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1. 发明专利

JPH09133784A REPAIR METHOD FOR REACTOR PRIMARY PIPING 失效
公开(公告)号：JPH09133784A
公开(公告)日：1997-05-20
申请号：JP28891095
申请日：1995-11-07
申请人： HITACHI LTD
发明人： HOSOKAWA HIDEYUKI , UETAKE NAOTO , HARA TERUO
IPC分类号： G21C19/02 , G21D1/00 , G21F9/28
摘要： PROBLEM TO BE SOLVED: To restrain radioactive nuclide to be again deposited on the piping where the radioactive nuclide of a nuclear power plant under operation is already deposited. SOLUTION: The primary piping of a nuclear power plant is cut at the area where a coolant containing radioactive nuclide is made to flow and a dose is already high at a step S2, and a device to collect radioactive waste liquid generated with a decontamination device and at a decontamination process is connected thereto at a step S3. Then, the inner surface of the piping is decontaminated at steps S4 and S5. Subsequently, a heating device is installed on the piping at steps S6 for the heating thereof in a gaseous phase containing 0.1% or more of oxygen, thereby forming a dense oxidized film having thickness between 1nm and 100nm at a step S7. After the heating device and the radioactive waste liquid collection device are demounted at steps S8 and S9, the piping is restored to an original state at a step S10. According to this construction, a coolant containing radioactive nuclicle can be prevented from being deposited directly on the metal surface of the piping, and the deposition thereof after reuse on the metal surface can be restrained.

2. 发明专利

JPH0720277A REACTOR WATER CONTROL METHOD FOR BWR PLANT, LOW RADIOACTIVE CONCENTRATION REACTOR WATER BWR PLANT AND FUEL CLADDING TUBE FOR BWR 失效
公开(公告)号：JPH0720277A
公开(公告)日：1995-01-24
申请号：JP16356393
申请日：1993-07-01
申请人： HITACHI LTD
发明人： UETAKE NAOTO , KONDO MASAYOSHI , NAGASE MAKOTO , HOSOKAWA HIDEYUKI , HARA TERUO , ASAKURA YAMATO , OSUMI KATSUMI , AKAMINE KAZUHIKO , YAMANE KOICHI
IPC分类号： G21C3/06 , G21C17/022 , G21C19/30 , G21C19/307 , G21D1/00 , G21D3/08
摘要： PURPOSE:To allow efficient reduction of radioactivity in reactor water even if fuel rods, to which metal ions scarcely adhere, are loaded by accelerating adhesion of crud to a newly loaded fuel and stopping the adhering operation of clad when a predetermined target adhesion is reached. CONSTITUTION:When a pressure vessel 10 of reactor is loaded with a new Zr liner fuel 13 and the operation is started, an electrolytic iron injector 14 is operated simultaneously to produce iron crud. Electrolytic iron is injected 15 into supply water while sustaining the injection concentration at 2ppb and the injection is stopped when the total quantity of iron reaches 5X10 g/cm the sum of surface area of all newly loaded fuel rods. Furthermore, an anion-exchange resin in a desalting condenser 5 is partially rendered to Na type and the condensate is passed. The pH of supply water is then increased to 7-9 and the operation is sustained for a while even after the injection of iron crud is interrupted. Water supply to a resin tower is then stopped and switching is made to other resin tower and a cycle of operation is ended while lowering the pH below 7. Consequently, metal ions adhere well to the fuel and the radioactivity in the reactor water is reduced.

3. 发明专利

JPS5165294A Hasonnenryokenshutsuhoho 失效
公开(公告)号：JPS5165294A
公开(公告)日：1976-06-05
申请号：JP13816374
申请日：1974-12-02
申请人： Hitachi Ltd
发明人： OGUMA MASAOMI , MAKI HIDEO , MORI RYUJI , WATABIKI MINORU , YAMAMOTO TAKANORI , HARA TERUO , TAKAGI HIROSHI , MARU AKIRA
IPC分类号： G01T1/167 , G01N23/00 , G21C17/06 , G21C17/07

4. 发明专利

JPS62215865A METHOD AND APPARATUS FOR MEASURING PH 失效
公开(公告)号：JPS62215865A
公开(公告)日：1987-09-22
申请号：JP6007286
申请日：1986-03-18
申请人： HITACHI LTD
发明人： KARASAWA HIDETOSHI , HARA TERUO , ASAKURA YAMATO
IPC分类号： G01N31/00 , G01N17/00 , G01N21/73 , G01N27/26
摘要： PURPOSE:To stably and accurately measure pH in a wide temp. range without receiving the effect of water quality, by calculating the elution speed of a metal ion in the metal in a solution to be measured and calculating pH of the solution to be measured on the basis of said speed. CONSTITUTION:Flow passage valve 1, 21 are opened by the operation of a valve control device 7 receiving the control signal of the main control device 8 of a pH measuring apparatus and the temp. of sample water branched from the flow passage system of high temp. water is measured by the thermometer 2 of a measuring line 42. Further, the concn. of dissolved oxygen is measured by dissolved oxygen densitometer 3 for high temp. and the temp. of sample water and the concn. of oxygen are applied to the control device 8. Next, electric conductivity is measured by an electric conductivity meter 5 and sample water is made to flow to an elution column 4 packed with metal oxide and metal ion corresponding to pH is eluted from a metal. The conductivity of sample water when the metal ion is eluted is measured by an electric conductivity meter 10 and the measured value is outputted to the control device 8. The metal ion is collected by a high temp. filter 6 and, thereafter, high temp. water is returned to the flow passage system 41 to accurately measure pH.

5. 发明专利

JPS54105683A NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPS54105683A
公开(公告)日：1979-08-18
申请号：JP1144878
申请日：1978-02-06
申请人： HITACHI LTD
发明人： HARA TERUO , YAMAMOTO TAKANOBU , WAKASHIMA KIWA , KUBO TOSHIO
IPC分类号： G21C3/34
摘要： PURPOSE:To prevent from friction scratches on sheath tube outer circumference surface by making a part in contact with nuclear fuel rod of spacer as a revolving body. CONSTITUTION:Spacer 2 arranges wire 22 with spring and straight wire 21 in a lattice shape within spacer band 6 which fixed the outer circumference of a plurality of nuclear fuel rods 3. Revolving body 23 in contact with the outer circumference surface of sheath tube 14 of respective nuclear fuel rod 3 is inserted into wire 22 with spring and straight wire 21 to form the contact section. Both ends of mounting section of revolving body 23 of wire 21 with spring are somewhat bent in a bow shape to provide elasticity. Revolving body 23 is forming the cross section of V shape groove in the outer axial direction which rubs to the outer circumference axial direction of nuclear fuel rod 3. For mounting nuclear fuel rod, revolving body 23 is revolving even nuclear fuel rod 3 and revolving body 23 are in contacting, which can be mounted without scratching nuclear fuel rod 3 owing to having elastic wire.

6. 发明专利

JPS5436469A NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPS5436469A
公开(公告)日：1979-03-17
申请号：JP10164177
申请日：1977-08-26
申请人： HITACHI LTD
发明人： HOSOKAWA TAKANORI , HARA TERUO , ITOU KENICHI
IPC分类号： G21C3/06 , G21C3/34
摘要： PURPOSE:To provide a wear proof coating material for both surfaces of the external cladding tube surface of nuclear fuel assembly or the external surface of cladding tube and the spacer surface for preventing the cladding tube from the damage caused by fretting corrosion.

7. 发明专利

JPS52119795A NUCLEAR FUEL ASSEMBLY 失效
公开(公告)号：JPS52119795A
公开(公告)日：1977-10-07
申请号：JP3447576
申请日：1976-03-31
申请人： HITACHI LTD
发明人： HARA TERUO , YAMAMOTO TAKANORI
IPC分类号： G21C3/33 , G21C3/16
摘要： PURPOSE:A nuclear fuel assembly structured not to cause the breakage of a cladding pipe even if the spacer contacts the nuclear fuel rod by means of the fixation installing an intermediate terminal tap on the nuclear fuel rod.

8. 发明专利

JPH10197672A FUEL CLADDING TUBE FOR BWR 失效
公开(公告)号：JPH10197672A
公开(公告)日：1998-07-31
申请号：JP3505998
申请日：1998-02-17
申请人： HITACHI LTD
发明人： UETAKE NAOTO , KONDO MASAYOSHI , NAGASE MAKOTO , HOSOKAWA HIDEYUKI , HARA TERUO , ASAKURA YAMATO , OSUMI KATSUMI , AKAMINE KAZUHIKO , YAMANE KOICHI
IPC分类号： G21C3/06 , G21C3/20
摘要： PROBLEM TO BE SOLVED: To efficiently adhere metal ions and the like on an initial loading fuel assembly and lower radioactivity in reactor water by forming the layer of metal oxide on the outer surface of a cladding tube, and depositing and adhering radioactive substance in reactor water. SOLUTION: A fuel cladding tube 40 has a fuel cladding tube body 41, the liner layer 42 of the inner surface thereof, and the layer 43 of metal oxide of the outer surface of the cladding tube body 41. The liner layer 42 is formed of pure zirconium, and inward lined on the cladding tube body 41. The layer 43 of metal oxide is formed of e.g. beryllium oxide, and formed on the whole outer surface of the cladding tube body 41. A special device for adhering metal ions and the like is not used for initial loading fuel, metal ions and the like are adhered on a fuel surface good, and radioactivity in reactor water can be reduced. Because berylium oxide has good heat conductivity, even if the layer 43 is formed on the outer surface of the fuel cladding tube body 41, temperature increase in the cladding tube 40 is not influenced.

9. 发明专利

JPH0862384A DOSAGE REDUCING METHOD FOR BOILING WATER REACTOR 失效
公开(公告)号：JPH0862384A
公开(公告)日：1996-03-08
申请号：JP19512994
申请日：1994-08-19
申请人： HITACHI LTD
发明人： HOSOKAWA HIDEYUKI , NAGASE MAKOTO , HARA TERUO
IPC分类号： G21D1/00
摘要： PURPOSE: To suppress the adhesion of a radioactive material to reduce the surface dosage by forming a layer of a metal oxide to which the radioactive material is hardly adhered on the primary cooling water contact part of structural member. CONSTITUTION: The surface of a structural member is finished into a mirror surface by buffing or electrolytic polishing, and a film of a metal oxide having corundum structure is formed on the water contact part most outside surface of the mirror surface. The metal oxide of corundum structure works as an insulating body to extremely reduce the permeability of radioactive ion, and an ion exchange reaction is made difficult to occur. Since the surface is polished into a mirror surface, the oxide film of corundum structure can be formed in the state where the crack of the film accompanying increase in compression stress at the growth of the oxide film is minimized, and the suppressing effect is enhanced. The adhesion of radioative can be thus suppressed to the surface coming into contact with primary cooling water of a structural member such as the pressure vessel outer piping or pump of a core water recirculating system or core water purifying system, and the surface dosage cart be reduced to reduce the exposure of a worker engaged in maintenance and inspection.

10. 发明专利

JPH06180385A FUEL CLADDING TUBE TESTER 失效
公开(公告)号：JPH06180385A
公开(公告)日：1994-06-28
申请号：JP33410092
申请日：1992-12-15
申请人： HITACHI LTD
发明人： KONDO MASAYOSHI , UETAKE NAOTO , HARA TERUO , ASAKURA YAMATO
IPC分类号： G21C17/00 , B01J3/04 , G21C3/06 , G21C17/06
摘要： PURPOSE:To allow the simulation of the adhesion of impurities to an actual fuel cladding tube, while to facilitate the analysis of adhering state of impurities by loading a plurality of fuel cladding tubes, and to facilitate the test of the effect of surface conditions by varying the surface conditions of the fuel cladding tube. CONSTITUTION:Fuel cladding tube 2 is mounted on a stainless steel cylinder 1 simulating a fuel rod of nuclear power plant and then they are brought into tight contact under operating conditions similar to those of actual plant by taking advantage of the difference of thermal expansion.

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