JOHN D GRIFFITHS
Engineers in West Deptford, NJ
License number
Pennsylvania PE041269E
Category
Engineers
Type
Professional Engineer
Address
Address
2
West Deptford, NJ 08096
Pennsylvania
Pennsylvania
Personal information
See more information about JOHN D GRIFFITHS at radaris.comName
Address
Phone
506 Heritage Ln, Murrysville, PA 15668
4 Forman Rd, Millstone Township, NJ 08535
525 Butler St, Wyoming, PA 18644
5 Dunlap Dr, Parlin, NJ 08859
5444 Devonshire Ct, Laurys Sta, PA 18059
Professional information
System And Method For Preparing A Container Loaded With Wet Radioactive Elements For Dry Storage
US Patent:
8561318, Oct 22, 2013
Filed:
Dec 22, 2008
Appl. No.:
12/342022
Inventors:
Krishna P. Singh - Jupiter FL, US
John D. Griffiths - Deptford NJ, US
John D. Griffiths - Deptford NJ, US
International Classification:
F26B 3/00
US Classification:
34443, 34468, 34474, 34491
Abstract:
A method for preparing a container holding high level radioactive waste for dry storage. In one aspect, the method includes: (a) providing a gas circulation system comprising a condensing module, a desiccant module, a gas circulator module; (b) connecting the gas circulation system to the canister so as to form a hermetically sealed closed-loop path that includes the cavity; (c) filling the hermetically sealed closed-loop path with a non-reactive gas; (d) circulating the non-reactive gas through the hermetically sealed closed-loop path until the condensing module is no longer removing substantial amounts of water from the circulating non-reactive gas, wherein the desiccant module is sealed off from the hermetically sealed closed-loop path during step (d); and (e) adding the desiccant module to the hermetically sealed closed-loop path and continuing to circulate the non-reactive gas through the hermetically sealed closed-loop path, the desiccant module dehumidifying the circulating the non-reactive gas.
System And Method For Preparing A Container Loaded With Wet Radioactive Elements For Dry Storage
US Patent:
2014004, Feb 20, 2014
Filed:
Oct 22, 2013
Appl. No.:
14/060384
Inventors:
John D. GRIFFITHS - Deptford NJ, US
Assignee:
Holtec International, Inc. - Marlton NJ
International Classification:
G21F 5/06, G21F 9/34, F26B 5/12, G21C 19/32
US Classification:
34443
Abstract:
A method for preparing a cavity loaded with wet radioactive elements for dry storage, the method including: connecting a condensing module, a vacuum module, and a gas circulator module to the cavity so as to form a hermetically sealed closed-loop path that includes the cavity; filling the closed-loop path with a non-reactive gas; circulating the non-reactive gas through the closed-loop path until the condensing module is no longer removing substantial amounts of water from the circulating non-reactive gas, wherein the vacuum module is sealed off from the closed-loop path during the circulating; discontinuing the circulation of the non-reactive gas through the closed-loop path; fluidly coupling the vacuum module to the cavity and fluidly isolating the cavity and the vacuum module; and applying a vacuum pressure to the cavity via the vacuum module so as to create a sub-atmospheric pressure within the cavity.
Ventilated System For Storing High Level Radioactive Waste
US Patent:
2012003, Feb 16, 2012
Filed:
Aug 12, 2011
Appl. No.:
13/208915
Inventors:
Krishna P. Singh - Hobe Sound FL, US
John D. Griffiths - Deptford NJ, US
John D. Griffiths - Deptford NJ, US
International Classification:
B65D 51/16
US Classification:
2203671
Abstract:
A system for storing high level radioactive waste. In one embodiment, the invention can be a system comprising 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 comprising an annular air inlet plenum and an annular air inlet passageway, the annular air inlet plenum extending radially inward from an outer surface of the overpack body to the annular air inlet passageway, the annular air inlet passageway extending upward from the annular air inlet plenum to an opening in the floor, and an air outlet vent in the overpack lid for removing warmed air from the cavity.
System And Method For Reclaiming Energy From Heat Emanating From Spent Nuclear Fuel
US Patent:
2011028, Nov 24, 2011
Filed:
Apr 21, 2011
Appl. No.:
13/092143
Inventors:
Krishna P. Singh - Hobe Sound FL, US
John D. Griffiths - Deptford NJ, US
John D. Griffiths - Deptford NJ, US
International Classification:
G21C 19/00
US Classification:
376272
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.
Method Of Transferring High Level Radionactive Materials, And System For The Same
US Patent:
2011015, Jun 23, 2011
Filed:
Dec 16, 2010
Appl. No.:
12/970901
Inventors:
Krishna P. Singh - Jupiter FL, US
John D. Griffiths - Deptford NJ, US
John D. Griffiths - Deptford NJ, US
International Classification:
G21F 5/00, G21C 19/07
US Classification:
376272
Abstract:
An apparatus and method for inter-unit transfer of spent nuclear fuel. In one aspect, the invention is a method of transferring high level radioactive waste comprising: a) loading high level radioactive waste into a water-filled cavity of a canister body having an open top end at a first location; b) coupling a lid to the canister body to enclose the open top end; c) removing a volume of water from the cavity so that a water level of the water within the cavity is above a top end of the high level radioactive waste and a space exists between the water level and a bottom surface of the lid; d) hermetically sealing the cavity; and e) transferring the canister to a second location, the water level remaining above the top end of the high level radioactive waste during the transfer.
Snap-In Insert For Reactivity Control In Spent Nuclear Fuel Pools And Casks
US Patent:
2013034, Dec 26, 2013
Filed:
Jun 24, 2013
Appl. No.:
13/925585
Inventors:
Stephen E. THOMPSON - Bel Air MD, US
John D. GRIFFITHS - Deptford NJ, US
Richard M. SPRINGMAN - Drexel Hill PA, US
John D. GRIFFITHS - Deptford NJ, US
Richard M. SPRINGMAN - Drexel Hill PA, US
International Classification:
G21F 5/012
US Classification:
376272
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.