Steel core barrel

Soil samples for VOC analysis are collected into airtight coring devices or into preserved VOA vials. Soil samples for SVOC, metal, and inorganic parameter analyses are collected into brass or stainless steel core barrel liners, acrylic liners, or into glass jars with PTFE-lined lids. The liners are capped with PTFE sheets and plastic caps. 

The proposed reactor design would be based on the HTR-Modul reactor. It could simply be described as a pebble bed (sphere) core with graphite reflector, carbon insulation, steel core barrel and a steel pressure vessel. The main deviations from the Modul reactor are antcipated to be ... 

The active region of the core consists of fijel blocks arranged in a ring. The centre and outer portions of the core consist of unfuelled, solid, removable reflector blocks. The core assembly is surrounded by a steel core barrel and contained inside an uninsulated reactor vessel. 

The annular core of the GTHTR300 reactor consists of 90 fuel columns with each column stacked of 8 hexagonal fuel blocks high and is capped at top and bottom with reflector blocks. The active core is surrounded by inner and outer side graphite reflector columns, some of which also serve as control rod guide columns. The core is enclosed by a steel core barrel, which is in turn housed in the steel RPV. The coolant enters the reactor via the inner pipe of the horizontal coaxial duct on the left of the vessel and travels upwards in the flow channels embedded in the outer side reflector. 

Drilling jars, stabilizers and, usually, core barrels are also made from AISI 4140 or 4145H steel and sometimes AISI 4340 or 4340H steel is also used. Tbe steel is heat treated to the hardness level of 285 to 341 Bhn. 

Sample containers for subsurface soil sampling stainless steel or brass core barrel liners 6 inches in length with plastic caps... 

The core lateral restraint structure is composed of metal components consisting of a core barrel, seismic keys, coolant channels, and boss located between the PSR and the reactor vessel as shown in Figures 4.4-11 and 4.4-12. The core barrel is a cylinder composed of approximately 76 mm (3 in.) thick steel to locate, restrain, and limit the motion of the core outer radial boundary. It is attached to the top plate of the core support structure. 

IB-1, IB-2, LE-TRU, ME-TRU, HE-TRU = different enrichment zones of active core REFL = radial reflector consisting of 50 volume % stainless steel and 50 volume % lead BARREL/Pb = core barrel/shroud and lead coolant surrounding reflector Pb = lead coolant in downcomer and CR = control rod locations... 

A bullet jacket is normally harder than the bullet core material but soft enough to take up the rifling and not cause excessive wear to the barrel. Bullet jackets were for a long period made of cupronickel (80% copper, 20% nickel), gilding metal (90% to 95% copper, 10% to 5% zinc) or steel which was coated... 

Burrs will be thrown up inside the bore by the drill s entry and exit into and out of the bore. Therefore, it will be necessary to lap the rifled portion after the ports are drilled by casting a lead 1 > around a steel rod as described in the barrel making chapter of Volume One of this series. The occurrence of these burrs can be greatly reduced by pouring the bore full of molten lead before the ports are drilled and driving the lead core out with a close-fitting rod after the drilling is complete. 

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