Kraftwerk Union Aktiengesellschaft

Siemens Aktiengesellschaft

Framatome Anp Gmbh

Anwer Puthawala

Dietmar Bege

Hans-Peter Schabert

Werner Hild

Erich Strickroth

Klaus Kuhnke

Wolfgang Kluger

Hermann Emmert

Othmar Meichsner

Helmut Stünkel

Erich Marr

Manfred Meintker

Gunter Wittrowsky

Hans-Joachim Faust

Peter Schönfeld

Lutz Hoffmann

Hans-Erich John

Helmut Stu/ Nkel

A nuclear power station includes a feedwater/steam circuit having a condensate-purification device and a feedwater pump connected upstream of a reactor pressure vessel. A branch line has a gas-injection device for introducing hydrogen into a coolant to ensure especially low maintenance and repair costs of the gas-injection device and an especially homogeneous distribution of hydrogen produced in the gas-injection device. The branch line branches off from the feedwater/steam circuit directly downstream of the condensate-purification device and discharges into the feedwater/steam circuit directly upstream of the feedwater pump.

Nuclear power station having a gas-injection device for a coolant

An apparatus admits gas into the primary coolant of a pressurized water nuclear reactor having a coolant loop for a liquid coolant, in particular water, to which hydrogen is to be added. The coolant loop preferably includes a volume control tank for the coolant as well as at least one high-pressure pump which admits coolant that has been extracted from the coolant loop back into the coolant loop again. An admission point for the hydrogen is located in a suction line on the suction side of the high-pressure pump. A measurement line on the pressure side of the high-pressure pump communicates with the volume control tank or with a dewatering system. A device for measuring the hydrogen content in the coolant is incorporated into the measurement line. The measuring device is connected through a control device to a control valve, with which the delivery of hydrogen to the admission point can be controlled. The gas admission apparatus assures a definite, precisely maintained hydrogen content in the coolant.

Apparatus for admitting gas into the primary coolant of a pressurized water reactor

A system is for supplying a generator with hydrogen, in particular a generator of a power generating plant. The system offers a high level of safety while at the same time making handling easy. The system includes a closed system cycle for carrying water and/or gas and a hydrogen feed line, branching off from the system cycle, for the generator. The system cycle includes an electrolysis unit designed as a membrane electrolyzer.

System for supplying a generator with hydrogen

A conditioning system for reducing an oxygen content of water carried in a subsystem of an industrial plant includes an electrolysis unit having a hydrogen side, an anode, and a cathode. The anode and cathode are connected to the subsystem to decompose water into hydrogen and oxygen. A hydrogen/oxygen recombination catalyst is connected to the subsystem. The hydrogen/oxygen recombination catalyst follows the anode and cathode on the hydrogen side. A method for lag reducing an oxygen content of water carried in a subsystem of an industrial plant, includes the steps of electrolytically decomposing water from a subsystem of an industrial plant into hydrogen and oxygen, and using the hydrogen generated at the same time for recombining the oxygen contained in the water.

Conditioning system and method for reducing the oxygen content of water carried in a subsystem of an industrial plant

An electrolysis apparatus has a number of membrane electrolysis cells. Each of the cells has a membrane formed on both sides with a contact layer. The apparatus, while it is compact in its design, is also suitable for comparatively high hydrogen production rates and can consequently be used particularly flexibly. A contact plate is respectively arranged on each contact layer. Each of the contact plates is formed, on its surface facing the contact layer assigned to it, with a system of ducts for the transport of water and/or gas.

Electrolysis apparatus

A device for gasifying water conducted in a subsystem of a technical installation with hydrogen includes an electrolysis unit connected in the subsystem for decomposing some of the water conducted therein into hydrogen and oxygen, and a dissipation system connected to the electrolysis unit for dissipating oxygen received therefrom.

Gasification device

Solidifying radioactive liquid concentrate residues containing borates by embedding in a binder by mixing. Prior to embedding, sodium hydroxide is added to the waste concentrate to obtain a mole ratio of sodium to boron of 0.25 with a corresponding pH value in the range of 7.3 to 8.0 or 0.7 with a corresponding pH value of 9.8 to 10.2. The waste concentrate with added sodium hydroxide is mixed with a binder to embed it into the binder.

Method for solidifying boron-containing radioactive residues

Method for the ultimate disposition of radioactive wastes by vitrification, in which weak to medium radioactive waste concentrates from borate-containing radioactive liquids are mixed with added glass-forming materials, maximally in a ratio of 1:3, and the mixture heated to obtain a glass-forming melt.

Method for ultimate disposition of borate containing radioactive wastes

Mixing devices such as worm machines used for embedding radioactive wastes in hot bitumen are cleaned to remove residual bitumen and salt incrustations in three successive operations: (a) Washing with a solvent for bitumen in a volume amount equal to about the free space of the device. (b) Rinsing with a water-soluble rinsing medium miscible with the solvent in a volume amount the same as (a). (c) Rinsing with demineralized water in a volume amount twice (b). Pumice gravel is used to absorb the solvent and rinsing medium and the resultant pumice embedded in bitumen and sent to ultimate storage.

Method for cleaning mixing devices

Liquid-containing radioactive wastes are bound into thermoplastic material by introducing particles of thermoplastic material at a non-sticking temperature into a kneading machine, heating the thermoplastic material in the absence of radioactive wastes to at least 100.degree. C., adding the liquid-containing wastes to the heated thermoplastic material, mixing and concurrently increasing the temperature of the mixture to a temperature of about 200.degree. C. or more to vaporize liquid in the mixture, maintaining the mixture at a vaporization temperature to dry to the mixture, releasing evolved vapors and discharging the dried mixture from the kneading machine. Difficulties due to clogging of the kneading machine and fluctuations in the consistency of the dried end product are minimized.

Method for binding liquid-containing radioactive wastes and kneading

Method of removing radiant, pulverulent synthetic wastes which are mixed dry with a thermoplastic mass in a kneader and then delivered from a discharge opening of the kneader into a container capable of providing a final storage therefor, while gases and/or vapors are withdrawn from degassing domes of the kneader, which includes delivering fluidic dried wastes by mechanical movement through a metering tube into a degassing dome in the kneader disposed next to the discharge opening, and admitting scavenging gas into the metering tube at least temporarily in direction toward the kneader; and device for carrying out the foregoing method.

Method and apparatus for embedding radioactive pulverulent organic waste

Worm extruder assembly includes an extruder worm, a steam dome formed as a cylindrical tube disposed transversely to the worm axis, a condenser surrounding the cylindrical tube, a steam outlet line extending from the steam dome to the condenser, and means defining an annular gap connecting the condenser to the cylindrical tube.

Worm extruder assembly

Method and apparatus for encapsulating radioactive plastic wastes, particularly radioactively contaminated ion exchange filter material containing water, in bituminous solidification substances, by drying the radioactive waste separate and apart from the bituminous substance, introducing regulated amounts of dry radioactive waste into the bituminous substance and kneading the mixture at a temperature of 120.degree. C. or lower to encapsulate the dry radioactive waste by the mechanical action of the kneading, and pouring the kneaded, encapsulated radioactive plastic waste into a container. Undesired decomposition with discharge of pollutants into the atmosphere are avoided.

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Buckenhof, Germany

Anwer Puthawala