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公开(公告)号：US4624826A
公开(公告)日：1986-11-25
申请号：US646761
申请日：1984-09-04
申请人： James E. Cearley , John C. Carruth , Robert C. Dixon , Stephanie S. Spencer , Jaime A. Zuloaga, Jr.
发明人： James E. Cearley , John C. Carruth , Robert C. Dixon , Stephanie S. Spencer , Jaime A. Zuloaga, Jr.
CPC分类号： G21C9/02 , G21C7/16 , G21Y2002/201 , G21Y2004/30 , G21Y2004/305 , Y02E30/39
摘要： A velocity limiting device providing greater resistance to motion through a fluid in one direction than in the opposite direction. The device includes a toroidally shaped control member having a smooth generally conical surface on one side for low resistance movement through the fluid in the one direction. On its opposite side the control member is formed with at least one groove providing a concave surface spaced from which is an arrangement of vanes forming a jet for directing a stream of fluid into the groove upon movement in the opposite direction whereby the resultant increase in fluid turbulence increases resistance to rapid movement in this opposite direction.
摘要翻译： 速度限制装置在一个方向上提供比在相反方向更大的阻力通过流体的阻力。 该装置包括环形控制构件，其在一侧具有平滑的大致圆锥形的表面，用于在一个方向上通过流体的低阻力运动。 在其相反侧，控制构件形成有至少一个凹槽，其提供间隔开的凹形表面，所述凹形表面是形成喷嘴的叶片布置，用于在相反方向上移动时将流体流引导到凹槽中，由此导致流体的增加 湍流增加了在相反方向快速运动的阻力。
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公开(公告)号：US4929412A
公开(公告)日：1990-05-29
申请号：US336941
申请日：1989-04-11
IPC分类号： G21C7/113
CPC分类号： G21C7/113 , G21Y2002/201 , G21Y2002/301 , G21Y2004/30 , Y02E30/39
摘要： An apparatus and process for control rod assembly and construction for a nuclear reactor is disclosed wherein the control rod is of cruciform configuration having a plurality of and preferably four flat planar members. Each planar member is made up with an assembly of square cross sectioned tubular members. Each square cross sectioned tubular member includes a defined cylindrical center and a constant thickness surrounding tubular metallic shell to provide the contained neutron absorbing materials in a cylindrically shaped pressure vessel. The constant thickness surrounding tubular shell constituting the cylindrical shaped pressure vessel has four corner sections added to generate a modified square exterior profile. These added four corner sections comprise an addition to the tubular side wall thickness of the shell. Appropriate chamfers and rounding are provided to the square profile to impart both stress relief and convenient points for automated welding between side-by-side square sections. The square cross sectioned tubular members when welded together extend axially and longitudinally the length of the control rod in the direction of control rod movement and fluid flow. The square cross sectioned tubular members are filled with a neutron absorbing material, plugged at both ends, and fastened by welding in side-by-side relation to form the planar control rod members of the required cruciform shape. These square cross sectioned tubular members as welded in side-by-side relation are in integral portion of the longitudinal support structure of the control rod and fasten and interconnect the handle at the top of the control rod and a conventional velocity limiting device at the bottom of the control rod. The fastening of the handles and velocity limiting device at the respective top and bottom provides a secondary and supplemental seal to primary plugs containing the neutron absorbing material. If needed for enhanced life, provision is made for the incorporation of a hafnium plate in a rectangular sectioned tube adjacent the handle at upper end of the control rod, this tip being variable in length dependent upon individual control rod requirements. Thus square sectioned tubular members form an improved poison containing cylindrical volume for providing resultant improved control rod worth and increased in service life time in moderating and shutting down nuclear reactions. Consequently, the disclosed construction can be used both for conventional control rods as well as for control rod configured for control cell locations.
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公开(公告)号：US4902470A
公开(公告)日：1990-02-20
申请号：US31633
申请日：1987-03-30
IPC分类号： G21C7/113
CPC分类号： G21C7/113 , G21Y2002/201 , G21Y2002/301 , G21Y2004/30 , Y02E30/39
摘要： An apparatus and process for control rod assembly and construction for a nuclear reactor is disclosed wherein the control rod is of cruciform configuration having a plurality of and preferably four flat planar members. Each planar member is made up with an assembly of square cross sectioned tubular members. Each square cross sectioned tubular member includes a defined cylindrical center and a constant thickness surrounding tubular metallic shell to provide the contained neutron absorbing materials in a cylindrically shaped pressure vessel. The constant thickness surrounding tubular shell constituting the cylindrical shaped pressure vessel has four corner sections added to generate a modified square exterior profile. These added four corner sections comprise an addition to the tubular side wall thickness of the shell. Appropriate chamfers and rounding are provided to the square profile to impart both stress relief and convenient points for automated welding between side-by-side square sections. The square cross sectioned tubular members when welded together extend axially and longitudinally the length of the control rod in the direction of control rod movement and fluid flow. The square cross sectioned tubular members are filled with a neutron absorbing material, plugged at both ends, and fastened by welding in side-by-side relation to form the planar control rod members of the required cruciform shape. These square cross sectioned tubular members as welded in side-by-side relation are an integral portion of the longitudinal support structure of the control rod and fasten and interconnect the handle at the top of the control rod and a conventional velocity limiting device at the bottom of the control rod. The fastening of the handles and velocity limiting device at the respective top and bottom provides a secondary and supplemental seal to primary plugs containing the neutron absorbing material. If needed for enhanced life, provision is made for the incorporation of a hafnium plate in a rectangular sectioned tube adjacent the handle at upper end of the control rod, this tip being variable in length dependent upon individual control rod requirements. Thus square sectioned tubular members form an improved poison containing cylindrical volume for providing resultant improved control rod worth and increased in service life time in moderating and shutting down nuclear reactions. Consequently, the disclosed construction can be used both for conventional control rods as well as for control rod configured for control cell locations.
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公开(公告)号：US4853176A
公开(公告)日：1989-08-01
申请号：US215188
申请日：1988-07-05
CPC分类号： G21C7/10 , G21Y2002/104 , G21Y2004/10 , G21Y2004/301 , G21Y2004/40 , Y02E30/39 , Y10S376/90
摘要： In a control rod construction for moderating and controlling a reaction of a nuclear reactor, a control rod structure is disclosed in which hafnium is welded to stainless steel. Typically, the control rod is confined for movement axially along its length into and out of the reactor. The hafnium is surrounded in the control rod structure by a sheath of stainless steel to inhibit movement relative to the control rod structure other than in the axial direction of control rod movement. The hafnium is friction welded to the stainless steel of the control rod so as to stress the weld in either tension or compression due to dynamic loading occurring from control rod movement. The stainless steel to which the hafnium is welded is in turn conventionally welded or mechanically connected to the remaining steel components of the control rod. There results a secure control rod structure having welded hafnium that can withstand the dynamic loadings of fast insertion of control rods such as those loadings which commonly occur under rapid control rod acceleration and deceleration due to SCRAM of a reactor.
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公开(公告)号：US5247549A
公开(公告)日：1993-09-21
申请号：US961771
申请日：1992-10-16
申请人： James E. Cearley , Yuen H. Kong
发明人： James E. Cearley , Yuen H. Kong
CPC分类号： G21C7/10 , G21Y2002/402 , G21Y2002/501 , G21Y2004/30 , G21Y2004/301 , Y02E30/39 , Y10S411/913
摘要： A spacer pad for a nuclear control rod includes first and second halves each including a head and a shank. The shanks are configured for joining together the pad first and second halves, and the shanks are independently locked together for preventing the disassembly thereof. In an exemplary embodiment, the first and second shanks are threadingly joined together, and then independently locked together using a complementary hook and ledge respectively supported by the pad halves which allows assembly together of the pad halves but prevents disassembly thereof.
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公开(公告)号：US5247545A
公开(公告)日：1993-09-21
申请号：US963297
申请日：1992-10-19
申请人： James E. Cearley , Yuen H. Kong
发明人： James E. Cearley , Yuen H. Kong
CPC分类号： G21C19/10 , G21C19/207 , Y10S83/917
摘要： An assembly for servicing a cruciform control blade includes a carriage having first and second crossarms each containing a generally U-shaped slot for receiving the top of the control blade. The first crossarm includes a clamping actuator to rigidly clamp the carriage to the blade top. The second crossarm includes a tool positionable adjacent to a roller aperture in a selected one of the four panels of the control blade. The tool is positioned on the second crossarm at a predetermined depth, and at a predetermined lateral span from the first crossarm so that upon mounting of the carriage on the blade top and actuation of the clamping actuator, the tool is vertically and laterally aligned with a center of the panel roller aperture. In one embodiment, the tool is effective to sever the roller from the panel aperture without damaging the panel, and in another embodiment the tool is effective for installing a replacement spacer pad in the aperture.
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公开(公告)号：US4882123A
公开(公告)日：1989-11-21
申请号：US162449
申请日：1988-03-01
CPC分类号： G21C7/113 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , Y02E30/39
摘要： A neutron absorbing control device for service in nuclear reactors utilizing fissionable fuel. The control device includes hafnium metal as the neutron absorbing material which is employed in a unique structure which maximizes the advantages of hafnium while minimizing its disadvantages as well as providing other benefits.
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公开(公告)号：US4676948A
公开(公告)日：1987-06-30
申请号：US764677
申请日：1985-08-12
申请人： James E. Cearley , Kenneth R. Izzo
发明人： James E. Cearley , Kenneth R. Izzo
CPC分类号： G21C7/113 , G21Y2002/103 , G21Y2002/201 , G21Y2004/10 , G21Y2004/30 , Y02E30/39
摘要： A control rod for a nuclear reactor wherein plates of neutron absorbing material (e.g. hafnium) are used in the upper portion thereof and tubes containing a different neutron absorbing material (e.g. boron) are positioned beneath the plates. To relieve the tubes of the weight of the plates, the plates are attached to support members of the control rod frame, to prevent or reduce the area of a gap between the plates and the tubes, joints therebetween are provided.
摘要翻译： 用于核反应堆的控制棒，其中在其上部使用中子吸收材料（例如铪）板，并且将含有不同中子吸收材料（例如硼）的管定位在板下方。 为了减轻板的重量，板被附接到控制杆框架的支撑构件上，以防止或减小板和管之间的间隙的面积，提供它们之间的接合。
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公开(公告)号：US4420458A
公开(公告)日：1983-12-13
申请号：US258639
申请日：1981-04-29
申请人： Thomas G. Dunlap , William G. Jameson, Jr. , Carl R. Mefford , Harold L. Nelson , James E. Cearley
发明人： Thomas G. Dunlap , William G. Jameson, Jr. , Carl R. Mefford , Harold L. Nelson , James E. Cearley
摘要： In a nuclear fuel assembly having a coolant conducting or water tube which also retains the spacers in axial position, the fuel rods experience greater axial growth with exposure than the water tube creating a risk that the water tube might become disengaged from the supporting tie plates. An arrangement for preventing such disengagement is described including lengthened end plug shanks for the water tube, a protective boss surrounding the lower end plug shank to protect it from flow induced vibration, a conical seat for the lower end plug and an arrangement for limiting upward movement of the water tube.
摘要翻译： 在具有还将间隔件保持在轴向位置的冷却剂导管或水管的核燃料组件中，与水管相比，燃料棒暴露于轴向增长，导致水管可能从支撑连接板脱离。 描述了一种用于防止这种脱开的装置，其包括用于水管的加长的端塞柄，围绕下端塞柄的保护凸起以防止流动引起的振动，用于下端塞的锥形座和用于限制向上运动的装置 的水管。
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公开(公告)号：US5243631A
公开(公告)日：1993-09-07
申请号：US932175
申请日：1992-08-19
IPC分类号： G21C19/02
CPC分类号： G21C19/02 , G21C19/207 , Y10T29/4973 , Y10T29/531
摘要： An apparatus and method are provided for servicing an irradiated nuclear control rod underwater in a reactor building servicing pool. A turntable containing a plurality of spaced apart tools is positioned adjacent to the control rod. A first tool aligns the turntable relative to the radioactive roller mounted to the control rod by a radioactive pin therethrough. The turntable is indexable to position a second tool adjacent to the radioactive roller and pin, with the second tool being effective for freeing the radioactive pin from the control rod. The turntable is indexable for positioning a third tool adjacent to the radioactive roller and pin for removing the radioactive pin and the roller from the control rod. In further embodiments of the invention the turntable is further indexable for positioning a fourth tool adjacent to the control rod for reaming the pin aperture through which the radioactive pin was mounted. The turntable further includes a fifth tool which is indexable into position adjacent to the control rod for inserting a replacement roller and replacement pin therein. The replacement pin is secured to the control rod by a sixth tool supported on the turntable which is also indexable into position.
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