公开(公告)号：US12191045B2

公开(公告)日：2025-01-07

申请号：US17746599

申请日：2022-05-17

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. Singh ,  Stephen J. Agace

IPC: G21F5/10 ,  G21F5/008 ,  G21F5/12

Abstract: A passively cooled stackable nuclear waste storage system may include a pair of vertically stacked radiation-shielded nuclear waste storage casks. Each cask has a cavity which holds a nuclear waste canister containing spent nuclear fuel or other high-level radioactive wastes. The lower cask may be founded on an above-grade concrete pad. The upper cask is vertically stacked on and detachably coupled to the lower cask. The upper cask comprises a perforated baseplate which establishes fluid communication between cavities of both casks and is configured to prevent radiation shine. One or both casks may include air inlet vents configured to draw ambient ventilation air into each respective cask cavity for cooling the nuclear waste. In operation, air is drawn inward into each cask cavity independently. Air heated in the lower cask rises into the upper cask where it mixes with air drawn into the upper cask and is returned to atmosphere.

公开(公告)号：US20200243209A1

公开(公告)日：2020-07-30

申请号：US16729654

申请日：2019-12-30

Applicant: Holtec International

Inventor： Stephen J. Agace ,  Stephen E. Thompson ,  John D. Griffiths ,  Richard M. Springman

IPC: G21F5/012 ,  G21C19/07 ,  G21C19/40

Abstract: A neutron absorbing apparatus, for insertion into a fuel cell storage system, includes a corner spine, a first wall and a second wall, each wall being affixed to the corner spine to form a chevron shape. Each wall includes an absorption sheet affixed to the corner spine, each absorption sheet being formed of a metal matrix composite having neutron absorbing particulate reinforcement, and a guide sheet affixed to and covering a fractional upper portion of the absorption sheet and extending over a top of the absorption sheet. The absorption sheet extends along the corner spine a greater length than the guide sheet.

公开(公告)号：US20180277273A1

公开(公告)日：2018-09-27

申请号：US16002325

申请日：2018-06-07

Applicant: Holtec International

Inventor： Krishna P. Singh ,  Stephen J. Agace

IPC: G21F5/012 ,  G21F5/12 ,  G21F5/00 ,  G21F5/10 ,  G21F5/008 ,  G21F5/005

CPC classification number: G21F5/012 ,  G21F5/00 ,  G21F5/005 ,  G21F5/008 ,  G21F5/10 ,  G21F5/12

Abstract: A canister apparatus, basket apparatus and combinations thereof for transporting and/or storing high level radioactive waste, such as spent nuclear fuel. In one embodiment, the invention can be a basket apparatus for supporting a plurality of spent nuclear fuel rods within a containment structure, the basket apparatus comprising a plurality of disk-like grates, each disk-like grate having a plurality of cells formed by a gridwork of beams; and means for supporting the disk-like grates in a spaced arrangement with respect to one another and so that the cells of the disk-like grates are aligned.

公开(公告)号：US20170236605A1

公开(公告)日：2017-08-17

申请号：US15584692

申请日：2017-05-02

Applicant: Holtec International

Inventor： Richard M. Springman ,  Stephen J. Agace ,  Krishna P. Singh

IPC: G21F5/008 ,  G21C19/06 ,  G21F9/34 ,  G21F5/12

CPC classification number: G21F5/008 ,  G21C19/06 ,  G21F5/06 ,  G21F5/12 ,  G21F5/14 ,  G21F9/34 ,  G21Y2002/104

Abstract: A fuel storage system for storing and drying nuclear fuel rods includes a vertically oriented capsule defining an internal cavity. A plurality of fuel rod storage tubes is disposed in the cavity. In one embodiment, each storage tube has a transverse cross section configured and dimensioned to hold no more than one fuel rod. Intact or damaged fuel rods may be stored in the storage tubes. After the fuel rods are loaded into the capsule, a lid is attached to a previously open top end of the capsule. In one embodiment, the lid may be sealed welded to the capsule for forming a gas tight enclosure. The interior of the capsule and multiple fuel rods contained therein may be dried together simultaneously via flow conduits formed in the lid that can be fluidly connected to a suitable drying process such as a forced gas dehydration system.

公开(公告)号：US09685248B2

公开(公告)日：2017-06-20

申请号：US13925585

申请日：2013-06-24

Applicant: Holtec International, Inc.

Inventor： Stephen J. Agace ,  Stephen E. Thompson ,  John D. Griffiths ,  Richard M. Springman

IPC: G21F5/012 ,  G21C19/07 ,  G21C19/40 ,  G21F1/06 ,  G21F1/08

CPC classification number: G21F5/012 ,  G21C19/07 ,  G21C19/40 ,  G21F1/06 ,  G21F1/08

Abstract: A neutron absorbing apparatus, for insertion into a fuel cell storage system, includes a corner spine, a first all and a second wall, each wall being affixed to the corner spine to form a chevron shape. Each wall includes an absorption sheet affixed to the corner spine, each absorption sheet being formed of a metal matrix composite having neutron absorbing particulate reinforcement, and a guide sheet affixed to and covering a fractional upper portion of the absorption sheet and extending over a top of the absorption sheet. The absorption sheet extends along the corner spine a greater length than the guide sheet.

公开(公告)号：US09640289B2

公开(公告)日：2017-05-02

申请号：US14912754

申请日：2015-04-24

Applicant: Holtec International

Inventor： Richard M. Springman ,  Stephen J. Agace ,  Krishna P. Singh

IPC: G21F5/008 ,  G21F5/12 ,  G21F5/06 ,  G21F9/34 ,  G21C19/06 ,  G21F5/14

CPC classification number: G21F5/008 ,  G21C19/06 ,  G21F5/06 ,  G21F5/12 ,  G21F5/14 ,  G21F9/34 ,  G21Y2002/104

Abstract: A fuel storage system for storing and drying nuclear fuel rods includes a vertically oriented capsule defining an internal cavity. A plurality of fuel rod storage tubes is disposed in the cavity. In one embodiment, each storage tube has a transverse cross section configured and dimensioned to hold no more than one fuel rod. Intact or damaged fuel rods may be stored in the storage tubes. After the fuel rods are loaded into the capsule, a lid is attached to a previously open top end of the capsule. In one embodiment, the lid may be sealed welded to the capsule for forming a gas tight enclosure. The interior of the capsule and multiple fuel rods contained therein may be dried together simultaneously via flow conduits formed in the lid that can be fluidly connected to a suitable drying process such as a forced gas dehydration system.

公开(公告)号：US20160314863A1

公开(公告)日：2016-10-27

申请号：US15137842

申请日：2016-04-25

Applicant: Holtec International

Inventor： Krishna P. Singh ,  Stephen J. Agace

IPC: G21F5/012 ,  G21F5/06

CPC classification number: G21F5/012 ,  G21C19/07 ,  G21C19/40 ,  G21F5/06

Abstract: A reactivity control device for storing nuclear fuel includes a top tube sheet, plurality of neutron absorber rods fixedly attached to the sheet, and a floating guide plate slideably mounted on the absorber rods for upward and downward movement between a lower position and an upper position. The reactivity control device is insertable into a spent fuel assembly in either wet storage in a spent fuel pool or dry storage in a canister. The absorber rods are inserted into empty guide tubes when the fuel assembly is removed from the nuclear fuel core normally occupied by control rods when in the reactor vessel. During installation, the device is lowered to insert the absorber rods into the guide tubes. The guide plate first engages the fuel assembly as the rods continue to slide through the plate until the tube sheet then engages the plate signaling the device is fully installed.

Abstract translation: 用于存储核燃料的反应性控制装置包括顶管板，固定地附接到片材的多个中子吸收棒和可滑动地安装在吸收棒上的浮动导板，用于在下位置和上位置之间上下移动。 反应性控制装置可以在乏燃料池中的湿存储中或在罐中的干燥储存中插入乏燃料组件中。 当燃料组件在反应堆容器中通常被控制棒占据的核燃料芯上移除时，将吸收棒插入空导管中。 在安装过程中，降低装置将吸收杆插入导管中。 引导板首先接合燃料组件，因为棒继续滑过板，直到管板接合板，指示装置完全安装。

公开(公告)号：US20160196887A1

公开(公告)日：2016-07-07

申请号：US15053608

申请日：2016-02-25

Applicant: Holtec International

Inventor： Krishna P. Singh ,  John D. Griffiths ,  Joseph Albert Meckley ,  Stephen J. Agace

IPC: G21F5/008 ,  G21F5/12 ,  G21F9/36 ,  G21F5/10

CPC classification number: G21F5/008 ,  G21F5/005 ,  G21F5/10 ,  G21F5/12 ,  G21F9/34 ,  G21F9/36

Abstract: A system for storing high level radioactive waste. In one embodiment, the invention can be a system including an overpack body extending along a vertical axis and having a cavity for storing high level radioactive waste, the cavity having an open top end and a floor; an overpack lid positioned atop the overpack body to enclose the open top end of the cavity; an air inlet vent for introducing cool air into the cavity, the air inlet vent extending from an opening in an outer surface of the overpack body to an opening in the floor, the opening in the outer surface of the overpack body extending about an entirety of a circumference of the outer surface of the overpack body; and an air outlet vent in the overpack lid for removing warmed air from the cavity.

Abstract translation: 一种用于储存高放射性废物的系统。 在一个实施例中，本发明可以是包括沿着垂直轴线延伸并具有用于存储高放射性废物的空腔的外包装主体的系统，该空腔具有敞开的顶端和底板; 位于外包装体顶部的外包装盖，以封闭空腔的敞开的顶端; 用于将冷空气引入空腔的进气口，所述进气口从所述外包装体的外表面中的开口延伸到所述地板中的开口，所述外包装体的外表面中的开口围绕整个 外包体的外表面的圆周; 以及在外包装盖中的空气出口通气口，用于从空腔移除温暖的空气。

公开(公告)号：US09208914B2

公开(公告)日：2015-12-08

申请号：US14674051

申请日：2015-03-31

Applicant: Holtec International, Inc.

Inventor： Krishna P. Singh ,  Stephen J. Agace ,  Stefan Anton

IPC: G21K1/00 ,  G21F5/10 ,  G21F5/002

CPC classification number: G21F5/10 ,  G21F5/002 ,  G21F5/06

Abstract: A system, method and apparatus for providing radiation shielding to a ventilated cask for holding high level radioactive materials. In one aspect, the tubular shell is positioned to circumferentially surround the cask so that an annular gap exists between the tubular shell and a sidewall of the cask. The tubular shell includes a first air flow inlet and a second air flow inlet. An air flow barrier is placed within the annular gap, separating the annular gap into a first chamber and a second chamber. A first air flow into the first air flow inlet passes through the first chamber and into the inlet vent of the cask, a second air flow into the second air flow inlet passes through the second chamber and to an opening at the top end of the tubular shell, and the air flow barrier prohibits cross-flow of air between the first and second chambers.

Abstract translation: 一种用于向用于保持高放射性物质的通风桶提供辐射屏蔽的系统，方法和装置。 在一个方面，管状壳体被定位成周向地围绕所述桶，使得在所述管状壳体与所述桶的侧壁之间存在环形间隙。 管状壳体包括第一空气流入口和第二空气流入口。 气流阻挡件被放置在环形间隙内，将环形间隙分离成第一腔室和第二腔室。 进入第一空气流入口的第一空气流通过第一室并进入桶的入口通道，进入第二空气流入口的第二空气流穿过第二室并且在管的顶端处的开口 壳体，并且空气流动屏障禁止第一和第二室之间的空气交叉流动。

公开(公告)号：US20240212873A1

公开(公告)日：2024-06-27

申请号：US18425329

申请日：2024-01-29

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  John D. Griffiths ,  Stephen J. Agace ,  Joseph A. Meckley

IPC: G21F5/008 ,  B23K9/00 ,  B23K101/12 ,  G21F5/005 ,  G21F5/10 ,  G21F5/12 ,  G21F9/34 ,  G21F9/36

CPC classification number: G21F5/008 ,  B23K9/0026 ,  G21F5/005 ,  G21F5/10 ,  G21F5/12 ,  G21F9/34 ,  G21F9/36 ,  B23K2101/12 ,  B23K2101/125

Abstract: A container system for radioactive waste and method for using the same is provided. The system includes a canister configured for holding radioactive waste and a lid system. In one embodiment, the lid system comprises a two-part lid assembly including a confinement lid and a shielded lifting lid. The confinement lid is detachably mounted to the confinement lid. In use, the lifting lid supports the confinement lid for lifting and placement on the canister. The lifting lid further shields operators while the confinement lid is mounted to the canister. Thereafter, the lifting lid is removed and may be reused for confinement lid mountings on other canisters. In one embodiment, the confinement lid is bolted to the canister. The canister may be disposed in a protective overpack for transport and storage.