MXPA99009677A - Union of box in shape of superior t of aspersion of the nucleo to recipient safety container nucl - Google Patents

Abstract

A T-shaped box assembly is disclosed to facilitate the attachment of a core spray line to a spray nozzle safety end of the seamless reactor core. In one embodiment, the T-shaped box assembly includes a T-shaped box housing, a cruciform key, and a sliding pin. The T-shaped housing housing is configured to be positioned so that a first end is positioned within a core spray nozzle and engages the safety end of the core spray nozzle. Two other ends are configured to be in substantial alignment and configured to be coupled to core sprayer line head tubes. The T-shaped housing housing also includes a cover opening configured to receive a T-shaped housing cover plate. The T-shaped housing cover plate includes a sliding pin opening configured to receive the sliding pin. The first end of the T-shaped box also includes a plurality of positioning lugs configured to collect the core sprinkling nozzle to center the T-shaped housing housing in the nozzle bore. The cruciform key includes four reinforcing members that extend from a central member and are configured to form an X-shaped configuration. Two support members extend between the ends of the adjacent reinforcing members and are configured to conform to the bore. of the safety end of the core spray nozzle. The sliding bolt is configured to extend through a hole in the cruciform key and the sliding bolt opening in the T-shaped housing cover plate and to screw a bolt nut in a threaded manner

Description

UNION OF BOX IN SHAPE OF SUPERIOR T OF ASPERSION OF THE NUCLEUS TO NUCLEAR REACTOR SAFETY CONTAINER BACKGROUND OF THE INVENTION This invention relates generally to nuclear reactors and more particularly to assemblies and methods for coupling core sprayer line assemblies in said reactors. A nuclear reactor pressure safety vessel (RPV) of a boiling water nuclear reactor (BWR) commonly has a generally cylindrical shape and is closed at both ends, ie, by a lower shell and shell. top that can be removed. A core coating, or coating, commonly surrounds the core and is supported by a coating support structure. Boiling water nuclear reactors have numerous pipe systems, and such pipe systems are used, for example, to transport water through the pressure safety container of the nuclear reactor. For example, the core spray pipe is used to deliver water from outside to the pressure safety container of the nuclear reactor to the core spray tubes inside the pressure vessel of the nuclear reactor and to cool the core. Commonly, the core spray pipe is coupled to a thermal handle that is welded to a nozzle of the pressure vessel of the nuclear reactor, or safety end. Tension corrosion cracking (SCC) is a known phenomenon that occurs in reactor components, such as structural members, pipes, fasteners, and welds, exposed to water at high temperatures. The components of the reactor are subjected to a variety of stresses associated with, for example, differences in thermal expansion, the operating pressure necessary for the cooling water containment of the reactor, and other sources such as residual welding stresses, Cold work and other heterogeneous metal treatments. Additionally, water chemistry, welding, radiation and heat treatment can increase the susceptibility of metal in a component to stress cracking. The internal piping of the reactor, such as thermal handles and core spray lines, occasionally require replacement as a result of stress cracking. The replacement of the core spray pipe generally requires removing the spray line from the core of the safety end of the pressure vessel of the nuclear reactor. As the spray line is welded to the safety end, removing the spray line from the safety end usually damages, or breaks the safety end. To replace the safety end, the reactor must be drained to an elevation below the safety end. Then the safety end is cut and a replacement is welded to the pressure safety container of the nuclear reactor. Subsequently, the replacement core spray line is welded to the replacement safety end. Replacing a security endpoint is time consuming and very laborious. It would be desirable to provide an assembly that facilitates the replacement of core spray lines without removing the safety end of the pressure vessel from the nuclear reactor.

It would also be desirable to provide such a set that is easily removed and installed without the need for welding. BRIEF DESCRIPTION OF THE INVENTION These and other objects can be achieved by a T-shaped box assembly that makes it easy to attach a core spray line to a safety end of the spray line of the seamless reactor core. In one embodiment, the T-shaped box assembly includes a T-shaped box housing, a cruciform key, and a sliding pin. The T-shaped box housing includes three ends, and is configured to be positioned so that the first end is positioned within a core spray nozzle and engages the safety end of the core spray nozzle. The other two ends are configured to be in substantial alignment with each other and to couple those of the head of the core spray line. The T-shaped housing housing also includes a cover opening that is in substantial alignment with the first end, and receives a T-shaped box cover plate. The T-shaped box cover plate includes an opening of sliding bolt to receive the sliding bolt. The first end of the T-shaped box also includes a plurality of positioning lugs configured to couple the core spray nozzle to center the T-shaped housing housing in the nozzle bore. The cruciform key includes a central member having a perforation extending therethrough. Four members of «Reinforcement extend from the central member. The reinforcing members are configured to form an X configuration. Two support members extend between the ends of the adjacent reinforcing members with a first support member extending between the first and second reinforcing members, and a second sensor of movement that extends between the third and fourth reinforcing members. The support members couple the piercing of the safety end of the core spray nozzle. The sliding pin extends through the bore of the central member of the cruciform key. The sliding bolt includes a cap portion positioned at one end configured to be larger than the diameter of the bore through the central member of the cruciform key. The opposite end of the sliding bolt extends through the sliding bolt aperture in the T-shaped housing cover plate and threadably couples a sliding bolt nut. The sliding bolt and cruciform key may have spherical coupling surfaces to prevent the sliding bolt from bending. The T-shaped box assembly is used to connect a core spray line to the safety end of a core spray nozzle by coupling the first end of the T-shaped housing housing to one end of the core end. safety and coupling the other two ends of the housing to tubes of the spraying head of the core. Particularly for coupling the first end of the T-shaped housing housing to the safety end, the cruciform key and the sliding bolt are inserted into the bore of the safety end. The cruciform key is configured with the reinforcements in an X-shaped configuration and only two support members connect the reinforcement members to allow the key to be inserted into the bore of the safety end. The key is inserted in an orientation that places the axis of the bore of the central member of the key perpendicular to the bore of the safety end of the nozzle. Then, the key is inclined to move the bore of the central member in coaxial alignment with the safety end bore with the support members engaging the inner surface of the bore of the safety end. Then, the sliding bolt is inserted through the bore of the central member of the key with the threaded end of the slip bolt extending away from the safety end and into the T-shaped housing housing. T shape is placed with the alignment lugs engaging the inner surface of the core spray nozzle and the first end of the housing engaging the end of the safety end. The T-shaped box cover plate is placed on the cover of the cover with the threaded end of the sliding pin extending through the sliding pin opening in the cover plate. Then, the bolt of the sliding bolt is screwed into the bolt and adjusted to a predetermined torque. The core spray head tubes are attached to the other two ends of the T-shaped housing housing to complete the installation. The above-described T-shaped box assembly facilitates replacement of the core spray line without removing the safety end of the core spray nozzle or draining the reactor. Additionally, the T-shaped box assembly facilitates joining the core spray line to the safety end without welding. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a top sectional view of a boiling water nuclear reactor pressure safety container illustrating a T-shaped box assembly in accordance with one embodiment of the present invention. Figure 2, is a sectional side view with cut away portions separated from the T-shaped box assembly shown in Figure 1. Figure 3 is a front view of the T-shaped box assembly shown in Figure 1. DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a top sectional view of a pressure safety container of the boiling water nuclear reactor 10. The pressure safety container of the nuclear reactor 10 includes a wall of the container 12 and a coating 14 surrounding the reactor core (not shown) of the pressure safety container of the nuclear reactor 10. A ring 16 is formed between the wall of the container 12 and the cover 14. The space between the ring 16 is limited to most of the reactor support pipe placed inside the ring 16. The cooling water is delivered to the reactor core during a loss of coolant accident through the pipes of the spray head of the core 18 and 20 which are connected to vertical down tubes 22 and 24, respectively. The vertical down tubes 22 and 24 are connected to the cover 14 through lower T-shaped boxes 26 and 28 respectively which are attached to the cover 14 and to internal sprinklers 30. The pipes of the distribution head 1 8 and 20 diverge of an upper T-shaped box assembly 32. Particularly, the T-shaped box 32 includes, in one embodiment, a T-shaped box housing 34 having first, second, and third ends 36 (shown in FIG. Figure 2) 38, and 40. The first end 36 of the T-shaped housing housing 34 is coupled to a safety end 42 of the sprayer nozzle of the core 44. The ends 38 and 40 are configured to be in substantial alignment. and configured to be coupled to the head tubes of the sprinkler line of the core 18 and 20 respectively. The head tubes 18 and 20 are coupled to the second and third ends 38 and 40 by tube connectors 46 and 48, respectively. The tube connectors 46 and 48 may be tube connectors of any type known in the art, but preferably, they are tube connectors such as those described in co-pending United States Patent Application Serial Number. 08 / 909,283, entitled CONJ UTO DE CON ECTOR DE TU BO, filed on August 1, 1997, and granted to the present assignee. Figure 2 is a sectional side view with parts cut away from the T-shaped box assembly 32. In one embodiment the T-shaped box assembly 32 includes in addition to the T-shaped box housing 34, a cruciform key 50 and a sliding bolt 52. The T-shaped housing housing 34 is configured to be positioned such that the first end 36 is positioned within the sprayer nozzle of the core 44 and engages the safety end of the nozzle. of spraying the core 42. Particularly the safety end 42 includes a first end 54, a second end 56, and a bore 58 extending between the ends 54 and 56. The bore 58 includes a tapered bore 60 located between the ends 54 and 56. The first end 36 of the T-shaped housing housing 34 engages the safety end of the sprinkler nozzle of the core 42 at the first end 54 forming a metal-to-metal interface 62. The T-shaped housing 34 also includes a cover opening 64 that is in substantial alignment with the first end 36, and is configured to receive a T-shaped box cover plate 66. The box cover plate in FIG. T-shape 66 includes a sliding pin opening 68 configured to receive the sliding bolt 52. The first end 36 of the T-shaped housing housing 34 also includes a plurality of positioning lugs 70 (one shown) configured to engage the core spray nozzle 44 for central the T-shaped housing housing 34 in the bore of the core spray nozzle 72. The sliding pin 52 is configured to extend through a bore 74 of a central member 76 of the cruciform key 50. The sliding bolt 52 comprises a cover portion 78 positioned on a first end 80 and configured to be larger than the diameter of the bore 74 through the central member 76 of the cruciform key 50. A second end of the sliding bolt 52 is configured to extend through the sliding bolt aperture 68 in the T-shaped box cover plate 66 and to threadably engage a sliding bolt nut 84.

Referring now to Figure 3, the cruciform key 50 includes a central member 76 having a bore 74 extending therethrough. The first, second, third and fourth reinforcing members 86, 88, 90, and 92 extend from the central member 76. The reinforcing members 86, 88, 90, and 92 are configured to form an X-shaped configuration. Support member 94 and 96 extend between the ends 98, 100, 102, and 104 of the adjacent reinforcing members 86, 88, 90, and 92. Particularly, the support member 94 extends between the first and second support members. reinforcement 86 and 88, and the support member 96 extends between the third and fourth reinforcing members 90 and 92. The support members 94 and 96 are configured to conform to the perforation 58 of the safety end of the spray nozzle of the core 42. Particularly, support members 94 and 96 are configured to engage the tapered portion 60 of the piercing of the safety end 58 (shown in Figure 2). Additionally, the reinforcing members 86, 88, 90, and 92 are configured to have a contour that minimizes flow resistance. To replace a core spray line in the pressure safety container of the nuclear reactor 10, the existing combination of T-shaped box / thermal handle is removed from the safety end of the spray nozzle of the core 42 by arc cutting of conventional underwater plasma and / or machined by electric discharge (EDM). Commonly, a small portion of the end 54 of the security end 42 is also removed. The first end 54 is prepared, usually by electric discharge machining to engage with the first end 36 of the T-shaped housing housing 34. Particularly, the first end 54 of the security end 42 is machined to form a metal-to-metal interface 62 with the first end 36 of the T-shaped housing housing 34. The T-shaped box assembly 32 is used to connect the sprinkler lines of the core 18 and 20 to the safety end 42 of the core spray nozzle. 44 coupling the first end 36 of the T-shaped housing housing 34 to the securing end 42 and coupling the ends 38 and 40 to the tubes of the sprayer distribution head of the core 18 and 20. Particularly, for coupling the first end 36 from the T-shaped housing housing 34 to the securing end 42, the cruciform key 50 and the sliding bolt 52 are inserted into the bore of the safety end 58. The cruciform key 50 is configured with reinforcements 86, 88, 90, and 92 in X-shaped configuration and only two support members 94 and 96 connect the reinforcing members 86, 88, 90, and 92 to allow the cruciform key 50 to be inserted into the piercing of the safety end 58. The cruciform key 50 is inserted in an orientation that places the axis of the bore 74 of the central member 76 of the cruciform key 50 perpendicular to the axis of the bore 58 of the safety end of the nozzle 42. Then, the cruciform key 50 is tilted to move the bore of the central member 74 in alignment coaxial with the bore of the security end 58 and the support members 94 and 96 in engagement with the tapered portion 60 of the security end bore 58 The sliding bolt 52 is then inserted through the bore 74 of the central member of the key 76 with the threaded end 82 of the sliding bolt 52 extending away from the end. 42 and towards the T-shaped housing 34. This can be achieved by joining a thin wire (not shown) to the threaded end 82 of the bolt 52 and threading the wire through the bore of the central member of the key. 74 before inserting the cruciform key 50 and the sliding bolt 52 into the safety end 42. After tilting the cruciform key 50 into its operating position, the wire can be pulled through the bore of the central member 74 which in turn pulls the threaded end 82 of the sliding bolt 52 through the bore of the key 74 and in position with the cover portion 78 of the bolt 52 coupling the central member 76 of the cruciform key 50. Then, the T-shaped housing housing 34 is positioned with the alignment lugs 70 engaging the inner surface of the sprinkler nozzle of the core 44 and the first end 36 of the housing 34 coupling the first end 54 of the securing end 42. Then, the T-shaped box cover plate 66 is placed over the opening of the cover 64 with the threaded end 82 of the sliding pin 52 extending through the bolt opening. slider 68 on the cover plate 66. Then, the thread of the sliding bolt 84 is screwed into the bolt 52 and adjusted to a predetermined torque. The core spray head tubes 18 and 20 are then coupled to the ends 38 and 40 of the T-shaped housing housing 34 to complete the installation. The above-described T-shaped box assembly 32 facilitates replacement of the core spray lines 18 and 20 without removing the safety end of the core spray nozzle 42 or draining the reactor 10. Additionally, the box assembly T-shaped 32 facilitates joining the sprinkler lines of the core 18 and 20 to the safety end 42 without welding. From the above description of various embodiments of the present invention, it is clear that the objects of the invention are achieved. Although the invention has been described and illustrated in detail, it should be clearly understood that it is provided by way of illustration and example only and should not be considered as a limitation. Accordingly, the spirit and scope of the invention should be limited only by the terms of the appended claims.

Claims (19)

1. CLAIMS 1. A T-shaped box assembly for attachment to a safety end of the spray nozzle of the core in a pressure safety container of the boiling water nuclear reactor, the safety end includes a first end and a second end and a perforation extending from the first end to the second end of the safety end, said T-shaped box assembly comprises: a T-shaped box housing configured to couple the first end of the safety end of the spray nozzle of the nucleus; a cruciform key configured to engage a surface of the piercing of the safety end of the core spray nozzle; and a sliding pin coupled to said cruciform key.
2. 2. An assembly according to claim 1 further comprising a T-shaped box cover plate configured to couple said T-shaped housing housing, such cover plate comprises a sliding bolt aperture configured to accept said bolt. slider for coupling said cruciform key to said T-shaped housing housing. An assembly according to claim 2, wherein said T-shaped housing housing comprises a first end, a second end, a third end, and a cover opening, the first and second ends mentioned are configured to be in substantial alignment and to be coupled to a first and second core spray head bo respectively, said third end is configured to be placed in a bore hole. the spray nozzle of the core and attach the first end of the safety end of the spray nozzle n of the core and such a cover opening is configured to be in substantial recess with said third end of said T-shaped housing housing for receiving said T-shaped box cover plate. according to claim 3, wherein said third end of such a T-shaped housing housing further comprises a plurality of positioning lugs configured to couple the core spray nozzle to center such a T-shaped housing housing. in the perforation of the bulb. 5. A assembly according to claim 1, wherein said cruciform key comprises: a central member having a perforation therethrough; a first, a second, a third, and a fourth reinforcing member extending from such a central member, said reinforcing members being configured to form an X-shaped configuration; a first support member extending between the first ends of such first and second reinforcing members; and a second support member extending between the first ends of such third and fourth reinforcing members, said first and second support members being configured to engage the piercing of the safety end. An assembly according to claim 5, wherein said sliding bolt is configured to extend through such a bore of said central member of said cruciform key, said sliding bolt comprising a first end and a second end, said first end it comprises a lid portion configured to be larger than the diameter of such a bore through said central member of said cruciform key, said second end being configured to extend through said sliding pin opening in said cover plate of said cover plate. T-shaped box and for threaded coupling a sliding bolt nut. 7. An assembly according to claim 6, wherein said reinforcing members of said cruciform key are configured to have a contour that minimizes resistance to flow. 8. A method for connecting a core spray nozzle to a safety end in a pressure boiler of the boiling water nuclear reactor using a T-shaped box assembly, the safety end of the core spray nozzle comprises a first end, a second end, and a bore extending from the first end to the second end, the T-shaped box assembly comprises a box housing of T, a cruciform key, a sliding pin, and a T-shaped box cover plate, said method comprising the steps of: coupling the core spray line to the T-shaped housing housing; attach the cruciform key to a surface of the safety end drilling; coupling the T-shaped housing housing to the safety end to form a fluid passage from the core spray line to the safety end. A method according to claim 8, wherein the T-shaped housing housing comprises a first end, a second end, a third end and a cover opening, the first and second ends are configured to be in alignment Substantially, the third end is configured to be positioned in a bore of the core spray nozzle and to couple the first end of the safety end of the core spray nozzle, and the cover opening is configured to be in substantial alignment with the third end of the T-shaped housing housing and to receive the T-shaped box cover plate, and coupling the core spray line to the T-shaped housing housing comprises the steps of coupling a first tube of spraying head of the core to the first end of the housing and coupling a second sprayer head tube of the core to the second end of the housing. A method according to claim 9, wherein the cruciform key comprises a central member having a perforation therethrough, a first, a second, a third and a fourth reinforcing member extending from the central member, the reinforcing members are configured to form an X-shaped configuration, a first support member extends between the first ends of the first and second reinforcing members, and a second support member extends between the first ends of the third and fourth members of reinforcement; the first and second support members are configured to engage the piercing of the safety end, and coupling the cruciform key to a surface of the piercing of the safety end comprises the steps of: inserting the cruciform key into the piercing of the safety end with the axis of the piercing of the central member perpendicular to the axis of the piercing of the safety end; tilting the cruciform key to move the piercing of the central member in coaxial alignment with the piercing of the safety end; moving the cruciform key to the first end of the safety end so that the first and second support members engage the surface of the piercing of the safety end. eleven . A method according to claim 10, wherein the sliding pin comprises a first end and a second end, the first end comprises a cover portion configured to be larger than the diameter of the bore of the central member of the cruciform key, the second end is configured to extend through a sliding pin opening in the T-shaped box cover plate and to threadably engage a sliding pin nut, and to couple the T-shaped housing housing to the first end comprises the steps of: inserting the third end of the T-shaped housing housing into the core spray nozzle and engaging the first end of the safety end; inserting the sliding bolt through the bore of the central member of the cruciform key and the opening of the sliding bolt into the T-shaped box cover plate so that the second end of the sliding bolt extends through the plate. cover; move the cover plate in engagement with the opening of the T-shaped box cover; and threadably coupling the second end of the sliding bolt with the nut of the sliding bolt. 12. A method according to claim 1, wherein the third end of the T-shaped housing housing comprises a plurality of positioning lugs configured to engage the core spray nozzle to center the housing housing in the form of T in the drilling of the core spray nozzle, and the step of inserting the third end of the T-shaped housing housing into the core spray nozzle and in engagement with the first end of the safety end comprises the step of inserting the third end of the T-shaped housing housing into the core spray nozzle so that the positioning lugs engage the core spray nozzles and the third end engages the first end of the safety end of the spray nozzle of the nucleus. 13. A core spray line assembly for a nuclear reactor pressure safety container in a nuclear reactor, such a core spray line assembly comprising: a safety tip of a core spray nozzle comprising a first end , a second end, and a perforation extending between said first and second ends; and a T-shaped box assembly configured to engage said safety end, said T-shaped box assembly comprises a T-shaped box housing configured to engage said first end of said nozzle safety end of said T-shaped box assembly. sprinkling of the core, a cruciform key configured to couple a surface of the aforesaid perforation of said safety end of the core spray nozzle, and a sliding pin coupled to said cruciform key. 14. A core spray line assembly according to claim 13, wherein said T-shaped box assembly additionally comprises a T-shaped box cover plate configured to be coupled to said box housing at T-shaped, such cover plate comprises a slip bolt opening configured to accept the said sliding bolt for coupling said cruciform key to said T-shaped housing housing. A sprayer line assembly of the core of conformity with claim 14, wherein such a T-shaped housing housing comprises a first end, a second end, a third end, and a cover opening, the first and second said ends being configured to be in substantial alignment and for coupling to a first and second core spray head tube respectively, said third end is configured to be placed in a drilling the core spray nozzle and coupling said first end of said core spray nozzle safety end and such a cover opening is configured to be in substantial alignment with said third end of said T-shaped case housing and to receive such a T-shaped box cover plate. 16. A core spraying line assembly according to claim 15., wherein said third end of said T-shaped housing housing additionally comprises a plurality of positioning lugs configured to couple said core spray nozzle to center such a T-shaped housing housing in said nozzle bore. 17. A core sprayer line assembly according to claim 13, wherein said cruciform key comprises: a central member having a perforation therethrough.; a first, a second, a third, and a fourth reinforcing member extending from such a central member, said reinforcing members being configured to form an X-shaped configuration; a first support member extends between the first ends of such first and second reinforcing members, and a second support member extends between the first ends of such third and fourth reinforcing members, said first and second support members they are configured to couple the said perforation of such safety end. 1 8. A core spray line assembly according to claim 17, wherein said sliding pin is configured to extend through said bore of said central member of said cruciform key, said sliding pin comprises a first end and a second end, said first end comprises a lid portion configured to be larger than the diameter of such piercing through said central member of the cruciform key, said second end being configured to extend through such a bolt opening sliding on said T-shaped box cover plate and for threadably coupling a sliding bolt nut. 19. A core sprayer line assembly according to claim 18 wherein said reinforcing members of said cruciform key are configured to have a contour that minimizes flow resistance. RESU MEN A T-shaped box assembly is disclosed to facilitate the attachment of a core spray line to a spray nozzle safety end of the seamless reactor core. In one embodiment, the T-shaped box assembly includes a T-shaped box housing, a cruciform key, and a sliding pin. The T-shaped housing housing is configured to be positioned so that a first end is positioned within a core spray nozzle and engages the safety end of the core spray nozzle. Two other ends are configured to be in substantial alignment and configured to be coupled to core sprayer line head tubes. The T-shaped housing housing also includes a cover opening configured to receive a T-shaped box cover plate. The T-shaped box cover plate includes a sliding pin opening configured to receive the sliding pin. . The first end of the T-shaped box also includes a plurality of positioning lugs configured to collect the core spray nozzle to center the T-shaped housing housing in the nozzle bore. The cruciform key includes four reinforcing members that extend from a central member and are configured to form an X-shaped configuration. Two support members extend between the ends of the adjacent reinforcing members and are configured to conform to the bore. of the safety end of the core spray nozzle. The sliding bolt is configured to extend through a puncture of the cruciform key and the sliding bolt opening in the T-shaped box cover plate and to threadably engage a sliding bolt nut.