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公开(公告)号：US20200027606A1
公开(公告)日：2020-01-23
申请号：US16401891
申请日：2019-05-02
Applicant: HOLTEC INTERNATIONAL
Inventor： Richard M. Springman , Stephen J. Agace , Krishna P. Singh
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.
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公开(公告)号：US10535440B2
公开(公告)日：2020-01-14
申请号：US15596444
申请日：2017-05-16
Applicant: Holtec International
Inventor： Stephen J. Agace , Stephen E. Thompson , John D. Griffiths , Richard M. Springman
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.
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公开(公告)号：US10217537B2
公开(公告)日：2019-02-26
申请号：US15370877
申请日：2016-12-06
Applicant: Holtec International
Inventor： Stephen J. Agace
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：US12112856B2
公开(公告)日：2024-10-08
申请号：US17973895
申请日：2022-10-26
Applicant: Holtec International
Inventor： Krishna P. Singh , Stephen J. Agace
Abstract: A fuel rack for storing nuclear fuel in a fuel pool in one embodiment comprises a baseplate configured for placement in a fuel pool, and a cellular body coupled to the baseplate. The body comprises tightly-packed upwardly open cells which each hold a nuclear fuel assembly. In one embodiment, each cell may have a hexagonal cross-sectional configuration. The cells are each formed by angled cell walls and corners formed between adjoining cell walls. Adjacent cells are arranged to meet in corner-to-corner alignment. This produces triangular-shaped flux traps interspersed between the cells for reactivity control. In some embodiments, at least one peripheral side of the fuel rack has an undulating configuration defining a series of alternating peaks and valleys which nests with a complementary configured peripheral side of an adjacent fuel rack. This provides higher packing density of fuel racks and fuel assemblies in the fuel pool.
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公开(公告)号：US11887744B2
公开(公告)日：2024-01-30
申请号：US17850213
申请日：2022-06-27
Applicant: HOLTEC INTERNATIONAL
Inventor： Stephen J. Agace
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.
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Patent Agency Ranking
公开(公告)号：US11735327B2
公开(公告)日：2023-08-22
申请号：US17470053
申请日：2021-09-09
Applicant: HOLTEC INTERNATIONAL
Inventor： Krishna P. Singh , Stephen J. Agace , Robert Mahorter
Abstract: A natural passively cooled ventilated cask includes a cavity which holds a canister containing heat and radiation emitting spent nuclear fuel assemblies or other high level wastes. Ambient ventilation or cooling air is drawn inwards beneath the cask and vertically upwards into a lower portion of the cavity through air inlet ducts formed integrally with a bottom canister support structure coupled to the cask. The air heated by the canister flows upwards in the cavity and returns to atmosphere through air outlet ducts in the cask lid. Air circulation is driven via natural convective thermo-siphon flow. Structural standoff members elevate the bottom of the cask above a concrete base pad forming an air inlet plenum beneath the canister support structure. The lateral sidewall surface of the cask has no penetrations for the air inlets, which eliminates any streaming path for radiation emanating from the spent nuclear fuel.
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27.发明授权公开(公告)号：US10418137B2
公开(公告)日：2019-09-17
申请号：US15634408
申请日：2017-06-27
Applicant: Holtec International
Inventor： Krishna P. Singh , Stephen J. Agace
Abstract: A neutron absorber apparatus for use in restoring reactivity control to a nuclear fuel rack. The apparatus comprises an elongated tubular insert assembly configured for insertion in a storage cell of the rack. First and second absorber plates, each formed of a boron-containing material, are coupled together by upper and lower stiffening bands at the insert extremities and form a longitudinally-extending cavity configured for receiving a fuel assembly. The absorber plates and stiffening bands may have a rectilinear cross sectional configuration in one embodiment. At least one elastically deformable locking protrusion mounted proximate to the lower end of the absorber plates lockingly engages an available lower edge disposed in the cell sidewall above its bottom end. This fixes the tubular insert axially in the cell, thereby preventing its withdrawal after installing the insert. In one embodiment, the edge may be the bottom of existing absorber sheathing in the cell.
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公开(公告)号：US10297356B2
公开(公告)日：2019-05-21
申请号：US15584692
申请日：2017-05-02
Applicant: Holtec International
Inventor： Richard M. Springman , Stephen J. Agace , Krishna P. Singh
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.
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29.发明授权公开(公告)号：US10026514B2
公开(公告)日：2018-07-17
申请号：US14590506
申请日：2015-01-06
Applicant: Holtec International, Inc.
Inventor： Krishna P. Singh , Stephen J. Agace
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.
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30.发明申请公开(公告)号：US20180025796A1
公开(公告)日：2018-01-25
申请号：US15671830
申请日：2017-08-08
Applicant: Holtec International
Inventor： Krishna P. Singh , Stephen J. Agace
Abstract: An apparatus for supporting radioactive fuel assemblies, such as spent nuclear fuel. In one aspect, the invention is an apparatus, which can be in the form of a fuel rack having adjustable height pedestals.
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