• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    14 METHOD AND APPARATUS FOR A JET PUMP THREE POINT SLIP JOINT CLAMP ABSTRACT A method and apparatus for providing a Boiling Water Reactor (BWR) jet pump threepoint slip joint clamp (10) to mitigate sleep joint leakage flow induced Vibration of aBWR j et pump assembly (8). A collar (12a/12b), provided as one seamlesscomponent or in separate portions, is installed on the upper croWn (2a) of a diffuser(2). The collar includes a lower set of fasteners (14) and an upper set of fasteners (16)that contact the inlet mixer (4) and diffuser, respectively, to horizontally stabilize theinlet mixer in a fixed position inside of the diffuser, The upper fasteners may beanchored by bosses (18) that ensure a light-Weight design of the collar. An optionalcantilevered seal (including a cantilevered oVerhang (20) and a lip (22)) may mitigate leakage from the slip joint interface.
    公开号:SE536115C2
    申请号:SE1151216
    申请日:2011-12-19
    公开日:2013-05-14
    发明作者:Robin D Sprague；Bret E Nelson
    申请人:Ge Hitachi Nucl Energy America；
    IPC主号:
    专利说明:

    Field of the InventionExample embodiments relate generally to nuclear reactors, and more particularly to amethod and apparatus for a Boiling Water Reactor (BWR) j et pump three point slipjoint clamp used to prevent leakage and vibration while constraining an interface between the inlet mixer and diffiaser of a BWR jet pump assembly.
    Related Art A reactor pressure vessel (RPV) of a boiling water reactor (BWR) typically has agenerally cylindrical shape and is closed at both ends (for example by a bottom headand a removable top head). A top guide typically is spaced above a core plate withinthe RPV. A core shroud, or shroud, typically surrounds the core and is supported by ashroud support structure. Particularly, the shroud has a generally cylindrical shapeand surrounds both the core plate and the top guide. There is a space or annulus between the cylindrical reactor pressure vessel and the cylindrically shaped shroud.
    In a BWR, hollow tubular jet pumps positioned within the shroud annulus provide therequired reactor core water flow. The upper portion of the jet pump, known as theinlet mixer, is laterally positioned and may be supported by conventional j et pumprestrainer brackets. While conventional jet pump restrainer brackets may providesystem stiffness that mitigates vibration of system components, slip joint leakage flow induced vibration (SJ LFIV) may still occur between the inlet mixers and the diffusers.
    Slip joint leakage FIV causes high vibratory loads, which have been identified as a root cause of j et pump assembly vibration damage.
    Conventionally, many attempts have been made to reduce slip joint leakage FIV. Forinstance, auxiliary wedges at the set screws of restrainer brackets, labyrinth seals,restrainer bracket pad repair, slip joint clamps and replacement main wedges have allbeen used. While these conventional solutions have provided some additional systemstiffr1ess, none of the solutions mitigate leakage and vibration at the actual slip jointinterface without placing additional loads on the slip joint interface between the inletmixer and the diffuser. In particular, conventional slip joint clamp designs havemitigated vibration, though they have increased the overall load being placed on theslip joint interface.SUMMARY OF INVENTIONExample embodiments provide a method and an apparatus for a jet pump three pointslip joint clamp. Example embodiments provide a light weight collar with points ofcontact on both the inlet mixer and the diffuser to horizontally stabilize the inlet mixeras it is seated in the diffuser. The horizontal stabilization of the inlet mixer, and thediffuser, reduce the overall loads being placed on the slip joint interface. Optionally,the slip joint clamp may also include a seal to prevent leakage at the interface betweenthe inlet mixer and the diffuser.BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of example embodiments will becomemore apparent by describing in detail, example embodiments with reference to theattached drawings. The accompanying drawings are intended to depict example embodiments and should not be interpreted to limit the intended scope of the claims.
    The accompanying drawings are not to be considered as drawn to scale unless exp licitly noted.
    FIG. l is a perspective view of a conventional boiling water nuclear reactor (BWR)jet pump assembly; FIG. 2 is a detailed view of a conventional slip joint that exists between an inlet mixerand a diffuser of a BWR j et pump assembly; FIG. 3 is a cross-sectional view of a conventional slip joint that exists between aninlet mixer and a diffuser of a BWR j et pump assembly; FIG. 4 is a detailed view of a j et pump three point slip joint clamp, in accordance withan example embodiment; FIG. 5 is a detailed view of a first half of a j et pump three point slip joint clamp, inaccordance with an example embodiment; FIG. 6 is a detailed view of a second half of a j et pump three point slip joint clamp, inaccordance with an example embodiment; FIG. 7 is a perspective view of a j et pump three point slip joint clamp installed on aBWR j et pump assembly, in accordance with an example embodiment; and FIG. 8 is a close-up view of a j et pump three point slip joint clamp installed on a BWR j et pump assembly, in accordance with an example embodiment.
    DETAILED DESCRIPTIONDetailed example embodiments are disclosed herein. However, specific structural andfunctional details disclosed herein are merely representative for purposes ofdescribing example embodiments. Example embodiments may, however, beembodied in many altemate forms and should not be construed as limited to only the embodiments set forth herein.
    Accordingly, While example embodiments are capable of various modifications andalternative forms, embodiments thereof are shown by way of example in the drawingsand will herein be described in detail. It should be understood, however, that there isno intent to limit example embodiments to the particular forms disclosed, but to thecontrary, example embodiments are to cover all modifications, equivalents, andaltematives falling within the scope of example embodiments. Like numbers refer to like elements throughout the description of the figures.
    It will be understood that, although the terms first, second, etc. may be used herein todescribe various elements, these elements should not be limited by these terms. Theseterms are only used to distinguish one element from another. For example, a firstelement could be terrned a second element, and, similarly, a second element could beterrned a first element, without departing from the scope of example embodiments. Asused herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
    It will be understood that when an element is referred to as being "connected" or"coupled" to another element, it may be directly connected or coupled to the otherelement or intervening elements may be present. In contrast, when an element isreferred to as being "directly connected" or "directly coupled" to another element,there are no intervening elements present. Other words used to describe therelationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.).
    The terrninology used herein is for the purpose of describing particular embodimentsonly and is not intended to be limiting of example embodiments. As used herein, thesingular forrns "a", "an" and "the" are intended to include the plural forrns as well,unless the context clearly indicates otherwise. It will be further understood that theterrns "comprises", "comprising,", "includes" and/or "including", when used herein,specify the presence of stated features, integers, steps, operations, elements, and/orcomponents, but do not preclude 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 altemative implementations, the functions/ actsnoted may occur out of the order noted in the figures. For example, two figures shownin succession may in fact be executed substantially concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
    FIG. l is a perspective view of a conventional nuclear boiling water reactor (BWR)j et pump assembly 8. The major components of the j et pump assembly 8 include ariser pipe 3 and two inlet mixers 4 that insert into respective diffusers 2.Conventionally, jet pump restrainer brackets 6 are used to stabilize movement of theinlet mixers 4 and reduce movement (i.e., slip joint leakage Flow Induced Vibration,or FIV) of and leakage at the slip joint l that exists at the interface between the inlet mixers 4 and the diffusers 2.
    FIG. 2 is a detailed view of a conventional slip joint that exists between an inlet mixer4 and a diffuser 2 of a BWR j et pump assembly. It should be noted that the bottom portion 4a of the inlet mixer 4 inserts into the upper crown 2a of the diffuser 2 (which also includes guide ears 2b). The interface between the inlet mixer 4 and the diffuser 2 is referred to as a “slip joint” l.
    FIG. 3 is a cross-sectional view of a conventional slip joint l that exists between aninlet mixer 4 and a diffuser 2 of a BWR j et pump assembly. The lowest distal end 4bof inlet mixer 4 rests in the upper crown 2a of diffuser 2, to form slip joint l.Conventionally, inlet mixer FIV may occur in the slip joint l when tolerancesbetween the distal end 4b of the inlet mixer 4 and the upper crown 2a of diffuser 2 donot exactly match. Additionally, leakage may occur at the interface, as water mayleak between the lowest distal end 4b of the inlet mixer and the upper crown 2a of the diffuser and out of the slip joint l.
    FIG. 4 is a detailed view of a j et pump three point slip joint clamp l0, in accordancewith an example embodiment. The clamp l0 may include two semi-circular opposingcollars (l2a/l2b) j oined together by dovetail j oints 24. Altemative to two collarportions, one seamless collar may also be used. However, the use of one seamlesscollar requires the removal of the inlet mixer 4 from the diffuser 2 during installation.Additionally, a collar that is broken into more than two portions may also be used.Altemative to dovetail joints 24, other ways of attaching collar portions (l2a/l2b)may instead be implemented, such as the use of pins, bolts, bolted flanges, clamps, welding, etc.
    The collar portions (l2a/l2b) may have two sets of fasteners. A lower set of fastenersl4 (including one or more fasteners) located at a lower elevation of the collar l2a/l2b, and an upper set of fasteners l6 (including one or more fasteners) located at a higher elevation of the collar 12a/12b. Both sets of fasteners penetrate the collar12a/12b and are radially aligned with a center of the collar 12a/12b (i.e., they face acenter of the collar 12a/12b). The set of lower fasteners may engage the upper crown2a of the diffuser (shown in FIGS. 7-8) and the upper set of fasteners may engage thebottom portion 4a of the inlet mixer (also shown in FIGS. 7-8). The fasteners 14/16ensure that the inlet mixer and the diffuser are horizontally stabilized. Additionally,by using three lower fasteners 14 and three upper fasteners, the inlet mixer anddiffuser may be stabilized without placing any load on the slip joint interface (therebyavoiding loading of potentially wom surfaces). Fasteners 14/ 16 may horizontallystabilize and support the inlet mixer 4 in a fixed concentric (or, eccentric) positionwithin the upper crown 2a of the diffuser (i.e., the force of the collar and fasteners14/ 16 “lock in” the inlet mixer, in one horizontal position in the diffuser). It shouldbe noted that the final axial position of the inlet mixer 4 may be either concentric, oreccentric, in relation to the diffuser 2. An eccentric position of the inlet mixer 4within the diffuser 2 may be tolerated, as an eccentric position is not disadvantageous to the overall performance of the jet pump assembly.
    Fasteners 14/ 16 may be threaded, allowing the fasteners 14/ 16 to be screwed into thecollar 12a/12b and toward the center of the collar 12a/12b. Fasteners 14/ 16 may be j acking bolts. Fasteners 14/ 16 may also be set screws, springs, double acting wedges(driven with socket head cap screws with ratchet keepers), or other such fasteners thatmay penetrate the collar and provide a horizontal load by contacting the side of theinlet mixer 4 and diffuser 2. Once the fasteners are tightened to horizontally load theinlet mixer and diffuser (as shown in FIGS. 7-8), the force of the fasteners may energize the collars 12a/12b (similar to the stored energy existing in a cold spring), thereby offering a further stabilizing support of the slip joint interface. A11 fastenersmay include anti-rotational structure as well, which may include crimp collars or ratchet keepers.
    In FIG. 4, a set of three lower fasteners 14 and three upper fasteners 16 is provided.However, the total number of upper and lower fasteners (12a/12b) may be increasedor decreased. Each of the upper fasteners 16 may be located on a boss 18 thatvertically protrudes from a top portion of the collar 12a/12b. The bosses 18 ensurethat the upper fasteners 16 are at a higher elevation than the lower fasteners 14. thebosses 18 also provide the collar 12a/12b with a light-weight design, as the bosses 18 may be used in lieu of using a thicker collar.
    Offsets 28 may be included to provide a clearance for diffuser guide ears 2b.Optionally, collars 12a/12b may include a horizontally proj ecting cantileveredoverhang 20 that protrudes toward a center of collar 12a/12b. The overhang 20 mayinclude a vertically proj ecting lip 22 on a distal end of the overhang 20, the lip 22protruding in a downward direction. The overhang 20 and lip 22 may be sized toallow the lip 22 to fit into the actual slip joint interface itself (i.e., lip 22 may fit inbetween the bottom portion 4a of the inlet mixer and the upper crown 2a of thediffuser). The combination of overhang 20 and lip 22 provides a “cantilevered seal” that mitigates leakage between the inlet mixer 4 and the diffuser 2.
    Optionally, fingers 27 may also be provided in the cantilevered overhang 20. Thefingers 27 may be defined by circular holes 26 penetrating the overhang 20 at a location that is toward a midsection of the overhang 20 (i.e., the holes 26 may be located toward a center of the width of a top surface of the overhang 20), and narrowslits 29 running through the holes and clear through a distal end of the overhang 20(and, clear through lip 22, if lip 22 is optionally provided), as shown in FIG. 4. Thefingers 27 may provide stress relief to the collars l2a/l2b, which may be advantageous in the overall perforrnance of the clamp l0.
    FIG. 5 is a detailed view of a first half l2a of a jet pump three point slip joint clamp10, in accordance with an example embodiment. In this figure, the female portion (female slots) 24a of the dovetail joints 24 (shown in FIG. 4) can be seen.
    FIG. 6 is a detailed view of a second half 12b of a j et pump three point slip jointclamp l0, in accordance with an example embodiment. In this figure, the male portion 24b of the dovetail joints 24 (shown in FIG. 4) can be seen.
    FIG. 7 is a perspective view of a j et pump three point slip joint clamp l0 installed ona BWR j et pump assembly 8, in accordance with an example embodiment. Collarsl2a/ l2b may be installed on the upper crown 2a of the diffuser 2. Therefore, lowerfasteners l4 may engage the upper crown 2a to stabilize the clamp l0 on the diffuser2. Bosses 18 may vertically project from the top of the clamp l0, allowing upperfasteners 16 to engage the lower portion 4a of the inlet mixer 4. Notice that offset 28provides a clearance for guide ears 2b. Because this example embodiment includes acollar with two portions (l2a/ l2b), clamp l0 may be fashioned onto an existing jetpump assembly 8 without the need for removing the inlet mixer 4 from the diffuser 2,for easy installation. Dovetail j oints 24 provide a quick and effective means of j oining both collars (l2a/ l 2b).
    FIG. 8 is a close-up view of a jet pump three point slip joint clamp 10 installed on aBWR j et pump assembly 8, in accordance with an example embodiment. This close-up view provides a clearer view of the components shown in FIG. 7. In thisembodiment, the cantilevered seal (cantilevered overhang 20 and lip 22, shown inFIG. 4) are used to seal off the slip joint interface l itself, to mitigate leakage that may otherwise occur between the inlet mixer 4 and the diffuser 2.
    Materials of construction for clamp l2a/l2b may be austenitic stainless steel, XM-l9,X-750, or other equivalent material. The fasteners, altemate wedges, and anti-rotational components (such as ratchet keepers) may also be made from the aforementioned materials.
    Example embodiments having thus been described, it will be obvious that the samemay be varied in many ways. Such variations are not to be regarded as a departurefrom the intended spirit and scope of example embodiments, and all suchmodifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
    权利要求:
    Claims (10)
    [1] 1. A boiling Water reactor (BWR) j et pump assembly slip joint clanip (10), coniprising: a circular collar (12a/12b); at least one lower fastener (14) penetrating the collar at a lower eleVation andradially aligned with a center of the collar; and at least one upper fastener (16) penetrating the collar at an upper eleVation and radially aligned with the center of the collar.
    [2] 2. The clanip of claini 1, further con1prising:bosses (18) Vertically protruding from a top portion of the collar, each of the upper fasteners penetrating a boss.
    [3] 3. The clanip of clain1 2, wherein,the at least one lower fastener including three lower fasteners, and the at least one upper fastener including three upper fasteners.
    [4] 4. The clanip of claini 2, wherein the collar includes two senii-circular portions j oined together by dovetail j oints (24).
    [5] 5. The clanip of clain1 2, further con1prising:a horizontally proj ecting cantileVer oVerhang (20) attached to the collar, the cantileVer oVerhang protruding toward the center of the collar. 12
    [6] 6. The clamp of claim 5, further comprising:a Vertically proj ecting lip (22) on a distal end of the cantilever overhang, the lip protruding in a downward direction.
    [7] 7. A system including a boiling water reactor (BWR) jet pump assembly slipjoint clamp (10) installed on a BWR j et pump assembly (8), comprising:a diffuser (2) with an upper crown (2a);an inlet mixer (4) with a lowest distal end (4b) and a bottom portion (4a), thelowest distal end inserted into the upper crown of the diffuser; andthe slip joint clamp collar (12a/12b) encircling an interface between thediffuser and the inlet mixer, the slip joint clamp including,a circular collar (12a/12b),at least one lower fastener (14) penetrating the collar at a lowereleVation and radially aligned with a center of the collar, the at least one lowerfastener contacting the upper crown (2a) of the diffuser; andat least one upper fastener (16) penetrating the collar at an uppereleVation and radially aligned with the center of the collar, the at least one upper fastener contacting a bottom portion of the inlet mixer.
    [8] 8. A method of installing a boiling water reactor (BWR) jet pump assembly slipjoint clamp (10) on a BWR j et pump assembly (8), comprising: providing a circular collar (12a/12b) around an interface between a diffuser (2)and an inlet mixer (4) of the jet pump assembly; penetrating at least one lower fastener (14) through a lower eleVation of the collar; 13 placing a biasing force on an upper crown (2a) of the diffuser by tightening thelower fasteners and having the lower fasteners contact the upper crown; penetrating at least one upper fastener (16) through an upper elevation of thecollar, the lower and the upper fasteners radially aligned with a center of the collar;and placing a biasing force on a bottom portion (4a) of the inlet mixer bytightening the upper fasteners and having the upper fasteners contact the bottom portion.
    [9] 9. The method of claim 8, further comprising:providing vertically protruding bosses (18) on a top portion of the collar,the penetrating of the upper fasteners through the collar including penetrating the bosses with the upper fasteners.
    [10] 10. The method of claim 9, further comprising: forrning a horizontally proj ecting cantilever overhang (20) on the collar, thecantilever overhang protruding toward the center of the collar; forrning a vertically proj ecting lip (22) on a distal end of the cantileveroverhang, the lip protruding in a downward direction; and inserting the lip in the interface between a diffuser and an inlet mixer of the jet pump assembly.
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    法律状态:
    2020-07-28| NUG| Patent has lapsed|
    优先权:
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