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John, C.D. Jr.; Sparrow, J.A.
Westinghouse Electric Corp., Pittsburgh, PA (United States)
Westinghouse Electric Corp., Pittsburgh, PA (United States)
AbstractAbstract
[en] This patent describes a control rod guide thimble having a main hollow tube defining a substantial portion of the length of the guide thimble. It comprises: a lower tubular portion of the man hollow tube; and an auxiliary hollow tube having concentric exterior and interior surfaces, the auxiliary tube being inserted in the lower portion of the main hollow tube and having an outside diameter slightly less than an inside diameter of the main tube to permit a close fitting relationship between the exterior surface and the auxiliary tube and an interior surface of the main tube lower portion, the auxiliary tube having an upper end portion with an inside surface portion in axial cross-section flaring in inclined relation upwardly and outwardly to provide a tapered transition extending between and connecting the interior surface of the auxiliary tube with the exterior surface thereof; and an end plug attached to a lower end of the auxiliary tube
Primary Subject
Source
26 Nov 1991; 29 May 1990; vp; US PATENT DOCUMENT 5,068,083/A/; Patent and Trademark Office, Box 9, Washington, DC 20232 (United States); ?: 29 May 1990
Record Type
Patent
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AbstractAbstract
No abstract available
Primary Subject
Record Type
Journal Article
Journal
Karyoku Hatsuden; v. 22(4); p. 419-424
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Lichtenberger, H.V.; Ruoss, C.W.
Combustion Engineering, Inc., Windsor, CT (USA)
Combustion Engineering, Inc., Windsor, CT (USA)
AbstractAbstract
[en] Control is provided for short or part-length control rods used to govern power distribution within the reactor core, to prevent them from dropping to the bottom of the reactor upon loss of electricity. A spring-operated latch is fixed on the control rod support to positively mechanically lock the rod against movement in either direction. Two magnetically-actuated alternately-operating rod-moving members are preferably provided, each carrying its own independently-actuated latch or gripper mechanism for connecting the moving member with the rod or for disconnecting it. (LL)
Primary Subject
Source
3 Feb 1976; 12 p; CA PATENT DOCUMENT 983179/A/; Available from Micromedia Ltd., 165 Hotel de Ville, Hull, Quebec, Canada J8X 3X2
Record Type
Patent
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AbstractAbstract
[en] A vertical control rod includes an absorber formed of flexible members and suspended by a traction device below the reactor core during operation of the reactor and a tensional spring for drawing the absorber into the reactor core to shut off the reactor. The control rod is operable independently of gravity and avoids jamming of the absorber in the guide
Original Title
Patent
Primary Subject
Source
13 Jan 1976; 6 p; US PATENT DOCUMENT 3,932,215
Record Type
Patent
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Publication YearPublication Year
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
AbstractAbstract
[en] A fluidic self-actuating control assembly for use in a reactor is described wherein no external control inputs are required to actuate (scram) the system. The assembly is constructed to scram upon sensing either a sudden depressurization of reactor inlet flow or a sudden increase in core neutron flux. A fluidic control system senses abnormal flow or neutron flux transients and actuates the system, whereupon assembly coolant flow reverses, forcing absorber balls into the reactor core region
Original Title
Patent
Primary Subject
Source
6 Feb 1979; 8 p; US PATENT DOCUMENT 4,138,320/A/; PAT-APPL-920,416.
Record Type
Patent
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Publication YearPublication Year
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Prodea, I., E-mail: iosif.prodea@nuclear.ro
RATEN Institute for Nuclear Research Pitesti, (Romania)
Proceedings of NUCLEAR 2016 the 9th annual international conference on sustainable development through nuclear research and education. Part 1/3
RATEN Institute for Nuclear Research Pitesti, (Romania)
Proceedings of NUCLEAR 2016 the 9th annual international conference on sustainable development through nuclear research and education. Part 1/3
AbstractAbstract
[en] A shutdown system no. 1 (SDS1) with mechanical absorbing rods has been designed for an advanced CANDU nuclear reactor. The design addresses static neutronic properties and their verification when individual rods and entire rod system are fully inserted in the reactor core. The primary design started with the accommodation of the rods in a tight interval of the advanced lattice pitch. The shut-off rod design shape and elementary lattice neutronic properties were found out using the WIMS-PIJXYZ methodology. The WIMS-PIJXYZ methodology was developed in INR Pitesti and it is based on neutron transport equation solving in two and three dimensional geometries. A preliminary advanced DIREN core model has previously been developed and used to calculate the individual and entire SDS1 static reactivity. The comparison to a generic CANDU 6 SDS1 rods reactivities showed that the designed SDS1 is able to perform as well as the CANDU 6 SDS1 basic design does. (authors)
Primary Subject
Source
Paraschiv, Irina Maria (ed.); Turcu, Ilie (Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania)); Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania). Funding organisation: National Authority for Scientific Research, Bucharest (Romania); 332 p; ISSN 2066-2955;
; 2016; p. 54-63; NUCLEAR 2016: 9. annual international conference on sustainable development through nuclear research and education; Pitesti (Romania); 18-20 May 2016; Also available from author(s) or Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (RO); 14 refs., 4 tabs.

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Miscellaneous
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Reconstitutable control assembly having removable control rods with detachable split upper end plugs
Gjertsen, R.K.; Knott, R.P.; Sparrow, J.A.
Westinghouse Electric Corp., Pittsburgh, PA (USA)
Westinghouse Electric Corp., Pittsburgh, PA (USA)
AbstractAbstract
[en] This patent describes, for use in facilitating replacement of a neutron absorber control rod on a control assembly spider structure, an end plug. It comprises a pair of separate upper and lower plug portions; the upper section of the upper plug portion being configured for rigid attachment; the middle section of the upper plug portion having angularly displaced flat surfaces formed on the exterior
Primary Subject
Secondary Subject
Source
19 Feb 1991; 26 Oct 1989; vp; US PATENT DOCUMENT 4,993,864/A/; Patent and Trademark Office, Box 9, Washington, DC 20232 (USA); ?: 26 Oct 1989
Record Type
Patent
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Reference NumberReference Number
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INIS IssueINIS Issue
AbstractAbstract
[en] A new part length rod is provided which may be used to control xenon induced power oscillations but also to contribute to shutdown reactivity when a rapid shutdown of the reactor is required. The part length rod consists of a control rod with three regions. The lower control region is a longer weaker active portion separated from an upper stronger shorter poison section by an intermediate section which is a relative non-absorber of neutrons. The combination of the longer weaker control section with the upper high worth poison section permits the part length rod to be scrammed into the core. When a reactor shutdown is required but also permits the control rod to be used as a tool to control power distribution in both the axial and radial directions during normal operation
Original Title
Patent
Primary Subject
Source
2 Oct 1979; 6 p; US PATENT DOCUMENT 4,169,759/A/
Record Type
Patent
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Publication YearPublication Year
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue
Appel, M.J.
Washington Closure Hanford (United States). Funding organisation: US Department of Energy (United States)
Washington Closure Hanford (United States). Funding organisation: US Department of Energy (United States)
AbstractAbstract
[en] This cleanup verification package documents completion of remedial action for the 118-F-3, Minor Construction Burial Ground waste site. This site was an open field covered with cobbles, with no vegetation growing on the surface. The site received irradiated reactor parts that were removed during conversion of the 105-F Reactor from the Liquid 3X to the Ball 3X Project safety systems and received mostly vertical safety rod thimbles and step plugs
Primary Subject
Secondary Subject
Source
4 Jan 2007; 88 p; AC06-05RL14655; Also available from OSTI as DE00945298; PURL: https://www.osti.gov/servlets/purl/945298-x3yctV/; doi 10.2172/945298
Record Type
Report
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AbstractAbstract
No abstract available
Original Title
Reacteur nucleaire a recharge en combustible rapide
Primary Subject
Source
13 Sep 1972; 11 p; FR PATENT DOCUMENT 2154507/E/; Available from INPI, Paris; Available from Institut National de la Propriete Industrielle, Paris (France) Addition to the US Patent 7124816 Priority claim 13 Sep 1971.
Record Type
Patent
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