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1. 发明专利

JP2000081499A PROCESSING METHOD FOR RADIOACTIVE WASTE, SOLIDIFIED BODY OF RADIOACTIVE WASTE, AND SOLIDIFIER 失效
公开(公告)号：JP2000081499A
公开(公告)日：2000-03-21
申请号：JP26318099
申请日：1999-09-17
申请人： HITACHI LTD , HITACHI ENG SERVICE
发明人： NISHI TAKASHI , MATSUDA MASAMI , NOSHITA KENJI , KIKUCHI JUN , IZUMIDA TATSUO , TAMADA SHIN , KIUCHI YOSHIMASA
IPC分类号： B09B3/00 , G21F9/16 , G21F9/30
摘要： PROBLEM TO BE SOLVED: To inhibit generation of gaseous hydrogen caused by the reaction between an ampholytic metal contained in radioactive waste and a hydraulic solidifier. SOLUTION: In this processing method, a protective film forming agent forming a protective film inhibiting hydrogen generation on the surface of an ampholytic metal, cement, and water are kneaded together in a kneading machine 2, and the kneaded mixture obtained and a hydration reaction promoter promoting the hydration reaction of the cement are injected into a solidification container 1 filled with radioactive incinerated ash containing the ampholytic metal. Since free water is taken in as water of crystallization by the action of the hydration reaction promoter, the reaction of the ampholytic metal with the cement is inhibited to inhibit hydrogen generation.

2. 发明专利

JPH10206594A METHOD AND DEVICE FOR DISPOSING OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH10206594A
公开(公告)日：1998-08-07
申请号：JP837697
申请日：1997-01-21
申请人： HITACHI LTD
发明人： NISHI TAKASHI , NOSHITA KENJI , SASAHIRA AKIRA , IZUMIDA TATSUO
IPC分类号： G21F9/00 , G21F9/02
摘要： PROBLEM TO BE SOLVED: To reduce the corrosion of a heating furnace and improve the recovery of radioactive substances by heating a radioactive waste containing volatile radioactive substances under a reduced pressure, condensing the radioactive substances after vaporizing and separating them and then recovering them in a liquid or solid state. SOLUTION: A waste 2 is loaded into a heating container 1, which is sealed up, a valve 8 is opened, a vacuum pump 10 is actuated and the pressure inside the heating container 1, a condensation pipe 4 and a recovery container 7 is reduced to a set degree of a vacuum with attention paid to a vacuum pressure gauge 9. Then, heaters 3 and 5 are heated up to prescribed temperatures respectively. In case of the recovery of only cesium from the waste 2 contaminated by radioactive cesium, for example, the temperature of the heaters 3 and 5 are set at about 900 deg.C and about 700 deg.C respectively of the set degree of a vacuum is about 10 Torr. Such decompression can reduce the vaporizing temperature of radioactive substances from the waste 2 and can also accelerate the vaporization of the radioactive substances which have permeated inside microprobes of the waste 2. Therefore, it is possible to reduce the corrosion of a heating furnace and improve a decontamination factor.

3. 发明专利

JPH0924249A MEMBRANE EVAPORATOR AND MEMBRANE DISTILLATION METHOD 失效
公开(公告)号：JPH0924249A
公开(公告)日：1997-01-28
申请号：JP17861595
申请日：1995-07-14
申请人： HITACHI LTD
发明人： KUROKAWA HIDEAKI , MATSUMOTO TAKAYUKI , FUNABASHI KIYOMI , BABA TSUTOMU , IZUMIDA TATSUO
IPC分类号： G21F9/08 , B01D61/36 , B01D65/00
摘要： PROBLEM TO BE SOLVED: To provide a membrane evaporator in which heat loss caused by transfer of sensible heat is reduced and also a device itself is miniaturized by increasing the permeation velocity of vapor in a membrane distillation cell. SOLUTION: A pressure regulator 128 on an original liquid flow path side and or a decompression regulator on a cooling water flow path side is provided in a membrane evaporator consisting of a membrane distillation cell 100, an original liquid pump 110, a heater 112 for heating original liquid 108, a cooling water pump 118 and a cooler 120 which cools cooling water 122. In the membrane distillation cell 100, an original liquid chamber 104 in which original liquid 114 flows and a cooling water chamber 106 in which cooling water 122 flows are formed by using a hydrophobic porous membrane 102 for a partition. Therefore, flash evaporation action is caused in a hydrophobic porous membrane 102 on the original liquid chamber 104 side and the permeation velocity of vapor per unit membrane area is drastically increased. Accordingly, heat loss caused by heat release is reduced and membrane area is reduced and the device is miniaturized.

4. 发明专利

JPH08226996A MEMBRANE MODULE AND MEMBRANE EVAPORATION AND CONDENSATION DEVICE 失效
公开(公告)号：JPH08226996A
公开(公告)日：1996-09-03
申请号：JP3334895
申请日：1995-02-22
申请人： HITACHI LTD
发明人： OTAKE ATSUSHI , FUNABASHI KIYOMI , KUROKAWA HIDEAKI , MATSUMOTO TAKAYUKI , IZUMIDA TATSUO
IPC分类号： G21F9/08 , B01D61/00 , C02F1/44
摘要： PURPOSE: To make possible the replacement of hydrophobic porous membranes in a short time without spilling out residual raw water. CONSTITUTION: The device consists of a containment vessel 1, a raw water supplying system 2, an annular membrane module 3, a cooling water supplying system 4, a raw water discharging system 22 and a cooling water discharging system 42. Radioactive waste fluid is used as raw water. The heated raw water is supplied from the raw water supplying system 2 and is evaporated and condensed in the annular membrane module 3 to obtain clean water from the cooling water discharging system 42. Since the raw water supplying and discharging systems are placed in the upper part of the device, it is necessary only to pull up the raw water supplying system 2 and the membrane module 3 at the same time during the replacement of the membrane modules. Moreover, the raw water remaining in the device is less likely to spill out during working.

5. 发明专利

JPH06180394A COMPRESSION TREATMENT OF RADIOACTIVE WASTE 失效
公开(公告)号：JPH06180394A
公开(公告)日：1994-06-28
申请号：JP33409492
申请日：1992-12-15
申请人： HITACHI LTD
发明人： MATSUDA MASAMI , NISHI TAKASHI , IZUMIDA TATSUO
IPC分类号： G21F9/30 , G21F9/36
摘要： PURPOSE:To allow the compression treatment of radioactive waste without requiring compression press equipped with a special mechanism such as longitudinal drawing or triaxial compression. CONSTITUTION:In compression treatment where compressed radioactive waste is contained in a container 2, radioactive waste 1 is temporarily contained in a compression container 3 having an outer diameter shorter than the inner diameter of the container 2 and then the radioactive waste 1 is compressed, together with the compression container 3, by means of a compression press 6 having an inner diameter at the press part thereof shorter than that of the container 2.

6. 发明专利

JPH02162298A SOLIDIFICATION OF WASTE 失效
公开(公告)号：JPH02162298A
公开(公告)日：1990-06-21
申请号：JP31641388
申请日：1988-12-16
申请人： HITACHI LTD , HESCO
发明人： IZUMIDA TATSUO , NISHI TAKASHI , BABA TSUTOMU , CHINO KOICHI , KIUCHI YOSHIMASA , TSUCHIYA HIROYUKI
IPC分类号： G21F9/16 , G21F9/00
摘要： PURPOSE:To make it unnecessary to accelerate a hardening speed by adding a cement typed hardening agent and to obtain a low cost and high safety solidified body, by using an inorganic water absorbent of which absorption speed is greater than a dissolving speed, in a paste, of a water soluble organic substances. CONSTITUTION:A condensed waste liquid 1 is fed to a dryer mill 2, where inorganic substances such as a sodium nitrate are dried and milled, and an pelletized by a pelletizer 3 as a next processing stage. A constant amount of pellets 4 is fed to a solidifying bin 7 by a measuring feeder 6 of pellets after a temporary storage in a pellet receiver 5. Constant amounts of a water setting hardener 8, an inorganic water absorbent 9 and water 10 are fed to a kneader 15 through tanks 11 to 13 and measuring feeders 14, respectively, and a paste 16 to be solidified, is produced by a mixing vane 17. The paste 16 is injected into the bin 7 which is filled with the pellets, through a valve 13, to fill out spaces among the pellets. A solidified body 18 is produced by statically placing and curing the bin 7. When the controlling of the paste 16 temperature is required, a heat exchanger 12 placed at the kneader 15, is operated.

7. 发明专利

JPH02141698A SOLIDIFICATION OF RADIOACTIVE WASTE AND ITS DEVICE 失效
公开(公告)号：JPH02141698A
公开(公告)日：1990-05-31
申请号：JP29689688
申请日：1988-11-24
申请人： HITACHI LTD
发明人： NISHI TAKASHI , IZUMIDA TATSUO , FUNABASHI KIYOMI , BABA TSUTOMU , CHINO KOICHI
IPC分类号： G21F9/16 , G21F9/00 , G21F9/30 , G21F9/36
摘要： PURPOSE:To lower the leaching rate of radioactivity and shorten the time required for a radioactive contamination to reach the surface of a solidified body by adapting a wetting treatment to a concrete surface of a container prior to injecting a water setting solidifying agent into the container of which inner surface is lined with a concrete layer and the like. CONSTITUTION:First of all, water is filled in a dry concrete container for a predetermined period and then the water is drained by tilting the container to make the dry container be a wet concrete one. After that, an appropriate amount of radioactive solid wastes are filled into the wet concrete container. Then, a water setting solidifying agent in a form of a paste mixed fully with water is injected. The agent is injected to a level several centimeters above an uppermost level of the waste in the container and then a concrete-made floating lid is placed on it and finally the agent is poured on the lid and is left for about one month at a condition of a wet curing. With this procedure, moving-around of radioactive nuclides caused by a capillarity permeation of mixing water can be prevented, and a lowering of a leaching rate of a radioactivity and the like can be attained.

8. 发明专利

JPH01114799A METHOD FOR CONCENTRATING WASTE NITRIC ACID SOLUTION 失效
公开(公告)号：JPH01114799A
公开(公告)日：1989-05-08
申请号：JP27377887
申请日：1987-10-29
申请人： HITACHI LTD
发明人： IZUMIDA TATSUO , SASAHIRA AKIRA , TAKAHASHI MASANORI , KAWAMURA FUMIO
IPC分类号： G21F9/08 , G21F9/00
摘要： PURPOSE:To decrease the concn. of the nitric acid in a waste nitric acid liquid contg. radioactive nuclides in large quantity by a simple technique in a short period of time by subjecting the high-concn. nitric acid after vacuum concentration further to vacuum evaporation while supplying heat-decomposable aq. alkaline soln. CONSTITUTION:The waste nitric acid liquid contg. the radioactive nuclides is supplied from a raw material nitric acid tank 6 into a nitric acid concentrating vessel 1 and is heated by a heater 4. The concentration system supplies the waste liquid from the tank 6 continuously into the vessel 1 evacuated to a reduced pressure by a vacuum evacuation device 10 at the point of the time when the vapor begins to condense in a condenser 8 by passing a mist separator 3 on progressing of the evaporation in said vessel. The system continues the vacuum evaporation while maintaining the specified evaporation rate from the vessel 1 by controlling a power supply 5 for heating the heater. The water and nitric acid evaporating from the vessel 1 are condensed in the condenser 8, are further refined in a nitric acid refining device 11 and are separated to the recovered water and the recovered nitric acid. The concentrated vessel liquid 2 is thereby linearly increased in the concn. of the metal ions of the radioactive nuclides. The concn. of the nitric acid is sharply decreased if the vacuum evaporation is further continued while an aq. soln. of strongly alkaline aliphat. amine is supplied to the vessel from an aq. alkaline soln. tank 15.

9. 发明专利

JPS63186193A HEATING VAPORIZING PROCESSING METHOD OF RADIOACTIVE NITRIC-ACID WASTE LIQUOR 失效
公开(公告)号：JPS63186193A
公开(公告)日：1988-08-01
申请号：JP1609887
申请日：1987-01-28
申请人： HITACHI LTD
发明人： NISHI TAKASHI , IZUMIDA TATSUO , SASAHIRA AKIRA , KAWAMURA FUMIO
IPC分类号： G21F9/08 , G21F9/00 , G21F9/06

10. 发明专利

JPS62293199A SEMENT SOLIDIFYING BODY OF RADIOACTIVE WASTE 失效
公开(公告)号：JPS62293199A
公开(公告)日：1987-12-19
申请号：JP13595686
申请日：1986-06-13
申请人： HITACHI LTD
发明人： KAWAMURA FUMIO , BABA TSUTOMU , CHINO KOICHI , IZUMIDA TATSUO
IPC分类号： G21F9/30 , C04B22/06 , G21F9/00

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