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    • 专利摘要:
    The invention relates to a device for an elastic jet pump inlet mixer stop of a boiling water reactor (SWR) and an installation method for this device. The elastic inlet mixer stop may be mounted in a pocket region between a riser and an inlet mixer of a BWR jet pump assembly. The elastic inlet mixer stop comprises a main body (22) and a foot (24) which are separated by tightening one or more jacking screws (30) used to connect the main body (22) and the foot (24). A spring (22a) attached to the main body (22) provides a lateral force which is applied to the inlet mixer to push the inlet mixer away from a centerline of the riser. By adjusting a width of a gap between opposed bosses on a front surface of the main body (22) and a distal end of the spring (22a), a precise lateral force can be applied to the inlet mixer. The flexible inlet mixer stop applies a greater lateral force to the inlet mixer as the jack screws (30) are tightened, thereby further separating the main body (22) from the foot (24) while reducing the gap between the opposing bosses.
    公开号:CH704911B1
    申请号:CH00672/12
    申请日:2012-05-11
    公开日:2016-11-15
    发明作者:D Sprague Robin；J Lentner Bruce；Klein Emanuel；B Drendel David；E Nelson Bret
    申请人:Ge-Hitachi Nuclear Energy Americas Llc；
    IPC主号:
    专利说明:

    Background of the invention
    Field of the invention
    The present invention relates to an elastic inlet mixer stop for a jet pump of a boiling water reactor and a method for installing the inlet mixer stop.
    State of the art
    A reactor pressure vessel (RPV) of a boiling water reactor (BWR) usually has a generally cylindrical shape and is closed at both ends (e.g., by a lower head and a removable upper head). An upper guide is usually located at a distance above a core plate in the reactor pressure vessel. A core sheath or sheath usually surrounds the core and is supported by a sheath-mounting structure. More specifically, 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, a gap or annulus is provided.
    In a SWR, hollow tubular jet pumps located within the shell annulus provide the required water flow to the core of the reactor. The upper portion of the jet pump, known as an inlet mixer, is laterally disposed and is supported by a gravity-actuated wedge against two opposing rigid contacts in the jet pump retaining clips.
    Conventionally, adjusting screw gaps may be formed by movement of either the main wedge or the inlet mixer. In addition, vibrations can cause wear on the main wedge and / or setscrews. Set screw gaps allow the inlet mixer to experience flow-induced vibrations (FIV) that cause excessive wear on jet pump components. Further, in the conventional jet pump assembly, there may also be slip-joint leaks (i.e., leaks between the mechanical connection of the inlet mixer and the diffuser).
    Brief description of the invention
    The invention has for its object to reduce in a boiling water reactor (SWR) and inlet mixer of the type mentioned vibrations and wear on the main wedge and / or the set screws and / or the jet pump components. According to the invention, this is achieved by the features of the first and the further independent claims. Exemplary embodiments provide a method and apparatus for an elastic inlet mixer stop for BWR jet pumps that can apply a controlled, reduced side force to the side of the inlet mixer to stabilize the inlet mixer. The flexible inlet mixer stop, in conjunction with two other non-elastic stops, may provide three-point contact to mitigate inlet mixer induced vibration (FIV) and slip joint leakage. The three-point contact can be used in conjunction with an existing (i.e., conventional) main wedge and setscrews, or it can be used in place of an existing main wedge and set screws (i.e., an existing main wedge and / or existing set screws can be removed).
    Brief description of the drawings
    The above and other features and advantages of exemplary embodiments will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The accompanying drawings are intended to illustrate exemplary embodiments and are not to 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 to the contrary.<Tb> FIG. 1 <SEP> is a perspective view of a conventional boiling water nuclear reactor (BWR) jet pump assembly;<Tb> FIG. Fig. 2 is a magnified view of a conventional retaining clip assembly of a BWR jet pump;<Tb> FIG. FIG. 3 is an enlarged side view of a conventional retaining clip assembly of a BWR jet pump assembly; FIG.<Tb> FIG. FIG. 4 is a detail view of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention; FIG.<Tb> FIG. FIG. 4A is a rear elevational view of the flexible jet pump inlet mixer stop of FIG. 4 according to an exemplary embodiment of the invention; FIG.<Tb> FIG. 5 is a detail view of a flexible jet pump inlet mixer stop attached to a BWR retention clip assembly according to an exemplary embodiment of the invention;<Tb> FIG. 5A <SEP> is a plan view of the flexible jet pump inlet mixer stop mounted on a BWR retention clip assembly (shown in FIG. 5) according to an exemplary embodiment of the invention;<Tb> FIG. Fig. 6 is a detail view of a flexible jet pump inlet mixer stopper shown without clamps, according to an exemplary embodiment of the invention;<Tb> FIG. Fig. 6A <SEP> is an exploded view of the flexible jet pump inlet mixer stop of Fig. 6 according to an exemplary embodiment of the invention;<Tb> FIG. 7 is a detail view of a ratchet holder of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. 8 is a detail view of a main body of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. 9 <SEP> is a rear view of a pivotal contact pad of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. Figure 10 is a detail view of the pivotal contact pad (shown in Figure 9) of a flexible jet pump inlet mixer stop in accordance with an exemplary embodiment of the invention;<Tb> FIG. Figure 11 is a rear elevational view of a foot of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. 11A <SEP> is a detail view of the foot (shown in FIG. 11) of a flexible jet pump inlet mixer stop in accordance with an exemplary embodiment of the invention;<Tb> FIG. FIG. 12 is a detail view of a screw holder of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention; FIG.<Tb> FIG. Fig. 13 is a detail view of a jack screw of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. 14 is a detail view of a screw clamp of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention;<Tb> FIG. 14A <SEP> is a detail view of the screw clamp frame (shown in FIG. 14) of a flexible jet pump inlet mixer stop in accordance with an exemplary embodiment of the invention;<Tb> FIG. 14B <SEP> is a detail view of a screw-type ferrule (shown in FIG. 14) of a flexible jet pump inlet mixer stop according to an exemplary embodiment of the invention; and<Tb> FIG. FIG. 15 is a cutaway view of a flexible jet pump inlet mixer stop in accordance with an exemplary embodiment of the invention. FIG.
    Detailed description of the invention
    In this document, detailed exemplary embodiments are disclosed. However, specific constructional and functional details disclosed herein are merely representative of the purposes of describing example embodiments. However, exemplary embodiments may be embodied in many different forms and should not be construed as limited to only the embodiments set forth in this document.
    Accordingly, while exemplary embodiments may be subject to various changes and may be embodied in a variety of alternative forms, embodiments thereof will be exemplified in the drawings and described in detail in this document. It should be understood, however, that the intention is not to limit example embodiments to the precise forms disclosed, but exemplary embodiments are intended to encompass all modifications, equivalents and alternatives that fall within the scope of the exemplary embodiments. Throughout the description of the figures, like numerals designate like elements.
    It should be understood that although the terms first / first / first, second / second / second, etc. can be used in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element and, analogously, 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 any and all combinations of one or more of the associated listed items.
    It is understood that when an element is referred to as being "connected" or "coupled" to another element, it may be directly coupled or coupled to the other element, or intermediate elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intermediate elements. Other words used to describe the relationship between elements should be interpreted in the same way (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.).
    The terminology used in this document is for the purpose of describing specific embodiments only and is not intended to limit example embodiments. In this document, the singular forms of 'one', 'one', 'one' and 'the', 'the', 'the' are meant to include plural forms, unless the context clearly indicates otherwise. It is further understood that the terms "comprising," "comprising," "having," and / or "having" in this document indicate the presence of specified features, integers, steps, operations, elements, and / or components, but not the term Exclude presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.
    Fig. 1 is a perspective view of a conventional boiling water nuclear reactor (BWR) jet pump assembly. The jet pump arrangement comprises a large riser 1 between two inlet mixers 2. The inlet mixers 2 feed water into diffuser 4. A retaining clip assembly 6 may be used to restrict movement and vibration of the inlet mixer 2 in a conventional manner. The retaining clip assembly 6 may also be used to conventionally reduce slip-leaks that occur between the mating surfaces of the inlet mixer 2 and the diffusers 4.
    Fig. 2 is an enlarged view of a conventional BWR jet pump retaining clip assembly 6. The conventional retaining clip assembly 6 generally includes a retaining clip which surrounds the inlet mixer and urges against a sidewall of the riser pipe 1. The retaining clip provides three contact points for each inlet mixer 2 via a main wedge 8 and two setscrews 14 (see Fig. 5A, which shows the position of the two setscrews 14 for each inlet mixer 2). Guide ears 12 protrude perpendicularly from the retaining clip 10 at the position of each set screw 14.
    Fig. 3 is an enlarged side view of a conventional retaining clip assembly 6 of a BWR jet pump assembly. It should be noted that adjusting screws 14 contact a belly band 18 which surrounds the inlet mixer 2 (also shown in Fig. 5A). The profiled retaining clip wall 10a surrounds a side wall of the riser 1. Conventionally, there is a pocket 16 between the riser 1 and the inlet mixer 2 (more specifically, the pocket 16 is between the profiled wall 10a of the retaining clip 10 and the belly band 18).
    Fig. 4 is a detail view of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. The elastic stop 20 comprises a main body 22, which is bracketed by two Schraubzwingenrahmen 28. A foot 24 is provided to extend longitudinally across a second surface of the main body 22 (shown in greater detail in Figure 4A). The main body 22 has an arcuate spring construction 22 a fixed to the main body 22. The spring 22a, also called a cold spring, may be disposed toward a central portion of the main body 22 and projects beyond a first surface of the main body 22. Cold spring 22a may include a pivot contact pad 32 secured to a distal end of cold spring 22a. The pivotal contact pad 32 may be held by a shoulder screw 50 at the distal end of the cold spring 22a. At least one jacking screw 30 extends through the main body 22 and the foot 24 (shown in greater detail in FIGS. 6 and 15). Preferably, a push-off screw 30 can be arranged on each side of the cold spring 22a. Threads on the jack screws 30 mate with threaded connections in the main body and allow the jack screws 30 to be tightened to separate the foot 24 from the main body 22 (as will be described in more detail in this document). A ratchet holder 26 may be provided on an upper surface of the foot 24 (shown in greater detail in FIG. 6A).
    Screw clamps at both ends of the main body 22 may have an outer screw clamp frame 28 and an inner screw clamp body 34. The clamp body 34 may be retained in the clamp frame 28 via hex head cap screws 36 (described in more detail herein). It should be noted that an inclined surface 28a of the clamp frame 28 contacts an inclined surface 22b of the main body 22, providing for both vertical and horizontal stabilization of the main body 22 between the two screw clamps (as described in more detail herein). The angle of inclination may be a moderate angle from a horizontal plane (the horizontal plane may be the flat upper surface of the main body 22 or the foot 24), for example, an inclination of 17 degrees.
    FIG. 4A is a rear elevational view of the flexible jet pump inlet mixer stop 20 of FIG. 4 in accordance with an exemplary embodiment of the invention. FIG. Figure 4A shows the ratchet holder 26 extending along an upper surface of the foot 24 (the purpose of the ratchet holder 26 is described in this document). FIG. 4A also shows a shape of an inner surface 24a of foot 24 which may cause the foot 24 to slightly follow a shape of the profiled wall 10a of the retaining clip 10, as shown in FIG. An angled surface 24h may also be provided on the foot, which allows the inclined surface 28a of the clamp frame 28 to provide both vertical and horizontal stabilization for the foot 24 (analogous to the manner in which the inclined surface 28a of the clamp frame is applied) 28 is also engaged with the inclined surface 22b of the main body 22, as shown in Fig. 4). The sloping surface 24h of the foot 24 may be a moderate angle from a horizontal (similar to the description of Fig. 4), for example 17 degrees.
    Fig. 5 is a detail view of a flexible jet pump inlet mixer stop 20 mounted on a SWR retention clip assembly 6 according to an exemplary embodiment of the invention. The clamp frames 28 and the clamp shells 34 may be attached to the retaining clip 10 and retain the resilient stop 20 in the pocket 16 (see pocket 16 shown in FIG. 3). Forcing screws 30 can be used to adjust the force with which the cold spring 22a urges the belly band 18 of the inlet mixer 2. Once the desired force of the cold spring 22a has been achieved by tightening the jackscrews 30 (discussed more fully in this document, see in particular discussion with respect to Figure 15), the jackbolts 30 may be held in position over the ratchet holder 26. It will be appreciated that the general shape of the foot 24 generally conforms to the shape of the profiled wall 10a of the retention clip 10 to fit snugly within the pocket 16. *** "
    The flexible jet pump inlet mixer stop 20 may be mounted with two non-elastic stops 38 (the arrangement of the additional non-elastic stops 38 is best shown in Figure 5A) to provide three points of contact for the construction of the flexible jet pump inlet mixer stop 20. The resilient jet pump inlet mixer stop 20 may provide a reaction force (ie, a fixed point of contact against which the riser 2 may abut when the resilient stop 20 applies the lateral force to the riser 2) causing the inlet mixer 2 to disengage from the riser 1 displaced, thereby reducing the detrimental effect of set screw gaps (gaps between belly band 18 and set screws 14), which can cause chattering and damage. The lateral force which the resilient stopper 20 applies to the riser 2 may be in a direction opposite that which can be provided by an existing wedge 8. In other words, the lateral force provided by the elastic stop 20 may add to the hydraulic loads of the inlet mixer 2 already present on an inlet mixer with a conventional retaining clip assembly 6. However, since the lateral force applied by the resilient stop 20 may be in a direction opposite to the direction of the force generated by the wedge 8, undesirable movement of the inlet mixer 2 (e.g., flow-induced vibrations of the inlet mixer 2) and the components of the retaining clip assembly 6 (e.g., rattling of the gravity wedge 8 and / or set screws 14), thereby reducing potential damage to components. The adjustability of the stoppers 38, coupled with the lateral force of the resilient stop 20, can provide a well-regulated preload capable of preventing flow-induced slip joint vibrations (SJFIV), thus eliminating the need for slip-type clamps or other conventional constructions used be used to reduce unwanted component vibrations.
    Optionally, when the non-elastic stops 38 are used, the wedge 8 and / or the set screws 14 can be removed. Also, as an alternative to using two non-elastic stops 38, the resilient jet pump inlet mixer stop 20 may be used with the existing wedge 8 and set screws 14. The two non-elastic stops 38 may be adjustable hard stops (for example, ADJUSTABLE HARD STOPS FOR NUCLEAR REACTOR RESTRAINER BRACKETS AND METHODS OF USING THE SAME ("ADJUSTABLE HARD MOUNTINGS FOR CORE REFERENCE RETENTION BRACKETS AND METHOD OF USE THEREOF) disclosed in US patent application Ser 12/980 010, which is incorporated herein by reference in its entirety). The non-elastic stops 38 may provide a reaction force on both sides of the position of the wedge 8. The two non-elastic stops 38 can provide horizontal restraints between the retaining clip 10 and the inlet mixer 2 and thereby cause the resilient jet pump inlet mixer stop 20 and two non-elastic stops 38 to provide three points of contact that can substantially replace the three contact points conventionally provided by the wedge 8 and set screws 14. The two non-elastic stops 38 may also provide set screws or any other structure capable of pushing the retention clip 10 away from (or horizontally constraining) the inlet mixer 2 and three contact points comprising the flexible jet pump inlet mixer stop 20 as one of the contact points , be.
    Fig. 5A is a plan view of the flexible jet pump inlet mixer stop 20 mounted on a SWR retention clip assembly 6 (shown in Fig. 5) according to an exemplary embodiment of the invention. 5A shows the pivot contact pad 32 at a distal end of the cold spring 22a contacting the belly band 18 to apply a regulated lateral force to the inlet mixer 2 (ie, the cold spring 22a can direct the side force toward a centerline of the inlet mixer 2) and apply away from a centerline of the riser 1). FIG. 5A also shows the arrangement of non-elastic stops 38 that may be used to provide three-point contact (along with the flexible jet pump inlet mixer stopper 20) to stabilize the movement of the inlet mixer 2. The position of the pivotal contact pad 32 in contact with the inlet mixer 2 and the positions of non-elastic stops 38 in contact with the inlet mixer 2 may be spaced apart such that they are approximately 120 degrees apart at the inlet mixer.
    Fig. 6 is a detail view of a flexible jet pump inlet mixer stop 20, shown without clamps, according to an exemplary embodiment of the invention. It can be seen that there is a gap G (also shown in FIG. 15) between the main body 22 and the foot 24. This gap G makes it possible to finely adjust the lateral force applied to the inlet mixer 2 (via the cold spring 22a) by tightening jacking screws 30. More specifically, when forcing screws 30 are tightened, the gap G widens, causing the main body 22 to move away from the foot 24 and then causing the compression in the cold spring 22a to increase (when the pivotal contact pad 32 abuts) the inlet mixer 2 is pressed), whereby the inlet mixer 2 is subjected to a regulated side force.
    FIG. 6A is an exploded view of the flexible jet pump inlet mixer stop 20 of FIG. 6 according to an exemplary embodiment of the invention. FIG. Forcing screws 30 are free to rotate within the foot 24 with the distal ends of each jacking screw being held in place by a screw holder 42. Screw holders 42 may be secured to the foot 24 by flat head screws which may include a locking pin 44a (the locking pin 44a may be inserted to lock the position of the flat head screw 44 in a desired position). As described above, the tightening of jack-off screws 30 can cause the main body to be pushed away from the foot 24 (by use of threaded connections 22e in the main body 22), ultimately causing compression of the cold spring 22a which entrains the inlet mixer 2 the side force applied. Forcing screws 30 can be locked in place by means of ratchet holders 26. Specifically, ratchet teeth 46 (at each end of the ratchet holder 26) can engage ratchet teeth 30a (shown in Figure 13) of the jackscrews 30 and thus provide a rotationally secure construction to hold each jackoff screw in a desired position. A flat head screw 40 can be used to hold the ratchet holder 26 to the foot 24, and the locking pin 40a can be used to lock the flat head screw 40 in position once the screw 40 has been tightened sufficiently to ensure that the ratchet holder 26 in FIG his position at the foot 24 is held.
    Fig. 7 is a detail view of a ratchet holder 26 of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. A threaded hole 40b may be provided to allow the pan head screw 40 to hold the ratchet holder 26 against an upper surface of the foot 24. It will be appreciated that ratchet teeth 46 may be provided at both ends of the ratchet holder 26 for anti-rotation purposes (to ensure that a desired position of the jackbolts 30 within the foot 24 is maintained).
    Fig. 8 is a detail view of a main body 22 of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. On an outer surface of the distal end of the cold spring 22a, a spherical seat 22c may be provided. The spherical seat 22c may receive a convex spherical surface 32a (shown in FIG. 9) of the pivotal contact pad 32 for pivoting at a distal end of the cold spring 22a. The concave spherical seat 22c allows the pivotal contact pad 32 to adjust the positioning during attachment of the flexible jet pump inlet mixer stopper 20, including when the jackbolts 30 (shown in at least FIG. 6) are tightened and compressing the cold spring 22a (causing some displacement and movement of the distal end of the cold spring 22a, which may require a very accurate repositioning of the pivotal contact pad 32 during this adjustment / attachment period). Alignment channels 22d may also be provided to engage the self aligning rib 32b (shown in FIG. 9) of the pivoting contact pad 32 to reduce the actual rotation of the pivoting contact pad 32 during remote installation and use of the flexible jet pump inlet mixer stopper 20.
    Fig. 9 is a rear elevational view of a pivotal contact pad 32 of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. The shoulder screw hole 32c receives the shoulder screw 50 (shown at least in FIG. 6) to secure the pivot contact pad 32 to the cold spring 22a. As described with reference to FIG. 8 (top), the convex spherical surface 32a allows the pivot contact pad 32 to pivot within the concave spherical seat 22c of FIG. 8. Self-aligning ribs 32b align with alignment channels 22d (from FIG. 8) to cause the pivotal contact pad 32 to resist rotation during mounting and in use.
    Fig. 10 is a detail view of the pivotal contact pad 32 (shown in Fig. 9) of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. A lug pocket 32cl can receive and hold the head of the shoulder screw 50 (shown at least in FIG. 6). The concave cylindrical surface 32d may be provided to allow the pivot contact pad 32 to conform to an outer rounded surface of the belly band 18 of the inlet mixer 2.
    Figure 11 is a rear elevational view of a foot 24 of a flexible jet pump inlet mixer stop 20 according to an exemplary embodiment of the invention. A threaded hole 24b may be provided to receive the flat head screw 40 (shown in FIG. 6A). Ratchet tooth slots 24c may be provided to receive ratchet teeth 46 of the ratchet holder 26 (also shown at least in FIG. 6A). A check aperture 24d may be provided as a way of checking that the spherical pad 48 (shown in FIG. 15) is in the correct position within the jack screw retaining hole 24g (shown in FIG. 11A).
    Fig. 11A is a detail view of the foot 24 (shown in Fig. 11) of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. A pocket 24e may be provided to receive the screw holder 42 (shown in Figure 6A). Threaded holes 24f may be provided to receive flat head screws 44 (also shown in FIG. 6A). As described above, knock-out screw retention holes 24g may be provided in a front surface of the foot 24 (the surface of the foot facing the main body 22) to allow push-off screws 30 (shown in FIG. 6A) to freely within of the foot 24 (a screw holder 42, shown in Fig. 6A, may be provided simply to hold a distal end of each jack screw 30).
    Fig. 12 is a detail view of a screw holder 42 of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. Evident is the arcuate portion 42b of the screw holder 42 which surrounds the side of the jacking screw 30 (shown in FIG. 6A) and causes a distal end of the jack screw 30 to be retained within the jack screw retaining hole 24g (shown in FIG. 11A) , Holes 42a can receive flat head screws 44, as shown in Fig. 6A.
    Fig. 13 is a detail view of a jack screw 30 of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. Ratchet teeth 30a may be provided on the jacking screw 30 to allow the ratchet teeth 46 of the ratchet holder 26 to engage the teeth 30a for anti-rotation purposes (as shown in Figure 6A). It can be seen that the ratchet teeth 30a are larger than the diameter of the remainder of the jacking screw 30 and thereby provide a physical abutment which allows a distal end 30c of the jacking screw 30 within the jackknife screw retaining hole 24g (retaining hole 24g see FIG Foot 24 remains. Specifically, the arcuate portion 42b (see FIG. 12) of the screw holder 42 may provide a physical stop which may contact the enlarged diameter of the jack screw 30 (which has ratchet teeth 30a) to hold the jack screw 30 within the foot 24, such as in FIG Fig. 6A is shown. An external hex 30b may also be provided on the jack screw 30 to apply a required torque to the jack screw 30 to effectively compress the cold spring 22a (as described above with respect to the discussion of FIG. 6).
    Fig. 14 is a detail view of a screw clamp of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. A cavity 28b may be provided on the clamp frame 28 to allow the overhang 28c to extend over the upper end of the retaining clip 10 and to contact the main body 22. Concretely, the inclined surface 28a of the clamp frame 28 may contact the inclined surface 22b of the main body 22 (as shown in FIG. 4). The skew of the inclined surfaces 28a and 22b allows the clamp frames 28 (on both sides of the flexible jet pump inlet mixer stopper 20) to provide both vertical and horizontal stabilization of the main body 22 within the pocket 16 when installed on-site (see pocket 16 in FIG 3).
    The ferrule 34 can slide into and out of the ferrule frame 28 by using the dovetail spring portion 34a (which engages with the dovetail groove portion 28e in Fig. 14A) to enable the screw ferrule frame 28 and the ferrule 34 to engage the retaining clip 10 (see attached elastic jet pump inlet mixer stop in Fig. 5). An upwardly projecting portion 34c and an arcuate portion 34b of the screwcord body may be provided to allow the screwcord body 34 to resiliently receive a lower portion of the retention bracket 10 to securely secure both the screwcage frame 28 and the screwcord body 34 to the retention bracket , The hexagon head cap screw 36 can penetrate both the clamp frame 28 and the clamp body 34, and allows the position of the clamp body 34 to be locked within the frame 28. Ratchet teeth 36b on the cap screw 36 and a ratchet holder 36a may be used for anti-rotation purposes to lock the cap screw 36 once a desired position of the garment body 34 has been determined.
    Fig. 14A is a detail view of the screw clamp frame 28 (shown in Fig. 14) of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. A through hole 28d may be provided to receive the cap screw 36 (shown in FIG. 14). A dovetail groove 28e may be provided to engage a dovetail spring 34a of the clamp frame 28 (shown in FIG. 14), allowing the screw jack 34 to slide the screw clamp into and out of the clamp frame 28. The upper portion of the hole 28d may be threaded to receive the ratchet holder 36a.
    Fig. 14B is a detail view of a screw sheath body 34 (shown in Fig. 14) of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. The threaded hole 34d may be provided to receive the cap screw 36 (shown in FIG. 14). 14B shows in greater detail the dovetail spring 34a which is engageable with the dovetail groove 28e of FIG. 14A, allowing the gland body to slide into and out of the clamp frame 28, as shown in FIG.
    Fig. 15 is a cutaway view of a flexible jet pump inlet mixer stopper 20 according to an exemplary embodiment of the invention. This cutaway view shows a gap T between a protruding boss 22f (which is disposed on a first surface of the main body 22) and a protruding boss 22a1 (which is disposed on an inner surface of the distal end of the cold spring 22a). When attaching the resilient stop 30, the jacking screws 30 can be tightened to enlarge the gap G between the foot 24 and the main body 22 and to compress the cold spring 22a when the pivoting pad 32 contacts the inlet mixer 2 (as in FIG. 5A) is pressed. Thus, when the jack screws 30 are tightened, the gap T becomes smaller (as the gap G becomes larger). During the first attachment of the resilient stop 20 (at temperatures below the normal operating temperatures for jet pump assemblies), the gap T should be about zero or near zero (for example, the gap T could be 2.54 mm ((0.1 inch)) or larger be smaller). At zero or near zero gap T, the selection of the width and thickness of the cold spring 22a may ensure that the cold spring 22a provides a bias (ie, "spring load") which counteracts flow induced vibrations (FIV) occurring at the inlet mixer can. For example, the bias of the cold spring 22a may be in the range of 907.2 to 1814.4 kg (2000 to 4000 lbs). The actual bias of the spring 22a may be sized based on FIV loads, which may be plant specific. By choosing a wider spring 22a (with a higher relative spring rate), a higher bias (and higher side force during operation) can be applied by the spring 22a. By choosing a narrower spring (with a lower relative spring rate), a lower bias (and lower side force during operation) can be applied by spring 22a. Therefore, by choosing a cold spring 22a that provides a desired biasing force (and assuming that the gap T is zero or near zero during the first operation), then by the resilient stop 20, a precise lateral force on the inlet mixer 2 be applied.
    When the elastic stop 20 becomes warmer during normal plant operation (and during heating of the jet pump assembly, which occurs during normal plant operation), the thermal expansion of the resilient stop 20 can cause the gap T to increase slightly (a more extensive one) Discussion of the materials of components and the associated thermal expansion of these parts are included in this document). The presence of the small gap T (which may be 3/1000 inch in size) may allow the cold spring 22a to serve as a moderate shock absorber during heavy system vibration. The presence of a small gap T may also allow the protruding bosses 22f and 22a1 to shift slightly in a horizontal direction during system oscillations.
    The jack screw retaining holes 24g (also shown in Fig. 11A) may differ from the viewpoint that a retaining back hole 24g may have a spherical back stop 24g2, while another back hole 24g3 may be provided for another retaining hole 24g , The shape of the spherical back stop 24g2 corresponds to the shape of a distal end of the jacking screw 30 and allows the distal end of the jacking screw 30 to mate with the spherical back stop 24g2. The use of the spherical back stop 24g2 and the flat back stop 24g3 can reduce the possibility of seizure while torque is applied to the jack screws 30. Specifically, the spherical pad 48 can fit the flat back stop 24g3, with small gaps P on both lateral sides of the pad 48 (i.e., the diameter of the pad 48 is smaller than the diameter of the retaining hole 24g). The spherical surface of the pad 48 also corresponds to a distal end of the jacking screw 30 and allows the spherical pad 48 to mate with the distal end of the jacking screws 30. Since unequal torque can be applied to each jack screw 30, the distal end 30c of the right side jacking screw 30 of Figure 15 can be pivoted slightly within the jack screw retaining hole 24g, causing the spherical pad 48 to slightly push the flat back stop 24g3 of the retaining hole 24g (displacement of the pad 48 may occur due to the presence of gaps P on both sides of the pad 48). In this sense, a possible seizure due to a non-uniform torque between the two forcing screws 30 can be avoided. It should also be understood that the spherical detent 24g2 and the spherical pad 48 help to reduce or eliminate bowing of the bolts 30 during installation and operation.
    Fig. 15 also shows the placement of the screw holder 42 within the foot 24. The screw holder 42 serves as a physical stop (by abutting ratchet teeth 30a of forcing screws 30) to ensure that a distal end 30c of the jackscrews 30 within the retaining hole 24g can stay. As described above, the distal end 30c is free to rotate within retention holes 24g. Therefore, when the jack screws 30 are tightened, the distal end 30c of each jack screw 30 remains in position in retention holes 24g while the threads of each jack screw 30 cause the main body 22 to be pushed away from the foot 24 (thereby increasing the size of the gap G) and finally, the size of the gap T is decreased when the pivotal contact pad 32 is pressed against the inlet mixer 2, as shown in Fig. 5A).
    Materials of the components of the flexible jet pump inlet mixer stop 20 (with the exception of the cold spring 22a) and the non-elastic stops 38 may be either 300 series stainless steel or XM-19 type stainless steel. In particular, all components of the flexible jet pump inlet mixer stopper 20 (excluding the cold spring 22a) and the non-elastic stops 38 may correspond to the materials of the components of the existing retaining clip assemblies, such as the main wedge 8 and retaining clip 10 (which are often 300 series or XM-19). This provides that the potential thermal expansion of the flexible jet pump inlet mixer stop 20 and the non-elastic stops 38 correspond to some extent to the thermal expansion of the components of the existing retaining clip assemblies. However, materials for the cold spring 22a are preferably an X-750 type alloy or other suitable high performance, high temperature spring material that can expand less than either 300 series stainless steel or XM-19. The lower thermal expansion of the cold spring 22a causes a small gap T (see FIG. 15) between the bias limit humps 22a1 / 22f. The small gap T allows the spring 22a to function (move) during operation as described above.
    LIST OF REFERENCE NUMBERS
    [0041]<Tb> 1 <September> riser<Tb> 2 <September> inlet mixer<Tb> 4 <September> Diffuser<Tb> 6 <September> rear support bracket assembly<Tb> 8 <September> main wedge<Tb> 10 <September> retaining clip<tb> 10a <SEP> profiled wall of restraint bracket<Tb> 12 <September> Leadership ear<Tb> 14 <September> screw<Tb> 16 <September> Pocket<Tb> 18 <September> Belly Band<tb> 20 <SEP> Elastic jet pump inlet mixer stop<Tb> 22 <September> main body<tb> 22a <SEP> cold spring section<b> 22a1 <SEP> projecting hump of the distal end of the cold spring<tb> 22b <SEP> oblique surface<tb> 22c <SEP> concave spherical seat<tb> 22d <SEP> adjacent channels<Tb> 22e <September> threaded connections<tb> 22f <SEP> protruding hump of the main body<Tb> 24 <September> foot<tb> 24a <SEP> inner surface of the foot<Tb> 24b <September> threaded hole<Tb> 24c <September> ratchet tooth slot<Tb> 24d <September> Control opening<tb> 24e <SEP> bag (for screw holder)<Tb> 24f <September> threaded holes<Tb> 24g <September> jack screws retaining hole<tb> 24gl <SEP> enlarged section<tb> 24g2 <SEP> Spherical Backgauge<tb> 24g3 <SEP> flat backgauge<tb> 24h <SEP> inclined surface<Tb> 26 <September> ratchet holder<Tb> 28 <September> Schraubzwingenrahmen<tb> 28a <SEP> oblique surface<Tb> 28b <September> cavity<Tb> 28c <September> Overhang<Tb> 28d <September> Through Hole<Tb> 28e <September> dovetail<Tb> 30 <September> jackscrew<Tb> 30 <September> ratchet teeth<Tb> 30b <September> Hexagon<tb> 30c <SEP> distal end of jacking screw<Tb> 32 <September> swivel pads<tb> 32a <SEP> convex spherical surface<Tb> 32b <September> self alignment rib<Tb> 32c <September> Approach screw hole<Tb> 32cl <September> shoulder screws pocket<tb> 32d <SEP> Concave cylindrical surface<Tb> 34 <September> clamp<Tb> 34 <September> Swallowtail spring section<b> 34b <SEP> arcuate section of the screwcord body<tb> 34c <SEP> section above<Tb> 34d <September> threaded hole<Tb> 36 <September> Allen-head screw<Tb> 36 <September> coil spring ratchet holder<Tb> 36b <September> ratchet teeth<tb> 38 <SEP> non-elastic hard stops<Tb> 40 <September> Flachkopfschraube<Tb> 40 <September> locking pin<Tb> 40b <September> threaded hole<Tb> 42 <September> Screw Holder<Tb> 42 <September> threaded hole<b> 42b <b> arcuate section of the screw holder<Tb> 44 <September> Flachkopfschraube<Tb> 44 <September> locking pin<Tb> 46 <September> ratchet teeth<tb> 48 <SEP> Spherical Cushion<Tb> 50 <September> Ansatzschraube
    权利要求:
    Claims (10)
    [1]
    An elastic inlet mixer stop (20) for a jet pump of a boiling water reactor BWR, comprising:a main body (22) having a first surface and a second surface disposed on opposite sides of the main body (22);a foot (24) extending longitudinally along the second surface of the main body;a spring (22a) attached to the main body and projecting beyond the first surface of the main body; andat least one jacking screw (30) which connects the main body to the foot.
    [2]
    2. Elastic stop according to claim 1, whereinthe spring is disposed at a central portion with respect to the longitudinal direction of the main body,comprising at least one jacking screw, a first jacking screw and a second jacking screw, wherein the first and the second jacking screw are arranged on both sides of the spring.
    [3]
    3. An elastic stop according to claim 2, further comprising:a first and a second jack screw retaining hole (24g), each jack screw retaining hole being disposed in a front surface of the foot and configured to hold a distal end (30c) of a jack screw; anda first and a second threaded hole (22e) in the main body, wherein the first and second threaded holes engage threads of the first and second jackscrews, respectively, to cause the main body to separate from the foot when the jackbolts are tightened become.
    [4]
    4. An elastic stop according to claim 3, further comprising:a first protruding boss (22f) on the first surface of the main body; anda second protruding boss (22a1) on an inner surface of a distal end of the spring, the first and second protruding bosses being directly opposed to each other to define a gap (T) between the bosses.
    [5]
    5. An elastic stop according to claim 3, further comprising:a concave spherical seat (22c) on an outer surface of a distal end of the spring;a pivot contact pad (32) having a concave cylindrical outer surface (32d), the pivot contact pad having an inner convex spherical surface (32a) configured to mate with the concave spherical seat; andSelf-aligning ribs (32b) extending away from the inner convex spherical surface of the pivotal contact pad, the self-aligning ribs being inserted in alignment channels (22d) on the outer surface of the distal end of the spring.
    [6]
    6. An elastic stop according to claim 3, further comprising:a screw clamp on each of the two lateral sides of the foot (24) and the main body (22) so that the main body (22) is clamped by the screw clamps, each screw clamp comprising:a screw clamp frame (28) having a vertically downwardly projecting overhang (28c), the overhang having an inclined surface (28a) adapted to engage oblique surfaces on the two lateral sides of the foot (24h) and the main body (22b ) to matcha screw-type ferrule (34) having a vertically upwardly projecting portion (34c), the screw-ferrule body being configured to slide into and out of the screw-clamp frame;a cap screw (36) configured to lock the cup body in a desired position within the cup clamp frame.
    [7]
    A method of installing an elastic jet pump inlet mixer stop (20) of a boiling water reactor SWR according to any one of claims 1 to 6 on a BWR jet pump assembly (6), comprising:Providing the resilient inlet mixer stop within a pocket (16) defined by a retaining clip (10), an inlet mixer (2) and a riser (1) of the BWR jet pump assembly, andAttaching two stoppers (38) to the retention clip, the stoppers configured to urge the retention clip away from the inlet mixer.
    [8]
    8. The method of claim 7, further comprising:Holding a distal end (30c) of each jack screw in its corresponding retaining hole so as to allow the jack screw in the retaining hole to rotate freely;Applying a lateral force to the inlet mixer by tightening the at least one jacking screw, which causes the main body to separate from the foot and energize the spring, which applies the lateral force to the inlet mixer.
    [9]
    9. The method of claim 8, wherein applying the lateral force to the inlet mixer further comprises tightening the at least one jacking screw until a width of the gap (T) is 2.54 mm, i. 0.1 inch or less.
    [10]
    A boiling water reactor jet pump assembly having an elastic inlet mixer stop (20) according to any one of claims 1 to 6, comprising:a riser (1);an inlet mixer (2) adjacent to the riser;an elastic inlet mixer stop (20) mounted between the riser and the inlet mixer, the elastic stop comprisinga spring (22a) configured to apply a lateral force to the inlet mixer, the lateral force directed toward a centerline of the inlet mixer and away from a centerline of the riser.
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    同族专利:
    公开号 | 公开日
    US20120288053A1|2012-11-15|
    US10024338B2|2018-07-17|
    CH704911A2|2012-11-15|
    MX2012005549A|2012-11-22|
    MX350794B|2017-09-19|
    ES2426873B1|2014-09-09|
    CH704911A8|2015-11-13|
    JP5685559B2|2015-03-18|
    ES2426873R1|2013-12-20|
    JP2012237755A|2012-12-06|
    ES2426873A2|2013-10-25|
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    法律状态:
    2015-09-30| PK| Correction|Free format text: BERICHTIGUNG ERFINDER |
    2015-11-13| PK| Correction|Free format text: ERFINDER BERICHTIGT. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/106,420|US10024338B2|2011-05-12|2011-05-12|Method and apparatus for a BWR jet pump inlet mixer compliant stop|
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