Thermal Shielding

Thermal Shielding

 

in nuclear engineering, means for protecting the external parts of a reactor—for example, concrete components of biological shielding, which cannot withstand great increases in temperature—from heat-generating radiation emitted by the reactor core. Thermal shielding is created by a layer of heat-resistant material, such as steel, cast iron, or sand, which reduces the neutron and gamma-ray fluxes to levels at which no great temperature gradients, and consequently no mechanical stresses, are created in the shielded parts. Thermal shielding is mounted near the core, behind the reflector, and may be specially cooled. In certain types of reactors the walls of the reactor vessel are used as thermal shielding.

References in periodicals archive ?
Titanium Foam Thermal Shielding, Returning Small Payloads from Space (University of Auckland, $999,714 over 3 years)
Influence of heat-stable filler on the thermal shielding performance of water-based intumescent fire-resistive coating for structural steel applications--Ravindra G.
Ceramics are used today in brake pads, the housing of microelectronics, and thermal shielding tiles (like the ones on spacecraft).
Myhra adds that post-war analysis indicated that the space-plane would have burnt up during re-entry but this could have been overcome with thermal shielding. The underlying concept was sound but it was many years ahead of its time.
Barely a day after blasting into orbit, the space shuttle crew used a 100-foot, laser-tipped boom to check the thermal shielding on the wings and nose.
For spraying it was used CastoDyn DS 8000, an advanced modular oxy-acetylene thermal spray system, designed to spray a wide range of alloys and other materials for many different applications, from anti-abrasion coatings to thermal shielding. Thermal spray parameters are presented in table 2.
Along with its thermal shielding properties, insulation blankets also typically offer greater sound absorption than hard coat materials and also tend to be more vibration resistant.
The astronauts planned a Thursday afternoon inspection of their ship's thermal shielding, using a 30-meter laser-tipped boom.
This included installation of thermal shielding, cooling water systems, enhanced instrumentation and secondary restraint components.
Located near the right main landing gear door, the gouge was 9cm long and penetrated all the way through the thermal shielding on the shuttle's belly.
After liftoff, an initial review of video from cameras mounted on the shuttle showed that perhaps six pieces of foam did break off, but at an altitude where they were unlikely to damage the shuttle's precious thermal shielding systems.
Endeavour's bottom thermal shielding was pierced by a piece of debris that broke off the external fuel tank shortly after liftoff last week.