[en] A compact removal equipment (TRE), assembled in a console with casters, has been developed for air cleanup of a glove box to be used for handling tritium in some 10 curies. The TRE was designed to remove gaseous tritium in the form of T₂, HT and CH₃T through oxidation with precious metal/alumina catalyst followed by adsorption in zeolite pellets. The present paper reports the results of air cleanup experiments of atmosphere in a glove box by using hydrogen tritide and the HT-to-HTO factional conversions determined under various conditions of catalyst temperature and the gas flow rate

[en] In the paper possible field of application of viscid composition is described and the results of patent and literary researches are presented. Authors developed the variant of paste for radiological recovery and described its basic advantages. (authors).

[en] A numerical investigation has been carried out for the flow characteristics after exchange of some filters from the original layer to the new low pressure loss layer with equal filtering efficiency. The solution domain includes upper plenum, filter layer, clean space, access panels, and lower plenum. The concept of the distributed pressure resistance was applied to describe the momentum loss in filter layer and access panels. The evolution of the flow field is simulated using the low Reynolds number k-ε turbulent model and SIMPLE algorithm based on the finite volume method. As a result, after the exchange of filter layer the power requirement can be reduced by 8 - 9 percent. The results also demonstrate that the perpendicularity of the flow near access panels may become worse at new filter layer than original filter layer. But the situation can be recovered by adjusting the jopening ratio of access panels. (Author)

[en] Traditionally, the requirements imposed on cleaning quality have been a subject of subjective judgement. A Scandinavian standard (NS-INSTA 800) has now been agreed upon by the Nordic countries and is described in this article. The goal of the standard is to describe a quality measurement system that will make it easier to define different cleaning qualities and thus to help customer and supplier to specify clearly defined requirements. The new standard describes in detail how to measure the cleaning quality and how much dirt should be allowed to remain within each level of quality. The standard describes five quality levels and the measurements are taken on four different surface categories: furniture and fixtures, floors, walls and roofs. Four types of dirt are defined: waste and loose dirt, dust, spots and surface dirt. The cleaning quality achieved is judged by visually counting all impurities on easily accessible surfaces and on surfaces with difficult access (very small horizontal surfaces, horizontal surfaces above 180 cm, panelled ceiling etc)

[en] The purpose and scope of this report is to detail the steps necessary for degreasing and cleaning of superconducting RF Niobium cavities in the A0 clean room. It lists the required equipment and the cleaning procedure.

[en] Clean laboratory environment is a prerequisite for all kinds of analytical tasks, particularly if trace or ultra-trace concentrations in natural matrix materials are targeted. A pragmatic approach to install a clean-room facility is described, and advice is given on how to circumvent potential sources of element contamination in laboratory air. Following such advice it should be possible to operate an ICP-MS for U, Th and trace element analysis in biological tissues and fluids. (author)

[en] Southern Metal Processing has developed a means of cleaning and recertifying metal filters used in condensate polishing, applications which yields pressure drop readings and on-stream run times that are virtually identical to new filters. Initially, a chemical cleaning process is carried out, designed to remove all ion exchange resin as well as iron oxide residue from the porosity of the filter media. This process is compatible with all stainless steel filters now available on the market. In addition, certain non-metallic filters previously used as disposables can also be cleaned using this process. Tests have shown that chemical cleaning designed to remove iron oxide only will result in high delta P readings, due to the continued presence of the various ion exchange resins. These resins are most effectively removed by a 1-2h dwell time in a 700-750^oF environment. The remaining iron oxide can then be removed by a variety of non-corrosive acids and proper flushing techniques. After cleaning, each filter is subjected to a battery of tests to confirm the level of cleanliness and the integrity of the media at a given micron rating. While incidents of small pinholes or cracks in the media are very rare, such a problem can quickly worsen when the filter is exposed to the filtering and blowback cycles during a normal run. (author)

[en] In the paper process of electrolytic-plasma polishing and its field of application are described. The authors propose to use the method of electrolytic-plasma polishing for radiological recovery and cleaning of surface of equipment NPP. (authors).

[en] At the Helmholtz-Institut Mainz (HIM) a cleanroom has been equipped with new tools and installations for the planned treatment of different superconducting RF-cavities. Therefore, the cleanroom had to be shut down and some walls and part of the ceiling had to be dismantled. In its ISO-class 6 area a large ultrasonic and a conductance rinsing bath has been installed. A high pressure rinsing cabinet has been implemented between the ISO-class 6 and 4 cleanroom so that a cavity can be loaded and unloaded from both sides. For drying the ISO-class 4 cleanroom was equipped with a 160°C vacuum oven. Afterwards the cleanroom was sealed again and put back in operation. New cleanroom lift trolleys allow the handling of heavy objects (max. 200 kg). By a rail system in the cleanroom floor it is possible to move entire cold strings through the different clean room classes separated by a roll-up door. This paper reports on the reclassification of the cleanroom after it went back to operation and first experiences with its cleaning. Particle measurements of equipment in operation will be presented as well. (paper)

[en] By developing metrics for evaluating cleanroom air system performance and overall load intensity, this paper provides energy benchmarking results for thirteen cleanroom environmental system performance, and identifies opportunities for improving cleanroom energy efficiency while maintaining or improving cleanroom contamination control. Comparisons with IEST Recommended Practice are made to examine the performance of cleanroom air systems. These results can serve as a vehicle to identify energy efficient cleanroom design practices and to highlight important issues in cleanroom operation and maintenance. Results from this study confirm that there are opportunities in improving energy efficiency of cleanroom environmental systems while maintaining effective contamination control