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Class Information
Number: 976/DIG.118
Name: Nuclear technology > Control of nuclear reaction [g21c-7/00] > By application of neutron-absorbing material (i.e., material with absorption cross section very much in excess of reflection cross section) [g21c-7/06] > By displacement of solid control elements (e.g., control rods) [g21c-7/08]

Sub-classes under this class:

Class Number Class Name Patents
976/DIG.119 Construction of control elements [g21c-7/10] 39
976/DIG.129 Disposition of shock-absorbing devices; braking arrangements [g21c-7/20] *** (shock absorbers in general f16f) 14
976/DIG.125 Means for moving control elements to desired position [g21c-7/12] 74
976/DIG.128 Means for obtaining differential movement of control elements [g21c-7/18] 6

Patents under this class:

Patent Number Title Of Patent Date Issued
5106572 Centering and fixation device for a cluster guide flange of a core plate of a nuclear reactor Apr. 21, 1992
5098647 Guide tube insert assembly for use in a nuclear reactor Mar. 24, 1992
5093075 Upper internal nuclear reactor equipments including a flow separation device Mar. 3, 1992
5089212 Apparatus for controlling the power output of a nuclear reactor Feb. 18, 1992
5066451 Single-step multiple repositionings of control rod cluster assembly during each nuclear reactor fuel cycle Nov. 19, 1991
5053189 System providing improved guidance support with restricted coolant flow for control rods in the upper head plenum of a nuclear reactor Oct. 1, 1991
5035852 Tapered leaf support pin for operating plant guide tubes Jul. 30, 1991
5024808 Combined support column and guide tube for use in a nuclear reactor Jun. 18, 1991
5023044 Nuclear reactor control assembly Jun. 11, 1991
4937039 Four pin mounting system for nuclear reactor control rod guide tubes Jun. 26, 1990
4917855 Apparatus for the shutdown of a high temperature nuclear reactor Apr. 17, 1990
4879086 Neutron economic reactivity control system for light water reactors Nov. 7, 1989
4876061 Resiliently loaded lateral supports for cantilever-mounted rod guides of a pressurized water reactor Oct. 24, 1989
4857264 Frictionally loaded top end supports for cantilever-mounted rod guides of a pressurized water reactor Aug. 15, 1989
4844856 Process for automatic regulation of the soluble boron content of the cooling water of a pressurized water nuclear reactor Jul. 4, 1989
4793965 Simplified, flexible top end support for cantilever-mounted rod guides of a pressurized water reactor Dec. 27, 1988
4770845 Self-actuating reactor shutdown system Sep. 13, 1988
4764339 High flux reactor Aug. 16, 1988
4756067 Manual replacement of old split-pin assemblies by new split-pin assemblies Jul. 12, 1988
4748733 Removal of old split-pin assemblies from guide tubes and replacement by new split-pin assemblies Jun. 7, 1988
4738023 Hooking apparatus for a removable constriction plug Apr. 19, 1988
4720898 Replacement of split pins in guide tubes Jan. 26, 1988
4713211 High temperature pebble bed reactor and process for shut-down Dec. 15, 1987
4690593 Tool for cutting locking cups from guide tube mounting screws in a nuclear reactor Sep. 1, 1987
4664879 Guide tube flow restrictor May. 12, 1987
4664871 Nuclear power installation with a high temperature pebble bed reactor May. 12, 1987
4636350 Process for the control and shutdown of a gas-cooled reactor Jan. 13, 1987
4606881 Upper internal equipment of a pressurized water nuclear reactor Aug. 19, 1986
4587085 Nuclear reactor safety device May. 6, 1986
4562038 Device for guiding a control cluster in a nuclear reactor Dec. 31, 1985
4548784 Nuclear reactor power control system Oct. 22, 1985
4372912 Method of controlling the reactivity of a gas-cooled core reactor Feb. 8, 1983
4322853 Nuclear reactor control Mar. 30, 1982
4248667 Method of operating nuclear reactors Feb. 3, 1981
4246068 Boiling reactor with direct feed water input to the fuel boxes Jan. 20, 1981
4175004 Fuel assembly guide tube Nov. 20, 1979
4173513 Nuclear reactor with control rods Nov. 6, 1979
4152204 Device for controlling the power output of a core reactor and for turning off the same May. 1, 1979
4148685 Process and apparatus for shutdown and control of a gas-cooled nuclear reactor Apr. 10, 1979
4106984 Rotating safety drum nuclear reactor Aug. 15, 1978
4092216 Nuclear reactor May. 30, 1978
4046624 Method of operating a nuclear reactor Sep. 6, 1977
3997392 Control rod arrangement for gas-cooled nuclear reactor Dec. 14, 1976
3979257 Boiling-water reactor Sep. 7, 1976

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