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AbstractAbstract
[en] Short communication
Original Title
Weitere Aufkonzentrierung von Verdampferkonzentraten mit Hilfe eines neuartigen Durchlaufverdampfers
Primary Subject
Source
Deutsches Atomforum e.V., Bonn (Germany); Kerntechnische Gesellschaft e.V., Bonn (Germany); 494 p; May 1993; p. 253-256; INFORUM Verl; Bonn (Germany); 20. annual meeting on nuclear technology; 20. Jahrestagung Kerntechnik (JK-20); Cologne (Germany); 25-27 May 1993
Record Type
Book
Literature Type
Conference
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Fort, W.G.S.; Lee, W.W.
Department of Energy, Washington, DC (USA)1981
Department of Energy, Washington, DC (USA)1981
AbstractAbstract
[en] Gaseous UF6 is withdrawn from a first system and directed into a second system for converting the gas to liquid UF6 at an elevated temperature. An improved method for withdrawing the liquid UF6 from the second system and storing it as a solid in a plurality of storage vessel is claimed. The method comprises the steps of: (a) directing an increment of liquid UF6 from the second system into a first closed storage vessel; (b) flash-evaporating UF6 from the first vessel into one of the first system and second system to cool and solidify UF6 in the first vessel while directing an increment of liquid UF6 from the second system into a second closed storage vessel; (c) flash-evaporating UF6 from the second vessel into one of the first system and second system to cool and solidify UF6 in the second vessel while directing another increment of liquid UF6 from the second system into the first vessel; and (d) flash-evaporating UF6 from the first vessel into one of the first system and second system to cool and solidify additional UF6 in the first vessel
Primary Subject
Source
2 Jul 1981; vp; AU PATENT DOCUMENT 78/36883/B/; Copies available from the Commissioner of Patents, Canberra; Filed 7 Jun 1978, priority 21 Jun 1977 (808860US).
Record Type
Patent
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AbstractAbstract
[en] The purpose of this research was to investigate the de-entrainment of boron for evaporators used in nuclear power plants. The forced circulation and semi-continuous type evaporator was used in the experiment. Cyclone and glass-wool packed column which is supposed to provide good decontamination factor as well as easy maintenance, were selected as de-entrainment device to be used in the evaporation of radioactive liquid wastes. The de-entrainment device combined with cyclone and glass-wool column has shown overall DF more than 1000 for boron. (Author)
Primary Subject
Record Type
Journal Article
Journal
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Rushton, W.E.
Whiting Corp., Harvey, Ill. (USA)1974
Whiting Corp., Harvey, Ill. (USA)1974
AbstractAbstract
[en] The unit described includes an evaporation chamber holding water vapour, a pumping chamber containing a rotor, automatically centred in a cowl, driven by a motor placed above the level of the liquid, and a chamber containing a heat exchanger. According to the invention the pump, the top part of the chamber and the heat exchanger may all be removed from above for cleaning and scaling. This system is applicable to the evaporation of radioactive liquid wastes which must be concentrated before discharge
[fr]
On decrit un ensemble comprenant une chambre d'evaporation qui contient de la vapeur d'eau, une chambre de pompage qui contient une helice automatiquement centree dans un capot entrainee par un moteur place au-dessus du niveau de liquide et une chambre comprenant un echangeur de chaleur. Selon l'invention, la pompe, la partie superieure de la chambre et l'echangeur de chaleur peuvent tous etre retires par le haut en vue du nettoyage et du detartrage. Ceci est applicable a l'evaporation des dechets liquides radioactifs qui doivent etre concentres avant d'etre jetesOriginal Title
Ensemble de concentration de dechets radio-actifs par evaporation
Primary Subject
Source
14 Mar 1974; 23 p; FR PATENT DOCUMENT 2230042/A/; Available from Institut National de la Propriete Industrielle, Paris (France); priority claim: 17 May 1973, USA.
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Patent
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AbstractAbstract
[en] A thermal evaporation unit has been ,especially, designed and constructed to fit in the laboratory chamber, which is already constructed for laser isotope separation project. The evaporation unit consists of three parts: an evaporator, a thermal isolation unit and a cooling jacket. The evaporator designed so that it produces the Yb metal vapour through a thin slit. The sheet of the vapour that comes out of the slit diverts and crosses the three laser beams that are needed for the isotope separation process. The diversion of the metal vapour sheet helps in optimizing the interaction volume between the metal vapour and the laser beams. The temperature of the evaporator can reach up to 800 Centigrade homogeneously along the slit. Less than 800 Centigrade temperature is needed to sublimate the Yb metal (powder form) in the vacuum chamber at about 10-6 mbar as has been tested. The temperature of the evaporator is controlled by the current , which passes through the heating wires. (author)
Primary Subject
Source
Abstract of Scientific Research
Record Type
Journal Article
Journal
Aalam Al-Zarra; ISSN 1607-985X;
; (114); p. 67

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AbstractAbstract
[en] This article shows how evaporation can be an effective and economical means of reducing radwaste and recovering relatively pure water, performing 2 functions in the nuclear plant: reduction of the waste volume through evaporation of the volatile solvent (water), resulting in a smaller volume and smaller mass of contaminated material for ultimate storage or disposal; and reduction of relatively pure water (condensed vapor), which can be recycled and reused within the plant or discharged to the environment with little or no additional treatment. Some of the improvements and problems that have become evident as a result of actual operation of a well-designed forced-circulation evaporator are discussed. The focus is on volume reduction and removal of ammonia
Primary Subject
Record Type
Journal Article
Journal
Chemical Engineering Progress; ISSN 0009-2495;
; v. 79(7); p. 58-63

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Liptak, L.; Takach, F.
Research on desactivation of liquid, solid and gaseous radioactive wastes and decontamination of surfaces. Proceedings of U the 4-th scientific and technical conference of CMEA. Moscow, 20 - 23 Dec 19761978
Research on desactivation of liquid, solid and gaseous radioactive wastes and decontamination of surfaces. Proceedings of U the 4-th scientific and technical conference of CMEA. Moscow, 20 - 23 Dec 19761978
AbstractAbstract
[en] Experience of the pilot plant operation for evaporation of the liquid radioactive wastes from atomic power station is described. Evaporation is done at the temperature below boiling point. The installation used for experiments provides opportunity to verify two differentversions of technology, namely: application of the tank-concentrator hawing double walls permitting to use it for transportation wastes to bureal place outside of the site and use of a single walled tank. Following parameters were measured and registered: medium temperature in different points; qooling water and air expenditure; condensate accumulation; air heater power. On determining the heat engineering parameters of the insatllation the main task of experiments performed was determination of heat and mass transfer laws ower the surface of water in condition of vortical movement of air and development of the mathematical model for computation of installation's operation conditions and development of design calculation methodology. Influence of substances with densities less than the density of solution, especially of lubricants, with productivity of the device. Metods of romowal of these substances from the solution surface were inve stigated. Also the results of investigation on salts crystallization in course of long time operation of the device are given. (I.T.)
[ru]
Original Title
Opyt ehkspluatatsii polupromyshlennoj ustanovki dlya uparivaniya zhidkikh radioaktivnykh otkhodov pri temperature nizhe temperatury kipeniya
Primary Subject
Source
Sovet Ehkonomicheskoj Vzaimopomoshchi, Moscow (USSR). Postoyanniya Komissiya po Ispol'zovaniyu Atomnoj Ehnergii v Mirnykh Tselyakh; p. 41-44; 1978; p. 41-44; Atomizdat; Moscow; 4-th scientific and technical conference of CMEA; Moscow, USSR; 20 - 23 Dec 1976; 3 refs.; 1 fig.
Record Type
Miscellaneous
Literature Type
Conference
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Smith, Jared D.; Cappa, Christopher D.; Drisdell, Walter S.; Cohen, Ronald C.; Saykally, Richard J.
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States) (US). Funding organisation: USDOE Director. Office of Science. Basic Energy Sciences (United States)2006
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (United States) (US). Funding organisation: USDOE Director. Office of Science. Basic Energy Sciences (United States)2006
AbstractAbstract
[en] Recent theoretical and experimental studies of evaporation have suggested that on average, molecules in the higher-energy tail of the Boltzmann distribution are more readily transferred into the vapor during evaporation. To test these conclusions, the evaporative cooling rates of a droplet train of liquid water injected into vacuum have been studied via Raman thermometry. The resulting cooling rates are fit to an evaporative cooling model based on Knudsen's maximum rate of evaporation, in which we explicitly account for surface cooling. We have determined that the value of the evaporation coefficient (γe) of liquid water is 0.62 ± 0.09, confirming that a rate-limiting barrier impedes the evaporation rate. Such insight will facilitate the formulation of a microscopic mechanism for the evaporation of liquid water
Primary Subject
Source
LBNL--61735; BNR: KC0301020; AC02-05CH11231; Journal Publication Date: 2006
Record Type
Journal Article
Journal
Journal of the American Chemical Society; ISSN 0002-7863;
; CODEN JACSAT; v. 128(39); p. 12892-12898

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Guthrie, M.D.
Westinghouse Hanford Co., Richland, WA (United States). Funding organisation: USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)1996
Westinghouse Hanford Co., Richland, WA (United States). Funding organisation: USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)1996
AbstractAbstract
[en] The 242-A Evaporator Campaign 95-1 was started on June 6, 1995 and finished July 27, 1995. An overall Waste Volume Reduction (WVR) of 8.18 million liters (2.16 mGAL OR 87.6% WVRF) was achieved from 9.35 million liters (2.47 Mgal) of processable waste contained in 108-AP, 107-AP, 106-AW and 102-AW. Slurry generated from Campaign 95-1 consisted of 1.05 million liters (278,000 gal) of dilute double-shell slurry feed (DDSSF) with a SpG of approximately 1.34. Total process condensate discharged to LERF was 10.3 million liters (2.72 Mgal), achieving a condensate/WVR efficiency ratio of 1.26. Total throughout for Campaign 95-1 was 18.1 million liters (4.79 Mgal). B Pond discharges from steam condensate and cooling water were 15.8 and 583 million liters (4.17 and 154 Mgal) respectively. Based on 145 hours of unplanned downtime, the 242-A Evaporator maintained an operating efficiency of 86% during the 49 day campaign
Primary Subject
Source
12 Feb 1996; 114 p; CONTRACT AC06-96RL13200; Also available from OSTI as DE97052607; NTIS; US Govt. Printing Office Dep
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Report
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Vigreux, B.; Meline, F.
Radioactive waste management, decommissioning, spent fuel storage. V.2. 3. ed1986
Radioactive waste management, decommissioning, spent fuel storage. V.2. 3. ed1986
AbstractAbstract
[en] Evaporation is one of the radioactive effluent treatments used, enabling a purified distillate to be obtained and giving excellent decontamination factors for all the radionuclides present, if the pH conditions are correctly chosen and in the absence of volatile solvents. SGN has acquired a wide experience in the concentration of radioactive effluents and possesses a specific know-how in the field of droplet abatement and demisting for this application. The report describes the evaporation system optimized for the treatment of low and medium activity effluents, developed by SGN, which includes a special highly performant scrubbing column and, if necessary an additional lamella separator for droplet abatement. It also presents the ACEREN evaporator offered by SGN under CEA licence and based on the principle of a thin film natural evaporation at low temperature, without condensation of vapors
[fr]
L'evaporation est un des procedes de traitement des effluents radioactifs. Il permet d'obtenir un distillat purifie et conduit a d'excellents facteurs de decontamination pour les radioelements presents si les conditions de pH sont correctement choisies et en l'absence de solvants volatils. SGN possede une grande experience dans la concentration par evaporation des effluents radioactifs et un savoir-faire particulier dans le domaine de la lutte contre le primage et du devesiculage des vapeurs. L'expose decrit le systeme d'evaporation optimise developpe par SGN pour le traitement des effluents de basse et moyenne activite, systeme qui comprend, pour l'epuration des vapeurs, d'une colonne de lavage a hautes performances, et si necessaire au separateur lamellaire additionnel. Il est presente egalement l'evaporateur ACEREN, propose par SGN sous licence du CEA, utilisant le principe de l'evaporation naturelle en film mince a basse temperature sans condensation des vapeursOriginal Title
Concentration des effluents radioactifs de faible et moyenne activite par evaporation
Primary Subject
Source
CEA, 75 - Paris (France); 421 p; Oct 1986; p. 28-53; Commissariat a l'Energie Atomique; Paris (France)
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Book
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