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Alzenau in Unterfranken, Germany

Eichhorn H.,NUKEM Technologies GmbH
ATW - Internationale Zeitschrift fur Kernenergie | Year: 2011

After an international tendering process NUKEM was awarded to build the Industrial Complex for Solid Radwaste Management (ICSRM) at the Chernobyl Nuclear Power Plant. The ICSRM project is one component of an integrated radioactive waste management programme for the entire Chernobyl Nuclear Power Plant (ChNPP). The Project includes radioactive waste retrieval, processing and packaging for interim storage or final disposal. Waste management operations performed as part of the ICSRM Project include the following: Waste volume reduction through compaction and incineration. Waste solidification through immobilization in concrete, also known as grouting. The immobilization material provides good resistance to external factors, such as water and weather. Also, grouting creates a monolith with few voids, thus ensuring the integrity of the waste form. NUKEM is the first western company who has successfully accomplished a radwaste treatment plant within the ChNPP site. NUKEM has received all payments from the EC due to the final acceptance of the facilities. In addition to the main contract NUKEM has successfully accomplished a contract regarding the ventilation system of LOT 0. Based on the ICSRM success NUKEM is currently executing other projects in Ukraine and is involved in several tenders.

Scheffler B.,NUKEM Technologies GmbH
ATW - Internationale Zeitschrift fur Kernenergie | Year: 2011

Management of radioactive waste, handling spent fuel elements, decommissioning of nuclear facilities, and engineering and consulting activities are services associated with the name of NUKEM all over the world. The company's scientists and engineers develop solution concepts combining the latest technologies with proven techniques and many years of experience. The company's history and the services offered to the nuclear industry began more than 5 decades ago. The predecessor, NUKEM Nuklear-Chemie-Metallurgie, was founded in 1960 as one of the earliest nuclear companies in Germany. Originally, the firm produced fuel elements for a variety of reactor lines. As early as in the 1970s, logical extensions of these business activities were nuclear engineering and plant construction. In the meantime, NUKEM Technologies GmbH has developed a worldwide reputation for its activities. Numerous reference projects bear witness to optimum project management and customer satisfaction. Since 2009, NUKEM Technologies has been a wholly owned subsidiary of the Russian Atomstroyexport. NUKEM Technologies operates sales and project offices outside Germany, e.g. in Russia, China, Lithuania, France, and Bulgaria. In this way, the company is present in its target markets of Russia, Western and Eastern Europe as well as Asia, offering customers and partners fast and direct contacts.

There has been a change of mind with respect to waste management among power plant operators in Russia and planners of the new WER reactor line. Solid waste no longer is to be stored on the site of the power plant; instead, a functioning direct method of treatment of the different categories of waste arising in operation is favored. Waste conditioning and reduced storage volumes are indispensable arguments in selling reactor technology to markets outside Russia. Reference often is made to the internationally discussed volume of 50 m3 of waste per reactor unit and year, which is then defined as a target. NUKEM Technologies verified existing technical concepts and worked out proposals of improved waste management. One project proposal accepted by ASE (Atomstroyexport) was elaborated to the Technical Project (corresponding to Basic Design) status. Specific management of materials flows, the use of processes tailored to the waste stream, and adaptation of the throughputs of these plants to the waste arisings actually expected are able to reduce clearly both the volume of conditioned waste to be stored and the capital costs.

Brahler G.,NUKEM Technologies GmbH | Hartung M.,NUKEM Technologies GmbH | Fachinger J.,FNAG Furnaces Nuclear Applications Grenoble S.A.S. | Grosse K.-H.,FNAG Furnaces Nuclear Applications Grenoble S.A.S. | Seemann R.,ALD Vacuum Technologies GmbH
Nuclear Engineering and Design | Year: 2012

The application of High Temperature Reactor (HTR) Technology in the course of the continuously increasing world wide demand on energy is taken more and more under serious consideration in the power supply strategy of various countries. Especially for the emerging nations the HTR Technology has become of special interest because of its inherent safety feature and due to the alternative possibilities of applications, e.g. in the production of liquid hydrocarbons or the alternative application in H 2 generation. The HTR fuel in its various forms (spheres or prismatic fuel blocks) is based on small fuel kernels of about 500 μm in diameter. Each of these uranium oxide or carbide kernels are coated with several layers of pyrocarbon (PyC) as well as an additional silicon carbide (SiC) layer. While the inner pyrocarbon layer is porous and capable to absorb gaseous fission products, the dense outer PyC layer forms the barrier against fission product release. The SiC layer improves the mechanical strengths of this barrier and considerably increases the retention capacity for solid fission products that tent to diffuse at these temperatures. Especially the high quality German LEU TRISO spherical fuel based on the NUKEM design, has demonstrated the best fission product release rate, particular at high temperatures. The ∼10% enriched uranium triple-coated particles are embedded in a moulded graphite sphere. A fuel sphere consists of approximately 9 g of uranium (some 15,000 particles) and has a diameter of 60 mm. As the unique safety features, especially the inherent safety of the HTR is based on the fuel design, this paper shall reflect the complexity but also developments and economical aspects of the fabrication processes for HTR fuel elements. © 2011 Elsevier B.V.

Today, designers of new WER reactors as well as companies operating Russian NPP favour direct methods of waste management for treating wastes of different categories generated during plant operation. The objective is to achieve the amount of 50 m 3 of conditioned waste per one reactor unit per year, which is currently being discussed internationally. NUKEM Technologies has reviewed the existing waste management concepts and proposed improved waste management technologies. The first step was to identify the waste prevention policies. The waste management concept focuses on subjecting different liquid wastes to different treatment methods. Another objective was to minimise the organic content in conditioned waste. The treatment methods for solid radioactive waste include high force compaction and incineration. The new concept also features a tracking system which is used for classifying the incoming waste and ensuring its traceable documentation at different stages throughout the entire treatment process. Additionally, each waste package prepared for final storage is monitored before it leaves the treatment building and provided with an individual certificate containing all data about the treated waste including its radiological characteristics and the place of storage.

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