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7620139 Method of improving nuclear reactor performance during reactor core operation  
In the method, performance of a nuclear reactor may be improved by implementing an operational solution for the nuclear reactor using at least one control rod criteria in order to increase scram...
7505545 Method for recognizing step movement sequence of control rod drive mechanism of nuclear reactor  
A method for recognizing the step movement sequence of a control rod drive mechanism of a nuclear reactor, which withdraws and inserts a control rod of a nuclear reactor, includes the steps of:...
7139355 Method of operating a nuclear power plant at multiple power levels  
A method of operating a nuclear power plant includes determining and licensing a maximum power level at which the power plant can be operated subsequent to the beginning of a fuel cycle, and with...
7139352 Reactivity control rod for core  
A reactivity control rod adapted to be used in a reactor core of a fast reactor and disposed at a substantially central portion of the reactor core for controlling a reactivity therein. The...
7139351 Method of and control system for controlling a nuclear reactor outlet temperature  
The invention relates to a control system for controlling an average temperature of a coolant at a reactor core outlet. The control system method detects an average temperature of the coolant at...
6934350 Core configuration for a nuclear reactor  
In an embodiment of the present invention, the core of a nuclear reactor includes a plurality of fuel cells and a plurality of large control rods. Each large control rod is about two times the...
6873671 Reactor manual control system  
In a boiling water reactor controlling each control rod hydraulically by driving a solenoid valve, the control system comprises an operation control means 41 having a duplicated data processing...
6865242 Method and device for restoring the fall-time of at least one control cluster for regulating reactivity in the core of a light-water-cooled nuclear reactor  
After a nuclear reactor has been stopped and allowed to cool down following a period of operation, action is taken in a pool of the nuclear reactor on at least one guide tube of the activated upper...
6862329 In-cycle shuffle  
According to the method, a reactor core is shut down during the operation cycle. One or more fuel bundles of the reactor core are then moved to new positions within the reactor core to increase a...
6721382 Absorber member and control rod  
An absorber body arranged to absorb radiation in a nuclear energy arrangement. The absorber body comprises more than one area with a locally reduced thickness.
6707870 Method for determining friction forces occurring on an object moving in a guide on an inaccessible site  
With this method it is possible to evaluate opposing friction forces occurring after a certain operating time on a mobile object in a guide. The method consists of measuring the variations in the...
6553090 Control system of nuclear power plant, and control method thereof  
A method of controlling a nuclear power plant includes determining a first maximum linear heat generation rate and a first minimum critical power ratio by a core monitoring system, and determining...
6285728 Control rod for nuclear reactor  
A control rod for a nuclear reactor is composed of a center structural member, a plurality of wings each composed of a sheath member of long plate structure having a U-shaped cross section and...
6205196 Boiling water type nuclear reactor core and operation method thereof  
A boiling water type nuclear reactor core, in which a plurality of fuel assemblies, each enclosed in a channel box, are loaded and a plurality of control rods, each having control blades, are...
6198786 Methods of reactor system pressure control by reactor core power modulation  
A method of controlling the system pressure in a power generating system, having a turbine-generator and a BWR, that modulates the core thermal power of the reactor while maintaining the main...
6118837 Method for detecting the dropping of a control element  
A method for detecting the dropping of at least one control element in a reactor core of a power station by delaying signals output by detectors disposed along a fall path of the control element in...
5898744 Apparatus and method for clock recovery in a communication system  
A method for recovering the clock in an ADSL (asymmetric digital subscriber line) communication system at the receiver to match the frequency of the transmitted signal. A digital phase locked loop...
5787136 Wear resisting sintered alloy and its production, and control rod driving apparatus and nuclear reactor using the same  
A wear resistant material containing no cobalt is used for a sliding portion of a control rod driving mechanism of a nuclear plant for reducing the exposure dose due to elution of cobalt and...
5642389 Light water reactor in particular a boiling water reactor with a high degree of inherent safety  
A light water reactor, in particular a boiling water reactor, includes a reactor pressure vessel having an interior, a core disposed in a lower half of the pressure vessel, fuel assemblies disposed...
5581587 Control rod driving apparatus  
A control rod driving apparatus adapted to drive a control rod assembly for a nuclear reactor is disposed in a housing mounted to a reactor pressure vessel of the nuclear reactor and includes a...
5333156 Nuclear fuel assembly with an integrated passive safety device  
Certain of the nuclear fuel assemblies contained in a fast neutron nuclear reactor core have an integrated passive safety device. More specifically, said device is constituted by an annular block...
5330589 Hafnium alloys as neutron absorbers  
A hafnium alloy consisting essentially of hafnium and containing Sn by 0.1-1.5 weight %, O by 0.03-0.2 weight %, Fe by 0.01-0.15 weight %, Zr by 0.02-2.0 weight %, and (1) Cr by 0.01-0.15 weight %,...
5323435 Control rod housing support bars with wing assemblies  
A boiling water reactor control rod drive housing support bars having wing assemblies to limit the travel of a control rod in the event that a control rod housing is ruptured. The wing assemblies...
5291530 Enriched boron-10 boric acid control system for a nuclear reactor plant  
A nuclear reactor plant is provided in which the reactor coolant system contains a dissolved solution of enriched boric acid. The boron-10 to boron-11 atomic isotope ratio of the enriched boric...
5272733 Control rod driving system  
A control rod driving hydraulic system of a control rod driving system of a nuclear power plant, in utilization of condensate as a control rod driving water comprises a water pressure control unit...
5232655 Nuclear fuel assembly skeleton  
A nuclear fuel assembly comprises a skeleton that constitutes the structure of the assembly and that holds a bundle of fuel elements at nodes in a regular array. The skeleton comprises two end...
5232656 Fast-acting nuclear reactor control device  
A fast-acting nuclear reactor control device for moving and positioning a fety control rod to desired positions within the core of the reactor between a run position in which the safety control rod...
5213756 Boiling water reactor with expanded core diameter  
An expanded reactor core capacity is achieved within the constraints imposed by the diametric extent of the current advanced boiling reactor (ABWR). This enhanced core capacity is achieved through...
5207975 Hydraulic control rod driving system  
According to the present invention, there is provided a hydraulic control rod driving system in which radial clearance is formed between a piston portion and a cylinder, one or two or more step...
5185120 Liquid affected spectral shift reactor  
A method for affecting neutron spectral shift in a reactor core includes providing a liquid poison in a hollow control blade extending into the core, displacing the liquid poison with a first fluid...
5139735 Reactivity control system  
A reactivity control system includes a reservoir containing a liquid nuclear poison, at least one stationary, hollow control blade extending vertically into a reactor core, and a poison conduit...
5130078 Reactivity control system and method  
A method and system for controlling nuclear reactivity in a nuclear reactor are disclosed. The method includes maintaining a nuclear position solution at an initial poison pressure less than the...
5128093 Control rod drive hydraulic system  
A hydraulic system for a control rod drive (CRD) includes a variable output-pressure CR pump operable in a charging mode for providing pressurized fluid at a charging pressure, and in a normal mode...
5082618 Method and device for modifying the concentration of the soluble poison contained in the cooling fluid of the primary circuit of a nuclear reactor  
The method consists in removing the cooling fluid of the primary circuit, and, as a function of the cooling fluid concentration, in passing either all of the cooling fluid into at least one...
5039473 Method of determining and evaluating the power return capacity of a pressurized water nuclear reactor  
Method for determining a evaluating the capacity of a pressurized water nuclear reactor to return to power rapidly, consisting in calculating a pick-up power by applying the general formula: ...
5023044 Nuclear reactor control assembly  
An assembly for controlling the release of neutrons in a nuclear reactor having the core split into two halves. A disk assembly formed from at least two circular disks is positioned substantially...
4983350 Method and apparatus for detecting the fall of a control cluster in a nuclear reactor  
The present invention seeks to obtain reliable detection of the fall of a control cluster into the core of a pressurized water nuclear reactor without giving rise to the risk of an erroneous...
4975238 Control system for a nuclear steam power plant  
A control system for a nuclear steam power plant having a reactor, one or more once through steam generators and a turbine includes a reactor control subsystem responsive to a power demand input to...
4844856 Process for automatic regulation of the soluble boron content of the cooling water of a pressurized water nuclear reactor  
A process for automatic regulation of the soluble boron content of the cooling water of a pressurized water nuclear reactor in which operating regions (2, 3) of the means of boration and of the...
4842805 Method of detecting that an anti-reactive element has fallen into the reactor of a nuclear power station, and a power station protected against such a fall  
The invention improves detecting that a control cluster has fallen into the reactor of a nuclear fission power station. Variations are monitored firstly in the nuclear power (3) and secondly in at...
4789519 Nuclear reactor plant  
In a nuclear reactor installation with a small high temperature reactor (26) all of the components of the primary loop, together with the control and shutdown installations (82, 92, 114, 116; 194,...
4781881 Apparatus and method for closed-loop control of reactor power in minimum time  
Closed-loop control law for altering the power level of nuclear reactors in a safe manner and without overshoot and in minimum time. Apparatus is provided for moving a fast-acting control element...
4777010 Rod drive control system for nuclear reactors  
A rod drive control system for nuclear such as boiling water reactors is comprised of a plurality of stepping motors for inserting and withdrawing control rods disposed within the nuclear reactor,...
4708843 Control unit for a nuclear reactor  
A control unit for a nuclear reactor constituted by a plurality of sealed vessels (17) communicating with the inside of the tank of the reactor (15) which they extend upwards above its cover (16);...
4694693 Check valve test method using truncated accumulator blowdown  
A method for testing a normally closed check valve connected in series with an isolation valve at the outlet of a passive injection system includes adjusting pressure upstream and downstream of the...
4666654 Boiling water neutronic reactor incorporating a process inherent safety design  
A boiling-water reactor core is positioned within a prestressed concrete reactor vessel of a size which will hold a supply of coolant water sufficient to submerge and cool the reactor core by...
4664871 Nuclear power installation with a high temperature pebble bed reactor  
Disclosed is a nuclear power plant comprising a high-temperature pebble bed reactor contained in a cylindrical steel pressure vessel in which an upper part of the cylindrical steel pressure vessel,...
4647421 Operation control method for nuclear reactor  
An operation control method for a nuclear reactor performing a load follow-up operation in accordance with a load variation program, wherein a core reactivity which changes with time in a first...
4627955 Process for detecting the variations in the reactivity of the core of a pressurized water nuclear reactor and device for making use of this process  
Process and device for the detection of the variations, due to a fault in the position of the core control clusters, in the reactivity of the core of a reactor. A momentary value (6) representing...
4627954 Process for detecting faults in the power distribution of a pressurized water nuclear reactor core and device for making use of this process  
Process and device for the detecting of faults in the distribution of the power of the core (2) of a pressurized water nuclear reactor, in which at least one parameter representing the power of the...
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