Patents by Inventor Krishna P. Singh

Krishna P. Singh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10468145
    Abstract: An environmentally sequestered nuclear spent fuel pool in one embodiment includes sidewalls and a base slab that confine a water impoundment. The pool includes fuel racks containing spent fuel assemblies which heat the water via radioactive decay. A dual liner system enclosing the pool forms an impervious barrier providing redundant provisions for preventing leakage of contaminated pool water into the environment. An interstitial space is formed between the liners which may be maintained at sub-atmospheric pressures by a vacuum pump system that evacuates the space. By maintaining the pressure in the space at a negative pressure with corresponding boiling point less than the temperature of the pool water, any leakage through the inner-most liner into the interstitial space will vaporize and be extracted via the pump for signaling a potential leak in the liner system.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: November 5, 2019
    Inventor: Krishna P. Singh
  • Publication number: 20190333651
    Abstract: A nuclear steam supply system utilizing gravity-driven natural circulation for primary coolant flow through a fluidly interconnected reactor vessel and a steam generating vessel. In one embodiment, the steam generating vessel includes a plurality of vertically stacked heat exchangers operable to convert a secondary coolant from a saturated liquid to superheated steam by utilizing heat gained by the primary coolant from a nuclear fuel core in the reactor vessel. The secondary coolant may be working fluid associated with a Rankine power cycle turbine-generator set in some embodiments. The steam generating vessel and reactor vessel may each be comprised of vertically elongated shells, which in one embodiment are arranged in lateral adjacent relationship. In one embodiment, the reactor vessel and steam generating vessel are physically discrete self-supporting structures which may be physically located in the same containment vessel.
    Type: Application
    Filed: July 10, 2019
    Publication date: October 31, 2019
    Inventors: Krishna P. Singh, Joseph Gearald Leo Rajkumar
  • Publication number: 20190328189
    Abstract: An apparatus, system and method for handling and translating high level radioactive waste. The apparatus comprises a body for supporting the cask close to the ground so that the cask and the apparatus can pass underneath over head doors. The apparatus further comprises rollers for translating the cask. The apparatus additionally supports the storage cask during spent nuclear fuel transfer procedures.
    Type: Application
    Filed: June 17, 2019
    Publication date: October 31, 2019
    Inventor: Krishna P. Singh
  • Publication number: 20190326028
    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.
    Type: Application
    Filed: June 10, 2019
    Publication date: October 24, 2019
    Inventor: Krishna P. SINGH
  • Patent number: 10446287
    Abstract: An underground ventilated system for storing nuclear waste materials. The system includes a storage module having an outer shell defining an internal cavity and an inner shell. A majority of the height of the outer shell may be disposed below grade. The outer shell may include a hermetically sealed bottom. First and second canisters are positioned in lower and upper portions within the cavity respectively in vertically stacked relationship. A centering and spacing ring assembly is interspersed between the first and second canisters to transfer the weight of the upper second canister to the lower first canister. The assembly may include centering lugs which laterally restrain the first and second canisters in case of a seismic event. A natural convection driven ventilated air system cools the canisters to remove residual decay heat to the atmosphere. In one non-limiting embodiment, the shells are made of steel.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: October 15, 2019
    Inventor: Krishna P. Singh
  • Patent number: 10446285
    Abstract: An apparatus, system and method for handling and translating high level radioactive waste. The apparatus comprises a body for supporting the cask close to the ground so that the cask and the apparatus can pass underneath over head doors. The apparatus further comprises rollers for translating the cask. The apparatus additionally supports the storage cask during spent nuclear fuel transfer procedures.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: October 15, 2019
    Inventor: Krishna P. Singh
  • Publication number: 20190283191
    Abstract: A vertical bundle air-cooled heat exchanger. In one embodiment, the invention can be a vertical bundle air-cooled condenser comprising: at least one tube bundle assembly comprising: a tube bundle comprising a plurality of finned tubes arranged in a substantially vertical and side-by-side orientation, each of the plurality of finned tubes comprising a cavity; a top header pipe comprising an inlet header cavity operably coupled to a source of steam; a bottom header pipe comprising an outlet header cavity for collecting condensate; top ends of the plurality of finned tubes coupled to the top header pipe and the bottom ends of the plurality of finned tubes coupled to the bottom header pipe; and a shell having an open top end and open bottom end, the at least one tube bundle assembly positioned within the shell.
    Type: Application
    Filed: June 5, 2019
    Publication date: September 19, 2019
    Inventors: Krishna P. Singh, Indresh Rampall, Joseph Gerald Leo Rajkumar, Frank David Sanderlin
  • Patent number: 10418136
    Abstract: The present invention provides a system and method for reclaiming energy from the heat emanating from spent nuclear fuel contained within a canister-based dry storage system. The inventive system and method provides continuous passive cooling of the loaded canisters by utilizing the chimney-effect and reclaims the energy from the air that is heated by the canisters. The inventive system and method, in one embodiment, is particularly suited to store the canisters below-grade, thereby utilizing the natural radiation shielding properties of the sub-grade while still facilitating passive air cooling of the canisters. In another embodiment, the invention focuses on a special arrangement of the spent nuclear fuel within the canisters so that spent nuclear fuel that is hotter than that which is typically allowed to be withdrawn from the spent fuel pools can be used in a dry-storage environment, thereby increasing the amount energy that can be reclaimed.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: September 17, 2019
    Inventors: Krishna P. Singh, John D. Griffiths, Debabrata Mitra-Majumdar
  • Patent number: 10418137
    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.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: September 17, 2019
    Inventors: Krishna P. Singh, Stephen J. Agace
  • Patent number: 10410756
    Abstract: A container for storing and/or transporting spent nuclear fuel. The container includes a body that defines an internal cavity that holds the spent nuclear fuel and an outer surface. The outer surface has holes formed therein into which trunnions are positioned. The container can be lifted by a lift yoke by coupling the lift yoke to the trunnions. The trunnions may include first and second components such that the first component is slidable in its axial direction relative to the second component when a force that exceeds a threshold acts on the second component. Thus, the second component may be slidable between a protruded state in which a portion of the second component protrudes from the outer surface of the body and a retracted state in which the second component does not protrude from the outer surface of the body.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: September 10, 2019
    Inventor: Krishna P. Singh
  • Publication number: 20190274070
    Abstract: Disclosed herein are systems and methods for the creation, maintenance and management of virtual overlay networks across multiple communication networks managed by service providers. The simple creation and management of network overlays is accomplished via a network orchestrator manager, allowing for automation of configuration of connected network devices throughout an entire organization's network, regardless of the physical location of each device.
    Type: Application
    Filed: May 16, 2019
    Publication date: September 5, 2019
    Inventors: David Anthony Hughes, Santosh Bheemarajaiah, Damon John Ennis, David Holt Merwin, Rolf Muralt, Pawan Kumar Singh, Theodore Ernest Tedijanto, Lokesh Lingarajan, Edward P. Travalia, Krishna Kumar Sadasivam, Shyh Pei Yen, Abhelaksh Thakur, Catrina A. Torda
  • Patent number: 10395783
    Abstract: A nuclear steam supply system utilizing gravity-driven natural circulation for primary coolant flow through a fluidly interconnected reactor vessel and a steam generating vessel. In one embodiment, the steam generating vessel includes a plurality of vertically stacked heat exchangers operable to convert a secondary coolant from a saturated liquid to superheated steam by utilizing heat gained by the primary coolant from a nuclear fuel core in the reactor vessel. The secondary coolant, may be working fluid associated with a Rankine power cycle turbine-generator set in some embodiments. The steam generating vessel and reactor vessel may each be comprised of vertically elongated shells, which in one embodiment are arranged in lateral adjacent relationship. In one embodiment, the reactor vessel and steam generating vessel are physically discrete self-supporting structures which may be physically located in the same containment vessel.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: August 27, 2019
    Inventors: Krishna P. Singh, Joseph Rajkumar
  • Patent number: 10373722
    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.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: August 6, 2019
    Inventor: Krishna P. Singh
  • Publication number: 20190234689
    Abstract: An axial flow baffle for a shell and tube heat exchanger includes a substantially planar body configured for transverse arrangement in a longitudinally elongated shell of the shell and tube heat exchanger, a plurality of axial flow tube apertures each comprising a central tube hole configured to receive a tube of the heat exchanger, and an array of peripheral primary flow holes circumferentially spaced apart around the tube hole. The primary flow holes each interrupt the central tube hole and formed a radially inward projecting tube support protrusions between the primary flow holes which engage a single tube. Each primary flow hole has a non-polygonal configuration, which may be semicircular in some embodiments. The primary flow holes create axial flow around the periphery of the tubes through the baffles. In another aspect, a hybrid cross-flow baffle includes a combination of axial flow tube apertures and circular tube support holes.
    Type: Application
    Filed: April 11, 2019
    Publication date: August 1, 2019
    Inventors: Krishna P. Singh, Joseph Rajkumar
  • Patent number: 10343240
    Abstract: A vertical bundle air-cooled heat exchanger. In one embodiment, the invention can be a vertical bundle air-cooled condenser comprising: at least one tube bundle assembly comprising: a tube bundle comprising a plurality of finned tubes arranged in a substantially vertical and side-by-side orientation, each of the plurality of finned tubes comprising a cavity; a top header pipe comprising an inlet header cavity operably coupled to a source of steam; a bottom header pipe comprising an outlet header cavity for collecting condensate; top ends of the plurality of finned tubes coupled to the top header pipe and the bottom ends of the plurality of finned tubes coupled to the bottom header pipe; and a shell having an open top end and open bottom end, the at least one tube bundle assembly positioned within the shell.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: July 9, 2019
    Inventors: Krishna P. Singh, Indresh Rampall, Joseph Rajkumar, Frank David Sanderlin
  • Patent number: 10332642
    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.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: June 25, 2019
    Inventor: Krishna P. Singh
  • Patent number: 10313930
    Abstract: Disclosed herein are systems and methods for the creation, maintenance and management of virtual overlay networks across multiple communication networks managed by service providers. The simple creation and management of network overlays is accomplished via a network orchestrator manager, allowing for automation of configuration of connected network devices throughout an entire organization's network, regardless of the physical location of each device.
    Type: Grant
    Filed: May 6, 2016
    Date of Patent: June 4, 2019
    Assignee: Silver Peak Systems, Inc.
    Inventors: David Anthony Hughes, Santosh Bheemarajaiah, Damon John Ennis, David Holt Merwin, Rolf Muralt, Pawan Kumar Singh, Theodore E. Tedijanto, Lokesh Lingarajan, Edward P. Travalia, Krishna Kumar Sadasivam, Shyh Pei Yen, Abhelaksh Thakur, Catrina A. Torda
  • Patent number: 10311987
    Abstract: An autonomous facility for storing spent nuclear fuel includes a building forming an enclosed interior space containing a water-filled spent fuel pool. The pool includes fuel racks containing spent fuel assemblies which heat the water via radioactive decay. A passive cooling system includes a submerged heat exchanger in the pool and an air cooled heat exchanger located in ambient air outside the building at a higher elevation than the pool heat exchanger. A heat transfer working fluid circulates in a closed flow loop between the heat exchangers via unpumped natural gravity driven flow to cool the fuel pool. The air cooled heat exchanger may be enclosed in a concrete reinforced silo adjoining the building for impact protection. The building may include a cask pit formed integrally with the pool to allow fuel assembles to be removed from a transport cask and loaded into the fuel rack underwater.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: June 4, 2019
    Inventors: Krishna P. Singh, Joseph Rajkumar
  • Patent number: 10295266
    Abstract: A tubular heat exchanger having a plurality of shell-side and tube-side fluid passes. The heat exchanger includes an elongated cylindrical shell, a head coupled thereto, and a tube bundle positioned in the shell and supported in part by a tube sheet attached to the head. The shell of the heat exchanger may include a plurality of vertically stacked shell-side compartments each defining a shell-side pass. The head of the heat exchanger may have a plurality of tube-side compartments each defining a tube-side pass. A tube-side fluid enters the head and flows through the tube bundle progressively through a series of tube-side passes to heat the fluid with a shell-side fluid. Each shell-side pass contains multiple tube-side passes. The tube-side fluid may perform a plurality of horizontally arranged tube-side fluid passes in each vertically stacked shell-side fluid pass before cascading vertically to a next shell-side fluid pass.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: May 21, 2019
    Inventors: Krishna P. Singh, Vytautas Vincas Maciunas
  • Patent number: 10297356
    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.
    Type: Grant
    Filed: May 2, 2017
    Date of Patent: May 21, 2019
    Inventors: Richard M. Springman, Stephen J. Agace, Krishna P. Singh