US20080085194A1 - Method of removing retainer of jet pump and jet pump - Google Patents

Method of removing retainer of jet pump and jet pump Download PDF

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Publication number
US20080085194A1
US20080085194A1 US11/781,524 US78152407A US2008085194A1 US 20080085194 A1 US20080085194 A1 US 20080085194A1 US 78152407 A US78152407 A US 78152407A US 2008085194 A1 US2008085194 A1 US 2008085194A1
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US
United States
Prior art keywords
retainer
jet pump
bolt
reactor
underwater
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/781,524
Other languages
English (en)
Inventor
Hajime Mori
Kunihiko Kinugasa
Yukiaki Hidaka
Masaru Ukai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Assigned to KABUSHIKI KAISHA TOSHIBA reassignment KABUSHIKI KAISHA TOSHIBA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIDAKA, YUKIAKI, KINUGASA, KUNIHIKO, MORI, HAJIME, UKAI, MASARU
Publication of US20080085194A1 publication Critical patent/US20080085194A1/en
Priority to US12/699,624 priority Critical patent/US20100206147A1/en
Priority to US13/489,146 priority patent/US8724767B2/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
    • G21C19/207—Assembling, maintenance or repair of reactor components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/24—Promoting flow of the coolant
    • G21C15/243—Promoting flow of the coolant for liquids
    • G21C15/25—Promoting flow of the coolant for liquids using jet pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • Y10T83/0467—By separating products from each other

Definitions

  • the present invention relates to a method of removing a retainer of a jet pump and also relates to a jet pump after removal of the retainer, the method being for removing the retainer of a jet pump provided in a reactor pressure vessel of a boiling water reactor to circulate a cooling water to a reactor core or for removing a bolt for fastening the retainer.
  • a so-called jet pump system combining a recirculating pump disposed outside a reactor pressure vessel and jet pumps provided in the reactor pressure vessel is employed in a boiling water reactor so as to increase power density.
  • the outside recirculation system includes a plurality of jet pumps disposed in the reactor pressure vessel and a recirculating pump disposed outside the reactor pressure vessel.
  • the jet pumps serve to form cooling water sent from the recirculating pump into jet streams and forcibly send the cooling water from a reactor core lower plenum below a reactor core portion to the reactor core portion while taking in the reactor water around the jet pumps to thereby carry out the forced recirculation of the reactor coolant in the reactor pressure vessel.
  • the jet pump of the boiling water reactor employing this jet pump system will be described hereunder with reference to FIGS. 9 to 12 .
  • FIG. 9 is a vertical cross-sectional view schematically showing a structure of the boiling water reactor.
  • reactor coolant 2 and a reactor core 3 are housed in a reactor pressure vessel 1 .
  • the reactor core 3 is formed of a plurality of fuel assemblies, control rods, and the like, not shown, and is housed in a core shroud 10 .
  • the reactor coolant 2 circulates upward through the reactor core 3 .
  • the reactor coolant 2 constitutes a two-phase flow of water and steam as its temperature is increased by nuclear reaction heat of the reactor core 3 .
  • the coolant 2 in the state of the two-phase flow flows into a steam-water separator 4 disposed above the reactor core 3 and is separated into water and steam there.
  • the steam is then introduced into a steam dryer 5 disposed above the steam-water separator 4 and becomes dry steam.
  • the dry steam is transferred to a steam turbine, not shown, through a main steam pipe 6 connected to the reactor pressure vessel 1 and is used for electric power generation.
  • the separated water flows through a downcomer portion 7 between the reactor core 3 and the reactor pressure vessel 1 and flows down below the reactor core 3 .
  • Control rod guide tubes 8 are disposed below the reactor core 3 and control rods are inserted into or withdrawn from the reactor core 3 through the control rod guide tubes 8 .
  • a control rod drive mechanism 9 is disposed under the control rod guide tubes 8 and controls insertion and withdrawal of the control rods into and from the reactor core 3 .
  • a plurality of jet pumps 11 are arranged with a space uniformly in a circumferential direction.
  • a recirculating pump is disposed outside the reactor pressure vessel 1 .
  • the recirculating pump, the jet pumps 11 , and recirculation piping disposed therebetween constitutes a recirculation system.
  • the recirculating pump feeds drive water to the jet pumps 11 and forced circulation of the coolant 2 into the reactor core is carried out by the action of the jet pumps 11 .
  • FIG. 10 is an enlarged view of an essential portion of FIG. 9 .
  • the jet pumps 11 have a riser pipe 12 .
  • the riser pipe 12 is fixed to the reactor pressure vessel 1 through a riser place 20 and introduces the coolant 2 fed from a recirculation inlet nozzle 13 of the recirculating pump into the reactor.
  • a pair of elbows 15 are connected to an upper portion of the riser pipe 12 through a transition piece 14 .
  • Inlet throats 17 are respectively connected to the elbows 15 through mixing nozzles 16 .
  • the paired inlet throats 17 are respectively connected to diffusers 18 .
  • the mixing nozzles 16 jet the coolant 2 , the reactor water around the nozzles 16 is taken in at this time, and the jetted coolant 2 and the taken water are mixed in the inlet throats 17 .
  • the elbow 15 , the mixing nozzle 16 , and the inlet throat 17 are integral with each other so as to form an inlet mixer 51 .
  • a pair of ear portions 21 are formed, respectively. These ear portions 21 protrude upward, and groove portions 22 are formed on inner sides of upper end portions of the ear portions 21 .
  • a pair of jet pump beams 23 are fixed to the groove portions 22 with their opposite end portions fitted in the groove portions 22 .
  • FIG. 11 is a side view showing a fitted state of the jet pump beam 23 and FIG. 12 is a plan view of FIG. 11 .
  • a screw hole is formed in a vertical direction at the center of the jet pump beam 23 .
  • a head bolt 28 is screwed.
  • a hexagon head is formed at an upper end of the head bolt 28
  • a hemispherical head is formed at a lower end.
  • the elbow 15 is formed with a mount portion having a horizontal upper end surface and the mount portion is formed with a counterbored hole. In the counterbored hole, the hemispherical head of the head bolt 28 is fitted through a spherical washer.
  • the inlet mixer 51 is not secured to the reactor pressure vessel 1 , and therefore, the inflow water pressure of the drive water fed through the riser pipe 12 acts on the upper end portion of the inlet mixer 51 . Moreover, the reaction force to the jet water pressure of the drive water jetted from the mixing nozzle 16 into the diffuser 18 also acts upward. In order to resist such load, the head bolt 28 may be screwed into the jet pump beam 23 .
  • a downward load is applied to an upper end portion of the elbow 15 through the head bolt 28 , and magnitude of the load is determined by a relationship with the upward load due to the reaction force and the like of the drive water.
  • a keeper 39 is detachably fitted over the hexagon head of the head bolt 28 .
  • the keeper 39 is secured onto a plate 40 by means of spot welding.
  • the plate is in a square shape and is fixed to an upper surface of the jet pump beam 23 by means of two bolts.
  • a retainer 41 is fixed, below the head bolt 28 , to the elbow 15 by a retainer mounting bolt 42 so that the inlet mixer 51 , the head bolt 28 , and the jet pump beam 40 can be handled as an integral body in removing the inlet mixer 51 .
  • the retainer 41 may lose its retaining force due to initial looseness of the retainer mounting bolt 42 or permanent set of the retainer 41 during the operation to come in contact with members therearound and wear away due to the oscillation caused by the circulation of the coolant. If this wearing proceeds, the retainer 41 may fall down into the reactor to cause damage fatal to the operation of the rector.
  • the retainer 41 has a function of fixing the head bolt 28 to the elbow 15 in removing the inlet mixer 51 after starting the operation of the reactor. If the retainer 41 is not installed during the normal operation, no functional problem will be caused. On the contrary, if the retainer 41 and the retainer mounting bolt 42 are damaged after the starting of the operation of the reactor, they may constitute falling objects.
  • the present invention was conceived in consideration of the circumstances mentioned above, and an object of the invention is to provide a method of removing a jet pump retainer for easily carrying out a recovery work for securing a sufficient function of a jet pump and for removing the retainer under such an environment that sufficient shielding effect of water can be effected in order to minimize exposure of a worker to radiation.
  • a method of removing a jet pump retainer including the steps of cutting the retainer or a bolt for fastening the retainer through an underwater-remote control to remove the bolt and removing the retainer, through an underwater-remote control, disposed to a lower portion of a pump beam of a jet pump provided in a reactor pressure vessel of a boiling water reactor to circulate cooling water to a reactor core.
  • a jet pump including a riser, a diffuser, and an inlet mixer positioned between the riser and the diffuser and provided in a reactor pressure vessel of a boiling water reactor having a retainer disposed for handling a jet pump beam and a head bolt for connecting the inlet mixer and the riser by fastening as an integral body, the jet pump circulating cooling water to a reactor core, wherein the retainer provided to a lower portion of the pump beam of the jet pump or a bolt for fastening the retainer is cut through an underwater-remote control to remove the bolt and the retainer is removed through an underwater-remote control.
  • recovery work for securing a sufficient function of a jet pump can be carried out easily, and the retainer can be removed under such an environment that sufficient shielding effect of water is obtained in order to minimize exposure of a worker to radiation.
  • FIG. 1 is a side view showing a cut position in a first embodiment of the present invention
  • FIG. 2 is a side view showing a cut position in a second embodiment of the invention.
  • FIG. 3 is a schematic view showing a mounting bolt removing device according to the second embodiment of the invention.
  • FIG. 4 is an enlarged sectional view of the retainer mounting bolt removing device shown in FIG. 3 ;
  • FIG. 5 is a schematic view showing a bolt cutting device according to a third embodiment of the invention.
  • FIG. 6 is a schematic view showing a cutting device in a fourth embodiment of the invention.
  • FIG. 7 is a schematic view showing a retainer handling device in a fifth embodiment of the invention.
  • FIG. 8 is a view showing a structure of a relevant portion of a jet pump after removal of a retainer by a retainer removing method of the invention
  • FIG. 9 is a view showing an overall structure of a boiling water reactor
  • FIG. 10 is a schematic view showing a structure of a jet pump
  • FIG. 11 is a view showing an assembled structure of a jet pump beam.
  • FIG. 12 is a plan view of FIG. 11 .
  • FIGS. 1 to 8 Like reference numerals are added to members or portions corresponding to those in the description of the prior art of FIGS. 9 to 12 to avoid repetition of the description.
  • This embodiment mentions cut positions of a retainer 41 to be removed and a retainer mounting bolt 42 in a method of removing the jet pump retainer.
  • the method includes the steps of cutting the retainer 41 or a retainer mounting bolt 42 for fastening the retainer through an underwater-remote control to remove the retainer mounting bolt 42 and removing the retainer through the underwater-remote control, the retainer 41 being disposed below a jet pump beam 23 of a jet pump 11 arranged in a reactor pressure vessel of a boiling water reactor to circulate cooling water to a reactor core.
  • FIG. 1 is a side view showing a cut position of the retainer 41 to be removed by the retainer removing method according to the embodiment and the retainer mounting bolt.
  • the retainer 41 is positioned below the jet pump beam 23 .
  • the retainer 41 is fastened to the elbow 15 by the retainer mounting bolt 42 .
  • Bolt hexagonal side surfaces of the retainer mounting bolt 42 are welded to a side surface of the retainer 41 so as to prevent the bolt 42 from loosening.
  • FIG. 1 shows a cut area (A) for cutting the welded portion of the retainer mounting bolt 42 by hatching.
  • the cut area (A) includes a portion of the retainer 41 and at least a part of the hexagonal portion 42 a of the retainer mounting bolt 42 as shown in the drawing.
  • various cutting methods including electrical discharge machining, mechanical machining, and the like may be employed.
  • the retainer mounting bolt 42 is removed and the retainer 41 is then removed.
  • FIG. 2 is a side view showing a cut position of the retainer 41 to be removed by the retainer removing method according to a second embodiment of the invention and the retainer mounting bolt 42 .
  • the retainer 41 is positioned below the jet pump beam 23 .
  • the retainer 41 is fastened to the elbow 15 by the retainer mounting bolt 42 .
  • Bolt hexagonal side surfaces of the retainer mounting bolt 42 are welded to a side surface of the retainer 41 so as to prevent the bolt 42 form loosening.
  • FIG. 2 shows, with hatching, a cut area (B) for cutting the retainer 41 around the retainer mounting bolt 42 .
  • this second embodiment is different from the first embodiment in that the welded portion connecting the retainer mounting bolt 42 and the retainer 41 is not removed.
  • a flange flanged portion
  • a portion constituting the flange around the retainer mounting bolt is cut so as to have such an outside diameter as not to interfere with the elbow 15 .
  • FIG. 3 is a schematic view showing a retainer mounting bolt removing device 30 for removing the retainer 41 after the cutting (cut retainer 41 a ) and the mounting bolt 42 .
  • the retainer mounting bolt removing device 30 includes a frame 77 that can be hung down above the jet pump 11 , and a drive portion for vertically driving a wrench portion 75 and a drive portion for laterally driving a wrench portion 76 mounted to the frame 77 .
  • a base 78 mounted onto the jet pump 11 is provided below the frame 77 and a bolt retainer 70 , a wrench portion 71 , and a bolt turning portion retaining portion 74 are provided on a side of the base 78 .
  • the wrench portion 71 can be moved vertically and laterally and positioned in a bolt removing position at the elbow 15 .
  • FIG. 4 is an enlarged sectional view of the bolt turning portion retaining portion 74 of the retainer mounting bolt removing device 30 shown in FIG. 3 .
  • the wrench portion 71 is provided to a tip end of the bolt turning portion retaining portion 74 through a sleeve 73 and a spring (compression coil spring) 72 is also provided.
  • the wrench portion 71 is engaged with the retainer mounting bolt 42 and the spring 72 is pressed by the retainer mounting bolt 42 .
  • the retainer mounting bolt 42 and the cut retainer 41 a are connected by means of welding. Therefore, after the cutting, the wrench portion 71 of the retainer mounting bolt removing device 30 is set on the bolt hexagonal surface, the retainer mounting bolt 42 is turned slightly to create a clearance between the cut retainer 41 a and a side surface of the elbow 15 , and the bolt retainer 70 is then inserted into the clearance. In this way, the retainer mounting bolt 42 is pinched between the wrench portion 71 and the bolt retainer 70 , and therefore, can be removed without falling down.
  • FIG. 5 is a schematic view showing a bolt cutting device 31 for cutting the retainer 41 or the retainer mounting bolt 42 in the reactor pressure vessel 1 .
  • the bolt cutting device 31 includes a drive motor for laterally driving a processing (working) portion 63 and a drive motor for forward-backward driving a processing portion 62 provided to an upper plate 60 , and a mounted processing portion 65 is movable longitudinally and laterally.
  • an upper plate vertical drive motor 64 is provided to a positioning plate 61 and the mounted positioning plate 61 is movable vertically.
  • the bolt cutting device 31 is disposed on the jet pump beams 23 by using the head bolts 28 screwed into the jet pump beams 23 disposed in the reactor as guide portions as shown in the drawing. After the disposition, the processing portion 65 of the bolt cutting device 31 is moved to a position of the retainer mounting bolt 42 to be subjected to processing by the respective drive motors, i.e., the processing portion forward-backward drive motor 62 , the processing portion lateral drive motor 63 , and the upper plate vertical drive motor 64 to carry out the processing of the turn-stop of the retainer mounting bolt 42 or the retainer 41 .
  • the respective drive motors i.e., the processing portion forward-backward drive motor 62 , the processing portion lateral drive motor 63 , and the upper plate vertical drive motor 64 to carry out the processing of the turn-stop of the retainer mounting bolt 42 or the retainer 41 .
  • the bolt cutting device 31 is removed. Thereafter, the retainer mounting bolt 42 is removed and the retainer 41 is then removed.
  • FIG. 6 is a schematic view showing a cutting device 32 for cutting the retainer 41 or the retainer mounting bolt 42 in a pool 33 .
  • the cutting device 32 is structured to be able to operate a processing portion 80 forward and backward by a processing portion forward-backward drive motor 81 . Moreover, the cutting device 32 is operated upward and downward by a drive mechanism for vertically driving a processing device 82 , and the processing portion 80 of the cutting device 32 is operated leftward and rightward by guide rails 85 .
  • the inlet mixer 51 is removed from the reactor pressure vessel 1 and disposed on a temporary placement table 84 disposed in the pool 33 as shown in the drawing. After the inlet mixer 51 and the elbow 15 are placed on the temporary placement table 84 , the cutting device 32 is mounted thereon by using a positioning pin 83 as a guide. After the placement, the processing portion 80 is moved to a position of the retainer mounting bolt 42 to be processed by the respective drive mechanisms to carry out the turn-stop processing of the retainer mounting bolt 42 or the retainer 41 .
  • the cutting device 32 is removed. Then, the retainer mounting bolt 42 is removed and the retainer 41 is removed.
  • FIG. 7 is a schematic view showing a retainer handling device 34 for handling the retainer 41 from which the retainer mounting bolt 42 has been removed as well as the jet pump beam 23 and the head bolt 28 screwed into the jet pump beam 23 .
  • the retainer handling device 34 grasps a protrusion of the jet pump beam 23 with a hook 90 and a sleeve 91 .
  • a turning mechanism 92 is provided in the sleeve 91 and the turning mechanism 92 is turned separately from the sleeve 91 . Furthermore, the turning mechanism 92 has a shape capable of being engaged with the hexagonal surface of the head bolt 28 . By turning an upper portion of the turning mechanism 92 , it is possible to turn the head bolt 28 screwed into the jet pump beam 23 while grasping the jet pump beam 23 .
  • FIG. 8 is a view showing a structure of a jet pump after a retainer is removed according to another embodiment of the present invention. More specifically, in each of the above embodiments, the jet pump is provided in the reactor pressure vessel of the boiling water reactor to circulate the cooling water to the reactor core.
  • the jet pump includes the riser, the diffusers, and the inlet mixers positioned between the riser and the diffusers and has retainers each disposed for handling the jet pump beam and the head bolt for connecting the inlet mixer and the riser by fastening means as an integral body with the inlet mixer.
  • the drawing shows a structure of the jet pump after the retainer provided below the pump beam of the jet pump or the bolt for fastening the retainer is cut through the underwater-remote control to remove the bolt. The retainer is then removed through the underwater-remote control.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
US11/781,524 2006-07-24 2007-07-23 Method of removing retainer of jet pump and jet pump Abandoned US20080085194A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/699,624 US20100206147A1 (en) 2006-07-24 2010-02-03 Method of removing retainer of jet pump and jet pump
US13/489,146 US8724767B2 (en) 2006-07-24 2012-06-05 Method of removing retainer of jet pump and jet pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-200618 2006-07-24
JP2006200618A JP4580908B2 (ja) 2006-07-24 2006-07-24 ジェットポンプリティーナ取外し方法

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/699,624 Continuation US20100206147A1 (en) 2006-07-24 2010-02-03 Method of removing retainer of jet pump and jet pump

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US20080085194A1 true US20080085194A1 (en) 2008-04-10

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US11/781,524 Abandoned US20080085194A1 (en) 2006-07-24 2007-07-23 Method of removing retainer of jet pump and jet pump
US12/699,624 Abandoned US20100206147A1 (en) 2006-07-24 2010-02-03 Method of removing retainer of jet pump and jet pump
US13/489,146 Active US8724767B2 (en) 2006-07-24 2012-06-05 Method of removing retainer of jet pump and jet pump

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US12/699,624 Abandoned US20100206147A1 (en) 2006-07-24 2010-02-03 Method of removing retainer of jet pump and jet pump
US13/489,146 Active US8724767B2 (en) 2006-07-24 2012-06-05 Method of removing retainer of jet pump and jet pump

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US (3) US20080085194A1 (ja)
JP (1) JP4580908B2 (ja)
TW (1) TWI360135B (ja)

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JP5755562B2 (ja) * 2011-12-22 2015-07-29 株式会社東芝 ジェットポンプ及びジェットポンプビームのボルト固定装置

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US8724767B2 (en) 2014-05-13
JP4580908B2 (ja) 2010-11-17
US20100206147A1 (en) 2010-08-19

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