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公开(公告)号：US20240212874A1
公开(公告)日：2024-06-27
申请号：US18419615
申请日：2024-01-23
Applicant: Holtec International
Inventor： Krishna P. SINGH , Stephen J. AGACE
Abstract: A passively cooled stackable nuclear waste storage system includes an at least partially below grade cavity enclosure container (CEC) and above grade cask. Each vessel includes a cavity holding a nuclear waste canister containing spent nuclear fuel or other high-level radioactive wastes. The CEC is founded on a below grade concrete base pad and cask is mounted on an above-grade concrete top pad in a vertically stacked arrangement. 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 vessels include air inlets which draw ambient cooling air into their respective cavities for cooling the nuclear waste. Air heated in the lower CEC rises into the upper cask through the baseplate where it mixes with air drawn into the cask and is returned to atmosphere. The system increases storage capacity of new or existing facilities.
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公开(公告)号：US20240029906A1
公开(公告)日：2024-01-25
申请号：US18451885
申请日：2023-08-18
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH
IPC: G21F5/12
CPC classification number: G21F5/12
Abstract: A nuclear waste cask in one embodiment includes an axially elongated cask body defining a longitudinally-extending opening forming an entrance to an internal storage cavity of the cask configured for holding radioactive nuclear waste materials. A closure lid detachably coupled to the cask body at the top opening seals the cavity. A cask locking mechanism includes a plurality of first locking protrusions spaced apart on the lid which are selectively interlockable with a plurality of second locking protrusions spaced apart on the cask body to lock the lid to the cask body. The first locking protrusions may be disposed on slideable locking bars moveable between locked and unlocked positions while the lid remains stationary on the cask body. Hydraulic or pneumatic actuators may be used to change position of the locking bars. The cask and lid may include other features such as impact absorbers and lifting elements.
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公开(公告)号：US20230117993A1
公开(公告)日：2023-04-20
申请号：US18085428
申请日：2022-12-20
Applicant: Holtec International
Inventor： Krishna P. SINGH , Evan ROSENBAUM , Thomas G. HAYNES, III , John D. GRIFFITHS , Debabrata MITRA-MAJUMDAR , Indresh RAMPALL , Joseph Gerald Leo RAJKUMAR
Abstract: A neutron absorbing insert for use in a fuel rack. In one aspect, the insert includes: a plate structure having a first wall and a second wall that is non-coplanar to the first wall; the first and second walls being formed by a single panel of a metal matrix composite having neutron absorbing particulate reinforcement that is bent into the non-coplanar arrangement along a crease; and a plurality of spaced-apart holes formed into the single panel along the crease prior to bending.
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公开(公告)号：US20220351872A1
公开(公告)日：2022-11-03
申请号：US17850213
申请日：2022-06-27
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH , John D. GRIFFITHS , Stephen J. AGACE , Joseph A. MECKLEY
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.
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公开(公告)号：US20220165444A1
公开(公告)日：2022-05-26
申请号：US17527476
申请日：2021-11-16
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH
Abstract: An underground passively ventilated nuclear waste storage system includes an array of cavity enclosure containers each including a cavity holding a nuclear waste canister containing radioactive waste generating heat. Each container comprises at least one pair of air inlets each fluidly coupled directly to separate vertical cooling air feeder shells spaced apart from the container. The feeder shell in fluid communication with ambient air operates to draw in ventilation air which flows to the container via natural convective thermo-siphon effect driven by heat emitted from the canister which heats the container cavity. The containers are arranged in a serial spaced apart manner in multiple parallel rows. The containers within each row are fluidly isolated from containers in other rows. Containers within each row are further fluidly isolated from other containers therein when the ventilation system operates. The containers may be part of a consolidated interim storage facility for radioactive waste.
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Patent Agency Ranking
公开(公告)号：US20220130564A1
公开(公告)日：2022-04-28
申请号：US17568922
申请日：2022-01-05
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH
Abstract: A spent nuclear fuel storage facility. In one embodiment, the invention is directed to a storage facility including an array of storage containers. Each of the storage containers includes a body portion and a lid. The body portion has a storage cavity configured to hold a canister containing spent nuclear fuel. The lid, which may rest atop the body portion in a detachable manner, includes an inlet vent and an outlet vent. Each of the storage containers may be configured to draw air through the inlet vent and into the storage cavity where the air is warmed and passed through the outlet vent as heated air. The body portion of the storage containers may be positioned below grade and the lid of the storage containers may be positioned above grade.
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公开(公告)号：US20210407697A1
公开(公告)日：2021-12-30
申请号：US17357068
申请日：2021-06-24
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH , Frederick R. BIDRAWN
Abstract: A natural passively cooled ventilated cask includes a cavity which holds a canister containing heat and radiation emitting spent nuclear fuel assemblies. Cooling air inlet ducts draw ambient cooling air inwards into a lower portion of the cavity. The air heated by the canister flows upwards along the canister and is discharged from at least one air outlet duct formed by the cask lid to atmosphere via natural convective thermo-siphon flow. The air inlet ducts or at least one outlet duct in one embodiment may be fitted with an adjustable shutter plate which allows the flowrate of air entering the cask to be increased or decreased to maintain a predetermined canister maximum temperature limit selected in part to prevent the onset of stress corrosion cracking of the canister welds. Other embodiments may use a fixed orifice plate replaceable over time to maintain the minimum temperature.
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公开(公告)号：US20210278134A1
公开(公告)日：2021-09-09
申请号：US17193536
申请日：2021-03-05
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. SINGH , Akhilesh Vidyutkumar BAPAT , Vytautas Vincas MACIUNAS , Raghavendra PALLE
IPC: F28B1/06
Abstract: An induced draft air-cooled condenser for steam condensing applications includes a pair of inclined tube bundles defining a interior space therebetween in fluid communication with ambient air heated as it flows through the tube bundles. A fan supported above the interior space comprises rotatable fan blades disposed inside a cylindrical annular fan shroud. A drive mechanism operable to rotate the fan blades includes a motor operably coupled to the fan blades. The motor is supported inside the fan shroud and may be housed in a protective enclosure which may be insulated. A motor cooling system includes an air inlet duct fluidly coupled to ambient air outside the shroud and the enclosure. When the fan operates, cool ambient air is drawn via a vacuum formed by the fan through the duct to cool the motor. The air thus bypasses and is not heated by the tube bundles.
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9.发明申请公开(公告)号：US20190326028A1
公开(公告)日：2019-10-24
申请号：US16436548
申请日：2019-06-10
Applicant: Holtec International
Inventor： Krishna P. SINGH
Abstract: A system for storing and/or transporting high level radioactive waste, and a method of manufacturing the same. In one aspect, the invention is a ventilated vertical overpack (“VVO”) having specially designed inlet ducts that refract radiation back into the storage cavity. A clear line-of-sight does not exist through the inlet ducts and, thus, the canister can be supported on the floor of the VVO. Also disclosed is a method of manufacturing a variable height VVO that falls within a regulatory license previously obtained for a shorter and taller version of the VVO.
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10.发明申请NEUTRON SHIELDING RING, APPARATUS AND METHOD USING THE SAME FOR STORING HIGH LEVEL RADIOACTIVE WASTE 有权中性屏蔽环，装置和使用该方法存储高水平放射性废物的方法公开(公告)号：US20150287489A1
公开(公告)日：2015-10-08
申请号：US14264843
申请日：2014-04-29
Applicant: Holtec International, Inc.
Inventor： Stephen J. AGACE , Krishna P. SINGH
IPC: G21F5/008
CPC classification number: G21F5/008 , G21F5/005 , G21Y2002/201 , G21Y2002/304 , G21Y2004/30
Abstract: An apparatus, system and method for storing high level radioactive waste. In one aspect, the invention is a specially designed ring structure for providing neutron and gamma radiation shielding for high level radioactive materials that produce residual heat. A plurality of the ring structures may be arranged in a stacked assembly that completely surrounds an internal containment boundary. Collars may be provided at the ring-to-ring interfaces. The ring structures may have voids which are configured for receiving neutron absorbing material that completely surrounds the containment boundary.
Abstract translation: 一种用于储存高放射性废物的设备，系统和方法。 一方面，本发明是专门设计的环形结构，用于为产生残余热量的高放射性物质提供中子和γ辐射屏蔽。 多个环形结构可以布置成完全包围内部容纳边界的堆叠组件。 环到环的接口可以提供环。 环结构可以具有构造成用于接收完全包围容纳边界的中子吸收材料的空隙。
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