公开(公告)号：US20240410343A1

公开(公告)日：2024-12-12

申请号：US18451235

申请日：2023-08-17

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. SINGH ,  Dharendra Yogi Goswami ,  Indresh Rampall

IPC: F03G6/00 ,  F24S10/30 ,  F24S20/20 ,  F24S80/20

Abstract: A solar power generation system includes a thermal energy storage vessel containing a thermal mass composition operable to store thermal energy, solar energy collection system, and power generation system. The collection system comprises a first closed flow loop including a solar collector which absorbs solar energy and heats a first working fluid. The heated first working fluid recirculates through a first closed flow loop through and heats the thermal mass composition. The generation system comprises a second closed flow loop including a turbine-generator. The second closed flow loop recirculates a second working fluid through the thermal mass composition to absorb thermal energy and heat the second working fluid which flows to the turbine and the generator produces electricity. The second working fluid may be water/steam or a compressible gas. The thermal mass composition comprises a mixture of a phase change material such as salt and a metallic material.

公开(公告)号：US20240387067A1

公开(公告)日：2024-11-21

申请号：US18780814

申请日：2024-07-23

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  Charles W. BULLARD

IPC: G21F5/12 ,  B23K5/02 ,  G21F5/005 ,  G21F5/012 ,  G21F5/10 ,  G21F9/34 ,  G21F9/36

Abstract: A dry storage systems for radioactive nuclear waste materials may include a double-walled canister system. The canister system may include a canister having a tubular inner shell defining an internal cavity for storing nuclear waste material, a first lid sealably welded to a first end of the inner shell, a primary base plate defining a peripheral edge portion and having an annular closure flange, and an annular full thickness butt weld formed at an abutment joint between the annular closure flange and a second end of the inner shell. The inner shell, first lid, and first end closure may collectively define a sealed primary pressure retention barrier. A tubular outer shell may adjoin the inner shell. The outer shell may be welded to the canister to form a hermetically sealed secondary pressure retention barrier.

公开(公告)号：US20240071641A1

公开(公告)日：2024-02-29

申请号：US18372353

申请日：2023-09-25

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. SINGH

IPC: G21F9/34 ,  G21F1/12 ,  G21F5/008 ,  G21F5/10 ,  G21F5/12

CPC classification number: G21F9/34 ,  G21F1/125 ,  G21F5/008 ,  G21F5/10 ,  G21F5/12

Abstract: A containment enclosure for shielding an outer cask containing an inner canister loaded with nuclear waste such as spent fuel rods. The enclosure includes a lower base portion at least partially embedded in a concrete pad and an upper radiation shielding portion defined by a shield jacket coupled to and supported by the lower base portion at a circumferential joint. Cavities of the base and shielding portions collectively define a contiguous containment space for the cask. A portion of the cask resides in each of the base and shielding portions which completely enclose and shield the cask to minimize radiation dosage of personnel in the environment surrounding the cask. The cask is cooled by a natural convectively-driven ambient cooling air ventilation system including air inlets at the circumferential joint of the enclosure. The concrete pad may be part of a spent nuclear fuel storage installation comprising plural cask containment enclosures.

公开(公告)号：US20230343478A1

公开(公告)日：2023-10-26

申请号：US18216544

申请日：2023-06-29

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  Paul Stefan ANTON ,  Richard M. SPRINGMAN ,  Robert MAHORTER

IPC: G21F5/005 ,  G21F5/08 ,  G21F9/34 ,  G21F5/12 ,  G21F5/10

CPC classification number: G21F5/005 ,  G21F5/08 ,  G21F9/34 ,  G21F5/12 ,  G21F5/10

Abstract: An apparatus for supporting spent nuclear fuel including a plurality of wall plates arranged in an intersecting manner to define a basket apparatus extending along a longitudinal axis. The basket apparatus may include a plurality of fuel cells and a plurality of flux traps between adjacent fuel cells. A plurality of reinforcement members may be positioned in the flux traps and may extend between opposing ones of the wall plates that form the flux traps. Each of the wall plates may be a slotted wall plate. The slotted wall plates may be interlocked with one another to form the basket apparatus. Each of the slotted wall plates may include an upper edge, a lower edge, and a plurality of plate slots formed in each of the upper and lower edges. The plate slots of the slotted wall plates may receive intersecting slotted wall plates.

公开(公告)号：US20230268095A1

公开(公告)日：2023-08-24

申请号：US18140795

申请日：2023-04-28

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  John D. GRIFFITHS ,  Frederick R. BIDRAWN

IPC: G21F5/12

CPC classification number: G21F5/12

Abstract: An impact amelioration system for nuclear fuel storage components in one embodiment includes a fuel storage canister and outer cask receiving the canister. The canister is configured for storing spent nuclear fuel or other high level radioactive waste. A plurality of impact limiter assemblies are disposed on the bottom closure plate of the cask at the canister interface. Each impact limiter assembly comprises an impact limiter plug frictionally engaged with a corresponding plug hole formed in the cask closure plate. The canister rests on tops of the plugs, which may protrude upwards beyond the top surface of the bottom closure lid. The plugs and holes may mating tapered and frictionally engaged surfaces. During a cask drop event, the canister drives the plugs deeper into the plug holes and elastoplastically deform to dissipate the kinetic impact energy and protect the structural integrity of the canister and its contents.

公开(公告)号：US20230110615A1

公开(公告)日：2023-04-13

申请号：US17977342

申请日：2022-10-31

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  Charles W. BULLARD, II

IPC: G21F5/12 ,  G21F5/10 ,  G21F5/005 ,  G21F9/34

Abstract: A dry storage systems for radioactive nuclear waste materials may include a double-walled canister system. The canister system may include a canister having a tubular inner shell defining an internal cavity for storing nuclear waste material, a first lid sealably welded to a first end of the inner shell, a primary base plate defining a peripheral edge portion and having an annular closure flange, and an annular full thickness butt weld formed at an abutment joint between the annular closure flange and a second end of the inner shell. The inner shell, first lid, and first end closure may collectively define a sealed primary pressure retention barrier. A tubular outer shell may adjoin the inner shell. The outer shell may be welded to the canister to form a hermetically sealed secondary pressure retention barrier.

公开(公告)号：US20230080268A1

公开(公告)日：2023-03-16

申请号：US17982060

申请日：2022-11-07

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. SINGH ,  Joseph Gerald Leo RAJKUMAR ,  Indresh RAMPALL ,  Frank David SANDERLIN ,  William G. SCHOLFIELD ,  Dmitriy Yakov KATS ,  Joseph Paul MOSHER ,  Robert Charles SLOAN ,  Thomas G. HAYNES, III

IPC: B23P15/26 ,  F28D7/10 ,  F28B1/06 ,  F28B9/10 ,  F28F1/16 ,  F28F1/20 ,  F28F1/00 ,  B21C23/00 ,  F28D1/02

Abstract: A vertical bundle air-cooled heat exchanger, a finned tube assembly for an air cooled condenser and method for forming the same, and a system for removing thermal energy generated by radioactive materials. In one aspect, an air cooled condenser sized for industrial and commercial application includes an inlet steam distribution header for conveying steam, a condensate outlet header for conveying condensate, an array of tube bundles each having a plurality of finned tube assemblies having a bare steel tube with an exposed outer surface and a set of aluminum fins brazed directly onto the tube by a brazing filler metal. The steel tubes may be spaced apart by the aluminum fins and have an inlet end fluidly coupled to the inlet steam distribution header and an outlet end fluidly coupled to the outlet header. A forced draft fan may be arranged to blow air through the tube bundles.

公开(公告)号：US20220367079A1

公开(公告)日：2022-11-17

申请号：US17831809

申请日：2022-06-03

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. SINGH

IPC: 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.

公开(公告)号：US20220277864A1

公开(公告)日：2022-09-01

申请号：US17746804

申请日：2022-05-17

Applicant: HOLTEC INTERNATIONAL

Inventor： Krishna P. SINGH ,  Stephen J. AGACE

IPC: G21F5/10

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.

公开(公告)号：US20220246321A9

公开(公告)日：2022-08-04

申请号：US17083582

申请日：2020-10-29

Applicant: Holtec International

Inventor： Krishna P. SINGH ,  Stephen J. AGACE

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

Abstract: An apparatus for supporting radioactive fuel assemblies, such as spent nuclear fuel. In one aspect, the apparatus is in the form of a fuel rack having adjustable height pedestals. In another aspect, the apparatus is a canister including a first pressure vessel forming a first cavity and a second pressure vessel forming a second cavity, the first pressure vessel located in the second cavity of the second pressure vessel. An inner surface of the second pressure vessel may be in continuous surface contact with an outer surface of the first pressure vessel to form a dual-walled canister.