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Class Information
Number: 376/364
Name: Induced nuclear reactions: processes, systems, and elements > Reactor structures > Circulating fluid within reactor > Fuel assembly supports > Fuel assembly holddown or locking means
Description: Subject matter wherein means are provided for maintaining the fuel assembly in its desired position within the reactor against the force of the coolant.

Sub-classes under this class:

Class Number Class Name Patents
376/365 Hydraulic or pneumatic 15

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8670519 Nuclear fuel assembly hold down spring Mar. 11, 2014
8666018 Nuclear fuel rod plenum spring assembly Mar. 4, 2014
8483348 Method of providing a hold-down force upon a nuclear fuel assembly Jul. 9, 2013
8477900 Hold-down spring unit for top nozzle of nuclear fuel assembly having improved hold-down performance and top nozzle for nuclear fuel assembly having the same Jul. 2, 2013
8385497 Channel confinement method for dry-storage of BWR fuel bundles Feb. 26, 2013
8229055 Top nozzle for nuclear fuel assembly Jul. 24, 2012
8208597 Channel confinement system and method for dry-storage of BWR fuel bundles Jun. 26, 2012
7995701 Nuclear core component hold-down assembly Aug. 9, 2011
7577229 Method for limiting the maintenance loads applied to a fuel assembly of a nuclear reactor and fuel assembly Aug. 18, 2009
7505547 Assembly and method for mounting a fuel assembly having a predefined orientation within a nuclear reactor Mar. 17, 2009
7453972 Nuclear fuel assembly control rod drive thimble to bottom nozzle connector Nov. 18, 2008
6950486 Delay apparatus and method Sep. 27, 2005
6888912 Device for positioning and axially aligning a fuel assembly and process and apparatus for restoring a positioning element May. 3, 2005
6738447 High energy absorption top nozzle for a nuclear fuel assembly May. 18, 2004
6370214 Radiation induced growth indication apparatus for pressurized water reactor nuclear fuel assemblies Apr. 9, 2002
6310931 Device and method for locking rods in a bottom tie plate of a fuel assembly Oct. 30, 2001
6178219 Holder for fuel elements and method for repairing such a holder Jan. 23, 2001
6154514 Nuclear reaction fuel assembly for a nuclear reactor fuel assembly Nov. 28, 2000
6115440 Quick release, removable top nozzle assembly Sep. 5, 2000
6097779 Fuel bundle and control rod assembly for a nuclear reactor Aug. 1, 2000
5812624 Core of a pressurized water nuclear reactor and top nozzle of a fuel assembly of the core Sep. 22, 1998
5600694 Nuclear fuel upper end fitting quick disconnect joint Feb. 4, 1997
5574760 Method and apparatus for supporting a shroud in a nuclear reactor Nov. 12, 1996
5490190 Alignment pin and method for aligning a nuclear fuel assembly with respect to a core plate disposed in a nuclear reactor pressure vessel Feb. 6, 1996
5479464 Expandable top nozzle and device for securing same to a nuclear fuel assembly Dec. 26, 1995
5452334 Pressurized water reactor nuclear fuel assembly with disengaging upper tie plate corner post Sep. 19, 1995
5390222 Fuel assembly or control assembly with releasable locking between the case and the upper or lower end part of the assembly Feb. 14, 1995
5347560 Fuel assembly with secured rod ends at the foot Sep. 13, 1994
5309491 Fuel assembly with secured rod ends at the foot May. 3, 1994
5297176 Remotely replaceable fuel assembly alignment pin Mar. 22, 1994
5289514 Fuel assembly for a boiling water reactor with a sealing spring between the foot part and the fuel assembly channel Feb. 22, 1994
5276721 Nuclear reactor fuel assembly Jan. 4, 1994
5274685 Non-levitating PWR fuel assembly Dec. 28, 1993
5272742 Upper end fitting Dec. 21, 1993
5271053 Holddown leaf spring assembly Dec. 14, 1993
5267287 Holddown leaf spring assembly having a lubricant coating Nov. 30, 1993
5259010 Replacement spacer pin with locking keys Nov. 2, 1993
5213757 Method for fixing a spring package to a top nozzle in a fuel assembly of a nuclear power reactor May. 25, 1993
5211907 Assembly for securing a centering pin within a bore of a nuclear reactor core plate May. 18, 1993
5207980 Top nozzle-mounted replacement guide pin assemblies May. 4, 1993
5200142 Nuclear fuel assembly top nozzle with improved peripheral hold-down assembly Apr. 6, 1993
5180549 Nuclear fuel assembly having double enclosure top nozzle subassembly Jan. 19, 1993
5164154 Apparatus for replacing a fuel guide pin in a nuclear fuel assembly Nov. 17, 1992
5141701 Bottom nozzle to lower grid attachment Aug. 25, 1992
5133926 Extended burnup top nozzle for a nuclear fuel assembly Jul. 28, 1992
5089215 Method of securing a centering pin for a nuclear fuel assembly Feb. 18, 1992
5057272 Nuclear fuel assembly top nozzle with improved arrangement of hold-down leaf spring assemblies Oct. 15, 1991
5053191 Fuel assembly holddown spring Oct. 1, 1991
5030413 Core internals of a water-cooled nuclear reactor Jul. 9, 1991
4988473 Self-latching reactivity-reducing device for use in on-site spent fuel assembly storage Jan. 29, 1991

1 2 3

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