• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method and apparatus for providing a one-piece plug-in terminal (20) of a jet pump inlet mixer of a boiling water reactor for clamping the inlet mixer and the diffuser (2) to mitigate inlet mixer stream induced vibrations of a BWR jet pump set. The connector clamp includes horizontally protruding flanges (10) with vertical sidewalls projecting toward a lowermost distal end of the inlet mixer. Fastening elements (14) penetrating through the flanges provide a bias load on the diffusers by tightening to press against an upper rim (2a) on the diffuser. One or more flanges can be used. Laterally spaced gaps (P) between the flanges may provide clearance for guide vanes of the diffuser to fit between the flanges.
    公开号:CH704339B1
    申请号:CH02052/11
    申请日:2011-12-27
    公开日:2016-08-31
    发明作者:D Sprague Robin
    申请人:Ge-Hitachi Nuclear Energy Americas Llc；
    IPC主号:
    专利说明:

    Background to the invention
    Field of the invention
    Exemplary embodiments generally relate to nuclear reactors, and more particularly, to a method and apparatus for a one-piece plug-in clamp of a BWR BW pump used to clamp the inlet mixer and diffuser to BWR jet pump set induced vibrations by inlet mixer flow mitigate.
    Related Technology
    A reactor pressure vessel (RPV) of a boiling water reactor (BWR) typically has a generally cylindrical shape and is closed at both ends (for example, by a lower head and a removable upper head). An upper guide is typically spaced above a core plate within the RPV. A core sheath or sheath typically surrounds the core and is supported by a sheath support structure. In particular, the jacket has a generally cylindrical shape and surrounds both the core plate and the upper guide. Between the cylindrical reactor pressure vessel and the cylindrically shaped shell there is a space or annulus.
    In a BWR, hollow tubular jet pumps positioned within the jacket annulus provide the required core core water flow. The upper portion of the jet pump, known as an inlet mixer, is laterally positioned and can be held by conventional jet pump retaining clips. Although conventional jet pump retention stirrups can provide system stiffness that mitigates the vibration of system components, vibration (SJFIV) induced by the inlet mixer plug flow may still occur between the inlet mixers and the diffusers. The inlet mixer SJFIV causes high vibrational stresses during operation of the jet pump set, which may be a major cause of abrasive pump wear problems.
    Many attempts have already been made to reduce the inlet mixer FIV. For example, auxiliary keys have been used on the set screws of headband, labyrinth seals, headband block repair and replacement main wedges. Although these conventional solutions provided some additional system rigidity, none of the solutions attenuate the vibration that occurs at the actual junction between the inlet mixer and the diffuser.
    The object of the invention is to provide a method and a device for a connector terminal of a jet pump inlet mixer, which attenuates the vibration that occurs at the actual junction between the inlet mixer and the diffuser.
    Brief description of the invention
    Exemplary embodiments provide a method and apparatus for a connector terminal of a jet pump inlet mixer. Exemplary embodiments clamp one end of the inlet mixer to the diffuser to mitigate vibration at the actual junction between a lower portion of the inlet mixer and an upper rim of the diffuser. The clamp may comprise a different number of flanges. The flange or flanges may be either monolithically formed as integral or integrated components located near the distal end of a replacement inlet mixer (ie, the replacement inlet mixer may replace an existing inlet mixer), or the flange or flanges may alternatively terminate at the end an existing inlet mixer can be installed. Press studs or keys can be used to create the actual clamping force exerted on the lower portion of the inlet mixer.
    Brief description of the drawings
    The foregoing and other features and advantages of exemplary embodiments will become more apparent from the detailed description of exemplary embodiments with reference to the attached drawings. The accompanying drawings are intended to illustrate exemplary embodiments and should not be construed as limiting the intended scope of the claims. The accompanying drawings are not to be considered as true to scale, unless expressly stated.<Tb> FIG. 1 <SEP> is a perspective view of a conventional jet pump set of a boiling water nuclear reactor (BWR);<Tb> FIG. Fig. 2 is a detail view of a conventional plug connection provided between an inlet mixer and a diffuser of a BWR jet pump set;<Tb> FIG. 3 <SEP> is a cross-sectional view of a conventional connector present between an inlet mixer and a diffuser of a BWR jet pump set;<Tb> FIG. 4 is a detail view of a one-piece connector terminal of an inlet mixer according to an exemplary embodiment;<Tb> FIG. FIG. 5 is a detail close-up view of a one-piece connector terminal of an inlet mixer according to an exemplary embodiment; FIG.<Tb> FIG. FIG. 6 is a detail close-up view of a one-piece connector terminal of an inlet mixer according to an exemplary embodiment; FIG.<Tb> FIG. FIG. 7 is a perspective view of a one-piece connector terminal of an inlet mixer according to an exemplary embodiment installed on a BWR jet pump set; FIG.<Tb> FIG. 8 is a detail close-up view of a one-piece connector terminal of an inlet mixer according to an exemplary embodiment installed on a BWR jet pump set; and<Tb> FIG. FIG. 9 is a flowchart of a method of installing a one-piece connector clamp of a jet pump inlet mixer on a BWR jet pump set according to an exemplary embodiment.
    Detailed description of the invention
    [0008] Detailed exemplary embodiments are disclosed herein. Specific structural and functional details disclosed herein, however, are only representative of the purpose of describing exemplary embodiments. Exemplary embodiments should not be construed as limited only to the embodiments disclosed herein.
    Exemplary embodiments are illustrated in the drawings as examples and are described in detail herein. However, it should be understood that it is not intended to limit example embodiments to the specific forms disclosed. Like reference numerals refer to like elements throughout the description of the figures.
    It will be understood that although the terms "first, first, first, second, second, second," etc. may be used herein to describe various elements, these terms are not limited by these terms should. These terms merely serve to distinguish one element from another. For example, a first element could be termed a second element and, similarly, a second element could be termed a first element without departing from the scope of the exemplary embodiments. As used herein, the term "and / or" includes all combinations of one or more of the associated listed items.
    It goes without saying that when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or intermediate elements may be present. In contrast, there are no intermediate elements when an element is referred to as being "directly connected" or "directly coupled" to another element. Other words used to describe the relationship between elements should be interpreted in a similar fashion (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).
    The terminology used herein is merely for describing particular embodiments and is not intended to limit the exemplary embodiments. As used herein, the singular forms "a," "an," and "the," are also meant to encompass the plural forms unless the context clearly suggests otherwise. It is further understood that the terms "comprising," "comprising," "having," and / or "having," as used herein, the presence of indicated features, integers, steps, operations, elements, and / or But does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.
    It should also be noted that in some alternative implementations, the mentioned functions / actions may take place in an order other than that mentioned in the figures. For example, two figures displayed one behind the other may in fact be executed substantially simultaneously, depending on the functionalities / actions involved, or they may sometimes be executed in reverse order.
    Fig. 1 is a perspective view of a conventional jet pump set 8 of a boiling water reactor (BWR). The main components of the jet pump set 8 include a riser 3 and two inlet mixers 4 inserted into respective diffusers 2. Conventionally, jet pumping brackets 6 are used to stabilize the movement of the inlet mixers 4 and to reduce the movement (ie, the inlet mixer flow induced vibration or FIV) and the leakage of the connector 1 present at the juncture between the inlet mixers 4 and the diffusers 2 is.
    Fig. 2 is a detail view of a conventional connector provided between an inlet mixer 4 and a diffuser 2 of a BWR jet pump set. It should be noted that the lower portion 4a of the inlet mixer 4 is inserted into the upper rim 2a of the diffuser 2 (which also includes guide tabs 2b). The connection point between the inlet mixer 4 and the diffuser 2 is referred to as "plug connection" 1.
    Fig. 3 is a cross-sectional view of a conventional connector 1 provided between an inlet mixer 4 and a diffuser 2 of a BWR jet pump set. The lowermost distal end 4b of the inlet mixer 4 rests on the upper rim 2a of the diffuser 2 to form the connector 1. Conventionally, an inlet mixer FIV may occur in the connector 1 when the tolerances between the distal end 4b of the inlet mixer 4 and the top rim 2a of the diffuser 2 do not exactly match.
    Fig. 4 is a detail view of a one-piece connector terminal 20 of an inlet mixer according to an exemplary embodiment. The clamp 20 comprises a flange 10 in the form of a bow which may be monolithically formed on a lower portion 4a of a replacement inlet mixer 4. The flange 10 may include one or more billet holes 12 in the flange 10. Although only one flange 10 is shown, more than one flange 10 may be provided.
    Alternatively, instead of providing a monolithic flange 10, a projection (not shown) may instead be formed on the lower portion 4a of the inlet mixer 4 or in the vicinity thereof. The hump can then serve as a base to then attach a flange 10 on the hump. The hump may be monolithically formed on the inlet mixer. The hump may include one or more dovetail receiving slots that may receive dovetail tabs that may be used to stabilize the flange on the hump. Other structures for securing a flange to the hump, such as bolts or welds, may also be used.
    Alternatively, to provide a monolithic hump (to serve as a base for a flange), instead of the lower portion 4a of the inlet mixer 4, a flange may be subsequently installed directly at the lower portion 4a of the inlet mixer 4 through other structures. For example, the flange may be bolted or welded directly to the inlet mixer.
    Fig. 5 is a detail close-up view of a one-piece connector terminal 20 of an inlet mixer according to an exemplary embodiment. The flange 10 protrudes horizontally from the lower portion 4a of the inlet mixer. The flange 10 also has a vertical side wall 10b which is substantially parallel to the side walls of the lower portion 4a of the inlet mixer. The vertical side walls 10b project vertically toward a lowermost distal end 4b of the inlet mixer 4. The length of the sidewall 10b may be sized to cause the distal end 10a of the flange 10 to project to a height approximately equal to the lowermost end of the distal end 4b of the inlet mixer 4 (ie, the distal end 10a of the flange 10 may be positioned at about the same height as that of the lowermost distal end 4b of the inlet mixer).
    Note that a gap G may be provided between the vertical side wall 10b of the flange 10 and the distal end of the lower portion 4a and the lowermost distal end 4b of the inlet mixer 4. The gap G may be sized to ensure a snug fit of a lip of an upper rim 2a of the diffuser between the lower portion 4a of the inlet mixer 4 and a portion of an inner surface of the vertical side wall 10b of the flange, as shown in Figs ,
    Fig. 6 is a detail close-up view of a one-piece connector terminal 20 of an inlet mixer according to an exemplary embodiment. This exemplary embodiment includes four flanges 10 rather than just one flange. Each flange may have one or more punch bolt holes 12. A laterally disposed gap P may be included between the flanges to provide clearance for guide tabs 2b of the diffuser when the clamp 20 is installed.
    FIG. 7 is a perspective view of a one-piece connector terminal 20 of an inlet mixer according to an exemplary embodiment installed on a BWR jet pump set 8. The flange 10 may hang over the upper rim 2a of the diffuser. In order to further stabilize the flange 10, the flange 10 may be sized so that it sits firmly between guide tabs 2b of the diffuser 2. The pressing bolt 14 can penetrate through the pressing bolt hole 12 and press against the upper rim 2a of the diffuser. Anti-rotation structures for ensuring that the press studs 14 do not fall back out of the press stud holes 12 may also be used. The anti-rotation structures may include ratchet teeth (on the billet) and retainers (which engage the ratchet teeth and ensure that the billet is not rotating).
    As an alternative to the press stud holes 12 and the press studs 14, a double-acting wedge may be attached to an inner surface of each flange 10 with a cap screw, and the cap screw may be used to bias the wedge against the upper rim 2a of the diffuser. The anti-rotation structures, such as the ratchet teeth and a holder, can also be used with the double-acting wedge and cap screw.
    As an alternative to billets or splines, a press fit (with high accuracy based solely on friction to hold the components together) can be built to provide a secure fit between the lower portion 4a of the inlet mixer, the flange 10, and to provide the upper rim 2a of the diffuser. In addition, a spring member may be used in place of press studs, keys / cap screws, or interference fit to provide a bias load on the diffuser.
    It goes without saying that if only one flange 10 is used or if flanges are used only on one side of the inlet mixer 4, the force generated by the flange 10 and the pressure bolts 14 can cause the inlet mixer 4 is eccentric from the diffuser 2 itself. The eccentricity of the diffuser 2 is acceptable and not detrimental to the overall performance of the BWR jet pump set 8.
    FIG. 8 is a detail close-up view of a one-piece connector terminal 20 of an inlet mixer according to an exemplary embodiment installed on a BWR jet pump set 8. In this embodiment, a plurality of flanges 10 (more precisely, four flanges) are provided. The gap P may provide clearance for guide tabs 2b. It goes without saying that one or more flanges 10 can be provided between each guide flap 2b, instead of using the configuration shown in FIG. Alternatively, more or fewer flanges 10 may be provided as an alternative to FIG. 8.
    FIG. 9 is a flow diagram of a method of installing a one-piece plug connection terminal 20 of a jet pump inlet mixer on a BWR jet pump set 8 according to an exemplary embodiment. In step S30, an arcuate flange 10 is attached to a lower portion 4a of an inlet mixer 4. In step S32, a hole 12 is formed in the flange 10. In step S34, a fastener is inserted into the hole 12. In step S36, the fastener is tightened to apply a bias load to the upper rim 2a of the diffuser.
    Construction materials for the flanges may be the material as for the jet pump inlet mixer. More specifically, the flanges may be made of type 304 or equivalent stainless cast iron or welding steel. All other components may be austenitic stainless steel XM-19, X-750 or equivalent material.
    LIST OF REFERENCE NUMBERS
    [0030]<Tb> 1 <September> connector<Tb> 2 <September> diffuser<tb> 2a <SEP> Upper rim of the diffuser<Tb> 2b <September> guide plates<Tb> 3 <September> riser<Tb> 4 <September> inlet mixer<tb> 4a <SEP> Lower section of the inlet mixer<tb> 4b <SEP> Bottom distal end of inlet mixer<Tb> 6 <September> jet pump bracket<Tb> 8 <September> BWR jet pump set<Tb> 10 <September> flange<tb> 10a <SEP> Distal end of the flange<tb> 10b <SEP> Vertical side wall of the flange<Tb> 12 <September> Press bolt hole<Tb> 14 <September> billets<tb> 20 <SEP> Plug-in terminal of the inlet mixer
    权利要求:
    Claims (10)
    [1]
    A connector terminal (20) of a jet pump inlet mixer of a boiling water reactor, i. BWR, comprising:at least one flange (10) configured to mate with a lower portion (4a) of an inlet mixer (4) of a BWR jet pump set (8),the at least one flange having an arcuate shape following the sidewalls of the lower portion (4a) of the tubular inlet mixer (4) and configured to be substantially perpendicular to the sidewalls of the lower portion (4a) of the inlet mixer (4). projecting from the inlet mixer when the flange is installed on the inlet mixer of the jet pump set,wherein the at least one flange has a sidewall (10b) substantially parallel to the sidewalls of the lower portion (4a) of the inlet mixer (4) and configured to project toward a lowermost distal end (4b) of the inlet mixer when the flange is installed on the inlet mixer of the jet pump set.
    [2]
    2. A clamp according to claim 1, further comprising: at least one press stud hole (12) in each flange.
    [3]
    3. A clamp according to claim 2, further comprising:a press stud (14) penetrating through each press stud hole, the press stud being configured to press against an upper rim (2a) of a diffuser (2) when the flange is installed on the inlet mixer.
    [4]
    4. jet pump inlet mixer with a clamp according to claim 1,wherein the at least one flange is monolithically formed on the lower portion of the jet pump inlet mixer.
    [5]
    The jet pump inlet mixer of claim 4, wherein the at least one flange defines a gap (G) between the sidewall (10b) of the flange substantially parallel to the sidewalls of the lower portion (4a) of the jet pump inlet mixer (4) and a side wall of the jet pump inlet mixer.
    [6]
    The jet pump inlet mixer of claim 5, wherein the gap is sized to allow a lip of an upper rim of a diffuser to fit between the side wall of the flange and the side wall of the jet pump inlet mixer.
    [7]
    7. jet pump inlet mixer according to claim 4, wherein the clamp has at least two flanges.
    [8]
    8. jet pump inlet mixer according to claim 7, wherein:the gaps (P), which are arranged at least two flanges between the flanges and are located laterally to the relevant flange in the circumferential direction,wherein the laterally disposed gaps are sized to allow a guide tab of a diffuser to fit between the flanges and into the laterally disposed gaps.
    [9]
    A system comprising a connector terminal (20) of a jet pump inlet mixer of a boiling water reactor, i. BWR installed on a BWR jet pump set (8), the BWR jet pump set (8) comprising:a diffuser (2) having an upper rim (2a);the jet pump inlet mixer (4) having a lowermost distal end (4b) and a lower portion (4a), the lowermost distal end being inserted into the upper rim of the diffuser; andthe connector clip (20) comprising at least one flange (10) having an arcuate shape following the side walls of the lower portion (4a) of the tubular inlet mixer (4) and attached to the lower portion of the inlet mixer, the at least one flange protruding substantially perpendicularly from the side walls of the lower portion (4a) of the inlet mixer (4) from the inlet mixer, and comprising:a side wall (10b) substantially parallel to the side walls of the lower portion (4a) of the inlet mixer (4), projecting towards the lowermost distal end of the inlet mixer, a portion of an inner surface of the vertical side wall contacting the upper rim of the diffuser;at least one press stud (14) penetrating each flange, the press stud being configured to press against the upper rim of the diffuser.
    [10]
    A method of installing a plug-in terminal (20) of a jet pump inlet mixer of a boiling water reactor, i. BWR, on a BWR jet pump set (8), comprising:Attaching at least one flange (10) of the connector terminal (20) having an arcuate shape following the side walls of the lower portion (4a) of the tubular inlet mixer (4) to a lower portion (4a) of the inlet mixer (4) the at least one flange protrudes substantially parallel to the side walls of the lower portion (4a) of the inlet mixer (4) towards a lowermost distal end (4b) of the inlet mixer;Forming at least one hole (12) in each flange;Inserting a fastener (14) into each hole; andApplying a bias load to an upper rim (2a) of a diffuser (2) by tightening each fastener and causing the fastener to press against the upper rim.
    类似技术:
    公开号 | 公开日 | 专利标题
    CH704339B1|2016-08-31|Connector terminal of a jet pump inlet mixer system comprising such and method for installing such.
    DE823823C|1951-12-06|Gas turbine with guide vane attachment
    CH703569A2|2012-02-15|Jet pump for a boiling water reactor support system | -Strahlpumpenbaugruppe and method for generating a lateral holding force on the same.
    DE69936128T2|2008-01-17|Jet pumps auxiliary wedge
    DE112013004811T5|2015-08-27|Damper for a turbine rotor assembly
    DE102005030516A1|2007-01-04|Rotor for a turbine and method and apparatus for producing the rotor
    KR20100035338A|2010-04-05|Reinforcement device for lateral buckling stress on and engaging the same
    CH699710B1|2012-03-30|Pipe clamp.
    EP2846002A1|2015-03-11|Gas turbine
    DE102011054116A1|2012-04-12|brush seal
    DE19855311A1|1999-06-17|Clamping mechanism for repairing a nuclear reactor pressure vessel jet pump-riser system
    CH703554B1|2015-09-30|Inlet mixer holder for a Strahlpumpeneinspannaufbau a boiling water reactor |, and methods for attaching an inlet mixer holder.
    DE112014000678B4|2022-02-10|ENGINE CYLINDER MID STOP
    DE102017220793A1|2018-05-24|Intake device for a motor
    CH703552B1|2015-09-30|Inlet mixer clamp assembly for attachment to a transition piece of a jet pump assembly of a boiling water reactor |.
    CH703512A2|2012-01-31|Wedge clamp.
    EP3129600B1|2018-04-18|Wheel disc assembly
    CH704232B1|2015-04-15|Auxiliary wedge-positioning device for jet pump assemblies in nuclear reactors.
    CH689843A5|1999-12-15|Rueckhaltespannstange for a reactor jacket.
    DE10120532A1|2002-10-31|Device and method for fastening a rotor blade along a circumferential groove running within a rotor of an axially flowed through turbomachine
    EP2098687A1|2009-09-09|Rotor for a turbo engine
    DE102008048261B4|2017-04-06|Axial turbomachinery rotor with a paddle lock and method of making the same
    DE2633612C3|1981-09-24|Elastic buffer
    DE202018106311U1|2018-12-10|Clamping system for fixing railing panels and tools
    DE102005025836A1|2005-12-22|Method and apparatus for reducing vibrations in a component of a nuclear reactor
    同族专利:
    公开号 | 公开日
    US20120170703A1|2012-07-05|
    JP2012141309A|2012-07-26|
    TW201236024A|2012-09-01|
    US8599992B2|2013-12-03|
    ES2402159B1|2014-09-15|
    MX2012000102A|2012-06-29|
    ES2402159A2|2013-04-29|
    JP6118023B2|2017-04-19|
    CH704339A2|2012-07-13|
    ES2402159R1|2013-12-20|
    TWI497527B|2015-08-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4285770A|1979-07-12|1981-08-25|General Electric Company|Jet pump with labyrinth seal|
    FR2508225B1|1981-06-19|1983-10-07|Novatome|
    US6345084B1|1999-11-19|2002-02-05|General Electric Company|Apparatus and methods for replacing a core spray T-box/thermal sleeve in a nuclear reactor|
    US6394765B1|2000-10-18|2002-05-28|General Electric Company|Jet pump slip joint clamp apparatus|
    US6438192B1|2000-10-30|2002-08-20|General Electric Company|Jet pump slip joint seal|
    US6587535B1|2001-07-10|2003-07-01|General Electric Company|Jet pump slip joint labyrinth seal method|
    US7185798B2|2004-04-22|2007-03-06|Mpr Associates, Inc.|Apparatus and method for mechanically reinforcing the welds between riser pipes and riser braces in boiling water reactors|
    JP4799098B2|2005-09-20|2011-10-19|株式会社東芝|Jet pump|
    US20080029969A1|2006-08-02|2008-02-07|Torres Martin R|Jet pump slip joint piston ring seal|
    US20080031741A1|2006-08-02|2008-02-07|Torres Martin R|Jet pump slip joint with axial grooves|
    JP4580913B2|2006-08-17|2010-11-17|株式会社東芝|Jet pump riser reinforcement device|
    JP2008170272A|2007-01-11|2008-07-24|Hitachi-Ge Nuclear Energy Ltd|Jet pump|
    JP4546489B2|2007-01-15|2010-09-15|日立Ｇｅニュークリア・エナジー株式会社|Jet pump and reactor|
    JP5361500B2|2009-04-03|2013-12-04|株式会社東芝|Jet pump and vibration suppressing method thereof|US10190712B2|2012-10-01|2019-01-29|Westinghouse Electric Company Llc|Sliding duct connection|
    US9659676B2|2012-10-18|2017-05-23|Westinghouse Electric Company Llc|Jet pump diffuser stack repair|
    US10436227B2|2015-10-16|2019-10-08|Framatome Inc.|Sealing device for jet pump slip joints|
    US10458578B2|2015-12-02|2019-10-29|Ge-Hitachi Nuclear Energy Americas Llc|Method and apparatus for repairing a jet pump slip joint|
    US10753374B2|2016-05-09|2020-08-25|Ge-Hitachi Nuclear Energy Americas Llc|Slip joint clamps and methods for use in a nuclear reactor jet pump|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US12/982,035|US8599992B2|2010-12-30|2010-12-30|Method and apparatus for a jet pump inlet mixer integral slip joint clamp|
    [返回顶部]