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1. 发明专利

JP2000304897A FORMING METHOD FOR TARGET FOR RADIOIODINE EXTINCTION 失效
公开(公告)号：JP2000304897A
公开(公告)日：2000-11-02
申请号：JP11435599
申请日：1999-04-22
申请人： TOSHIBA CORP , TOSHIBA ENGINEERING CO
发明人： MIKURA MICHITAKA , KANEKO MASAAKI , HIRAYAMA FUMIO , IKENAGA NOBUYUKI
IPC分类号： B09B3/00 , B01D15/00 , B09B5/00 , C02F1/70 , G21F9/00 , G21F9/10 , G21F9/30
摘要： PROBLEM TO BE SOLVED: To collect iodine into a solution from a silver adsorbing material containing radioiodne generated from nuclear facilities without volatilizing it, and to form a target for radioiodine extinction by use of a precipitation reaction. SOLUTION: A reducing agent for reducing silver is added to collect iodine into a liquid from spent silver adsorbing material containing a lot of radioiodine. After the addition of the reducing agent, solid-liquid separation 3 is executed, a solution 5 wherein iodine is desorbed from a solid phase 4 is collected, then an oxidation treatment for the excessive reducing agent remaining in the solution is executed. Next, metal ions (Cu2+, Pb2+, Bi3+ or the like) easy to form insoluble compounds with iodine ions are added to precipitate and form 8 an iodine compound as a target for iodine extinction. Thereby, iodine for forming the target can be safely treated in the solution without volatilizing it.

2. 发明专利

JPH06160540A QUANTIFYING METHOD FOR ALPHA-RAY EMITTING NUCLIDE 失效
公开(公告)号：JPH06160540A
公开(公告)日：1994-06-07
申请号：JP31504592
申请日：1992-11-25
申请人： TOSHIBA CORP
发明人： HIRAYAMA FUMIO , MURATA EIICHI
IPC分类号： G01T1/167 , G01T1/204 , G01T1/36 , G01T7/00
摘要： PURPOSE:To simply quantify nuclide without requiring a special tracer or a standard radiation source by adding natural samarium to a sample solution as an internal standard material. CONSTITUTION:Natural samarium is added to a sample solution containing alpha-ray emitting nuclide as an internal standard material, and the alpha-rays emitted from the nuclide samarium-147 contained in samarium are concurrently measured. Samarium is added 2 to the solution 1 containing alpha-nuclide. The alpha-nuclide is reduced 3 by bivalent ions. Hydrofluoric acid is added 4 to coprescipitate 5 samarium fluoride. This coprecipitated object is sucked and filtered 6, a filter is dried 7, then the alpha-ray spectrum is measured 8. The coprecipitation recovery percentage of 100% is obtained when the samarium quantity of 0.1mg or above is added. The coprecipitation recovery percentage is reduced as the added samarium quantity is reduced.

3. 发明专利

JPH0495800A REMOVAL OF CARBON ISOTOPE IN CONDENSED WASTE LIQUID 失效
公开(公告)号：JPH0495800A
公开(公告)日：1992-03-27
申请号：JP20752290
申请日：1990-08-07
申请人： TOSHIBA CORP
发明人： SAKURAI MANABU , HIRAYAMA FUMIO , KUROSAWA SETSUMI , KAMATA TOSHIMASA
IPC分类号： G21F9/08
摘要： PURPOSE:To transport carbon isotopes such as C contained in condensed waste liquid, into vapour of pure water and decrease the density of the carbon isotopes in the condensed waste liquid by providing pure water into condensed waste liquid and processing it with evaporation condensation. CONSTITUTION:Provided with a waste liquid condenser are an evaporation condenser 2 to heat and evaporate the containing liquid and to produce condensed liquid 1, a steam condenser 4 to condense the vapour exhausted from the evaporation condenser 2 by cooling and to recover as condensed water 3, and a supply water tank 7 to store pure water 6 to supply to the evaporation condenser 2 via a water supply pump 5 etc. Condensed waste liquid 1 is produced by processing radioactive waste liquid containing a carbon isotope with mass number 14 by evaporation condensing, and then the evaporation condensation processing is continued by supplying pure water 6 to the condensed waste liquid 1. By this, C contained in the condensed waste liquid 1 is efficiently removed even in the conditions in the can of condenser 2 set on alkalic side.

4. 发明专利

JPH1048390A METHOD FOR EXTINGUISHING RADIOACTIVITY OF RADIOACTIVE IODINE AND NEUTRON IRRADIATION DEVICE THEREFOR 失效
公开(公告)号：JPH1048390A
公开(公告)日：1998-02-20
申请号：JP20803896
申请日：1996-08-07
申请人： TOSHIBA CORP
发明人： MIKURA MICHITAKA , HIRAYAMA FUMIO , KUROSAWA SETSUMI , MURATA EIICHI
IPC分类号： G21F9/00
摘要： PROBLEM TO BE SOLVED: To transmute iodine (I)-129 into a nuclide with a shorter half-life period, and lessen the burden in the final disposal of wastes by irradiating it in a stabilized condition with neutrons. SOLUTION: A liquid target 4 or a solid target 5 is made from solid wastes 1, liquid wastes 2 or waste-silver absorbents 3 which contain I-129 produced from nuclear facilities such as a nuclear power plant and a nuclear-fuel reprocessing plant. The liquid target 4 or the solid target 5 is irradiated with such neutrons as thermal neutrons, epithermal neutrons, resonance neutrons and fast neutrons from neutron generating facilities such as a light-water reactor, a fast-breeder reactor and a materiel testing reactor. Such neutron irradiation can transmute I-129, a nuclide with a long half-life period (1.57×10 years), into I-130 with a short half-life period (12.36 hours).

5. 发明专利

JPH0875681A METHOD AND APPARATUS FOR NONDESTRUCTIVE ANALYSIS OF IODINE 失效
公开(公告)号：JPH0875681A
公开(公告)日：1996-03-22
申请号：JP21475594
申请日：1994-09-08
申请人： TOSHIBA CORP
发明人： TAMURA TOSHIYUKI , IGARASHI NOBORU , HIRAYAMA FUMIO
IPC分类号： G01N23/222
摘要： PURPOSE: To provide a device, which can be conveyed and set into an iodine adsorbing device that cannot be moved, can discriminate other components of radioactive product that coexists with the iodine and has a high analysis accuracy. CONSTITUTION: A material under inspection 1 is arranged in front of a neutron irradiating mechanism 2, and the neutrons are irradiated for the specified time. Then, the material under inspection 1 is moved to front part of a gamma-ray detecting mechanism 3 with a moving mechanism for the material under inspection. The gamma rays emitted from the material under inspection are detected and measured with a gamma-ray detector 10. The time from the end of the irradiation of the neutrons to the start of the detection of the gamma rays is set at the constant time including the moving time. Basically, cooling is performed for 10 minutes, and the attenuation for 2.4 minutes is allowed for the case of Ag-108. The gamma ray of 536KeV discharged from I-130m having the half-life of 9.16 minutes are noted, and the spectrometry measurement of the gammarays is performed.

6. 发明专利

JPH04216498A UTILIZING SPENT ION EXCHANGER RESIN 失效
公开(公告)号：JPH04216498A
公开(公告)日：1992-08-06
申请号：JP40323590
申请日：1990-12-18
申请人： TOSHIBA CORP
发明人： SAKURAI MANABU , HIRAYAMA FUMIO , KUROSAWA SETSUMI , KAMATA TOSHIMASA
IPC分类号： G21F9/12
摘要： PURPOSE:To provide a usage of spent ion exchanger resin generated from a purification processing system in reducing the load of radioactive waste processing system by using the resin for processing waste liquid in processing equipment in a waste system. CONSTITUTION:In utilizing spent ion exchanger resin generated from a purification processing system which is not yet broke down the capacity of ion exchanger for a radioactive waste processing equipment by mixing and stiring waste liquid and the spent ion exchanger resin, electric conductivity degradation is prevented and bacteria and oil are eliminated. First, the spent ion exchanger resin is accepted in an inverse wash tank 2, and the condensate in a condenser 8 which is a high electric conductivity waste liquid abundant in bacteria and oil is sent to the inverse wash tank 2 through a condensate return pipe 13 and they are stired in the siring line 15 of the inverse wash tank to eliminate ion components, bacteria and oil. Then, they are sent to a deposition separation tank 3 to process by separation.

7. 发明专利

JPH01253697A SEPARATION OF ALPHA NUCLIDES FROM RADIOACTIVE ORGANIC USED SOLVENT 失效
公开(公告)号：JPH01253697A
公开(公告)日：1989-10-09
申请号：JP8025188
申请日：1988-04-02
申请人： NIPPON ATOMIC IND GROUP CO , TOSHIBA CORP
发明人： HASEGAWA AKIRA , ICHIHASHI TOSHIO , HIRAYAMA FUMIO , NAGAYAMA KENICHI
IPC分类号： G21F9/10
摘要： PURPOSE:To separate and remove alpha nuclides from a radioactive organic used solvent with a high separation factor, by adding a solution containing La as a coprecipitating agent into a liquid for decomposition treatment of a radioactive organic used solvent to coprecipitate the alpha nuclides and by separating and removing these nuclides. CONSTITUTION:A radioactive organic used solvent is decomposed through contacting with an oxidizing agent (hydrogen peroxide) in an aqueous atmosphere using compounds of iron, copper, cobalt and etc. as a catalyst, thereafter, by adding a solution containing lanthanum ions of a valency value 3 (La ) as a coprecipitating agent so as to adjust a pH value to be 4-5, alpha nuclides are coprecipitated. Through this process, from the liquid for decomposition treatment of the radioactive organic solvent containing U, Pu and etc., the alphanuclides can be separated with a high separation factor.

8. 发明专利

JPH04148899A EVAPORATION ENRICHMENT DEVICE 失效
公开(公告)号：JPH04148899A
公开(公告)日：1992-05-21
申请号：JP27053290
申请日：1990-10-11
申请人： TOSHIBA CORP
发明人： SAKURAI MANABU , HIRAYAMA FUMIO , KUROSAWA SETSUMI , YOSHIKAWA JUN , HOSAKA SEIICHI
IPC分类号： G21F9/08 , G21F9/00
摘要： PURPOSE:To reduce C from condensed waste liquid and prevent corrosion of the evaporation enrichment device by spraying diluted sulfuric acid solution on the evaporation surface for controlling the waste liquid at the evaporation surface at pH 7, and raising the transporting factor of C to the condensate up to 70-60%. CONSTITUTION:By means of a waste liquid supply pump 1 heated waste liquid is sent to an evaporation part 3 to carry out evaporation enrichment. At this time, diluted sulfuric acid solution is sprayed with a spray pipe 5 on the evaporation surface 4 and so the part of the evaporation surface 4 decreases to pH = 5. Then transfer of C the evaporation surface 4 to the condensate is facilitated and 70-80% of C is separated. As the waste liquid on the evaporation surface 4 is checked with a pH sensor 6, diluted sulfuric acid solution is sprayed from a dilute sulfuric acid solution tank 10 with a spray pump 7 in case of alkaline side. If the pH approaches to 6, the spray pump 7 driving is stopped by the signal from a pH controller 8 and the spray is temporarily reduced.

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