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8891723 Stable startup system for a nuclear reactor  
A nuclear reactor module includes a reactor vessel containing coolant, a reactor core submerged in the coolant, and a heat exchanger configured to remove heat from the coolant. The nuclear reactor...
8625733 Neutron source assembly  
A neutron source rodlet assembly having a separate source capsule assembly that is not encapsulated within the neutron source rodlet assembly. The neutron source rodlet assembly is made up, at...
8526562 Reactor power control apparatus of natural circulation reactor, generation system of natural circulation reactor and method for controlling reactor power of natural circulation reactor  
In the present invention, a reactor power control apparatus of a natural circulation reactor comprises a power control apparatus for controlling reactor power and a pressure control apparatus for...
7945011 Enhanced steam dump (bypass) control system  
The present invention relates to a method of controlling a nuclear reactor during a transient period. The method includes actuating the steam dump system in response to a temperature error signal...
7876872 Reactor power control apparatus of natural circulation reactor and method for controlling reactor power of natural circulation reactor  
In the present invention, a reactor power control apparatus of a natural circulation reactor comprises a reactor pressure vessel which circulates cooling water using the density difference of the...
7742555 Enhanced steam dump (bypass) control system  
The present invention relates to a method of controlling a nuclear reactor during a transient period. The method includes actuating the steam dump system in response to a temperature error signal...
7532698 Systems and methods of predicting a critical effective k for a nuclear reactor  
Systems and methods for a method for determining a critical effective k at an off-rated core state of a nuclear power plant includes determining, for the off-rated core state a control rod...
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...
6687323 Method for starting up and monitoring an apparatus for controlling a boiling water nuclear reactor  
A safe start-up of a boiling water reactor is achieved when two conditions are adhered to and monitored when the control rods are being moved out of the core: First, the drive of a control rod...
6608878 Method and device for monitoring the power rise during startup of a nuclear reactor (diversitary excursion monitoring)  
A method and a device are provided for monitoring a power rise during startup of a nuclear reactor (diversitary excursion monitoring). In order to be able to shut down the reactor during startup...
6181759 Method and apparatus for determining nearness to criticality of a nuclear fueled electric power generating unit  
A method is provided for determining the closeness to criticality of a nuclear reactor during start-up, comprising the steps of completing a control rod withdrawal step, thereby generating a...
5491731 Method and system for maintaining pressure in a nuclear power plant primary loop during startup or shutdown  
An automated method for maintaining pressure within a nuclear power plant primary loop during either startup or shutdown, the method comprises the steps of partially filling a portion of a...
5271044 Boiling water nuclear reactor and start-up process thereof  
In a boiling water nuclear reactor, a reactor primary cooling water line is filled with water at the start-up time, and the inside of a pressure vessel is pressurized by a pressurized tank and at...
5019322 Gas cooled nuclear reactor with a pebble bed of spherical operating elements  
A gas cooled nuclear reactor may have a stationary pile of spherical operating elements. The reactor may be controlled and shut down by absorber rods displaceable in channels of the side...
4949363 Bottom supported liquid metal nuclear reactor  
A liquid metal nuclear reactor has a sodium tank, having a closed arcuate bottom and upstanding cylindrical wall for containing a reactor core in a pool of liquid metal coolant, which is disposed...
4800952 Thaw flow control for liquid heat transport systems  
In a liquid metal heat transport system including a source of thaw heat for use in a space reactor power system, the thaw flow throttle or control comprises a fluid passage having forward and...
4783306 Method and device for passive transfer of heat from nuclear reactors to a public utility network, with automatic regulation of reactor power and automatic emergency shutdown and switchover to emergency cooling  
A pressurized water nuclear reactor has a reactor vessel arranged in a pool, which is filled with a neutron absorbing liquid, for example borated water. The reactor vessel is closed except for...
4734249 Nuclear reactor start-up method  
A nuclear reactor start-up method of starting up a boiling water reactor which is in the cold shut-down state. The method includes setting a subcooled temperature of a coolant in a reactor core...
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...
4695423 Method for loading, operating, and unloading a ball-bed nuclear reactor  
A ball-bed (pebble-bed) nuclear reactor, instead of having fuel elements e or less continuously withdrawn and new or reconstituted fuel elements more or less continuously reintroducted, is...
4678618 Individual source positioning mechanism for a nuclear reactor fuel assembly  
A secondary source positioning mechanism for a fuel assembly in a nuclear reactor locates an individual one of the secondary sources in a respective guide thimble of the fuel assembly aligned with...
4674285 Start-up control system and vessel for LMFBR  
A reflux condensing start-up system comprises a steam generator, a start-up vessel connected parallel to the steam generator, a main steam line connecting steam outlets of the steam generator and...
4656335 Start-up control system and vessel for LMFBR  
A reflux condensing start-up system includes a steam generator, a start-up vessel connected parallel to the steam generator, a main steam line connecting steam outlets of the steam generator and...
4608224 Nuclear reactor cooled by a liquid metal  
Nuclear reactor cooled by a liquid metal comprising a main vessel sealed by a sealing slab, said vessel containing liquid metal overhung by a covering of inert gas, the reactor core being placed...
4588547 Method and apparatus for determining the nearness to criticality of a nuclear reactor  
The approach to criticality of a nuclear reactor provided with an artificial neutron source is monitored by two neutron detectors, one which measures the neutron flux in a localized region around...
4563746 Method of operating power plants  
This invention refers to a plant operating method for overcoming an abnormal status of a plant. A plant data is detected from the plant, and all plant state members indicating an abnormality of...
4533514 Nuclear reactor degassing method and degassing system  
Control rods are inserted into the core of a nuclear reactor in operation to shut down the reactor output. Before completion of entire control rod insertion, a high-temperature coolant flowing in...
4400343 System and method for controlling operation of boiling water reactor  
The pressure PR in the reactor pressure vessel, the flow rate Wc of the cooling water flowing through the core in the reactor pressure vessel, and the flow rate WSTM of the steam supplied from the...
4359627 Preheater mounted within a well  
A preheater is disclosed which can be inserted and withdrawn from a well tube defining a curved passage, without having its heating element damaged, by utilizing the flexibility of a spirally...
4343682 Plant having feed water heating means for nuclear units during plant start up and method of operating the same  
A plant having feed water heating means for heating feed water supplied to a nuclear steam supply unit during plant start up and/or shutdown. High pressure heaters are positioned in a feed water...
4293382 Method of starting up a nuclear reactor  
At the time of starting up a nuclear reactor, the concentration of oxidizing substance in a cooling water in a reactor pressure vessel is decreased by evacuating the pressure vessel or replacing...
4160956 Nuclear-pumped uranyl salt laser  
A direct nuclear radiation pumped laser consisting essentially of a uranyl salt with a UO2++ uranyl ion enriched in the U235 isotope sufficient to sustain a fission chain reaction, the uranyl ion...
4153506 Method of starting operation of a nuclear reactor  
A method of starting operation of a nuclear reactor which contains fresh fuel rods comprising increasing a fuel power P(Kw/ft) produced by the fresh fuel rods to an amount determined by the...
4104117 Nuclear reactor power generation  
The feedwater of a nuclear reactor at low-power levels, particularly during start-up, is controlled by combining an error signal component dependent on the departure of the actual level in the...
4093514 Method of bringing nuclear power plant to fractional electrical load conditions  
A method of bringing a nuclear power plant to fractional electric load conditions, which power plant comprises at least two nuclear reactors, at least one nuclear reactor being a breeder and both...
4087985 Apparatus and method for thermal power generation  
An improved thermal power plant and method of power generation which minimizes thermal stress and chemical impurity buildup in the vaporizing component, particularly beneficial under loss of...
4077836 Apparatus for automatically starting up nuclear reactor  
An apparatus for automatically starting up a nuclear reactor, which causes control rods in the reactor to be withdrawn in the predetermined order according to the signal obtained by adding the...
3974029 Nuclear reactors with auxiliary boiler circuit  
A gas-cooled nuclear reactor has a main circulatory system for the gaseous coolant incorporating one or more main energy converting units, such as gas turbines, and an auxiliary circulatory system...
3734823 NUCLEAR REACTOR LOOP REACTIVATION SYSTEM  
A method and means for protecting a nuclear reactor against rapid insertion of reactivity upon the reactivation of an isolated hoop. A temperature interlock, a flow mixing line and a time sequence...
3700554 SPACE REACTOR GROUND SAFETY AND CONTROL SYSTEM  
3677326 METHOD OF REDUCING REACTION BETWEEN ADJACENT LAYERS OF LIQUID SUBSTANCES HAVING DIFFERENT DENSITIES  
A hollow pipe whose walls are formed of concentric cylinders of different substances may serve as a container for or as a furnace generating high temperatures on the order of 3,000° K. The...
3576180 STARTUP DEVICE FOR FLOW-THROUGH STEAM GENERATOR  
Device for starting up and restarting a reactor-heated flow-through steam generator and having a relatively constantly inclined tube system traversible by feedwater in upward direction in...
3535562 POWER SYSTEM WITH HEAT PIPE LIQUID COOLANT LINES  
3523869 BOOSTER-SOURCE RODS IN HEAVY WATER MODERATED REACTOR  
3434926 INDIRECT-CYCLE INTEGRAL STEAM COOLED NUCLEAR REACTOR  
3424653 METHOD FOR START-UP OF A NUCLEAR REACTOR UTILIZING A DIGITAL COMPUTER  
3368979 Nuclear fuel composition for multiplication determination in reactors and driving subcritical lattices  
3366545 Method of operating a plurality of reactors  
1,066,010. Controlling reactors. ATOMIC ENERGY OF CANADA Ltd. Dec. 30, 1965 [Feb. 24, 1964], No. 55237/65. Heading G6C. In a nuclear reactor, several separate cores are provided, one of which may...
3366544 Method of and apparatus for controlling start-up of a nuclear reactor  
1,102,824. Controlling reactors. UNITED STATES ATOMIC ENERGY COMMISSION. 23 May, 1966 [13 July, 1965], No. 22907/66. Heading G6C. The initial starting control of a nuclear reactor is effected...
3360477 Neutron source  

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