reduction attainable by the application of the best available technology economically achievable: (a) Solvent extraction raffinate from bertrandite ore

The Temperature Control Mechanism of a Breeding Blanket

The Beryllium zones only affect the adjacent zones, but the effect can be ignored The second beryllium zone and the first mixed pebble zones are mainly limited to the reduced activation ferritic/martensitic material due to the lower temperature limitation

Designing and Fabricating BerylliumDesigningand

The production of beryllium powder begins at Materion Beryllium & Composites with the extraction of the metal from the ore through a series of chemical operations Primary beryllium is produced as “pebble” by the magnesium reduction of anhydrous beryllium fluoride

Improvements to Oak Ridge National Laboratory's Beryllium

Oak Ridge National Laboratory’s Beryllium Program ISM Summit 2009 Knoxville, TN August 27, 2009 Planning and Control is required prior to conducting work Improvements to Oak Ridge National Laboratory's Beryllium Program Presentation Author: Petherick, K R

Measurements of the Thermal Conductivity of Compressed

PDF | On Jan 1, 2005, J Reimann and others published Measurements of the Thermal Conductivity of Compressed Beryllium Pebble Beds EFDA reference: TW2-TTBB-007a D4

The Temperature Control Mechanism of a Breeding Blanket

The beryllium pebble (BeP) zones are allocated to the thermal barriers closed to the beryllium zones The layer thickness of each BeP is 3 mm In the back zones, the mixed pebble bed is used as Li 4SiO 4 and Be 12Ti, and marked as Li/Be (i, i = 1-6) for 1-D model In the first mixed pebble zone, there is also a BeP(4) for the thermal

Beryllium Compounds - US EPA

Pure beryllium is a hard gray metal that does not occur naturally but does occur as a chemical component of certain kinds of rocks, coal and oil, soil, and volcanic dust (1) Beryllium is also present in a variety of compounds such as beryllium fluoride, beryllium chloride, beryllium sulfate, beryllium oxide, and beryllium phosphate (1)

FT/P2-8 Transient Safety Study of Chinese Helium Cooled

control the first wall (FW) coolant temperature increase The In-Vessel Loss of Coolant Accident (LOCA) results The Li4SiO4 and beryllium pebble bed materials temperature decreases when this LOCA happens This means that the heat of the TBM can be removed passively

Primary Beryllium Subcategory - GPO

§ 421150 Applicability: Description of the primary beryllium subcategory The provisions of this subpart are applicable to discharges resulting from the production of beryllium by primary beryllium facilities processing beryllium ore concentrates or beryllium hydroxide …

Process for preparing metallic beryllium pebbles - Japan

Sep 28, 1999 · The above results apparently indicate that the thermal conductivity of the beryllium which was already subjected to the neutron irradiation remarkably lowers due to the swelling, and sufficiently indicates that it is important to control the swelling for the metal beryllium pebbles which are used as the neutron multiplying material

Control Techniques for Beryllium Air Pollutants - EPA

INTRODUCTION Control Techniques for Beryllium Air Pollutants is issued in accordance with Sec- tion 112 (b) (2) of the Clean Air Amend- ments of 19701 Beryllium in almost all forms is known to have adverse effects upon human health

Beryllium | Be - PubChem

Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust Beryllium compounds are commercially mined, and the Beryllium is purified for use in nuclear weapons and reactors, aircraft and space vehicle structures, instruments, x-ray machines, and mirrors

Did You Know - Facts about Beryllium

Beryllium is a part of many of the things you rely on each day, including cellular phones, kitchen and laundry appliances, home temperature controls, MP3 players, desktop and …

Monte Carlo calculations of control-rod worth of a medium

reactivity worth of control rods in the beryllium oxide moderated pebble bed reactor Technical Report Spinks, N Implementation of CTRLPOS, a VENTURE module for control rod position criticality searches, control rod worth curve calculations, and general criticality searches

Status of Beryllium Study in JAEA - University of Missouri

Pebble Beryllium Pebble Packing Beryllium Pebble Fabrication Vacuum Cast Beryllium Electrode Fabrication 500˚C1400˚C BeCl 2 (>99%) Recovery of Beryllium Irradiated Beryllium Reflector ITER Test Blanket Module Beryllium Powder JMTR Beryllium Frame JMTR Reflector Beryllium Electrode Recycle of irradiated beryllium is worldwide problem

Facts About Beryllium - Live Science

Uniquely strong and light, beryllium is used to make cell phones, missiles and aircrafts But workers who handle the metal need to watch out, as airborne beryllium has been known to be highly

Division of Air Pollution Control (DAPC) Response to Comments

PM-10 control efficiency Changed as specified by the company to lower the control efficiency for PM-10 to 80 percent P116 and P117 Testing requirements Remove the first paragraph in the testing section for both emission units Comment 8: The company stated that the beryllium emissions from the Wet

Beryllium Content of Volcanic Rocks - USGS

BERYLLIUM CONTENT OF VOLCANIC ROCKS By DANIEL R SHAWE and STANLEY BERNOLD ABSTRACT Spectrographic and chemical analysis of 1,172 saturated and oversaturated volcanic rocks, including tuffs, flow rocks, and glasses, bring out several possibly significant relations between the beryllium content and the content of silica,

Medical Applications for Beryllium

The special properties of beryllium are essential to medical technologies that save and enhance lives Improving imaging Because it is strong, stable, can handle elevated levels of heat resistance and is highly transparent to x-rays, beryllium, in thin foil form, has long been critical to the operation of medical and scientific x-ray equipment

Thermal conductivity of compressed beryllium pebble beds

Fusion Engineering and Design 81 (2006) 449–454 Thermal conductivity of compressed b J Reimann a,∗, G Piazza b, H a ik, PO ingdon, 76227 K June 2 Available online…

2 Exposure Assessment - The National Academies Press

Pebble plant median: 04 µg/m 3 Pebble plant range: 01-792 µg/m 3 In a study to evaluate the efficacy of an improved particle-migration control program, beryllium was measured in workplace air, on work surfaces, on cotton gloves worn by employees over nitrile gloves, and on the necks and faces of employees after implementation of the